Remove windows python distribution from repo and add requirements.txt

17 files changed, 0 insertions, 7405 deletions

diff --git a/python/click/__init__.py b/python/click/__init__.py
deleted file mode 100644
index d3c3366..0000000
--- a/python/click/__init__.py
+++ /dev/null
@@ -1,97 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-click
-~~~~~
-
-Click is a simple Python module inspired by the stdlib optparse to make
-writing command line scripts fun. Unlike other modules, it's based
-around a simple API that does not come with too much magic and is
-composable.
-
-:copyright: © 2014 by the Pallets team.
-:license: BSD, see LICENSE.rst for more details.
-"""
-
-# Core classes
-from .core import Context, BaseCommand, Command, MultiCommand, Group, \
-     CommandCollection, Parameter, Option, Argument
-
-# Globals
-from .globals import get_current_context
-
-# Decorators
-from .decorators import pass_context, pass_obj, make_pass_decorator, \
-     command, group, argument, option, confirmation_option, \
-     password_option, version_option, help_option
-
-# Types
-from .types import ParamType, File, Path, Choice, IntRange, Tuple, \
-     DateTime, STRING, INT, FLOAT, BOOL, UUID, UNPROCESSED, FloatRange
-
-# Utilities
-from .utils import echo, get_binary_stream, get_text_stream, open_file, \
-     format_filename, get_app_dir, get_os_args
-
-# Terminal functions
-from .termui import prompt, confirm, get_terminal_size, echo_via_pager, \
-     progressbar, clear, style, unstyle, secho, edit, launch, getchar, \
-     pause
-
-# Exceptions
-from .exceptions import ClickException, UsageError, BadParameter, \
-     FileError, Abort, NoSuchOption, BadOptionUsage, BadArgumentUsage, \
-     MissingParameter
-
-# Formatting
-from .formatting import HelpFormatter, wrap_text
-
-# Parsing
-from .parser import OptionParser
-
-
-__all__ = [
-    # Core classes
-    'Context', 'BaseCommand', 'Command', 'MultiCommand', 'Group',
-    'CommandCollection', 'Parameter', 'Option', 'Argument',
-
-    # Globals
-    'get_current_context',
-
-    # Decorators
-    'pass_context', 'pass_obj', 'make_pass_decorator', 'command', 'group',
-    'argument', 'option', 'confirmation_option', 'password_option',
-    'version_option', 'help_option',
-
-    # Types
-    'ParamType', 'File', 'Path', 'Choice', 'IntRange', 'Tuple',
-    'DateTime', 'STRING', 'INT', 'FLOAT', 'BOOL', 'UUID', 'UNPROCESSED',
-    'FloatRange',
-
-    # Utilities
-    'echo', 'get_binary_stream', 'get_text_stream', 'open_file',
-    'format_filename', 'get_app_dir', 'get_os_args',
-
-    # Terminal functions
-    'prompt', 'confirm', 'get_terminal_size', 'echo_via_pager',
-    'progressbar', 'clear', 'style', 'unstyle', 'secho', 'edit', 'launch',
-    'getchar', 'pause',
-
-    # Exceptions
-    'ClickException', 'UsageError', 'BadParameter', 'FileError',
-    'Abort', 'NoSuchOption', 'BadOptionUsage', 'BadArgumentUsage',
-    'MissingParameter',
-
-    # Formatting
-    'HelpFormatter', 'wrap_text',
-
-    # Parsing
-    'OptionParser',
-]
-
-
-# Controls if click should emit the warning about the use of unicode
-# literals.
-disable_unicode_literals_warning = False
-
-
-__version__ = '7.0'
diff --git a/python/click/_bashcomplete.py b/python/click/_bashcomplete.py
deleted file mode 100644
index a5f1084..0000000
--- a/python/click/_bashcomplete.py
+++ /dev/null
@@ -1,293 +0,0 @@
-import copy
-import os
-import re
-
-from .utils import echo
-from .parser import split_arg_string
-from .core import MultiCommand, Option, Argument
-from .types import Choice
-
-try:
-    from collections import abc
-except ImportError:
-    import collections as abc
-
-WORDBREAK = '='
-
-# Note, only BASH version 4.4 and later have the nosort option.
-COMPLETION_SCRIPT_BASH = '''
-%(complete_func)s() {
-    local IFS=$'\n'
-    COMPREPLY=( $( env COMP_WORDS="${COMP_WORDS[*]}" \\
-                   COMP_CWORD=$COMP_CWORD \\
-                   %(autocomplete_var)s=complete $1 ) )
-    return 0
-}
-
-%(complete_func)setup() {
-    local COMPLETION_OPTIONS=""
-    local BASH_VERSION_ARR=(${BASH_VERSION//./ })
-    # Only BASH version 4.4 and later have the nosort option.
-    if [ ${BASH_VERSION_ARR[0]} -gt 4 ] || ([ ${BASH_VERSION_ARR[0]} -eq 4 ] && [ ${BASH_VERSION_ARR[1]} -ge 4 ]); then
-        COMPLETION_OPTIONS="-o nosort"
-    fi
-
-    complete $COMPLETION_OPTIONS -F %(complete_func)s %(script_names)s
-}
-
-%(complete_func)setup
-'''
-
-COMPLETION_SCRIPT_ZSH = '''
-%(complete_func)s() {
-    local -a completions
-    local -a completions_with_descriptions
-    local -a response
-    response=("${(@f)$( env COMP_WORDS=\"${words[*]}\" \\
-                        COMP_CWORD=$((CURRENT-1)) \\
-                        %(autocomplete_var)s=\"complete_zsh\" \\
-                        %(script_names)s )}")
-
-    for key descr in ${(kv)response}; do
-      if [[ "$descr" == "_" ]]; then
-          completions+=("$key")
-      else
-          completions_with_descriptions+=("$key":"$descr")
-      fi
-    done
-
-    if [ -n "$completions_with_descriptions" ]; then
-        _describe -V unsorted completions_with_descriptions -U -Q
-    fi
-
-    if [ -n "$completions" ]; then
-        compadd -U -V unsorted -Q -a completions
-    fi
-    compstate[insert]="automenu"
-}
-
-compdef %(complete_func)s %(script_names)s
-'''
-
-_invalid_ident_char_re = re.compile(r'[^a-zA-Z0-9_]')
-
-
-def get_completion_script(prog_name, complete_var, shell):
-    cf_name = _invalid_ident_char_re.sub('', prog_name.replace('-', '_'))
-    script = COMPLETION_SCRIPT_ZSH if shell == 'zsh' else COMPLETION_SCRIPT_BASH
-    return (script % {
-        'complete_func': '_%s_completion' % cf_name,
-        'script_names': prog_name,
-        'autocomplete_var': complete_var,
-    }).strip() + ';'
-
-
-def resolve_ctx(cli, prog_name, args):
-    """
-    Parse into a hierarchy of contexts. Contexts are connected through the parent variable.
-    :param cli: command definition
-    :param prog_name: the program that is running
-    :param args: full list of args
-    :return: the final context/command parsed
-    """
-    ctx = cli.make_context(prog_name, args, resilient_parsing=True)
-    args = ctx.protected_args + ctx.args
-    while args:
-        if isinstance(ctx.command, MultiCommand):
-            if not ctx.command.chain:
-                cmd_name, cmd, args = ctx.command.resolve_command(ctx, args)
-                if cmd is None:
-                    return ctx
-                ctx = cmd.make_context(cmd_name, args, parent=ctx,
-                                       resilient_parsing=True)
-                args = ctx.protected_args + ctx.args
-            else:
-                # Walk chained subcommand contexts saving the last one.
-                while args:
-                    cmd_name, cmd, args = ctx.command.resolve_command(ctx, args)
-                    if cmd is None:
-                        return ctx
-                    sub_ctx = cmd.make_context(cmd_name, args, parent=ctx,
-                                               allow_extra_args=True,
-                                               allow_interspersed_args=False,
-                                               resilient_parsing=True)
-                    args = sub_ctx.args
-                ctx = sub_ctx
-                args = sub_ctx.protected_args + sub_ctx.args
-        else:
-            break
-    return ctx
-
-
-def start_of_option(param_str):
-    """
-    :param param_str: param_str to check
-    :return: whether or not this is the start of an option declaration (i.e. starts "-" or "--")
-    """
-    return param_str and param_str[:1] == '-'
-
-
-def is_incomplete_option(all_args, cmd_param):
-    """
-    :param all_args: the full original list of args supplied
-    :param cmd_param: the current command paramter
-    :return: whether or not the last option declaration (i.e. starts "-" or "--") is incomplete and
-    corresponds to this cmd_param. In other words whether this cmd_param option can still accept
-    values
-    """
-    if not isinstance(cmd_param, Option):
-        return False
-    if cmd_param.is_flag:
-        return False
-    last_option = None
-    for index, arg_str in enumerate(reversed([arg for arg in all_args if arg != WORDBREAK])):
-        if index + 1 > cmd_param.nargs:
-            break
-        if start_of_option(arg_str):
-            last_option = arg_str
-
-    return True if last_option and last_option in cmd_param.opts else False
-
-
-def is_incomplete_argument(current_params, cmd_param):
-    """
-    :param current_params: the current params and values for this argument as already entered
-    :param cmd_param: the current command parameter
-    :return: whether or not the last argument is incomplete and corresponds to this cmd_param. In
-    other words whether or not the this cmd_param argument can still accept values
-    """
-    if not isinstance(cmd_param, Argument):
-        return False
-    current_param_values = current_params[cmd_param.name]
-    if current_param_values is None:
-        return True
-    if cmd_param.nargs == -1:
-        return True
-    if isinstance(current_param_values, abc.Iterable) \
-            and cmd_param.nargs > 1 and len(current_param_values) < cmd_param.nargs:
-        return True
-    return False
-
-
-def get_user_autocompletions(ctx, args, incomplete, cmd_param):
-    """
-    :param ctx: context associated with the parsed command
-    :param args: full list of args
-    :param incomplete: the incomplete text to autocomplete
-    :param cmd_param: command definition
-    :return: all the possible user-specified completions for the param
-    """
-    results = []
-    if isinstance(cmd_param.type, Choice):
-        # Choices don't support descriptions.
-        results = [(c, None)
-                   for c in cmd_param.type.choices if str(c).startswith(incomplete)]
-    elif cmd_param.autocompletion is not None:
-        dynamic_completions = cmd_param.autocompletion(ctx=ctx,
-                                                       args=args,
-                                                       incomplete=incomplete)
-        results = [c if isinstance(c, tuple) else (c, None)
-                   for c in dynamic_completions]
-    return results
-
-
-def get_visible_commands_starting_with(ctx, starts_with):
-    """
-    :param ctx: context associated with the parsed command
-    :starts_with: string that visible commands must start with.
-    :return: all visible (not hidden) commands that start with starts_with.
-    """
-    for c in ctx.command.list_commands(ctx):
-        if c.startswith(starts_with):
-            command = ctx.command.get_command(ctx, c)
-            if not command.hidden:
-                yield command
-
-
-def add_subcommand_completions(ctx, incomplete, completions_out):
-    # Add subcommand completions.
-    if isinstance(ctx.command, MultiCommand):
-        completions_out.extend(
-            [(c.name, c.get_short_help_str()) for c in get_visible_commands_starting_with(ctx, incomplete)])
-
-    # Walk up the context list and add any other completion possibilities from chained commands
-    while ctx.parent is not None:
-        ctx = ctx.parent
-        if isinstance(ctx.command, MultiCommand) and ctx.command.chain:
-            remaining_commands = [c for c in get_visible_commands_starting_with(ctx, incomplete)
-                                  if c.name not in ctx.protected_args]
-            completions_out.extend([(c.name, c.get_short_help_str()) for c in remaining_commands])
-
-
-def get_choices(cli, prog_name, args, incomplete):
-    """
-    :param cli: command definition
-    :param prog_name: the program that is running
-    :param args: full list of args
-    :param incomplete: the incomplete text to autocomplete
-    :return: all the possible completions for the incomplete
-    """
-    all_args = copy.deepcopy(args)
-
-    ctx = resolve_ctx(cli, prog_name, args)
-    if ctx is None:
-        return []
-
-    # In newer versions of bash long opts with '='s are partitioned, but it's easier to parse
-    # without the '='
-    if start_of_option(incomplete) and WORDBREAK in incomplete:
-        partition_incomplete = incomplete.partition(WORDBREAK)
-        all_args.append(partition_incomplete[0])
-        incomplete = partition_incomplete[2]
-    elif incomplete == WORDBREAK:
-        incomplete = ''
-
-    completions = []
-    if start_of_option(incomplete):
-        # completions for partial options
-        for param in ctx.command.params:
-            if isinstance(param, Option) and not param.hidden:
-                param_opts = [param_opt for param_opt in param.opts +
-                              param.secondary_opts if param_opt not in all_args or param.multiple]
-                completions.extend([(o, param.help) for o in param_opts if o.startswith(incomplete)])
-        return completions
-    # completion for option values from user supplied values
-    for param in ctx.command.params:
-        if is_incomplete_option(all_args, param):
-            return get_user_autocompletions(ctx, all_args, incomplete, param)
-    # completion for argument values from user supplied values
-    for param in ctx.command.params:
-        if is_incomplete_argument(ctx.params, param):
-            return get_user_autocompletions(ctx, all_args, incomplete, param)
-
-    add_subcommand_completions(ctx, incomplete, completions)
-    # Sort before returning so that proper ordering can be enforced in custom types.
-    return sorted(completions)
-
-
-def do_complete(cli, prog_name, include_descriptions):
-    cwords = split_arg_string(os.environ['COMP_WORDS'])
-    cword = int(os.environ['COMP_CWORD'])
-    args = cwords[1:cword]
-    try:
-        incomplete = cwords[cword]
-    except IndexError:
-        incomplete = ''
-
-    for item in get_choices(cli, prog_name, args, incomplete):
-        echo(item[0])
-        if include_descriptions:
-            # ZSH has trouble dealing with empty array parameters when returned from commands, so use a well defined character '_' to indicate no description is present.
-            echo(item[1] if item[1] else '_')
-
-    return True
-
-
-def bashcomplete(cli, prog_name, complete_var, complete_instr):
-    if complete_instr.startswith('source'):
-        shell = 'zsh' if complete_instr == 'source_zsh' else 'bash'
-        echo(get_completion_script(prog_name, complete_var, shell))
-        return True
-    elif complete_instr == 'complete' or complete_instr == 'complete_zsh':
-        return do_complete(cli, prog_name, complete_instr == 'complete_zsh')
-    return False
diff --git a/python/click/_compat.py b/python/click/_compat.py
deleted file mode 100644
index 937e230..0000000
--- a/python/click/_compat.py
+++ /dev/null
@@ -1,703 +0,0 @@
-import re
-import io
-import os
-import sys
-import codecs
-from weakref import WeakKeyDictionary
-
-
-PY2 = sys.version_info[0] == 2
-CYGWIN = sys.platform.startswith('cygwin')
-# Determine local App Engine environment, per Google's own suggestion
-APP_ENGINE = ('APPENGINE_RUNTIME' in os.environ and
-              'Development/' in os.environ['SERVER_SOFTWARE'])
-WIN = sys.platform.startswith('win') and not APP_ENGINE
-DEFAULT_COLUMNS = 80
-
-
-_ansi_re = re.compile(r'\033\[((?:\d|;)*)([a-zA-Z])')
-
-
-def get_filesystem_encoding():
-    return sys.getfilesystemencoding() or sys.getdefaultencoding()
-
-
-def _make_text_stream(stream, encoding, errors,
-                      force_readable=False, force_writable=False):
-    if encoding is None:
-        encoding = get_best_encoding(stream)
-    if errors is None:
-        errors = 'replace'
-    return _NonClosingTextIOWrapper(stream, encoding, errors,
-                                    line_buffering=True,
-                                    force_readable=force_readable,
-                                    force_writable=force_writable)
-
-
-def is_ascii_encoding(encoding):
-    """Checks if a given encoding is ascii."""
-    try:
-        return codecs.lookup(encoding).name == 'ascii'
-    except LookupError:
-        return False
-
-
-def get_best_encoding(stream):
-    """Returns the default stream encoding if not found."""
-    rv = getattr(stream, 'encoding', None) or sys.getdefaultencoding()
-    if is_ascii_encoding(rv):
-        return 'utf-8'
-    return rv
-
-
-class _NonClosingTextIOWrapper(io.TextIOWrapper):
-
-    def __init__(self, stream, encoding, errors,
-                 force_readable=False, force_writable=False, **extra):
-        self._stream = stream = _FixupStream(stream, force_readable,
-                                             force_writable)
-        io.TextIOWrapper.__init__(self, stream, encoding, errors, **extra)
-
-    # The io module is a place where the Python 3 text behavior
-    # was forced upon Python 2, so we need to unbreak
-    # it to look like Python 2.
-    if PY2:
-        def write(self, x):
-            if isinstance(x, str) or is_bytes(x):
-                try:
-                    self.flush()
-                except Exception:
-                    pass
-                return self.buffer.write(str(x))
-            return io.TextIOWrapper.write(self, x)
-
-        def writelines(self, lines):
-            for line in lines:
-                self.write(line)
-
-    def __del__(self):
-        try:
-            self.detach()
-        except Exception:
-            pass
-
-    def isatty(self):
-        # https://bitbucket.org/pypy/pypy/issue/1803
-        return self._stream.isatty()
-
-
-class _FixupStream(object):
-    """The new io interface needs more from streams than streams
-    traditionally implement.  As such, this fix-up code is necessary in
-    some circumstances.
-
-    The forcing of readable and writable flags are there because some tools
-    put badly patched objects on sys (one such offender are certain version
-    of jupyter notebook).
-    """
-
-    def __init__(self, stream, force_readable=False, force_writable=False):
-        self._stream = stream
-        self._force_readable = force_readable
-        self._force_writable = force_writable
-
-    def __getattr__(self, name):
-        return getattr(self._stream, name)
-
-    def read1(self, size):
-        f = getattr(self._stream, 'read1', None)
-        if f is not None:
-            return f(size)
-        # We only dispatch to readline instead of read in Python 2 as we
-        # do not want cause problems with the different implementation
-        # of line buffering.
-        if PY2:
-            return self._stream.readline(size)
-        return self._stream.read(size)
-
-    def readable(self):
-        if self._force_readable:
-            return True
-        x = getattr(self._stream, 'readable', None)
-        if x is not None:
-            return x()
-        try:
-            self._stream.read(0)
-        except Exception:
-            return False
-        return True
-
-    def writable(self):
-        if self._force_writable:
-            return True
-        x = getattr(self._stream, 'writable', None)
-        if x is not None:
-            return x()
-        try:
-            self._stream.write('')
-        except Exception:
-            try:
-                self._stream.write(b'')
-            except Exception:
-                return False
-        return True
-
-    def seekable(self):
-        x = getattr(self._stream, 'seekable', None)
-        if x is not None:
-            return x()
-        try:
-            self._stream.seek(self._stream.tell())
-        except Exception:
-            return False
-        return True
-
-
-if PY2:
-    text_type = unicode
-    bytes = str
-    raw_input = raw_input
-    string_types = (str, unicode)
-    int_types = (int, long)
-    iteritems = lambda x: x.iteritems()
-    range_type = xrange
-
-    def is_bytes(x):
-        return isinstance(x, (buffer, bytearray))
-
-    _identifier_re = re.compile(r'^[a-zA-Z_][a-zA-Z0-9_]*$')
-
-    # For Windows, we need to force stdout/stdin/stderr to binary if it's
-    # fetched for that.  This obviously is not the most correct way to do
-    # it as it changes global state.  Unfortunately, there does not seem to
-    # be a clear better way to do it as just reopening the file in binary
-    # mode does not change anything.
-    #
-    # An option would be to do what Python 3 does and to open the file as
-    # binary only, patch it back to the system, and then use a wrapper
-    # stream that converts newlines.  It's not quite clear what's the
-    # correct option here.
-    #
-    # This code also lives in _winconsole for the fallback to the console
-    # emulation stream.
-    #
-    # There are also Windows environments where the `msvcrt` module is not
-    # available (which is why we use try-catch instead of the WIN variable
-    # here), such as the Google App Engine development server on Windows. In
-    # those cases there is just nothing we can do.
-    def set_binary_mode(f):
-        return f
-
-    try:
-        import msvcrt
-    except ImportError:
-        pass
-    else:
-        def set_binary_mode(f):
-            try:
-                fileno = f.fileno()
-            except Exception:
-                pass
-            else:
-                msvcrt.setmode(fileno, os.O_BINARY)
-            return f
-
-    try:
-        import fcntl
-    except ImportError:
-        pass
-    else:
-        def set_binary_mode(f):
-            try:
-                fileno = f.fileno()
-            except Exception:
-                pass
-            else:
-                flags = fcntl.fcntl(fileno, fcntl.F_GETFL)
-                fcntl.fcntl(fileno, fcntl.F_SETFL, flags & ~os.O_NONBLOCK)
-            return f
-
-    def isidentifier(x):
-        return _identifier_re.search(x) is not None
-
-    def get_binary_stdin():
-        return set_binary_mode(sys.stdin)
-
-    def get_binary_stdout():
-        _wrap_std_stream('stdout')
-        return set_binary_mode(sys.stdout)
-
-    def get_binary_stderr():
-        _wrap_std_stream('stderr')
-        return set_binary_mode(sys.stderr)
-
-    def get_text_stdin(encoding=None, errors=None):
-        rv = _get_windows_console_stream(sys.stdin, encoding, errors)
-        if rv is not None:
-            return rv
-        return _make_text_stream(sys.stdin, encoding, errors,
-                                 force_readable=True)
-
-    def get_text_stdout(encoding=None, errors=None):
-        _wrap_std_stream('stdout')
-        rv = _get_windows_console_stream(sys.stdout, encoding, errors)
-        if rv is not None:
-            return rv
-        return _make_text_stream(sys.stdout, encoding, errors,
-                                 force_writable=True)
-
-    def get_text_stderr(encoding=None, errors=None):
-        _wrap_std_stream('stderr')
-        rv = _get_windows_console_stream(sys.stderr, encoding, errors)
-        if rv is not None:
-            return rv
-        return _make_text_stream(sys.stderr, encoding, errors,
-                                 force_writable=True)
-
-    def filename_to_ui(value):
-        if isinstance(value, bytes):
-            value = value.decode(get_filesystem_encoding(), 'replace')
-        return value
-else:
-    import io
-    text_type = str
-    raw_input = input
-    string_types = (str,)
-    int_types = (int,)
-    range_type = range
-    isidentifier = lambda x: x.isidentifier()
-    iteritems = lambda x: iter(x.items())
-
-    def is_bytes(x):
-        return isinstance(x, (bytes, memoryview, bytearray))
-
-    def _is_binary_reader(stream, default=False):
-        try:
-            return isinstance(stream.read(0), bytes)
-        except Exception:
-            return default
-            # This happens in some cases where the stream was already
-            # closed.  In this case, we assume the default.
-
-    def _is_binary_writer(stream, default=False):
-        try:
-            stream.write(b'')
-        except Exception:
-            try:
-                stream.write('')
-                return False
-            except Exception:
-                pass
-            return default
-        return True
-
-    def _find_binary_reader(stream):
-        # We need to figure out if the given stream is already binary.
-        # This can happen because the official docs recommend detaching
-        # the streams to get binary streams.  Some code might do this, so
-        # we need to deal with this case explicitly.
-        if _is_binary_reader(stream, False):
-            return stream
-
-        buf = getattr(stream, 'buffer', None)
-
-        # Same situation here; this time we assume that the buffer is
-        # actually binary in case it's closed.
-        if buf is not None and _is_binary_reader(buf, True):
-            return buf
-
-    def _find_binary_writer(stream):
-        # We need to figure out if the given stream is already binary.
-        # This can happen because the official docs recommend detatching
-        # the streams to get binary streams.  Some code might do this, so
-        # we need to deal with this case explicitly.
-        if _is_binary_writer(stream, False):
-            return stream
-
-        buf = getattr(stream, 'buffer', None)
-
-        # Same situation here; this time we assume that the buffer is
-        # actually binary in case it's closed.
-        if buf is not None and _is_binary_writer(buf, True):
-            return buf
-
-    def _stream_is_misconfigured(stream):
-        """A stream is misconfigured if its encoding is ASCII."""
-        # If the stream does not have an encoding set, we assume it's set
-        # to ASCII.  This appears to happen in certain unittest
-        # environments.  It's not quite clear what the correct behavior is
-        # but this at least will force Click to recover somehow.
-        return is_ascii_encoding(getattr(stream, 'encoding', None) or 'ascii')
-
-    def _is_compatible_text_stream(stream, encoding, errors):
-        stream_encoding = getattr(stream, 'encoding', None)
-        stream_errors = getattr(stream, 'errors', None)
-
-        # Perfect match.
-        if stream_encoding == encoding and stream_errors == errors:
-            return True
-
-        # Otherwise, it's only a compatible stream if we did not ask for
-        # an encoding.
-        if encoding is None:
-            return stream_encoding is not None
-
-        return False
-
-    def _force_correct_text_reader(text_reader, encoding, errors,
-                                   force_readable=False):
-        if _is_binary_reader(text_reader, False):
-            binary_reader = text_reader
-        else:
-            # If there is no target encoding set, we need to verify that the
-            # reader is not actually misconfigured.
-            if encoding is None and not _stream_is_misconfigured(text_reader):
-                return text_reader
-
-            if _is_compatible_text_stream(text_reader, encoding, errors):
-                return text_reader
-
-            # If the reader has no encoding, we try to find the underlying
-            # binary reader for it.  If that fails because the environment is
-            # misconfigured, we silently go with the same reader because this
-            # is too common to happen.  In that case, mojibake is better than
-            # exceptions.
-            binary_reader = _find_binary_reader(text_reader)
-            if binary_reader is None:
-                return text_reader
-
-        # At this point, we default the errors to replace instead of strict
-        # because nobody handles those errors anyways and at this point
-        # we're so fundamentally fucked that nothing can repair it.
-        if errors is None:
-            errors = 'replace'
-        return _make_text_stream(binary_reader, encoding, errors,
-                                 force_readable=force_readable)
-
-    def _force_correct_text_writer(text_writer, encoding, errors,
-                                   force_writable=False):
-        if _is_binary_writer(text_writer, False):
-            binary_writer = text_writer
-        else:
-            # If there is no target encoding set, we need to verify that the
-            # writer is not actually misconfigured.
-            if encoding is None and not _stream_is_misconfigured(text_writer):
-                return text_writer
-
-            if _is_compatible_text_stream(text_writer, encoding, errors):
-                return text_writer
-
-            # If the writer has no encoding, we try to find the underlying
-            # binary writer for it.  If that fails because the environment is
-            # misconfigured, we silently go with the same writer because this
-            # is too common to happen.  In that case, mojibake is better than
-            # exceptions.
-            binary_writer = _find_binary_writer(text_writer)
-            if binary_writer is None:
-                return text_writer
-
-        # At this point, we default the errors to replace instead of strict
-        # because nobody handles those errors anyways and at this point
-        # we're so fundamentally fucked that nothing can repair it.
-        if errors is None:
-            errors = 'replace'
-        return _make_text_stream(binary_writer, encoding, errors,
-                                 force_writable=force_writable)
-
-    def get_binary_stdin():
-        reader = _find_binary_reader(sys.stdin)
-        if reader is None:
-            raise RuntimeError('Was not able to determine binary '
-                               'stream for sys.stdin.')
-        return reader
-
-    def get_binary_stdout():
-        writer = _find_binary_writer(sys.stdout)
-        if writer is None:
-            raise RuntimeError('Was not able to determine binary '
-                               'stream for sys.stdout.')
-        return writer
-
-    def get_binary_stderr():
-        writer = _find_binary_writer(sys.stderr)
-        if writer is None:
-            raise RuntimeError('Was not able to determine binary '
-                               'stream for sys.stderr.')
-        return writer
-
-    def get_text_stdin(encoding=None, errors=None):
-        rv = _get_windows_console_stream(sys.stdin, encoding, errors)
-        if rv is not None:
-            return rv
-        return _force_correct_text_reader(sys.stdin, encoding, errors,
-                                          force_readable=True)
-
-    def get_text_stdout(encoding=None, errors=None):
-        rv = _get_windows_console_stream(sys.stdout, encoding, errors)
-        if rv is not None:
-            return rv
-        return _force_correct_text_writer(sys.stdout, encoding, errors,
-                                          force_writable=True)
-
-    def get_text_stderr(encoding=None, errors=None):
-        rv = _get_windows_console_stream(sys.stderr, encoding, errors)
-        if rv is not None:
-            return rv
-        return _force_correct_text_writer(sys.stderr, encoding, errors,
-                                          force_writable=True)
-
-    def filename_to_ui(value):
-        if isinstance(value, bytes):
-            value = value.decode(get_filesystem_encoding(), 'replace')
-        else:
-            value = value.encode('utf-8', 'surrogateescape') \
-                .decode('utf-8', 'replace')
-        return value
-
-
-def get_streerror(e, default=None):
-    if hasattr(e, 'strerror'):
-        msg = e.strerror
-    else:
-        if default is not None:
-            msg = default
-        else:
-            msg = str(e)
-    if isinstance(msg, bytes):
-        msg = msg.decode('utf-8', 'replace')
-    return msg
-
-
-def open_stream(filename, mode='r', encoding=None, errors='strict',
-                atomic=False):
-    # Standard streams first.  These are simple because they don't need
-    # special handling for the atomic flag.  It's entirely ignored.
-    if filename == '-':
-        if any(m in mode for m in ['w', 'a', 'x']):
-            if 'b' in mode:
-                return get_binary_stdout(), False
-            return get_text_stdout(encoding=encoding, errors=errors), False
-        if 'b' in mode:
-            return get_binary_stdin(), False
-        return get_text_stdin(encoding=encoding, errors=errors), False
-
-    # Non-atomic writes directly go out through the regular open functions.
-    if not atomic:
-        if encoding is None:
-            return open(filename, mode), True
-        return io.open(filename, mode, encoding=encoding, errors=errors), True
-
-    # Some usability stuff for atomic writes
-    if 'a' in mode:
-        raise ValueError(
-            'Appending to an existing file is not supported, because that '
-            'would involve an expensive `copy`-operation to a temporary '
-            'file. Open the file in normal `w`-mode and copy explicitly '
-            'if that\'s what you\'re after.'
-        )
-    if 'x' in mode:
-        raise ValueError('Use the `overwrite`-parameter instead.')
-    if 'w' not in mode:
-        raise ValueError('Atomic writes only make sense with `w`-mode.')
-
-    # Atomic writes are more complicated.  They work by opening a file
-    # as a proxy in the same folder and then using the fdopen
-    # functionality to wrap it in a Python file.  Then we wrap it in an
-    # atomic file that moves the file over on close.
-    import tempfile
-    fd, tmp_filename = tempfile.mkstemp(dir=os.path.dirname(filename),
-                                        prefix='.__atomic-write')
-
-    if encoding is not None:
-        f = io.open(fd, mode, encoding=encoding, errors=errors)
-    else:
-        f = os.fdopen(fd, mode)
-
-    return _AtomicFile(f, tmp_filename, os.path.realpath(filename)), True
-
-
-# Used in a destructor call, needs extra protection from interpreter cleanup.
-if hasattr(os, 'replace'):
-    _replace = os.replace
-    _can_replace = True
-else:
-    _replace = os.rename
-    _can_replace = not WIN
-
-
-class _AtomicFile(object):
-
-    def __init__(self, f, tmp_filename, real_filename):
-        self._f = f
-        self._tmp_filename = tmp_filename
-        self._real_filename = real_filename
-        self.closed = False
-
-    @property
-    def name(self):
-        return self._real_filename
-
-    def close(self, delete=False):
-        if self.closed:
-            return
-        self._f.close()
-        if not _can_replace:
-            try:
-                os.remove(self._real_filename)
-            except OSError:
-                pass
-        _replace(self._tmp_filename, self._real_filename)
-        self.closed = True
-
-    def __getattr__(self, name):
-        return getattr(self._f, name)
-
-    def __enter__(self):
-        return self
-
-    def __exit__(self, exc_type, exc_value, tb):
-        self.close(delete=exc_type is not None)
-
-    def __repr__(self):
-        return repr(self._f)
-
-
-auto_wrap_for_ansi = None
-colorama = None
-get_winterm_size = None
-
-
-def strip_ansi(value):
-    return _ansi_re.sub('', value)
-
-
-def should_strip_ansi(stream=None, color=None):
-    if color is None:
-        if stream is None:
-            stream = sys.stdin
-        return not isatty(stream)
-    return not color
-
-
-# If we're on Windows, we provide transparent integration through
-# colorama.  This will make ANSI colors through the echo function
-# work automatically.
-if WIN:
-    # Windows has a smaller terminal
-    DEFAULT_COLUMNS = 79
-
-    from ._winconsole import _get_windows_console_stream, _wrap_std_stream
-
-    def _get_argv_encoding():
-        import locale
-        return locale.getpreferredencoding()
-
-    if PY2:
-        def raw_input(prompt=''):
-            sys.stderr.flush()
-            if prompt:
-                stdout = _default_text_stdout()
-                stdout.write(prompt)
-            stdin = _default_text_stdin()
-            return stdin.readline().rstrip('\r\n')
-
-    try:
-        import colorama
-    except ImportError:
-        pass
-    else:
-        _ansi_stream_wrappers = WeakKeyDictionary()
-
-        def auto_wrap_for_ansi(stream, color=None):
-            """This function wraps a stream so that calls through colorama
-            are issued to the win32 console API to recolor on demand.  It
-            also ensures to reset the colors if a write call is interrupted
-            to not destroy the console afterwards.
-            """
-            try:
-                cached = _ansi_stream_wrappers.get(stream)
-            except Exception:
-                cached = None
-            if cached is not None:
-                return cached
-            strip = should_strip_ansi(stream, color)
-            ansi_wrapper = colorama.AnsiToWin32(stream, strip=strip)
-            rv = ansi_wrapper.stream
-            _write = rv.write
-
-            def _safe_write(s):
-                try:
-                    return _write(s)
-                except:
-                    ansi_wrapper.reset_all()
-                    raise
-
-            rv.write = _safe_write
-            try:
-                _ansi_stream_wrappers[stream] = rv
-            except Exception:
-                pass
-            return rv
-
-        def get_winterm_size():
-            win = colorama.win32.GetConsoleScreenBufferInfo(
-                colorama.win32.STDOUT).srWindow
-            return win.Right - win.Left, win.Bottom - win.Top
-else:
-    def _get_argv_encoding():
-        return getattr(sys.stdin, 'encoding', None) or get_filesystem_encoding()
-
-    _get_windows_console_stream = lambda *x: None
-    _wrap_std_stream = lambda *x: None
-
-
-def term_len(x):
-    return len(strip_ansi(x))
-
-
-def isatty(stream):
-    try:
-        return stream.isatty()
-    except Exception:
-        return False
-
-
-def _make_cached_stream_func(src_func, wrapper_func):
-    cache = WeakKeyDictionary()
-    def func():
-        stream = src_func()
-        try:
-            rv = cache.get(stream)
-        except Exception:
-            rv = None
-        if rv is not None:
-            return rv
-        rv = wrapper_func()
-        try:
-            stream = src_func()  # In case wrapper_func() modified the stream
-            cache[stream] = rv
-        except Exception:
-            pass
-        return rv
-    return func
-
-
-_default_text_stdin = _make_cached_stream_func(
-    lambda: sys.stdin, get_text_stdin)
-_default_text_stdout = _make_cached_stream_func(
-    lambda: sys.stdout, get_text_stdout)
-_default_text_stderr = _make_cached_stream_func(
-    lambda: sys.stderr, get_text_stderr)
-
-
-binary_streams = {
-    'stdin': get_binary_stdin,
-    'stdout': get_binary_stdout,
-    'stderr': get_binary_stderr,
-}
-
-text_streams = {
-    'stdin': get_text_stdin,
-    'stdout': get_text_stdout,
-    'stderr': get_text_stderr,
-}
diff --git a/python/click/_termui_impl.py b/python/click/_termui_impl.py
deleted file mode 100644
index 00a8e5e..0000000
--- a/python/click/_termui_impl.py
+++ /dev/null
@@ -1,621 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-click._termui_impl
-~~~~~~~~~~~~~~~~~~
-
-This module contains implementations for the termui module. To keep the
-import time of Click down, some infrequently used functionality is
-placed in this module and only imported as needed.
-
-:copyright: © 2014 by the Pallets team.
-:license: BSD, see LICENSE.rst for more details.
-"""
-
-import os
-import sys
-import time
-import math
-import contextlib
-from ._compat import _default_text_stdout, range_type, PY2, isatty, \
-     open_stream, strip_ansi, term_len, get_best_encoding, WIN, int_types, \
-     CYGWIN
-from .utils import echo
-from .exceptions import ClickException
-
-
-if os.name == 'nt':
-    BEFORE_BAR = '\r'
-    AFTER_BAR = '\n'
-else:
-    BEFORE_BAR = '\r\033[?25l'
-    AFTER_BAR = '\033[?25h\n'
-
-
-def _length_hint(obj):
-    """Returns the length hint of an object."""
-    try:
-        return len(obj)
-    except (AttributeError, TypeError):
-        try:
-            get_hint = type(obj).__length_hint__
-        except AttributeError:
-            return None
-        try:
-            hint = get_hint(obj)
-        except TypeError:
-            return None
-        if hint is NotImplemented or \
-           not isinstance(hint, int_types) or \
-           hint < 0:
-            return None
-        return hint
-
-
-class ProgressBar(object):
-
-    def __init__(self, iterable, length=None, fill_char='#', empty_char=' ',
-                 bar_template='%(bar)s', info_sep='  ', show_eta=True,
-                 show_percent=None, show_pos=False, item_show_func=None,
-                 label=None, file=None, color=None, width=30):
-        self.fill_char = fill_char
-        self.empty_char = empty_char
-        self.bar_template = bar_template
-        self.info_sep = info_sep
-        self.show_eta = show_eta
-        self.show_percent = show_percent
-        self.show_pos = show_pos
-        self.item_show_func = item_show_func
-        self.label = label or ''
-        if file is None:
-            file = _default_text_stdout()
-        self.file = file
-        self.color = color
-        self.width = width
-        self.autowidth = width == 0
-
-        if length is None:
-            length = _length_hint(iterable)
-        if iterable is None:
-            if length is None:
-                raise TypeError('iterable or length is required')
-            iterable = range_type(length)
-        self.iter = iter(iterable)
-        self.length = length
-        self.length_known = length is not None
-        self.pos = 0
-        self.avg = []
-        self.start = self.last_eta = time.time()
-        self.eta_known = False
-        self.finished = False
-        self.max_width = None
-        self.entered = False
-        self.current_item = None
-        self.is_hidden = not isatty(self.file)
-        self._last_line = None
-        self.short_limit = 0.5
-
-    def __enter__(self):
-        self.entered = True
-        self.render_progress()
-        return self
-
-    def __exit__(self, exc_type, exc_value, tb):
-        self.render_finish()
-
-    def __iter__(self):
-        if not self.entered:
-            raise RuntimeError('You need to use progress bars in a with block.')
-        self.render_progress()
-        return self.generator()
-
-    def is_fast(self):
-        return time.time() - self.start <= self.short_limit
-
-    def render_finish(self):
-        if self.is_hidden or self.is_fast():
-            return
-        self.file.write(AFTER_BAR)
-        self.file.flush()
-
-    @property
-    def pct(self):
-        if self.finished:
-            return 1.0
-        return min(self.pos / (float(self.length) or 1), 1.0)
-
-    @property
-    def time_per_iteration(self):
-        if not self.avg:
-            return 0.0
-        return sum(self.avg) / float(len(self.avg))
-
-    @property
-    def eta(self):
-        if self.length_known and not self.finished:
-            return self.time_per_iteration * (self.length - self.pos)
-        return 0.0
-
-    def format_eta(self):
-        if self.eta_known:
-            t = int(self.eta)
-            seconds = t % 60
-            t //= 60
-            minutes = t % 60
-            t //= 60
-            hours = t % 24
-            t //= 24
-            if t > 0:
-                days = t
-                return '%dd %02d:%02d:%02d' % (days, hours, minutes, seconds)
-            else:
-                return '%02d:%02d:%02d' % (hours, minutes, seconds)
-        return ''
-
-    def format_pos(self):
-        pos = str(self.pos)
-        if self.length_known:
-            pos += '/%s' % self.length
-        return pos
-
-    def format_pct(self):
-        return ('% 4d%%' % int(self.pct * 100))[1:]
-
-    def format_bar(self):
-        if self.length_known:
-            bar_length = int(self.pct * self.width)
-            bar = self.fill_char * bar_length
-            bar += self.empty_char * (self.width - bar_length)
-        elif self.finished:
-            bar = self.fill_char * self.width
-        else:
-            bar = list(self.empty_char * (self.width or 1))
-            if self.time_per_iteration != 0:
-                bar[int((math.cos(self.pos * self.time_per_iteration)
-                    / 2.0 + 0.5) * self.width)] = self.fill_char
-            bar = ''.join(bar)
-        return bar
-
-    def format_progress_line(self):
-        show_percent = self.show_percent
-
-        info_bits = []
-        if self.length_known and show_percent is None:
-            show_percent = not self.show_pos
-
-        if self.show_pos:
-            info_bits.append(self.format_pos())
-        if show_percent:
-            info_bits.append(self.format_pct())
-        if self.show_eta and self.eta_known and not self.finished:
-            info_bits.append(self.format_eta())
-        if self.item_show_func is not None:
-            item_info = self.item_show_func(self.current_item)
-            if item_info is not None:
-                info_bits.append(item_info)
-
-        return (self.bar_template % {
-            'label': self.label,
-            'bar': self.format_bar(),
-            'info': self.info_sep.join(info_bits)
-        }).rstrip()
-
-    def render_progress(self):
-        from .termui import get_terminal_size
-
-        if self.is_hidden:
-            return
-
-        buf = []
-        # Update width in case the terminal has been resized
-        if self.autowidth:
-            old_width = self.width
-            self.width = 0
-            clutter_length = term_len(self.format_progress_line())
-            new_width = max(0, get_terminal_size()[0] - clutter_length)
-            if new_width < old_width:
-                buf.append(BEFORE_BAR)
-                buf.append(' ' * self.max_width)
-                self.max_width = new_width
-            self.width = new_width
-
-        clear_width = self.width
-        if self.max_width is not None:
-            clear_width = self.max_width
-
-        buf.append(BEFORE_BAR)
-        line = self.format_progress_line()
-        line_len = term_len(line)
-        if self.max_width is None or self.max_width < line_len:
-            self.max_width = line_len
-
-        buf.append(line)
-        buf.append(' ' * (clear_width - line_len))
-        line = ''.join(buf)
-        # Render the line only if it changed.
-
-        if line != self._last_line and not self.is_fast():
-            self._last_line = line
-            echo(line, file=self.file, color=self.color, nl=False)
-            self.file.flush()
-
-    def make_step(self, n_steps):
-        self.pos += n_steps
-        if self.length_known and self.pos >= self.length:
-            self.finished = True
-
-        if (time.time() - self.last_eta) < 1.0:
-            return
-
-        self.last_eta = time.time()
-
-        # self.avg is a rolling list of length <= 7 of steps where steps are
-        # defined as time elapsed divided by the total progress through
-        # self.length.
-        if self.pos:
-            step = (time.time() - self.start) / self.pos
-        else:
-            step = time.time() - self.start
-
-        self.avg = self.avg[-6:] + [step]
-
-        self.eta_known = self.length_known
-
-    def update(self, n_steps):
-        self.make_step(n_steps)
-        self.render_progress()
-
-    def finish(self):
-        self.eta_known = 0
-        self.current_item = None
-        self.finished = True
-
-    def generator(self):
-        """
-        Returns a generator which yields the items added to the bar during
-        construction, and updates the progress bar *after* the yielded block
-        returns.
-        """
-        if not self.entered:
-            raise RuntimeError('You need to use progress bars in a with block.')
-
-        if self.is_hidden:
-            for rv in self.iter:
-                yield rv
-        else:
-            for rv in self.iter:
-                self.current_item = rv
-                yield rv
-                self.update(1)
-            self.finish()
-            self.render_progress()
-
-
-def pager(generator, color=None):
-    """Decide what method to use for paging through text."""
-    stdout = _default_text_stdout()
-    if not isatty(sys.stdin) or not isatty(stdout):
-        return _nullpager(stdout, generator, color)
-    pager_cmd = (os.environ.get('PAGER', None) or '').strip()
-    if pager_cmd:
-        if WIN:
-            return _tempfilepager(generator, pager_cmd, color)
-        return _pipepager(generator, pager_cmd, color)
-    if os.environ.get('TERM') in ('dumb', 'emacs'):
-        return _nullpager(stdout, generator, color)
-    if WIN or sys.platform.startswith('os2'):
-        return _tempfilepager(generator, 'more <', color)
-    if hasattr(os, 'system') and os.system('(less) 2>/dev/null') == 0:
-        return _pipepager(generator, 'less', color)
-
-    import tempfile
-    fd, filename = tempfile.mkstemp()
-    os.close(fd)
-    try:
-        if hasattr(os, 'system') and os.system('more "%s"' % filename) == 0:
-            return _pipepager(generator, 'more', color)
-        return _nullpager(stdout, generator, color)
-    finally:
-        os.unlink(filename)
-
-
-def _pipepager(generator, cmd, color):
-    """Page through text by feeding it to another program.  Invoking a
-    pager through this might support colors.
-    """
-    import subprocess
-    env = dict(os.environ)
-
-    # If we're piping to less we might support colors under the
-    # condition that
-    cmd_detail = cmd.rsplit('/', 1)[-1].split()
-    if color is None and cmd_detail[0] == 'less':
-        less_flags = os.environ.get('LESS', '') + ' '.join(cmd_detail[1:])
-        if not less_flags:
-            env['LESS'] = '-R'
-            color = True
-        elif 'r' in less_flags or 'R' in less_flags:
-            color = True
-
-    c = subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE,
-                         env=env)
-    encoding = get_best_encoding(c.stdin)
-    try:
-        for text in generator:
-            if not color:
-                text = strip_ansi(text)
-
-            c.stdin.write(text.encode(encoding, 'replace'))
-    except (IOError, KeyboardInterrupt):
-        pass
-    else:
-        c.stdin.close()
-
-    # Less doesn't respect ^C, but catches it for its own UI purposes (aborting
-    # search or other commands inside less).
-    #
-    # That means when the user hits ^C, the parent process (click) terminates,
-    # but less is still alive, paging the output and messing up the terminal.
-    #
-    # If the user wants to make the pager exit on ^C, they should set
-    # `LESS='-K'`. It's not our decision to make.
-    while True:
-        try:
-            c.wait()
-        except KeyboardInterrupt:
-            pass
-        else:
-            break
-
-
-def _tempfilepager(generator, cmd, color):
-    """Page through text by invoking a program on a temporary file."""
-    import tempfile
-    filename = tempfile.mktemp()
-    # TODO: This never terminates if the passed generator never terminates.
-    text = "".join(generator)
-    if not color:
-        text = strip_ansi(text)
-    encoding = get_best_encoding(sys.stdout)
-    with open_stream(filename, 'wb')[0] as f:
-        f.write(text.encode(encoding))
-    try:
-        os.system(cmd + ' "' + filename + '"')
-    finally:
-        os.unlink(filename)
-
-
-def _nullpager(stream, generator, color):
-    """Simply print unformatted text.  This is the ultimate fallback."""
-    for text in generator:
-        if not color:
-            text = strip_ansi(text)
-        stream.write(text)
-
-
-class Editor(object):
-
-    def __init__(self, editor=None, env=None, require_save=True,
-                 extension='.txt'):
-        self.editor = editor
-        self.env = env
-        self.require_save = require_save
-        self.extension = extension
-
-    def get_editor(self):
-        if self.editor is not None:
-            return self.editor
-        for key in 'VISUAL', 'EDITOR':
-            rv = os.environ.get(key)
-            if rv:
-                return rv
-        if WIN:
-            return 'notepad'
-        for editor in 'vim', 'nano':
-            if os.system('which %s >/dev/null 2>&1' % editor) == 0:
-                return editor
-        return 'vi'
-
-    def edit_file(self, filename):
-        import subprocess
-        editor = self.get_editor()
-        if self.env:
-            environ = os.environ.copy()
-            environ.update(self.env)
-        else:
-            environ = None
-        try:
-            c = subprocess.Popen('%s "%s"' % (editor, filename),
-                                 env=environ, shell=True)
-            exit_code = c.wait()
-            if exit_code != 0:
-                raise ClickException('%s: Editing failed!' % editor)
-        except OSError as e:
-            raise ClickException('%s: Editing failed: %s' % (editor, e))
-
-    def edit(self, text):
-        import tempfile
-
-        text = text or ''
-        if text and not text.endswith('\n'):
-            text += '\n'
-
-        fd, name = tempfile.mkstemp(prefix='editor-', suffix=self.extension)
-        try:
-            if WIN:
-                encoding = 'utf-8-sig'
-                text = text.replace('\n', '\r\n')
-            else:
-                encoding = 'utf-8'
-            text = text.encode(encoding)
-
-            f = os.fdopen(fd, 'wb')
-            f.write(text)
-            f.close()
-            timestamp = os.path.getmtime(name)
-
-            self.edit_file(name)
-
-            if self.require_save \
-               and os.path.getmtime(name) == timestamp:
-                return None
-
-            f = open(name, 'rb')
-            try:
-                rv = f.read()
-            finally:
-                f.close()
-            return rv.decode('utf-8-sig').replace('\r\n', '\n')
-        finally:
-            os.unlink(name)
-
-
-def open_url(url, wait=False, locate=False):
-    import subprocess
-
-    def _unquote_file(url):
-        try:
-            import urllib
-        except ImportError:
-            import urllib
-        if url.startswith('file://'):
-            url = urllib.unquote(url[7:])
-        return url
-
-    if sys.platform == 'darwin':
-        args = ['open']
-        if wait:
-            args.append('-W')
-        if locate:
-            args.append('-R')
-        args.append(_unquote_file(url))
-        null = open('/dev/null', 'w')
-        try:
-            return subprocess.Popen(args, stderr=null).wait()
-        finally:
-            null.close()
-    elif WIN:
-        if locate:
-            url = _unquote_file(url)
-            args = 'explorer /select,"%s"' % _unquote_file(
-                url.replace('"', ''))
-        else:
-            args = 'start %s "" "%s"' % (
-                wait and '/WAIT' or '', url.replace('"', ''))
-        return os.system(args)
-    elif CYGWIN:
-        if locate:
-            url = _unquote_file(url)
-            args = 'cygstart "%s"' % (os.path.dirname(url).replace('"', ''))
-        else:
-            args = 'cygstart %s "%s"' % (
-                wait and '-w' or '', url.replace('"', ''))
-        return os.system(args)
-
-    try:
-        if locate:
-            url = os.path.dirname(_unquote_file(url)) or '.'
-        else:
-            url = _unquote_file(url)
-        c = subprocess.Popen(['xdg-open', url])
-        if wait:
-            return c.wait()
-        return 0
-    except OSError:
-        if url.startswith(('http://', 'https://')) and not locate and not wait:
-            import webbrowser
-            webbrowser.open(url)
-            return 0
-        return 1
-
-
-def _translate_ch_to_exc(ch):
-    if ch == u'\x03':
-        raise KeyboardInterrupt()
-    if ch == u'\x04' and not WIN:  # Unix-like, Ctrl+D
-        raise EOFError()
-    if ch == u'\x1a' and WIN:      # Windows, Ctrl+Z
-        raise EOFError()
-
-
-if WIN:
-    import msvcrt
-
-    @contextlib.contextmanager
-    def raw_terminal():
-        yield
-
-    def getchar(echo):
-        # The function `getch` will return a bytes object corresponding to
-        # the pressed character. Since Windows 10 build 1803, it will also
-        # return \x00 when called a second time after pressing a regular key.
-        #
-        # `getwch` does not share this probably-bugged behavior. Moreover, it
-        # returns a Unicode object by default, which is what we want.
-        #
-        # Either of these functions will return \x00 or \xe0 to indicate
-        # a special key, and you need to call the same function again to get
-        # the "rest" of the code. The fun part is that \u00e0 is
-        # "latin small letter a with grave", so if you type that on a French
-        # keyboard, you _also_ get a \xe0.
-        # E.g., consider the Up arrow. This returns \xe0 and then \x48. The
-        # resulting Unicode string reads as "a with grave" + "capital H".
-        # This is indistinguishable from when the user actually types
-        # "a with grave" and then "capital H".
-        #
-        # When \xe0 is returned, we assume it's part of a special-key sequence
-        # and call `getwch` again, but that means that when the user types
-        # the \u00e0 character, `getchar` doesn't return until a second
-        # character is typed.
-        # The alternative is returning immediately, but that would mess up
-        # cross-platform handling of arrow keys and others that start with
-        # \xe0. Another option is using `getch`, but then we can't reliably
-        # read non-ASCII characters, because return values of `getch` are
-        # limited to the current 8-bit codepage.
-        #
-        # Anyway, Click doesn't claim to do this Right(tm), and using `getwch`
-        # is doing the right thing in more situations than with `getch`.
-        if echo:
-            func = msvcrt.getwche
-        else:
-            func = msvcrt.getwch
-
-        rv = func()
-        if rv in (u'\x00', u'\xe0'):
-            # \x00 and \xe0 are control characters that indicate special key,
-            # see above.
-            rv += func()
-        _translate_ch_to_exc(rv)
-        return rv
-else:
-    import tty
-    import termios
-
-    @contextlib.contextmanager
-    def raw_terminal():
-        if not isatty(sys.stdin):
-            f = open('/dev/tty')
-            fd = f.fileno()
-        else:
-            fd = sys.stdin.fileno()
-            f = None
-        try:
-            old_settings = termios.tcgetattr(fd)
-            try:
-                tty.setraw(fd)
-                yield fd
-            finally:
-                termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
-                sys.stdout.flush()
-                if f is not None:
-                    f.close()
-        except termios.error:
-            pass
-
-    def getchar(echo):
-        with raw_terminal() as fd:
-            ch = os.read(fd, 32)
-            ch = ch.decode(get_best_encoding(sys.stdin), 'replace')
-            if echo and isatty(sys.stdout):
-                sys.stdout.write(ch)
-            _translate_ch_to_exc(ch)
-            return ch
diff --git a/python/click/_textwrap.py b/python/click/_textwrap.py
deleted file mode 100644
index 7e77603..0000000
--- a/python/click/_textwrap.py
+++ /dev/null
@@ -1,38 +0,0 @@
-import textwrap
-from contextlib import contextmanager
-
-
-class TextWrapper(textwrap.TextWrapper):
-
-    def _handle_long_word(self, reversed_chunks, cur_line, cur_len, width):
-        space_left = max(width - cur_len, 1)
-
-        if self.break_long_words:
-            last = reversed_chunks[-1]
-            cut = last[:space_left]
-            res = last[space_left:]
-            cur_line.append(cut)
-            reversed_chunks[-1] = res
-        elif not cur_line:
-            cur_line.append(reversed_chunks.pop())
-
-    @contextmanager
-    def extra_indent(self, indent):
-        old_initial_indent = self.initial_indent
-        old_subsequent_indent = self.subsequent_indent
-        self.initial_indent += indent
-        self.subsequent_indent += indent
-        try:
-            yield
-        finally:
-            self.initial_indent = old_initial_indent
-            self.subsequent_indent = old_subsequent_indent
-
-    def indent_only(self, text):
-        rv = []
-        for idx, line in enumerate(text.splitlines()):
-            indent = self.initial_indent
-            if idx > 0:
-                indent = self.subsequent_indent
-            rv.append(indent + line)
-        return '\n'.join(rv)
diff --git a/python/click/_unicodefun.py b/python/click/_unicodefun.py
deleted file mode 100644
index 620edff..0000000
--- a/python/click/_unicodefun.py
+++ /dev/null
@@ -1,125 +0,0 @@
-import os
-import sys
-import codecs
-
-from ._compat import PY2
-
-
-# If someone wants to vendor click, we want to ensure the
-# correct package is discovered.  Ideally we could use a
-# relative import here but unfortunately Python does not
-# support that.
-click = sys.modules[__name__.rsplit('.', 1)[0]]
-
-
-def _find_unicode_literals_frame():
-    import __future__
-    if not hasattr(sys, '_getframe'):  # not all Python implementations have it
-        return 0
-    frm = sys._getframe(1)
-    idx = 1
-    while frm is not None:
-        if frm.f_globals.get('__name__', '').startswith('click.'):
-            frm = frm.f_back
-            idx += 1
-        elif frm.f_code.co_flags & __future__.unicode_literals.compiler_flag:
-            return idx
-        else:
-            break
-    return 0
-
-
-def _check_for_unicode_literals():
-    if not __debug__:
-        return
-    if not PY2 or click.disable_unicode_literals_warning:
-        return
-    bad_frame = _find_unicode_literals_frame()
-    if bad_frame <= 0:
-        return
-    from warnings import warn
-    warn(Warning('Click detected the use of the unicode_literals '
-                 '__future__ import.  This is heavily discouraged '
-                 'because it can introduce subtle bugs in your '
-                 'code.  You should instead use explicit u"" literals '
-                 'for your unicode strings.  For more information see '
-                 'https://click.palletsprojects.com/python3/'),
-         stacklevel=bad_frame)
-
-
-def _verify_python3_env():
-    """Ensures that the environment is good for unicode on Python 3."""
-    if PY2:
-        return
-    try:
-        import locale
-        fs_enc = codecs.lookup(locale.getpreferredencoding()).name
-    except Exception:
-        fs_enc = 'ascii'
-    if fs_enc != 'ascii':
-        return
-
-    extra = ''
-    if os.name == 'posix':
-        import subprocess
-        try:
-            rv = subprocess.Popen(['locale', '-a'], stdout=subprocess.PIPE,
-                                  stderr=subprocess.PIPE).communicate()[0]
-        except OSError:
-            rv = b''
-        good_locales = set()
-        has_c_utf8 = False
-
-        # Make sure we're operating on text here.
-        if isinstance(rv, bytes):
-            rv = rv.decode('ascii', 'replace')
-
-        for line in rv.splitlines():
-            locale = line.strip()
-            if locale.lower().endswith(('.utf-8', '.utf8')):
-                good_locales.add(locale)
-                if locale.lower() in ('c.utf8', 'c.utf-8'):
-                    has_c_utf8 = True
-
-        extra += '\n\n'
-        if not good_locales:
-            extra += (
-                'Additional information: on this system no suitable UTF-8\n'
-                'locales were discovered.  This most likely requires resolving\n'
-                'by reconfiguring the locale system.'
-            )
-        elif has_c_utf8:
-            extra += (
-                'This system supports the C.UTF-8 locale which is recommended.\n'
-                'You might be able to resolve your issue by exporting the\n'
-                'following environment variables:\n\n'
-                '    export LC_ALL=C.UTF-8\n'
-                '    export LANG=C.UTF-8'
-            )
-        else:
-            extra += (
-                'This system lists a couple of UTF-8 supporting locales that\n'
-                'you can pick from.  The following suitable locales were\n'
-                'discovered: %s'
-            ) % ', '.join(sorted(good_locales))
-
-        bad_locale = None
-        for locale in os.environ.get('LC_ALL'), os.environ.get('LANG'):
-            if locale and locale.lower().endswith(('.utf-8', '.utf8')):
-                bad_locale = locale
-            if locale is not None:
-                break
-        if bad_locale is not None:
-            extra += (
-                '\n\nClick discovered that you exported a UTF-8 locale\n'
-                'but the locale system could not pick up from it because\n'
-                'it does not exist.  The exported locale is "%s" but it\n'
-                'is not supported'
-            ) % bad_locale
-
-    raise RuntimeError(
-        'Click will abort further execution because Python 3 was'
-        ' configured to use ASCII as encoding for the environment.'
-        ' Consult https://click.palletsprojects.com/en/7.x/python3/ for'
-        ' mitigation steps.' + extra
-    )
diff --git a/python/click/_winconsole.py b/python/click/_winconsole.py
deleted file mode 100644
index bbb080d..0000000
--- a/python/click/_winconsole.py
+++ /dev/null
@@ -1,307 +0,0 @@
-# -*- coding: utf-8 -*-
-# This module is based on the excellent work by Adam Bartoš who
-# provided a lot of what went into the implementation here in
-# the discussion to issue1602 in the Python bug tracker.
-#
-# There are some general differences in regards to how this works
-# compared to the original patches as we do not need to patch
-# the entire interpreter but just work in our little world of
-# echo and prmopt.
-
-import io
-import os
-import sys
-import zlib
-import time
-import ctypes
-import msvcrt
-from ._compat import _NonClosingTextIOWrapper, text_type, PY2
-from ctypes import byref, POINTER, c_int, c_char, c_char_p, \
-     c_void_p, py_object, c_ssize_t, c_ulong, windll, WINFUNCTYPE
-try:
-    from ctypes import pythonapi
-    PyObject_GetBuffer = pythonapi.PyObject_GetBuffer
-    PyBuffer_Release = pythonapi.PyBuffer_Release
-except ImportError:
-    pythonapi = None
-from ctypes.wintypes import LPWSTR, LPCWSTR
-
-
-c_ssize_p = POINTER(c_ssize_t)
-
-kernel32 = windll.kernel32
-GetStdHandle = kernel32.GetStdHandle
-ReadConsoleW = kernel32.ReadConsoleW
-WriteConsoleW = kernel32.WriteConsoleW
-GetLastError = kernel32.GetLastError
-GetCommandLineW = WINFUNCTYPE(LPWSTR)(
-    ('GetCommandLineW', windll.kernel32))
-CommandLineToArgvW = WINFUNCTYPE(
-    POINTER(LPWSTR), LPCWSTR, POINTER(c_int))(
-        ('CommandLineToArgvW', windll.shell32))
-
-
-STDIN_HANDLE = GetStdHandle(-10)
-STDOUT_HANDLE = GetStdHandle(-11)
-STDERR_HANDLE = GetStdHandle(-12)
-
-
-PyBUF_SIMPLE = 0
-PyBUF_WRITABLE = 1
-
-ERROR_SUCCESS = 0
-ERROR_NOT_ENOUGH_MEMORY = 8
-ERROR_OPERATION_ABORTED = 995
-
-STDIN_FILENO = 0
-STDOUT_FILENO = 1
-STDERR_FILENO = 2
-
-EOF = b'\x1a'
-MAX_BYTES_WRITTEN = 32767
-
-
-class Py_buffer(ctypes.Structure):
-    _fields_ = [
-        ('buf', c_void_p),
-        ('obj', py_object),
-        ('len', c_ssize_t),
-        ('itemsize', c_ssize_t),
-        ('readonly', c_int),
-        ('ndim', c_int),
-        ('format', c_char_p),
-        ('shape', c_ssize_p),
-        ('strides', c_ssize_p),
-        ('suboffsets', c_ssize_p),
-        ('internal', c_void_p)
-    ]
-
-    if PY2:
-        _fields_.insert(-1, ('smalltable', c_ssize_t * 2))
-
-
-# On PyPy we cannot get buffers so our ability to operate here is
-# serverly limited.
-if pythonapi is None:
-    get_buffer = None
-else:
-    def get_buffer(obj, writable=False):
-        buf = Py_buffer()
-        flags = PyBUF_WRITABLE if writable else PyBUF_SIMPLE
-        PyObject_GetBuffer(py_object(obj), byref(buf), flags)
-        try:
-            buffer_type = c_char * buf.len
-            return buffer_type.from_address(buf.buf)
-        finally:
-            PyBuffer_Release(byref(buf))
-
-
-class _WindowsConsoleRawIOBase(io.RawIOBase):
-
-    def __init__(self, handle):
-        self.handle = handle
-
-    def isatty(self):
-        io.RawIOBase.isatty(self)
-        return True
-
-
-class _WindowsConsoleReader(_WindowsConsoleRawIOBase):
-
-    def readable(self):
-        return True
-
-    def readinto(self, b):
-        bytes_to_be_read = len(b)
-        if not bytes_to_be_read:
-            return 0
-        elif bytes_to_be_read % 2:
-            raise ValueError('cannot read odd number of bytes from '
-                             'UTF-16-LE encoded console')
-
-        buffer = get_buffer(b, writable=True)
-        code_units_to_be_read = bytes_to_be_read // 2
-        code_units_read = c_ulong()
-
-        rv = ReadConsoleW(self.handle, buffer, code_units_to_be_read,
-                          byref(code_units_read), None)
-        if GetLastError() == ERROR_OPERATION_ABORTED:
-            # wait for KeyboardInterrupt
-            time.sleep(0.1)
-        if not rv:
-            raise OSError('Windows error: %s' % GetLastError())
-
-        if buffer[0] == EOF:
-            return 0
-        return 2 * code_units_read.value
-
-
-class _WindowsConsoleWriter(_WindowsConsoleRawIOBase):
-
-    def writable(self):
-        return True
-
-    @staticmethod
-    def _get_error_message(errno):
-        if errno == ERROR_SUCCESS:
-            return 'ERROR_SUCCESS'
-        elif errno == ERROR_NOT_ENOUGH_MEMORY:
-            return 'ERROR_NOT_ENOUGH_MEMORY'
-        return 'Windows error %s' % errno
-
-    def write(self, b):
-        bytes_to_be_written = len(b)
-        buf = get_buffer(b)
-        code_units_to_be_written = min(bytes_to_be_written,
-                                       MAX_BYTES_WRITTEN) // 2
-        code_units_written = c_ulong()
-
-        WriteConsoleW(self.handle, buf, code_units_to_be_written,
-                      byref(code_units_written), None)
-        bytes_written = 2 * code_units_written.value
-
-        if bytes_written == 0 and bytes_to_be_written > 0:
-            raise OSError(self._get_error_message(GetLastError()))
-        return bytes_written
-
-
-class ConsoleStream(object):
-
-    def __init__(self, text_stream, byte_stream):
-        self._text_stream = text_stream
-        self.buffer = byte_stream
-
-    @property
-    def name(self):
-        return self.buffer.name
-
-    def write(self, x):
-        if isinstance(x, text_type):
-            return self._text_stream.write(x)
-        try:
-            self.flush()
-        except Exception:
-            pass
-        return self.buffer.write(x)
-
-    def writelines(self, lines):
-        for line in lines:
-            self.write(line)
-
-    def __getattr__(self, name):
-        return getattr(self._text_stream, name)
-
-    def isatty(self):
-        return self.buffer.isatty()
-
-    def __repr__(self):
-        return '<ConsoleStream name=%r encoding=%r>' % (
-            self.name,
-            self.encoding,
-        )
-
-
-class WindowsChunkedWriter(object):
-    """
-    Wraps a stream (such as stdout), acting as a transparent proxy for all
-    attribute access apart from method 'write()' which we wrap to write in
-    limited chunks due to a Windows limitation on binary console streams.
-    """
-    def __init__(self, wrapped):
-        # double-underscore everything to prevent clashes with names of
-        # attributes on the wrapped stream object.
-        self.__wrapped = wrapped
-
-    def __getattr__(self, name):
-        return getattr(self.__wrapped, name)
-
-    def write(self, text):
-        total_to_write = len(text)
-        written = 0
-
-        while written < total_to_write:
-            to_write = min(total_to_write - written, MAX_BYTES_WRITTEN)
-            self.__wrapped.write(text[written:written+to_write])
-            written += to_write
-
-
-_wrapped_std_streams = set()
-
-
-def _wrap_std_stream(name):
-    # Python 2 & Windows 7 and below
-    if PY2 and sys.getwindowsversion()[:2] <= (6, 1) and name not in _wrapped_std_streams:
-        setattr(sys, name, WindowsChunkedWriter(getattr(sys, name)))
-        _wrapped_std_streams.add(name)
-
-
-def _get_text_stdin(buffer_stream):
-    text_stream = _NonClosingTextIOWrapper(
-        io.BufferedReader(_WindowsConsoleReader(STDIN_HANDLE)),
-        'utf-16-le', 'strict', line_buffering=True)
-    return ConsoleStream(text_stream, buffer_stream)
-
-
-def _get_text_stdout(buffer_stream):
-    text_stream = _NonClosingTextIOWrapper(
-        io.BufferedWriter(_WindowsConsoleWriter(STDOUT_HANDLE)),
-        'utf-16-le', 'strict', line_buffering=True)
-    return ConsoleStream(text_stream, buffer_stream)
-
-
-def _get_text_stderr(buffer_stream):
-    text_stream = _NonClosingTextIOWrapper(
-        io.BufferedWriter(_WindowsConsoleWriter(STDERR_HANDLE)),
-        'utf-16-le', 'strict', line_buffering=True)
-    return ConsoleStream(text_stream, buffer_stream)
-
-
-if PY2:
-    def _hash_py_argv():
-        return zlib.crc32('\x00'.join(sys.argv[1:]))
-
-    _initial_argv_hash = _hash_py_argv()
-
-    def _get_windows_argv():
-        argc = c_int(0)
-        argv_unicode = CommandLineToArgvW(GetCommandLineW(), byref(argc))
-        argv = [argv_unicode[i] for i in range(0, argc.value)]
-
-        if not hasattr(sys, 'frozen'):
-            argv = argv[1:]
-            while len(argv) > 0:
-                arg = argv[0]
-                if not arg.startswith('-') or arg == '-':
-                    break
-                argv = argv[1:]
-                if arg.startswith(('-c', '-m')):
-                    break
-
-        return argv[1:]
-
-
-_stream_factories = {
-    0: _get_text_stdin,
-    1: _get_text_stdout,
-    2: _get_text_stderr,
-}
-
-
-def _get_windows_console_stream(f, encoding, errors):
-    if get_buffer is not None and \
-       encoding in ('utf-16-le', None) \
-       and errors in ('strict', None) and \
-       hasattr(f, 'isatty') and f.isatty():
-        func = _stream_factories.get(f.fileno())
-        if func is not None:
-            if not PY2:
-                f = getattr(f, 'buffer', None)
-                if f is None:
-                    return None
-            else:
-                # If we are on Python 2 we need to set the stream that we
-                # deal with to binary mode as otherwise the exercise if a
-                # bit moot.  The same problems apply as for
-                # get_binary_stdin and friends from _compat.
-                msvcrt.setmode(f.fileno(), os.O_BINARY)
-            return func(f)
diff --git a/python/click/core.py b/python/click/core.py
deleted file mode 100644
index 7a1e342..0000000
--- a/python/click/core.py
+++ /dev/null
@@ -1,1856 +0,0 @@
-import errno
-import inspect
-import os
-import sys
-from contextlib import contextmanager
-from itertools import repeat
-from functools import update_wrapper
-
-from .types import convert_type, IntRange, BOOL
-from .utils import PacifyFlushWrapper, make_str, make_default_short_help, \
-     echo, get_os_args
-from .exceptions import ClickException, UsageError, BadParameter, Abort, \
-     MissingParameter, Exit
-from .termui import prompt, confirm, style
-from .formatting import HelpFormatter, join_options
-from .parser import OptionParser, split_opt
-from .globals import push_context, pop_context
-
-from ._compat import PY2, isidentifier, iteritems, string_types
-from ._unicodefun import _check_for_unicode_literals, _verify_python3_env
-
-
-_missing = object()
-
-
-SUBCOMMAND_METAVAR = 'COMMAND [ARGS]...'
-SUBCOMMANDS_METAVAR = 'COMMAND1 [ARGS]... [COMMAND2 [ARGS]...]...'
-
-DEPRECATED_HELP_NOTICE = ' (DEPRECATED)'
-DEPRECATED_INVOKE_NOTICE = 'DeprecationWarning: ' + \
-                           'The command %(name)s is deprecated.'
-
-
-def _maybe_show_deprecated_notice(cmd):
-    if cmd.deprecated:
-        echo(style(DEPRECATED_INVOKE_NOTICE % {'name': cmd.name}, fg='red'), err=True)
-
-
-def fast_exit(code):
-    """Exit without garbage collection, this speeds up exit by about 10ms for
-    things like bash completion.
-    """
-    sys.stdout.flush()
-    sys.stderr.flush()
-    os._exit(code)
-
-
-def _bashcomplete(cmd, prog_name, complete_var=None):
-    """Internal handler for the bash completion support."""
-    if complete_var is None:
-        complete_var = '_%s_COMPLETE' % (prog_name.replace('-', '_')).upper()
-    complete_instr = os.environ.get(complete_var)
-    if not complete_instr:
-        return
-
-    from ._bashcomplete import bashcomplete
-    if bashcomplete(cmd, prog_name, complete_var, complete_instr):
-        fast_exit(1)
-
-
-def _check_multicommand(base_command, cmd_name, cmd, register=False):
-    if not base_command.chain or not isinstance(cmd, MultiCommand):
-        return
-    if register:
-        hint = 'It is not possible to add multi commands as children to ' \
-               'another multi command that is in chain mode'
-    else:
-        hint = 'Found a multi command as subcommand to a multi command ' \
-               'that is in chain mode.  This is not supported'
-    raise RuntimeError('%s.  Command "%s" is set to chain and "%s" was '
-                       'added as subcommand but it in itself is a '
-                       'multi command.  ("%s" is a %s within a chained '
-                       '%s named "%s").' % (
-                           hint, base_command.name, cmd_name,
-                           cmd_name, cmd.__class__.__name__,
-                           base_command.__class__.__name__,
-                           base_command.name))
-
-
-def batch(iterable, batch_size):
-    return list(zip(*repeat(iter(iterable), batch_size)))
-
-
-def invoke_param_callback(callback, ctx, param, value):
-    code = getattr(callback, '__code__', None)
-    args = getattr(code, 'co_argcount', 3)
-
-    if args < 3:
-        # This will become a warning in Click 3.0:
-        from warnings import warn
-        warn(Warning('Invoked legacy parameter callback "%s".  The new '
-                     'signature for such callbacks starting with '
-                     'click 2.0 is (ctx, param, value).'
-                     % callback), stacklevel=3)
-        return callback(ctx, value)
-    return callback(ctx, param, value)
-
-
-@contextmanager
-def augment_usage_errors(ctx, param=None):
-    """Context manager that attaches extra information to exceptions that
-    fly.
-    """
-    try:
-        yield
-    except BadParameter as e:
-        if e.ctx is None:
-            e.ctx = ctx
-        if param is not None and e.param is None:
-            e.param = param
-        raise
-    except UsageError as e:
-        if e.ctx is None:
-            e.ctx = ctx
-        raise
-
-
-def iter_params_for_processing(invocation_order, declaration_order):
-    """Given a sequence of parameters in the order as should be considered
-    for processing and an iterable of parameters that exist, this returns
-    a list in the correct order as they should be processed.
-    """
-    def sort_key(item):
-        try:
-            idx = invocation_order.index(item)
-        except ValueError:
-            idx = float('inf')
-        return (not item.is_eager, idx)
-
-    return sorted(declaration_order, key=sort_key)
-
-
-class Context(object):
-    """The context is a special internal object that holds state relevant
-    for the script execution at every single level.  It's normally invisible
-    to commands unless they opt-in to getting access to it.
-
-    The context is useful as it can pass internal objects around and can
-    control special execution features such as reading data from
-    environment variables.
-
-    A context can be used as context manager in which case it will call
-    :meth:`close` on teardown.
-
-    .. versionadded:: 2.0
-       Added the `resilient_parsing`, `help_option_names`,
-       `token_normalize_func` parameters.
-
-    .. versionadded:: 3.0
-       Added the `allow_extra_args` and `allow_interspersed_args`
-       parameters.
-
-    .. versionadded:: 4.0
-       Added the `color`, `ignore_unknown_options`, and
-       `max_content_width` parameters.
-
-    :param command: the command class for this context.
-    :param parent: the parent context.
-    :param info_name: the info name for this invocation.  Generally this
-                      is the most descriptive name for the script or
-                      command.  For the toplevel script it is usually
-                      the name of the script, for commands below it it's
-                      the name of the script.
-    :param obj: an arbitrary object of user data.
-    :param auto_envvar_prefix: the prefix to use for automatic environment
-                               variables.  If this is `None` then reading
-                               from environment variables is disabled.  This
-                               does not affect manually set environment
-                               variables which are always read.
-    :param default_map: a dictionary (like object) with default values
-                        for parameters.
-    :param terminal_width: the width of the terminal.  The default is
-                           inherit from parent context.  If no context
-                           defines the terminal width then auto
-                           detection will be applied.
-    :param max_content_width: the maximum width for content rendered by
-                              Click (this currently only affects help
-                              pages).  This defaults to 80 characters if
-                              not overridden.  In other words: even if the
-                              terminal is larger than that, Click will not
-                              format things wider than 80 characters by
-                              default.  In addition to that, formatters might
-                              add some safety mapping on the right.
-    :param resilient_parsing: if this flag is enabled then Click will
-                              parse without any interactivity or callback
-                              invocation.  Default values will also be
-                              ignored.  This is useful for implementing
-                              things such as completion support.
-    :param allow_extra_args: if this is set to `True` then extra arguments
-                             at the end will not raise an error and will be
-                             kept on the context.  The default is to inherit
-                             from the command.
-    :param allow_interspersed_args: if this is set to `False` then options
-                                    and arguments cannot be mixed.  The
-                                    default is to inherit from the command.
-    :param ignore_unknown_options: instructs click to ignore options it does
-                                   not know and keeps them for later
-                                   processing.
-    :param help_option_names: optionally a list of strings that define how
-                              the default help parameter is named.  The
-                              default is ``['--help']``.
-    :param token_normalize_func: an optional function that is used to
-                                 normalize tokens (options, choices,
-                                 etc.).  This for instance can be used to
-                                 implement case insensitive behavior.
-    :param color: controls if the terminal supports ANSI colors or not.  The
-                  default is autodetection.  This is only needed if ANSI
-                  codes are used in texts that Click prints which is by
-                  default not the case.  This for instance would affect
-                  help output.
-    """
-
-    def __init__(self, command, parent=None, info_name=None, obj=None,
-                 auto_envvar_prefix=None, default_map=None,
-                 terminal_width=None, max_content_width=None,
-                 resilient_parsing=False, allow_extra_args=None,
-                 allow_interspersed_args=None,
-                 ignore_unknown_options=None, help_option_names=None,
-                 token_normalize_func=None, color=None):
-        #: the parent context or `None` if none exists.
-        self.parent = parent
-        #: the :class:`Command` for this context.
-        self.command = command
-        #: the descriptive information name
-        self.info_name = info_name
-        #: the parsed parameters except if the value is hidden in which
-        #: case it's not remembered.
-        self.params = {}
-        #: the leftover arguments.
-        self.args = []
-        #: protected arguments.  These are arguments that are prepended
-        #: to `args` when certain parsing scenarios are encountered but
-        #: must be never propagated to another arguments.  This is used
-        #: to implement nested parsing.
-        self.protected_args = []
-        if obj is None and parent is not None:
-            obj = parent.obj
-        #: the user object stored.
-        self.obj = obj
-        self._meta = getattr(parent, 'meta', {})
-
-        #: A dictionary (-like object) with defaults for parameters.
-        if default_map is None \
-           and parent is not None \
-           and parent.default_map is not None:
-            default_map = parent.default_map.get(info_name)
-        self.default_map = default_map
-
-        #: This flag indicates if a subcommand is going to be executed. A
-        #: group callback can use this information to figure out if it's
-        #: being executed directly or because the execution flow passes
-        #: onwards to a subcommand. By default it's None, but it can be
-        #: the name of the subcommand to execute.
-        #:
-        #: If chaining is enabled this will be set to ``'*'`` in case
-        #: any commands are executed.  It is however not possible to
-        #: figure out which ones.  If you require this knowledge you
-        #: should use a :func:`resultcallback`.
-        self.invoked_subcommand = None
-
-        if terminal_width is None and parent is not None:
-            terminal_width = parent.terminal_width
-        #: The width of the terminal (None is autodetection).
-        self.terminal_width = terminal_width
-
-        if max_content_width is None and parent is not None:
-            max_content_width = parent.max_content_width
-        #: The maximum width of formatted content (None implies a sensible
-        #: default which is 80 for most things).
-        self.max_content_width = max_content_width
-
-        if allow_extra_args is None:
-            allow_extra_args = command.allow_extra_args
-        #: Indicates if the context allows extra args or if it should
-        #: fail on parsing.
-        #:
-        #: .. versionadded:: 3.0
-        self.allow_extra_args = allow_extra_args
-
-        if allow_interspersed_args is None:
-            allow_interspersed_args = command.allow_interspersed_args
-        #: Indicates if the context allows mixing of arguments and
-        #: options or not.
-        #:
-        #: .. versionadded:: 3.0
-        self.allow_interspersed_args = allow_interspersed_args
-
-        if ignore_unknown_options is None:
-            ignore_unknown_options = command.ignore_unknown_options
-        #: Instructs click to ignore options that a command does not
-        #: understand and will store it on the context for later
-        #: processing.  This is primarily useful for situations where you
-        #: want to call into external programs.  Generally this pattern is
-        #: strongly discouraged because it's not possibly to losslessly
-        #: forward all arguments.
-        #:
-        #: .. versionadded:: 4.0
-        self.ignore_unknown_options = ignore_unknown_options
-
-        if help_option_names is None:
-            if parent is not None:
-                help_option_names = parent.help_option_names
-            else:
-                help_option_names = ['--help']
-
-        #: The names for the help options.
-        self.help_option_names = help_option_names
-
-        if token_normalize_func is None and parent is not None:
-            token_normalize_func = parent.token_normalize_func
-
-        #: An optional normalization function for tokens.  This is
-        #: options, choices, commands etc.
-        self.token_normalize_func = token_normalize_func
-
-        #: Indicates if resilient parsing is enabled.  In that case Click
-        #: will do its best to not cause any failures and default values
-        #: will be ignored. Useful for completion.
-        self.resilient_parsing = resilient_parsing
-
-        # If there is no envvar prefix yet, but the parent has one and
-        # the command on this level has a name, we can expand the envvar
-        # prefix automatically.
-        if auto_envvar_prefix is None:
-            if parent is not None \
-               and parent.auto_envvar_prefix is not None and \
-               self.info_name is not None:
-                auto_envvar_prefix = '%s_%s' % (parent.auto_envvar_prefix,
-                                           self.info_name.upper())
-        else:
-            auto_envvar_prefix = auto_envvar_prefix.upper()
-        self.auto_envvar_prefix = auto_envvar_prefix
-
-        if color is None and parent is not None:
-            color = parent.color
-
-        #: Controls if styling output is wanted or not.
-        self.color = color
-
-        self._close_callbacks = []
-        self._depth = 0
-
-    def __enter__(self):
-        self._depth += 1
-        push_context(self)
-        return self
-
-    def __exit__(self, exc_type, exc_value, tb):
-        self._depth -= 1
-        if self._depth == 0:
-            self.close()
-        pop_context()
-
-    @contextmanager
-    def scope(self, cleanup=True):
-        """This helper method can be used with the context object to promote
-        it to the current thread local (see :func:`get_current_context`).
-        The default behavior of this is to invoke the cleanup functions which
-        can be disabled by setting `cleanup` to `False`.  The cleanup
-        functions are typically used for things such as closing file handles.
-
-        If the cleanup is intended the context object can also be directly
-        used as a context manager.
-
-        Example usage::
-
-            with ctx.scope():
-                assert get_current_context() is ctx
-
-        This is equivalent::
-
-            with ctx:
-                assert get_current_context() is ctx
-
-        .. versionadded:: 5.0
-
-        :param cleanup: controls if the cleanup functions should be run or
-                        not.  The default is to run these functions.  In
-                        some situations the context only wants to be
-                        temporarily pushed in which case this can be disabled.
-                        Nested pushes automatically defer the cleanup.
-        """
-        if not cleanup:
-            self._depth += 1
-        try:
-            with self as rv:
-                yield rv
-        finally:
-            if not cleanup:
-                self._depth -= 1
-
-    @property
-    def meta(self):
-        """This is a dictionary which is shared with all the contexts
-        that are nested.  It exists so that click utilities can store some
-        state here if they need to.  It is however the responsibility of
-        that code to manage this dictionary well.
-
-        The keys are supposed to be unique dotted strings.  For instance
-        module paths are a good choice for it.  What is stored in there is
-        irrelevant for the operation of click.  However what is important is
-        that code that places data here adheres to the general semantics of
-        the system.
-
-        Example usage::
-
-            LANG_KEY = __name__ + '.lang'
-
-            def set_language(value):
-                ctx = get_current_context()
-                ctx.meta[LANG_KEY] = value
-
-            def get_language():
-                return get_current_context().meta.get(LANG_KEY, 'en_US')
-
-        .. versionadded:: 5.0
-        """
-        return self._meta
-
-    def make_formatter(self):
-        """Creates the formatter for the help and usage output."""
-        return HelpFormatter(width=self.terminal_width,
-                             max_width=self.max_content_width)
-
-    def call_on_close(self, f):
-        """This decorator remembers a function as callback that should be
-        executed when the context tears down.  This is most useful to bind
-        resource handling to the script execution.  For instance, file objects
-        opened by the :class:`File` type will register their close callbacks
-        here.
-
-        :param f: the function to execute on teardown.
-        """
-        self._close_callbacks.append(f)
-        return f
-
-    def close(self):
-        """Invokes all close callbacks."""
-        for cb in self._close_callbacks:
-            cb()
-        self._close_callbacks = []
-
-    @property
-    def command_path(self):
-        """The computed command path.  This is used for the ``usage``
-        information on the help page.  It's automatically created by
-        combining the info names of the chain of contexts to the root.
-        """
-        rv = ''
-        if self.info_name is not None:
-            rv = self.info_name
-        if self.parent is not None:
-            rv = self.parent.command_path + ' ' + rv
-        return rv.lstrip()
-
-    def find_root(self):
-        """Finds the outermost context."""
-        node = self
-        while node.parent is not None:
-            node = node.parent
-        return node
-
-    def find_object(self, object_type):
-        """Finds the closest object of a given type."""
-        node = self
-        while node is not None:
-            if isinstance(node.obj, object_type):
-                return node.obj
-            node = node.parent
-
-    def ensure_object(self, object_type):
-        """Like :meth:`find_object` but sets the innermost object to a
-        new instance of `object_type` if it does not exist.
-        """
-        rv = self.find_object(object_type)
-        if rv is None:
-            self.obj = rv = object_type()
-        return rv
-
-    def lookup_default(self, name):
-        """Looks up the default for a parameter name.  This by default
-        looks into the :attr:`default_map` if available.
-        """
-        if self.default_map is not None:
-            rv = self.default_map.get(name)
-            if callable(rv):
-                rv = rv()
-            return rv
-
-    def fail(self, message):
-        """Aborts the execution of the program with a specific error
-        message.
-
-        :param message: the error message to fail with.
-        """
-        raise UsageError(message, self)
-
-    def abort(self):
-        """Aborts the script."""
-        raise Abort()
-
-    def exit(self, code=0):
-        """Exits the application with a given exit code."""
-        raise Exit(code)
-
-    def get_usage(self):
-        """Helper method to get formatted usage string for the current
-        context and command.
-        """
-        return self.command.get_usage(self)
-
-    def get_help(self):
-        """Helper method to get formatted help page for the current
-        context and command.
-        """
-        return self.command.get_help(self)
-
-    def invoke(*args, **kwargs):
-        """Invokes a command callback in exactly the way it expects.  There
-        are two ways to invoke this method:
-
-        1.  the first argument can be a callback and all other arguments and
-            keyword arguments are forwarded directly to the function.
-        2.  the first argument is a click command object.  In that case all
-            arguments are forwarded as well but proper click parameters
-            (options and click arguments) must be keyword arguments and Click
-            will fill in defaults.
-
-        Note that before Click 3.2 keyword arguments were not properly filled
-        in against the intention of this code and no context was created.  For
-        more information about this change and why it was done in a bugfix
-        release see :ref:`upgrade-to-3.2`.
-        """
-        self, callback = args[:2]
-        ctx = self
-
-        # It's also possible to invoke another command which might or
-        # might not have a callback.  In that case we also fill
-        # in defaults and make a new context for this command.
-        if isinstance(callback, Command):
-            other_cmd = callback
-            callback = other_cmd.callback
-            ctx = Context(other_cmd, info_name=other_cmd.name, parent=self)
-            if callback is None:
-                raise TypeError('The given command does not have a '
-                                'callback that can be invoked.')
-
-            for param in other_cmd.params:
-                if param.name not in kwargs and param.expose_value:
-                    kwargs[param.name] = param.get_default(ctx)
-
-        args = args[2:]
-        with augment_usage_errors(self):
-            with ctx:
-                return callback(*args, **kwargs)
-
-    def forward(*args, **kwargs):
-        """Similar to :meth:`invoke` but fills in default keyword
-        arguments from the current context if the other command expects
-        it.  This cannot invoke callbacks directly, only other commands.
-        """
-        self, cmd = args[:2]
-
-        # It's also possible to invoke another command which might or
-        # might not have a callback.
-        if not isinstance(cmd, Command):
-            raise TypeError('Callback is not a command.')
-
-        for param in self.params:
-            if param not in kwargs:
-                kwargs[param] = self.params[param]
-
-        return self.invoke(cmd, **kwargs)
-
-
-class BaseCommand(object):
-    """The base command implements the minimal API contract of commands.
-    Most code will never use this as it does not implement a lot of useful
-    functionality but it can act as the direct subclass of alternative
-    parsing methods that do not depend on the Click parser.
-
-    For instance, this can be used to bridge Click and other systems like
-    argparse or docopt.
-
-    Because base commands do not implement a lot of the API that other
-    parts of Click take for granted, they are not supported for all
-    operations.  For instance, they cannot be used with the decorators
-    usually and they have no built-in callback system.
-
-    .. versionchanged:: 2.0
-       Added the `context_settings` parameter.
-
-    :param name: the name of the command to use unless a group overrides it.
-    :param context_settings: an optional dictionary with defaults that are
-                             passed to the context object.
-    """
-    #: the default for the :attr:`Context.allow_extra_args` flag.
-    allow_extra_args = False
-    #: the default for the :attr:`Context.allow_interspersed_args` flag.
-    allow_interspersed_args = True
-    #: the default for the :attr:`Context.ignore_unknown_options` flag.
-    ignore_unknown_options = False
-
-    def __init__(self, name, context_settings=None):
-        #: the name the command thinks it has.  Upon registering a command
-        #: on a :class:`Group` the group will default the command name
-        #: with this information.  You should instead use the
-        #: :class:`Context`\'s :attr:`~Context.info_name` attribute.
-        self.name = name
-        if context_settings is None:
-            context_settings = {}
-        #: an optional dictionary with defaults passed to the context.
-        self.context_settings = context_settings
-
-    def get_usage(self, ctx):
-        raise NotImplementedError('Base commands cannot get usage')
-
-    def get_help(self, ctx):
-        raise NotImplementedError('Base commands cannot get help')
-
-    def make_context(self, info_name, args, parent=None, **extra):
-        """This function when given an info name and arguments will kick
-        off the parsing and create a new :class:`Context`.  It does not
-        invoke the actual command callback though.
-
-        :param info_name: the info name for this invokation.  Generally this
-                          is the most descriptive name for the script or
-                          command.  For the toplevel script it's usually
-                          the name of the script, for commands below it it's
-                          the name of the script.
-        :param args: the arguments to parse as list of strings.
-        :param parent: the parent context if available.
-        :param extra: extra keyword arguments forwarded to the context
-                      constructor.
-        """
-        for key, value in iteritems(self.context_settings):
-            if key not in extra:
-                extra[key] = value
-        ctx = Context(self, info_name=info_name, parent=parent, **extra)
-        with ctx.scope(cleanup=False):
-            self.parse_args(ctx, args)
-        return ctx
-
-    def parse_args(self, ctx, args):
-        """Given a context and a list of arguments this creates the parser
-        and parses the arguments, then modifies the context as necessary.
-        This is automatically invoked by :meth:`make_context`.
-        """
-        raise NotImplementedError('Base commands do not know how to parse '
-                                  'arguments.')
-
-    def invoke(self, ctx):
-        """Given a context, this invokes the command.  The default
-        implementation is raising a not implemented error.
-        """
-        raise NotImplementedError('Base commands are not invokable by default')
-
-    def main(self, args=None, prog_name=None, complete_var=None,
-             standalone_mode=True, **extra):
-        """This is the way to invoke a script with all the bells and
-        whistles as a command line application.  This will always terminate
-        the application after a call.  If this is not wanted, ``SystemExit``
-        needs to be caught.
-
-        This method is also available by directly calling the instance of
-        a :class:`Command`.
-
-        .. versionadded:: 3.0
-           Added the `standalone_mode` flag to control the standalone mode.
-
-        :param args: the arguments that should be used for parsing.  If not
-                     provided, ``sys.argv[1:]`` is used.
-        :param prog_name: the program name that should be used.  By default
-                          the program name is constructed by taking the file
-                          name from ``sys.argv[0]``.
-        :param complete_var: the environment variable that controls the
-                             bash completion support.  The default is
-                             ``"_<prog_name>_COMPLETE"`` with prog_name in
-                             uppercase.
-        :param standalone_mode: the default behavior is to invoke the script
-                                in standalone mode.  Click will then
-                                handle exceptions and convert them into
-                                error messages and the function will never
-                                return but shut down the interpreter.  If
-                                this is set to `False` they will be
-                                propagated to the caller and the return
-                                value of this function is the return value
-                                of :meth:`invoke`.
-        :param extra: extra keyword arguments are forwarded to the context
-                      constructor.  See :class:`Context` for more information.
-        """
-        # If we are in Python 3, we will verify that the environment is
-        # sane at this point or reject further execution to avoid a
-        # broken script.
-        if not PY2:
-            _verify_python3_env()
-        else:
-            _check_for_unicode_literals()
-
-        if args is None:
-            args = get_os_args()
-        else:
-            args = list(args)
-
-        if prog_name is None:
-            prog_name = make_str(os.path.basename(
-                sys.argv and sys.argv[0] or __file__))
-
-        # Hook for the Bash completion.  This only activates if the Bash
-        # completion is actually enabled, otherwise this is quite a fast
-        # noop.
-        _bashcomplete(self, prog_name, complete_var)
-
-        try:
-            try:
-                with self.make_context(prog_name, args, **extra) as ctx:
-                    rv = self.invoke(ctx)
-                    if not standalone_mode:
-                        return rv
-                    # it's not safe to `ctx.exit(rv)` here!
-                    # note that `rv` may actually contain data like "1" which
-                    # has obvious effects
-                    # more subtle case: `rv=[None, None]` can come out of
-                    # chained commands which all returned `None` -- so it's not
-                    # even always obvious that `rv` indicates success/failure
-                    # by its truthiness/falsiness
-                    ctx.exit()
-            except (EOFError, KeyboardInterrupt):
-                echo(file=sys.stderr)
-                raise Abort()
-            except ClickException as e:
-                if not standalone_mode:
-                    raise
-                e.show()
-                sys.exit(e.exit_code)
-            except IOError as e:
-                if e.errno == errno.EPIPE:
-                    sys.stdout = PacifyFlushWrapper(sys.stdout)
-                    sys.stderr = PacifyFlushWrapper(sys.stderr)
-                    sys.exit(1)
-                else:
-                    raise
-        except Exit as e:
-            if standalone_mode:
-                sys.exit(e.exit_code)
-            else:
-                # in non-standalone mode, return the exit code
-                # note that this is only reached if `self.invoke` above raises
-                # an Exit explicitly -- thus bypassing the check there which
-                # would return its result
-                # the results of non-standalone execution may therefore be
-                # somewhat ambiguous: if there are codepaths which lead to
-                # `ctx.exit(1)` and to `return 1`, the caller won't be able to
-                # tell the difference between the two
-                return e.exit_code
-        except Abort:
-            if not standalone_mode:
-                raise
-            echo('Aborted!', file=sys.stderr)
-            sys.exit(1)
-
-    def __call__(self, *args, **kwargs):
-        """Alias for :meth:`main`."""
-        return self.main(*args, **kwargs)
-
-
-class Command(BaseCommand):
-    """Commands are the basic building block of command line interfaces in
-    Click.  A basic command handles command line parsing and might dispatch
-    more parsing to commands nested below it.
-
-    .. versionchanged:: 2.0
-       Added the `context_settings` parameter.
-
-    :param name: the name of the command to use unless a group overrides it.
-    :param context_settings: an optional dictionary with defaults that are
-                             passed to the context object.
-    :param callback: the callback to invoke.  This is optional.
-    :param params: the parameters to register with this command.  This can
-                   be either :class:`Option` or :class:`Argument` objects.
-    :param help: the help string to use for this command.
-    :param epilog: like the help string but it's printed at the end of the
-                   help page after everything else.
-    :param short_help: the short help to use for this command.  This is
-                       shown on the command listing of the parent command.
-    :param add_help_option: by default each command registers a ``--help``
-                            option.  This can be disabled by this parameter.
-    :param hidden: hide this command from help outputs.
-
-    :param deprecated: issues a message indicating that
-                             the command is deprecated.
-    """
-
-    def __init__(self, name, context_settings=None, callback=None,
-                 params=None, help=None, epilog=None, short_help=None,
-                 options_metavar='[OPTIONS]', add_help_option=True,
-                 hidden=False, deprecated=False):
-        BaseCommand.__init__(self, name, context_settings)
-        #: the callback to execute when the command fires.  This might be
-        #: `None` in which case nothing happens.
-        self.callback = callback
-        #: the list of parameters for this command in the order they
-        #: should show up in the help page and execute.  Eager parameters
-        #: will automatically be handled before non eager ones.
-        self.params = params or []
-        # if a form feed (page break) is found in the help text, truncate help
-        # text to the content preceding the first form feed
-        if help and '\f' in help:
-            help = help.split('\f', 1)[0]
-        self.help = help
-        self.epilog = epilog
-        self.options_metavar = options_metavar
-        self.short_help = short_help
-        self.add_help_option = add_help_option
-        self.hidden = hidden
-        self.deprecated = deprecated
-
-    def get_usage(self, ctx):
-        formatter = ctx.make_formatter()
-        self.format_usage(ctx, formatter)
-        return formatter.getvalue().rstrip('\n')
-
-    def get_params(self, ctx):
-        rv = self.params
-        help_option = self.get_help_option(ctx)
-        if help_option is not None:
-            rv = rv + [help_option]
-        return rv
-
-    def format_usage(self, ctx, formatter):
-        """Writes the usage line into the formatter."""
-        pieces = self.collect_usage_pieces(ctx)
-        formatter.write_usage(ctx.command_path, ' '.join(pieces))
-
-    def collect_usage_pieces(self, ctx):
-        """Returns all the pieces that go into the usage line and returns
-        it as a list of strings.
-        """
-        rv = [self.options_metavar]
-        for param in self.get_params(ctx):
-            rv.extend(param.get_usage_pieces(ctx))
-        return rv
-
-    def get_help_option_names(self, ctx):
-        """Returns the names for the help option."""
-        all_names = set(ctx.help_option_names)
-        for param in self.params:
-            all_names.difference_update(param.opts)
-            all_names.difference_update(param.secondary_opts)
-        return all_names
-
-    def get_help_option(self, ctx):
-        """Returns the help option object."""
-        help_options = self.get_help_option_names(ctx)
-        if not help_options or not self.add_help_option:
-            return
-
-        def show_help(ctx, param, value):
-            if value and not ctx.resilient_parsing:
-                echo(ctx.get_help(), color=ctx.color)
-                ctx.exit()
-        return Option(help_options, is_flag=True,
-                      is_eager=True, expose_value=False,
-                      callback=show_help,
-                      help='Show this message and exit.')
-
-    def make_parser(self, ctx):
-        """Creates the underlying option parser for this command."""
-        parser = OptionParser(ctx)
-        for param in self.get_params(ctx):
-            param.add_to_parser(parser, ctx)
-        return parser
-
-    def get_help(self, ctx):
-        """Formats the help into a string and returns it.  This creates a
-        formatter and will call into the following formatting methods:
-        """
-        formatter = ctx.make_formatter()
-        self.format_help(ctx, formatter)
-        return formatter.getvalue().rstrip('\n')
-
-    def get_short_help_str(self, limit=45):
-        """Gets short help for the command or makes it by shortening the long help string."""
-        return self.short_help or self.help and make_default_short_help(self.help, limit) or ''
-
-    def format_help(self, ctx, formatter):
-        """Writes the help into the formatter if it exists.
-
-        This calls into the following methods:
-
-        -   :meth:`format_usage`
-        -   :meth:`format_help_text`
-        -   :meth:`format_options`
-        -   :meth:`format_epilog`
-        """
-        self.format_usage(ctx, formatter)
-        self.format_help_text(ctx, formatter)
-        self.format_options(ctx, formatter)
-        self.format_epilog(ctx, formatter)
-
-    def format_help_text(self, ctx, formatter):
-        """Writes the help text to the formatter if it exists."""
-        if self.help:
-            formatter.write_paragraph()
-            with formatter.indentation():
-                help_text = self.help
-                if self.deprecated:
-                    help_text += DEPRECATED_HELP_NOTICE
-                formatter.write_text(help_text)
-        elif self.deprecated:
-            formatter.write_paragraph()
-            with formatter.indentation():
-                formatter.write_text(DEPRECATED_HELP_NOTICE)
-
-    def format_options(self, ctx, formatter):
-        """Writes all the options into the formatter if they exist."""
-        opts = []
-        for param in self.get_params(ctx):
-            rv = param.get_help_record(ctx)
-            if rv is not None:
-                opts.append(rv)
-
-        if opts:
-            with formatter.section('Options'):
-                formatter.write_dl(opts)
-
-    def format_epilog(self, ctx, formatter):
-        """Writes the epilog into the formatter if it exists."""
-        if self.epilog:
-            formatter.write_paragraph()
-            with formatter.indentation():
-                formatter.write_text(self.epilog)
-
-    def parse_args(self, ctx, args):
-        parser = self.make_parser(ctx)
-        opts, args, param_order = parser.parse_args(args=args)
-
-        for param in iter_params_for_processing(
-                param_order, self.get_params(ctx)):
-            value, args = param.handle_parse_result(ctx, opts, args)
-
-        if args and not ctx.allow_extra_args and not ctx.resilient_parsing:
-            ctx.fail('Got unexpected extra argument%s (%s)'
-                     % (len(args) != 1 and 's' or '',
-                        ' '.join(map(make_str, args))))
-
-        ctx.args = args
-        return args
-
-    def invoke(self, ctx):
-        """Given a context, this invokes the attached callback (if it exists)
-        in the right way.
-        """
-        _maybe_show_deprecated_notice(self)
-        if self.callback is not None:
-            return ctx.invoke(self.callback, **ctx.params)
-
-
-class MultiCommand(Command):
-    """A multi command is the basic implementation of a command that
-    dispatches to subcommands.  The most common version is the
-    :class:`Group`.
-
-    :param invoke_without_command: this controls how the multi command itself
-                                   is invoked.  By default it's only invoked
-                                   if a subcommand is provided.
-    :param no_args_is_help: this controls what happens if no arguments are
-                            provided.  This option is enabled by default if
-                            `invoke_without_command` is disabled or disabled
-                            if it's enabled.  If enabled this will add
-                            ``--help`` as argument if no arguments are
-                            passed.
-    :param subcommand_metavar: the string that is used in the documentation
-                               to indicate the subcommand place.
-    :param chain: if this is set to `True` chaining of multiple subcommands
-                  is enabled.  This restricts the form of commands in that
-                  they cannot have optional arguments but it allows
-                  multiple commands to be chained together.
-    :param result_callback: the result callback to attach to this multi
-                            command.
-    """
-    allow_extra_args = True
-    allow_interspersed_args = False
-
-    def __init__(self, name=None, invoke_without_command=False,
-                 no_args_is_help=None, subcommand_metavar=None,
-                 chain=False, result_callback=None, **attrs):
-        Command.__init__(self, name, **attrs)
-        if no_args_is_help is None:
-            no_args_is_help = not invoke_without_command
-        self.no_args_is_help = no_args_is_help
-        self.invoke_without_command = invoke_without_command
-        if subcommand_metavar is None:
-            if chain:
-                subcommand_metavar = SUBCOMMANDS_METAVAR
-            else:
-                subcommand_metavar = SUBCOMMAND_METAVAR
-        self.subcommand_metavar = subcommand_metavar
-        self.chain = chain
-        #: The result callback that is stored.  This can be set or
-        #: overridden with the :func:`resultcallback` decorator.
-        self.result_callback = result_callback
-
-        if self.chain:
-            for param in self.params:
-                if isinstance(param, Argument) and not param.required:
-                    raise RuntimeError('Multi commands in chain mode cannot '
-                                       'have optional arguments.')
-
-    def collect_usage_pieces(self, ctx):
-        rv = Command.collect_usage_pieces(self, ctx)
-        rv.append(self.subcommand_metavar)
-        return rv
-
-    def format_options(self, ctx, formatter):
-        Command.format_options(self, ctx, formatter)
-        self.format_commands(ctx, formatter)
-
-    def resultcallback(self, replace=False):
-        """Adds a result callback to the chain command.  By default if a
-        result callback is already registered this will chain them but
-        this can be disabled with the `replace` parameter.  The result
-        callback is invoked with the return value of the subcommand
-        (or the list of return values from all subcommands if chaining
-        is enabled) as well as the parameters as they would be passed
-        to the main callback.
-
-        Example::
-
-            @click.group()
-            @click.option('-i', '--input', default=23)
-            def cli(input):
-                return 42
-
-            @cli.resultcallback()
-            def process_result(result, input):
-                return result + input
-
-        .. versionadded:: 3.0
-
-        :param replace: if set to `True` an already existing result
-                        callback will be removed.
-        """
-        def decorator(f):
-            old_callback = self.result_callback
-            if old_callback is None or replace:
-                self.result_callback = f
-                return f
-            def function(__value, *args, **kwargs):
-                return f(old_callback(__value, *args, **kwargs),
-                         *args, **kwargs)
-            self.result_callback = rv = update_wrapper(function, f)
-            return rv
-        return decorator
-
-    def format_commands(self, ctx, formatter):
-        """Extra format methods for multi methods that adds all the commands
-        after the options.
-        """
-        commands = []
-        for subcommand in self.list_commands(ctx):
-            cmd = self.get_command(ctx, subcommand)
-            # What is this, the tool lied about a command.  Ignore it
-            if cmd is None:
-                continue
-            if cmd.hidden:
-                continue
-
-            commands.append((subcommand, cmd))
-
-        # allow for 3 times the default spacing
-        if len(commands):
-            limit = formatter.width - 6 - max(len(cmd[0]) for cmd in commands)
-
-            rows = []
-            for subcommand, cmd in commands:
-                help = cmd.get_short_help_str(limit)
-                rows.append((subcommand, help))
-
-            if rows:
-                with formatter.section('Commands'):
-                    formatter.write_dl(rows)
-
-    def parse_args(self, ctx, args):
-        if not args and self.no_args_is_help and not ctx.resilient_parsing:
-            echo(ctx.get_help(), color=ctx.color)
-            ctx.exit()
-
-        rest = Command.parse_args(self, ctx, args)
-        if self.chain:
-            ctx.protected_args = rest
-            ctx.args = []
-        elif rest:
-            ctx.protected_args, ctx.args = rest[:1], rest[1:]
-
-        return ctx.args
-
-    def invoke(self, ctx):
-        def _process_result(value):
-            if self.result_callback is not None:
-                value = ctx.invoke(self.result_callback, value,
-                                   **ctx.params)
-            return value
-
-        if not ctx.protected_args:
-            # If we are invoked without command the chain flag controls
-            # how this happens.  If we are not in chain mode, the return
-            # value here is the return value of the command.
-            # If however we are in chain mode, the return value is the
-            # return value of the result processor invoked with an empty
-            # list (which means that no subcommand actually was executed).
-            if self.invoke_without_command:
-                if not self.chain:
-                    return Command.invoke(self, ctx)
-                with ctx:
-                    Command.invoke(self, ctx)
-                    return _process_result([])
-            ctx.fail('Missing command.')
-
-        # Fetch args back out
-        args = ctx.protected_args + ctx.args
-        ctx.args = []
-        ctx.protected_args = []
-
-        # If we're not in chain mode, we only allow the invocation of a
-        # single command but we also inform the current context about the
-        # name of the command to invoke.
-        if not self.chain:
-            # Make sure the context is entered so we do not clean up
-            # resources until the result processor has worked.
-            with ctx:
-                cmd_name, cmd, args = self.resolve_command(ctx, args)
-                ctx.invoked_subcommand = cmd_name
-                Command.invoke(self, ctx)
-                sub_ctx = cmd.make_context(cmd_name, args, parent=ctx)
-                with sub_ctx:
-                    return _process_result(sub_ctx.command.invoke(sub_ctx))
-
-        # In chain mode we create the contexts step by step, but after the
-        # base command has been invoked.  Because at that point we do not
-        # know the subcommands yet, the invoked subcommand attribute is
-        # set to ``*`` to inform the command that subcommands are executed
-        # but nothing else.
-        with ctx:
-            ctx.invoked_subcommand = args and '*' or None
-            Command.invoke(self, ctx)
-
-            # Otherwise we make every single context and invoke them in a
-            # chain.  In that case the return value to the result processor
-            # is the list of all invoked subcommand's results.
-            contexts = []
-            while args:
-                cmd_name, cmd, args = self.resolve_command(ctx, args)
-                sub_ctx = cmd.make_context(cmd_name, args, parent=ctx,
-                                           allow_extra_args=True,
-                                           allow_interspersed_args=False)
-                contexts.append(sub_ctx)
-                args, sub_ctx.args = sub_ctx.args, []
-
-            rv = []
-            for sub_ctx in contexts:
-                with sub_ctx:
-                    rv.append(sub_ctx.command.invoke(sub_ctx))
-            return _process_result(rv)
-
-    def resolve_command(self, ctx, args):
-        cmd_name = make_str(args[0])
-        original_cmd_name = cmd_name
-
-        # Get the command
-        cmd = self.get_command(ctx, cmd_name)
-
-        # If we can't find the command but there is a normalization
-        # function available, we try with that one.
-        if cmd is None and ctx.token_normalize_func is not None:
-            cmd_name = ctx.token_normalize_func(cmd_name)
-            cmd = self.get_command(ctx, cmd_name)
-
-        # If we don't find the command we want to show an error message
-        # to the user that it was not provided.  However, there is
-        # something else we should do: if the first argument looks like
-        # an option we want to kick off parsing again for arguments to
-        # resolve things like --help which now should go to the main
-        # place.
-        if cmd is None and not ctx.resilient_parsing:
-            if split_opt(cmd_name)[0]:
-                self.parse_args(ctx, ctx.args)
-            ctx.fail('No such command "%s".' % original_cmd_name)
-
-        return cmd_name, cmd, args[1:]
-
-    def get_command(self, ctx, cmd_name):
-        """Given a context and a command name, this returns a
-        :class:`Command` object if it exists or returns `None`.
-        """
-        raise NotImplementedError()
-
-    def list_commands(self, ctx):
-        """Returns a list of subcommand names in the order they should
-        appear.
-        """
-        return []
-
-
-class Group(MultiCommand):
-    """A group allows a command to have subcommands attached.  This is the
-    most common way to implement nesting in Click.
-
-    :param commands: a dictionary of commands.
-    """
-
-    def __init__(self, name=None, commands=None, **attrs):
-        MultiCommand.__init__(self, name, **attrs)
-        #: the registered subcommands by their exported names.
-        self.commands = commands or {}
-
-    def add_command(self, cmd, name=None):
-        """Registers another :class:`Command` with this group.  If the name
-        is not provided, the name of the command is used.
-        """
-        name = name or cmd.name
-        if name is None:
-            raise TypeError('Command has no name.')
-        _check_multicommand(self, name, cmd, register=True)
-        self.commands[name] = cmd
-
-    def command(self, *args, **kwargs):
-        """A shortcut decorator for declaring and attaching a command to
-        the group.  This takes the same arguments as :func:`command` but
-        immediately registers the created command with this instance by
-        calling into :meth:`add_command`.
-        """
-        def decorator(f):
-            cmd = command(*args, **kwargs)(f)
-            self.add_command(cmd)
-            return cmd
-        return decorator
-
-    def group(self, *args, **kwargs):
-        """A shortcut decorator for declaring and attaching a group to
-        the group.  This takes the same arguments as :func:`group` but
-        immediately registers the created command with this instance by
-        calling into :meth:`add_command`.
-        """
-        def decorator(f):
-            cmd = group(*args, **kwargs)(f)
-            self.add_command(cmd)
-            return cmd
-        return decorator
-
-    def get_command(self, ctx, cmd_name):
-        return self.commands.get(cmd_name)
-
-    def list_commands(self, ctx):
-        return sorted(self.commands)
-
-
-class CommandCollection(MultiCommand):
-    """A command collection is a multi command that merges multiple multi
-    commands together into one.  This is a straightforward implementation
-    that accepts a list of different multi commands as sources and
-    provides all the commands for each of them.
-    """
-
-    def __init__(self, name=None, sources=None, **attrs):
-        MultiCommand.__init__(self, name, **attrs)
-        #: The list of registered multi commands.
-        self.sources = sources or []
-
-    def add_source(self, multi_cmd):
-        """Adds a new multi command to the chain dispatcher."""
-        self.sources.append(multi_cmd)
-
-    def get_command(self, ctx, cmd_name):
-        for source in self.sources:
-            rv = source.get_command(ctx, cmd_name)
-            if rv is not None:
-                if self.chain:
-                    _check_multicommand(self, cmd_name, rv)
-                return rv
-
-    def list_commands(self, ctx):
-        rv = set()
-        for source in self.sources:
-            rv.update(source.list_commands(ctx))
-        return sorted(rv)
-
-
-class Parameter(object):
-    r"""A parameter to a command comes in two versions: they are either
-    :class:`Option`\s or :class:`Argument`\s.  Other subclasses are currently
-    not supported by design as some of the internals for parsing are
-    intentionally not finalized.
-
-    Some settings are supported by both options and arguments.
-
-    .. versionchanged:: 2.0
-       Changed signature for parameter callback to also be passed the
-       parameter.  In Click 2.0, the old callback format will still work,
-       but it will raise a warning to give you change to migrate the
-       code easier.
-
-    :param param_decls: the parameter declarations for this option or
-                        argument.  This is a list of flags or argument
-                        names.
-    :param type: the type that should be used.  Either a :class:`ParamType`
-                 or a Python type.  The later is converted into the former
-                 automatically if supported.
-    :param required: controls if this is optional or not.
-    :param default: the default value if omitted.  This can also be a callable,
-                    in which case it's invoked when the default is needed
-                    without any arguments.
-    :param callback: a callback that should be executed after the parameter
-                     was matched.  This is called as ``fn(ctx, param,
-                     value)`` and needs to return the value.  Before Click
-                     2.0, the signature was ``(ctx, value)``.
-    :param nargs: the number of arguments to match.  If not ``1`` the return
-                  value is a tuple instead of single value.  The default for
-                  nargs is ``1`` (except if the type is a tuple, then it's
-                  the arity of the tuple).
-    :param metavar: how the value is represented in the help page.
-    :param expose_value: if this is `True` then the value is passed onwards
-                         to the command callback and stored on the context,
-                         otherwise it's skipped.
-    :param is_eager: eager values are processed before non eager ones.  This
-                     should not be set for arguments or it will inverse the
-                     order of processing.
-    :param envvar: a string or list of strings that are environment variables
-                   that should be checked.
-    """
-    param_type_name = 'parameter'
-
-    def __init__(self, param_decls=None, type=None, required=False,
-                 default=None, callback=None, nargs=None, metavar=None,
-                 expose_value=True, is_eager=False, envvar=None,
-                 autocompletion=None):
-        self.name, self.opts, self.secondary_opts = \
-            self._parse_decls(param_decls or (), expose_value)
-
-        self.type = convert_type(type, default)
-
-        # Default nargs to what the type tells us if we have that
-        # information available.
-        if nargs is None:
-            if self.type.is_composite:
-                nargs = self.type.arity
-            else:
-                nargs = 1
-
-        self.required = required
-        self.callback = callback
-        self.nargs = nargs
-        self.multiple = False
-        self.expose_value = expose_value
-        self.default = default
-        self.is_eager = is_eager
-        self.metavar = metavar
-        self.envvar = envvar
-        self.autocompletion = autocompletion
-
-    @property
-    def human_readable_name(self):
-        """Returns the human readable name of this parameter.  This is the
-        same as the name for options, but the metavar for arguments.
-        """
-        return self.name
-
-    def make_metavar(self):
-        if self.metavar is not None:
-            return self.metavar
-        metavar = self.type.get_metavar(self)
-        if metavar is None:
-            metavar = self.type.name.upper()
-        if self.nargs != 1:
-            metavar += '...'
-        return metavar
-
-    def get_default(self, ctx):
-        """Given a context variable this calculates the default value."""
-        # Otherwise go with the regular default.
-        if callable(self.default):
-            rv = self.default()
-        else:
-            rv = self.default
-        return self.type_cast_value(ctx, rv)
-
-    def add_to_parser(self, parser, ctx):
-        pass
-
-    def consume_value(self, ctx, opts):
-        value = opts.get(self.name)
-        if value is None:
-            value = self.value_from_envvar(ctx)
-        if value is None:
-            value = ctx.lookup_default(self.name)
-        return value
-
-    def type_cast_value(self, ctx, value):
-        """Given a value this runs it properly through the type system.
-        This automatically handles things like `nargs` and `multiple` as
-        well as composite types.
-        """
-        if self.type.is_composite:
-            if self.nargs <= 1:
-                raise TypeError('Attempted to invoke composite type '
-                                'but nargs has been set to %s.  This is '
-                                'not supported; nargs needs to be set to '
-                                'a fixed value > 1.' % self.nargs)
-            if self.multiple:
-                return tuple(self.type(x or (), self, ctx) for x in value or ())
-            return self.type(value or (), self, ctx)
-
-        def _convert(value, level):
-            if level == 0:
-                return self.type(value, self, ctx)
-            return tuple(_convert(x, level - 1) for x in value or ())
-        return _convert(value, (self.nargs != 1) + bool(self.multiple))
-
-    def process_value(self, ctx, value):
-        """Given a value and context this runs the logic to convert the
-        value as necessary.
-        """
-        # If the value we were given is None we do nothing.  This way
-        # code that calls this can easily figure out if something was
-        # not provided.  Otherwise it would be converted into an empty
-        # tuple for multiple invocations which is inconvenient.
-        if value is not None:
-            return self.type_cast_value(ctx, value)
-
-    def value_is_missing(self, value):
-        if value is None:
-            return True
-        if (self.nargs != 1 or self.multiple) and value == ():
-            return True
-        return False
-
-    def full_process_value(self, ctx, value):
-        value = self.process_value(ctx, value)
-
-        if value is None and not ctx.resilient_parsing:
-            value = self.get_default(ctx)
-
-        if self.required and self.value_is_missing(value):
-            raise MissingParameter(ctx=ctx, param=self)
-
-        return value
-
-    def resolve_envvar_value(self, ctx):
-        if self.envvar is None:
-            return
-        if isinstance(self.envvar, (tuple, list)):
-            for envvar in self.envvar:
-                rv = os.environ.get(envvar)
-                if rv is not None:
-                    return rv
-        else:
-            return os.environ.get(self.envvar)
-
-    def value_from_envvar(self, ctx):
-        rv = self.resolve_envvar_value(ctx)
-        if rv is not None and self.nargs != 1:
-            rv = self.type.split_envvar_value(rv)
-        return rv
-
-    def handle_parse_result(self, ctx, opts, args):
-        with augment_usage_errors(ctx, param=self):
-            value = self.consume_value(ctx, opts)
-            try:
-                value = self.full_process_value(ctx, value)
-            except Exception:
-                if not ctx.resilient_parsing:
-                    raise
-                value = None
-            if self.callback is not None:
-                try:
-                    value = invoke_param_callback(
-                        self.callback, ctx, self, value)
-                except Exception:
-                    if not ctx.resilient_parsing:
-                        raise
-
-        if self.expose_value:
-            ctx.params[self.name] = value
-        return value, args
-
-    def get_help_record(self, ctx):
-        pass
-
-    def get_usage_pieces(self, ctx):
-        return []
-
-    def get_error_hint(self, ctx):
-        """Get a stringified version of the param for use in error messages to
-        indicate which param caused the error.
-        """
-        hint_list = self.opts or [self.human_readable_name]
-        return ' / '.join('"%s"' % x for x in hint_list)
-
-
-class Option(Parameter):
-    """Options are usually optional values on the command line and
-    have some extra features that arguments don't have.
-
-    All other parameters are passed onwards to the parameter constructor.
-
-    :param show_default: controls if the default value should be shown on the
-                         help page. Normally, defaults are not shown. If this
-                         value is a string, it shows the string instead of the
-                         value. This is particularly useful for dynamic options.
-    :param show_envvar: controls if an environment variable should be shown on
-                        the help page.  Normally, environment variables
-                        are not shown.
-    :param prompt: if set to `True` or a non empty string then the user will be
-                   prompted for input.  If set to `True` the prompt will be the
-                   option name capitalized.
-    :param confirmation_prompt: if set then the value will need to be confirmed
-                                if it was prompted for.
-    :param hide_input: if this is `True` then the input on the prompt will be
-                       hidden from the user.  This is useful for password
-                       input.
-    :param is_flag: forces this option to act as a flag.  The default is
-                    auto detection.
-    :param flag_value: which value should be used for this flag if it's
-                       enabled.  This is set to a boolean automatically if
-                       the option string contains a slash to mark two options.
-    :param multiple: if this is set to `True` then the argument is accepted
-                     multiple times and recorded.  This is similar to ``nargs``
-                     in how it works but supports arbitrary number of
-                     arguments.
-    :param count: this flag makes an option increment an integer.
-    :param allow_from_autoenv: if this is enabled then the value of this
-                               parameter will be pulled from an environment
-                               variable in case a prefix is defined on the
-                               context.
-    :param help: the help string.
-    :param hidden: hide this option from help outputs.
-    """
-    param_type_name = 'option'
-
-    def __init__(self, param_decls=None, show_default=False,
-                 prompt=False, confirmation_prompt=False,
-                 hide_input=False, is_flag=None, flag_value=None,
-                 multiple=False, count=False, allow_from_autoenv=True,
-                 type=None, help=None, hidden=False, show_choices=True,
-                 show_envvar=False, **attrs):
-        default_is_missing = attrs.get('default', _missing) is _missing
-        Parameter.__init__(self, param_decls, type=type, **attrs)
-
-        if prompt is True:
-            prompt_text = self.name.replace('_', ' ').capitalize()
-        elif prompt is False:
-            prompt_text = None
-        else:
-            prompt_text = prompt
-        self.prompt = prompt_text
-        self.confirmation_prompt = confirmation_prompt
-        self.hide_input = hide_input
-        self.hidden = hidden
-
-        # Flags
-        if is_flag is None:
-            if flag_value is not None:
-                is_flag = True
-            else:
-                is_flag = bool(self.secondary_opts)
-        if is_flag and default_is_missing:
-            self.default = False
-        if flag_value is None:
-            flag_value = not self.default
-        self.is_flag = is_flag
-        self.flag_value = flag_value
-        if self.is_flag and isinstance(self.flag_value, bool) \
-           and type is None:
-            self.type = BOOL
-            self.is_bool_flag = True
-        else:
-            self.is_bool_flag = False
-
-        # Counting
-        self.count = count
-        if count:
-            if type is None:
-                self.type = IntRange(min=0)
-            if default_is_missing:
-                self.default = 0
-
-        self.multiple = multiple
-        self.allow_from_autoenv = allow_from_autoenv
-        self.help = help
-        self.show_default = show_default
-        self.show_choices = show_choices
-        self.show_envvar = show_envvar
-
-        # Sanity check for stuff we don't support
-        if __debug__:
-            if self.nargs < 0:
-                raise TypeError('Options cannot have nargs < 0')
-            if self.prompt and self.is_flag and not self.is_bool_flag:
-                raise TypeError('Cannot prompt for flags that are not bools.')
-            if not self.is_bool_flag and self.secondary_opts:
-                raise TypeError('Got secondary option for non boolean flag.')
-            if self.is_bool_flag and self.hide_input \
-               and self.prompt is not None:
-                raise TypeError('Hidden input does not work with boolean '
-                                'flag prompts.')
-            if self.count:
-                if self.multiple:
-                    raise TypeError('Options cannot be multiple and count '
-                                    'at the same time.')
-                elif self.is_flag:
-                    raise TypeError('Options cannot be count and flags at '
-                                    'the same time.')
-
-    def _parse_decls(self, decls, expose_value):
-        opts = []
-        secondary_opts = []
-        name = None
-        possible_names = []
-
-        for decl in decls:
-            if isidentifier(decl):
-                if name is not None:
-                    raise TypeError('Name defined twice')
-                name = decl
-            else:
-                split_char = decl[:1] == '/' and ';' or '/'
-                if split_char in decl:
-                    first, second = decl.split(split_char, 1)
-                    first = first.rstrip()
-                    if first:
-                        possible_names.append(split_opt(first))
-                        opts.append(first)
-                    second = second.lstrip()
-                    if second:
-                        secondary_opts.append(second.lstrip())
-                else:
-                    possible_names.append(split_opt(decl))
-                    opts.append(decl)
-
-        if name is None and possible_names:
-            possible_names.sort(key=lambda x: -len(x[0]))  # group long options first
-            name = possible_names[0][1].replace('-', '_').lower()
-            if not isidentifier(name):
-                name = None
-
-        if name is None:
-            if not expose_value:
-                return None, opts, secondary_opts
-            raise TypeError('Could not determine name for option')
-
-        if not opts and not secondary_opts:
-            raise TypeError('No options defined but a name was passed (%s). '
-                            'Did you mean to declare an argument instead '
-                            'of an option?' % name)
-
-        return name, opts, secondary_opts
-
-    def add_to_parser(self, parser, ctx):
-        kwargs = {
-            'dest': self.name,
-            'nargs': self.nargs,
-            'obj': self,
-        }
-
-        if self.multiple:
-            action = 'append'
-        elif self.count:
-            action = 'count'
-        else:
-            action = 'store'
-
-        if self.is_flag:
-            kwargs.pop('nargs', None)
-            if self.is_bool_flag and self.secondary_opts:
-                parser.add_option(self.opts, action=action + '_const',
-                                  const=True, **kwargs)
-                parser.add_option(self.secondary_opts, action=action +
-                                  '_const', const=False, **kwargs)
-            else:
-                parser.add_option(self.opts, action=action + '_const',
-                                  const=self.flag_value,
-                                  **kwargs)
-        else:
-            kwargs['action'] = action
-            parser.add_option(self.opts, **kwargs)
-
-    def get_help_record(self, ctx):
-        if self.hidden:
-            return
-        any_prefix_is_slash = []
-
-        def _write_opts(opts):
-            rv, any_slashes = join_options(opts)
-            if any_slashes:
-                any_prefix_is_slash[:] = [True]
-            if not self.is_flag and not self.count:
-                rv += ' ' + self.make_metavar()
-            return rv
-
-        rv = [_write_opts(self.opts)]
-        if self.secondary_opts:
-            rv.append(_write_opts(self.secondary_opts))
-
-        help = self.help or ''
-        extra = []
-        if self.show_envvar:
-            envvar = self.envvar
-            if envvar is None:
-                if self.allow_from_autoenv and \
-                    ctx.auto_envvar_prefix is not None:
-                    envvar = '%s_%s' % (ctx.auto_envvar_prefix, self.name.upper())
-            if envvar is not None:
-              extra.append('env var: %s' % (
-                           ', '.join('%s' % d for d in envvar)
-                           if isinstance(envvar, (list, tuple))
-                           else envvar, ))
-        if self.default is not None and self.show_default:
-            if isinstance(self.show_default, string_types):
-                default_string = '({})'.format(self.show_default)
-            elif isinstance(self.default, (list, tuple)):
-                default_string = ', '.join('%s' % d for d in self.default)
-            elif inspect.isfunction(self.default):
-                default_string = "(dynamic)"
-            else:
-                default_string = self.default
-            extra.append('default: {}'.format(default_string))
-
-        if self.required:
-            extra.append('required')
-        if extra:
-            help = '%s[%s]' % (help and help + '  ' or '', '; '.join(extra))
-
-        return ((any_prefix_is_slash and '; ' or ' / ').join(rv), help)
-
-    def get_default(self, ctx):
-        # If we're a non boolean flag out default is more complex because
-        # we need to look at all flags in the same group to figure out
-        # if we're the the default one in which case we return the flag
-        # value as default.
-        if self.is_flag and not self.is_bool_flag:
-            for param in ctx.command.params:
-                if param.name == self.name and param.default:
-                    return param.flag_value
-            return None
-        return Parameter.get_default(self, ctx)
-
-    def prompt_for_value(self, ctx):
-        """This is an alternative flow that can be activated in the full
-        value processing if a value does not exist.  It will prompt the
-        user until a valid value exists and then returns the processed
-        value as result.
-        """
-        # Calculate the default before prompting anything to be stable.
-        default = self.get_default(ctx)
-
-        # If this is a prompt for a flag we need to handle this
-        # differently.
-        if self.is_bool_flag:
-            return confirm(self.prompt, default)
-
-        return prompt(self.prompt, default=default, type=self.type,
-                      hide_input=self.hide_input, show_choices=self.show_choices,
-                      confirmation_prompt=self.confirmation_prompt,
-                      value_proc=lambda x: self.process_value(ctx, x))
-
-    def resolve_envvar_value(self, ctx):
-        rv = Parameter.resolve_envvar_value(self, ctx)
-        if rv is not None:
-            return rv
-        if self.allow_from_autoenv and \
-           ctx.auto_envvar_prefix is not None:
-            envvar = '%s_%s' % (ctx.auto_envvar_prefix, self.name.upper())
-            return os.environ.get(envvar)
-
-    def value_from_envvar(self, ctx):
-        rv = self.resolve_envvar_value(ctx)
-        if rv is None:
-            return None
-        value_depth = (self.nargs != 1) + bool(self.multiple)
-        if value_depth > 0 and rv is not None:
-            rv = self.type.split_envvar_value(rv)
-            if self.multiple and self.nargs != 1:
-                rv = batch(rv, self.nargs)
-        return rv
-
-    def full_process_value(self, ctx, value):
-        if value is None and self.prompt is not None \
-           and not ctx.resilient_parsing:
-            return self.prompt_for_value(ctx)
-        return Parameter.full_process_value(self, ctx, value)
-
-
-class Argument(Parameter):
-    """Arguments are positional parameters to a command.  They generally
-    provide fewer features than options but can have infinite ``nargs``
-    and are required by default.
-
-    All parameters are passed onwards to the parameter constructor.
-    """
-    param_type_name = 'argument'
-
-    def __init__(self, param_decls, required=None, **attrs):
-        if required is None:
-            if attrs.get('default') is not None:
-                required = False
-            else:
-                required = attrs.get('nargs', 1) > 0
-        Parameter.__init__(self, param_decls, required=required, **attrs)
-        if self.default is not None and self.nargs < 0:
-            raise TypeError('nargs=-1 in combination with a default value '
-                            'is not supported.')
-
-    @property
-    def human_readable_name(self):
-        if self.metavar is not None:
-            return self.metavar
-        return self.name.upper()
-
-    def make_metavar(self):
-        if self.metavar is not None:
-            return self.metavar
-        var = self.type.get_metavar(self)
-        if not var:
-            var = self.name.upper()
-        if not self.required:
-            var = '[%s]' % var
-        if self.nargs != 1:
-            var += '...'
-        return var
-
-    def _parse_decls(self, decls, expose_value):
-        if not decls:
-            if not expose_value:
-                return None, [], []
-            raise TypeError('Could not determine name for argument')
-        if len(decls) == 1:
-            name = arg = decls[0]
-            name = name.replace('-', '_').lower()
-        else:
-            raise TypeError('Arguments take exactly one '
-                            'parameter declaration, got %d' % len(decls))
-        return name, [arg], []
-
-    def get_usage_pieces(self, ctx):
-        return [self.make_metavar()]
-
-    def get_error_hint(self, ctx):
-        return '"%s"' % self.make_metavar()
-
-    def add_to_parser(self, parser, ctx):
-        parser.add_argument(dest=self.name, nargs=self.nargs,
-                            obj=self)
-
-
-# Circular dependency between decorators and core
-from .decorators import command, group
diff --git a/python/click/decorators.py b/python/click/decorators.py
deleted file mode 100644
index c57c530..0000000
--- a/python/click/decorators.py
+++ /dev/null
@@ -1,311 +0,0 @@
-import sys
-import inspect
-
-from functools import update_wrapper
-
-from ._compat import iteritems
-from ._unicodefun import _check_for_unicode_literals
-from .utils import echo
-from .globals import get_current_context
-
-
-def pass_context(f):
-    """Marks a callback as wanting to receive the current context
-    object as first argument.
-    """
-    def new_func(*args, **kwargs):
-        return f(get_current_context(), *args, **kwargs)
-    return update_wrapper(new_func, f)
-
-
-def pass_obj(f):
-    """Similar to :func:`pass_context`, but only pass the object on the
-    context onwards (:attr:`Context.obj`).  This is useful if that object
-    represents the state of a nested system.
-    """
-    def new_func(*args, **kwargs):
-        return f(get_current_context().obj, *args, **kwargs)
-    return update_wrapper(new_func, f)
-
-
-def make_pass_decorator(object_type, ensure=False):
-    """Given an object type this creates a decorator that will work
-    similar to :func:`pass_obj` but instead of passing the object of the
-    current context, it will find the innermost context of type
-    :func:`object_type`.
-
-    This generates a decorator that works roughly like this::
-
-        from functools import update_wrapper
-
-        def decorator(f):
-            @pass_context
-            def new_func(ctx, *args, **kwargs):
-                obj = ctx.find_object(object_type)
-                return ctx.invoke(f, obj, *args, **kwargs)
-            return update_wrapper(new_func, f)
-        return decorator
-
-    :param object_type: the type of the object to pass.
-    :param ensure: if set to `True`, a new object will be created and
-                   remembered on the context if it's not there yet.
-    """
-    def decorator(f):
-        def new_func(*args, **kwargs):
-            ctx = get_current_context()
-            if ensure:
-                obj = ctx.ensure_object(object_type)
-            else:
-                obj = ctx.find_object(object_type)
-            if obj is None:
-                raise RuntimeError('Managed to invoke callback without a '
-                                   'context object of type %r existing'
-                                   % object_type.__name__)
-            return ctx.invoke(f, obj, *args, **kwargs)
-        return update_wrapper(new_func, f)
-    return decorator
-
-
-def _make_command(f, name, attrs, cls):
-    if isinstance(f, Command):
-        raise TypeError('Attempted to convert a callback into a '
-                        'command twice.')
-    try:
-        params = f.__click_params__
-        params.reverse()
-        del f.__click_params__
-    except AttributeError:
-        params = []
-    help = attrs.get('help')
-    if help is None:
-        help = inspect.getdoc(f)
-        if isinstance(help, bytes):
-            help = help.decode('utf-8')
-    else:
-        help = inspect.cleandoc(help)
-    attrs['help'] = help
-    _check_for_unicode_literals()
-    return cls(name=name or f.__name__.lower().replace('_', '-'),
-               callback=f, params=params, **attrs)
-
-
-def command(name=None, cls=None, **attrs):
-    r"""Creates a new :class:`Command` and uses the decorated function as
-    callback.  This will also automatically attach all decorated
-    :func:`option`\s and :func:`argument`\s as parameters to the command.
-
-    The name of the command defaults to the name of the function.  If you
-    want to change that, you can pass the intended name as the first
-    argument.
-
-    All keyword arguments are forwarded to the underlying command class.
-
-    Once decorated the function turns into a :class:`Command` instance
-    that can be invoked as a command line utility or be attached to a
-    command :class:`Group`.
-
-    :param name: the name of the command.  This defaults to the function
-                 name with underscores replaced by dashes.
-    :param cls: the command class to instantiate.  This defaults to
-                :class:`Command`.
-    """
-    if cls is None:
-        cls = Command
-    def decorator(f):
-        cmd = _make_command(f, name, attrs, cls)
-        cmd.__doc__ = f.__doc__
-        return cmd
-    return decorator
-
-
-def group(name=None, **attrs):
-    """Creates a new :class:`Group` with a function as callback.  This
-    works otherwise the same as :func:`command` just that the `cls`
-    parameter is set to :class:`Group`.
-    """
-    attrs.setdefault('cls', Group)
-    return command(name, **attrs)
-
-
-def _param_memo(f, param):
-    if isinstance(f, Command):
-        f.params.append(param)
-    else:
-        if not hasattr(f, '__click_params__'):
-            f.__click_params__ = []
-        f.__click_params__.append(param)
-
-
-def argument(*param_decls, **attrs):
-    """Attaches an argument to the command.  All positional arguments are
-    passed as parameter declarations to :class:`Argument`; all keyword
-    arguments are forwarded unchanged (except ``cls``).
-    This is equivalent to creating an :class:`Argument` instance manually
-    and attaching it to the :attr:`Command.params` list.
-
-    :param cls: the argument class to instantiate.  This defaults to
-                :class:`Argument`.
-    """
-    def decorator(f):
-        ArgumentClass = attrs.pop('cls', Argument)
-        _param_memo(f, ArgumentClass(param_decls, **attrs))
-        return f
-    return decorator
-
-
-def option(*param_decls, **attrs):
-    """Attaches an option to the command.  All positional arguments are
-    passed as parameter declarations to :class:`Option`; all keyword
-    arguments are forwarded unchanged (except ``cls``).
-    This is equivalent to creating an :class:`Option` instance manually
-    and attaching it to the :attr:`Command.params` list.
-
-    :param cls: the option class to instantiate.  This defaults to
-                :class:`Option`.
-    """
-    def decorator(f):
-        # Issue 926, copy attrs, so pre-defined options can re-use the same cls=
-        option_attrs = attrs.copy()
-
-        if 'help' in option_attrs:
-            option_attrs['help'] = inspect.cleandoc(option_attrs['help'])
-        OptionClass = option_attrs.pop('cls', Option)
-        _param_memo(f, OptionClass(param_decls, **option_attrs))
-        return f
-    return decorator
-
-
-def confirmation_option(*param_decls, **attrs):
-    """Shortcut for confirmation prompts that can be ignored by passing
-    ``--yes`` as parameter.
-
-    This is equivalent to decorating a function with :func:`option` with
-    the following parameters::
-
-        def callback(ctx, param, value):
-            if not value:
-                ctx.abort()
-
-        @click.command()
-        @click.option('--yes', is_flag=True, callback=callback,
-                      expose_value=False, prompt='Do you want to continue?')
-        def dropdb():
-            pass
-    """
-    def decorator(f):
-        def callback(ctx, param, value):
-            if not value:
-                ctx.abort()
-        attrs.setdefault('is_flag', True)
-        attrs.setdefault('callback', callback)
-        attrs.setdefault('expose_value', False)
-        attrs.setdefault('prompt', 'Do you want to continue?')
-        attrs.setdefault('help', 'Confirm the action without prompting.')
-        return option(*(param_decls or ('--yes',)), **attrs)(f)
-    return decorator
-
-
-def password_option(*param_decls, **attrs):
-    """Shortcut for password prompts.
-
-    This is equivalent to decorating a function with :func:`option` with
-    the following parameters::
-
-        @click.command()
-        @click.option('--password', prompt=True, confirmation_prompt=True,
-                      hide_input=True)
-        def changeadmin(password):
-            pass
-    """
-    def decorator(f):
-        attrs.setdefault('prompt', True)
-        attrs.setdefault('confirmation_prompt', True)
-        attrs.setdefault('hide_input', True)
-        return option(*(param_decls or ('--password',)), **attrs)(f)
-    return decorator
-
-
-def version_option(version=None, *param_decls, **attrs):
-    """Adds a ``--version`` option which immediately ends the program
-    printing out the version number.  This is implemented as an eager
-    option that prints the version and exits the program in the callback.
-
-    :param version: the version number to show.  If not provided Click
-                    attempts an auto discovery via setuptools.
-    :param prog_name: the name of the program (defaults to autodetection)
-    :param message: custom message to show instead of the default
-                    (``'%(prog)s, version %(version)s'``)
-    :param others: everything else is forwarded to :func:`option`.
-    """
-    if version is None:
-        if hasattr(sys, '_getframe'):
-            module = sys._getframe(1).f_globals.get('__name__')
-        else:
-            module = ''
-
-    def decorator(f):
-        prog_name = attrs.pop('prog_name', None)
-        message = attrs.pop('message', '%(prog)s, version %(version)s')
-
-        def callback(ctx, param, value):
-            if not value or ctx.resilient_parsing:
-                return
-            prog = prog_name
-            if prog is None:
-                prog = ctx.find_root().info_name
-            ver = version
-            if ver is None:
-                try:
-                    import pkg_resources
-                except ImportError:
-                    pass
-                else:
-                    for dist in pkg_resources.working_set:
-                        scripts = dist.get_entry_map().get('console_scripts') or {}
-                        for script_name, entry_point in iteritems(scripts):
-                            if entry_point.module_name == module:
-                                ver = dist.version
-                                break
-                if ver is None:
-                    raise RuntimeError('Could not determine version')
-            echo(message % {
-                'prog': prog,
-                'version': ver,
-            }, color=ctx.color)
-            ctx.exit()
-
-        attrs.setdefault('is_flag', True)
-        attrs.setdefault('expose_value', False)
-        attrs.setdefault('is_eager', True)
-        attrs.setdefault('help', 'Show the version and exit.')
-        attrs['callback'] = callback
-        return option(*(param_decls or ('--version',)), **attrs)(f)
-    return decorator
-
-
-def help_option(*param_decls, **attrs):
-    """Adds a ``--help`` option which immediately ends the program
-    printing out the help page.  This is usually unnecessary to add as
-    this is added by default to all commands unless suppressed.
-
-    Like :func:`version_option`, this is implemented as eager option that
-    prints in the callback and exits.
-
-    All arguments are forwarded to :func:`option`.
-    """
-    def decorator(f):
-        def callback(ctx, param, value):
-            if value and not ctx.resilient_parsing:
-                echo(ctx.get_help(), color=ctx.color)
-                ctx.exit()
-        attrs.setdefault('is_flag', True)
-        attrs.setdefault('expose_value', False)
-        attrs.setdefault('help', 'Show this message and exit.')
-        attrs.setdefault('is_eager', True)
-        attrs['callback'] = callback
-        return option(*(param_decls or ('--help',)), **attrs)(f)
-    return decorator
-
-
-# Circular dependencies between core and decorators
-from .core import Command, Group, Argument, Option
diff --git a/python/click/exceptions.py b/python/click/exceptions.py
deleted file mode 100644
index 6fa1765..0000000
--- a/python/click/exceptions.py
+++ /dev/null
@@ -1,235 +0,0 @@
-from ._compat import PY2, filename_to_ui, get_text_stderr
-from .utils import echo
-
-
-def _join_param_hints(param_hint):
-    if isinstance(param_hint, (tuple, list)):
-        return ' / '.join('"%s"' % x for x in param_hint)
-    return param_hint
-
-
-class ClickException(Exception):
-    """An exception that Click can handle and show to the user."""
-
-    #: The exit code for this exception
-    exit_code = 1
-
-    def __init__(self, message):
-        ctor_msg = message
-        if PY2:
-            if ctor_msg is not None:
-                ctor_msg = ctor_msg.encode('utf-8')
-        Exception.__init__(self, ctor_msg)
-        self.message = message
-
-    def format_message(self):
-        return self.message
-
-    def __str__(self):
-        return self.message
-
-    if PY2:
-        __unicode__ = __str__
-
-        def __str__(self):
-            return self.message.encode('utf-8')
-
-    def show(self, file=None):
-        if file is None:
-            file = get_text_stderr()
-        echo('Error: %s' % self.format_message(), file=file)
-
-
-class UsageError(ClickException):
-    """An internal exception that signals a usage error.  This typically
-    aborts any further handling.
-
-    :param message: the error message to display.
-    :param ctx: optionally the context that caused this error.  Click will
-                fill in the context automatically in some situations.
-    """
-    exit_code = 2
-
-    def __init__(self, message, ctx=None):
-        ClickException.__init__(self, message)
-        self.ctx = ctx
-        self.cmd = self.ctx and self.ctx.command or None
-
-    def show(self, file=None):
-        if file is None:
-            file = get_text_stderr()
-        color = None
-        hint = ''
-        if (self.cmd is not None and
-                self.cmd.get_help_option(self.ctx) is not None):
-            hint = ('Try "%s %s" for help.\n'
-                    % (self.ctx.command_path, self.ctx.help_option_names[0]))
-        if self.ctx is not None:
-            color = self.ctx.color
-            echo(self.ctx.get_usage() + '\n%s' % hint, file=file, color=color)
-        echo('Error: %s' % self.format_message(), file=file, color=color)
-
-
-class BadParameter(UsageError):
-    """An exception that formats out a standardized error message for a
-    bad parameter.  This is useful when thrown from a callback or type as
-    Click will attach contextual information to it (for instance, which
-    parameter it is).
-
-    .. versionadded:: 2.0
-
-    :param param: the parameter object that caused this error.  This can
-                  be left out, and Click will attach this info itself
-                  if possible.
-    :param param_hint: a string that shows up as parameter name.  This
-                       can be used as alternative to `param` in cases
-                       where custom validation should happen.  If it is
-                       a string it's used as such, if it's a list then
-                       each item is quoted and separated.
-    """
-
-    def __init__(self, message, ctx=None, param=None,
-                 param_hint=None):
-        UsageError.__init__(self, message, ctx)
-        self.param = param
-        self.param_hint = param_hint
-
-    def format_message(self):
-        if self.param_hint is not None:
-            param_hint = self.param_hint
-        elif self.param is not None:
-            param_hint = self.param.get_error_hint(self.ctx)
-        else:
-            return 'Invalid value: %s' % self.message
-        param_hint = _join_param_hints(param_hint)
-
-        return 'Invalid value for %s: %s' % (param_hint, self.message)
-
-
-class MissingParameter(BadParameter):
-    """Raised if click required an option or argument but it was not
-    provided when invoking the script.
-
-    .. versionadded:: 4.0
-
-    :param param_type: a string that indicates the type of the parameter.
-                       The default is to inherit the parameter type from
-                       the given `param`.  Valid values are ``'parameter'``,
-                       ``'option'`` or ``'argument'``.
-    """
-
-    def __init__(self, message=None, ctx=None, param=None,
-                 param_hint=None, param_type=None):
-        BadParameter.__init__(self, message, ctx, param, param_hint)
-        self.param_type = param_type
-
-    def format_message(self):
-        if self.param_hint is not None:
-            param_hint = self.param_hint
-        elif self.param is not None:
-            param_hint = self.param.get_error_hint(self.ctx)
-        else:
-            param_hint = None
-        param_hint = _join_param_hints(param_hint)
-
-        param_type = self.param_type
-        if param_type is None and self.param is not None:
-            param_type = self.param.param_type_name
-
-        msg = self.message
-        if self.param is not None:
-            msg_extra = self.param.type.get_missing_message(self.param)
-            if msg_extra:
-                if msg:
-                    msg += '.  ' + msg_extra
-                else:
-                    msg = msg_extra
-
-        return 'Missing %s%s%s%s' % (
-            param_type,
-            param_hint and ' %s' % param_hint or '',
-            msg and '.  ' or '.',
-            msg or '',
-        )
-
-
-class NoSuchOption(UsageError):
-    """Raised if click attempted to handle an option that does not
-    exist.
-
-    .. versionadded:: 4.0
-    """
-
-    def __init__(self, option_name, message=None, possibilities=None,
-                 ctx=None):
-        if message is None:
-            message = 'no such option: %s' % option_name
-        UsageError.__init__(self, message, ctx)
-        self.option_name = option_name
-        self.possibilities = possibilities
-
-    def format_message(self):
-        bits = [self.message]
-        if self.possibilities:
-            if len(self.possibilities) == 1:
-                bits.append('Did you mean %s?' % self.possibilities[0])
-            else:
-                possibilities = sorted(self.possibilities)
-                bits.append('(Possible options: %s)' % ', '.join(possibilities))
-        return '  '.join(bits)
-
-
-class BadOptionUsage(UsageError):
-    """Raised if an option is generally supplied but the use of the option
-    was incorrect.  This is for instance raised if the number of arguments
-    for an option is not correct.
-
-    .. versionadded:: 4.0
-
-    :param option_name: the name of the option being used incorrectly.
-    """
-
-    def __init__(self, option_name, message, ctx=None):
-        UsageError.__init__(self, message, ctx)
-        self.option_name = option_name
-
-
-class BadArgumentUsage(UsageError):
-    """Raised if an argument is generally supplied but the use of the argument
-    was incorrect.  This is for instance raised if the number of values
-    for an argument is not correct.
-
-    .. versionadded:: 6.0
-    """
-
-    def __init__(self, message, ctx=None):
-        UsageError.__init__(self, message, ctx)
-
-
-class FileError(ClickException):
-    """Raised if a file cannot be opened."""
-
-    def __init__(self, filename, hint=None):
-        ui_filename = filename_to_ui(filename)
-        if hint is None:
-            hint = 'unknown error'
-        ClickException.__init__(self, hint)
-        self.ui_filename = ui_filename
-        self.filename = filename
-
-    def format_message(self):
-        return 'Could not open file %s: %s' % (self.ui_filename, self.message)
-
-
-class Abort(RuntimeError):
-    """An internal signalling exception that signals Click to abort."""
-
-
-class Exit(RuntimeError):
-    """An exception that indicates that the application should exit with some
-    status code.
-
-    :param code: the status code to exit with.
-    """
-    def __init__(self, code=0):
-        self.exit_code = code
diff --git a/python/click/formatting.py b/python/click/formatting.py
deleted file mode 100644
index a3d6a4d..0000000
--- a/python/click/formatting.py
+++ /dev/null
@@ -1,256 +0,0 @@
-from contextlib import contextmanager
-from .termui import get_terminal_size
-from .parser import split_opt
-from ._compat import term_len
-
-
-# Can force a width.  This is used by the test system
-FORCED_WIDTH = None
-
-
-def measure_table(rows):
-    widths = {}
-    for row in rows:
-        for idx, col in enumerate(row):
-            widths[idx] = max(widths.get(idx, 0), term_len(col))
-    return tuple(y for x, y in sorted(widths.items()))
-
-
-def iter_rows(rows, col_count):
-    for row in rows:
-        row = tuple(row)
-        yield row + ('',) * (col_count - len(row))
-
-
-def wrap_text(text, width=78, initial_indent='', subsequent_indent='',
-              preserve_paragraphs=False):
-    """A helper function that intelligently wraps text.  By default, it
-    assumes that it operates on a single paragraph of text but if the
-    `preserve_paragraphs` parameter is provided it will intelligently
-    handle paragraphs (defined by two empty lines).
-
-    If paragraphs are handled, a paragraph can be prefixed with an empty
-    line containing the ``\\b`` character (``\\x08``) to indicate that
-    no rewrapping should happen in that block.
-
-    :param text: the text that should be rewrapped.
-    :param width: the maximum width for the text.
-    :param initial_indent: the initial indent that should be placed on the
-                           first line as a string.
-    :param subsequent_indent: the indent string that should be placed on
-                              each consecutive line.
-    :param preserve_paragraphs: if this flag is set then the wrapping will
-                                intelligently handle paragraphs.
-    """
-    from ._textwrap import TextWrapper
-    text = text.expandtabs()
-    wrapper = TextWrapper(width, initial_indent=initial_indent,
-                          subsequent_indent=subsequent_indent,
-                          replace_whitespace=False)
-    if not preserve_paragraphs:
-        return wrapper.fill(text)
-
-    p = []
-    buf = []
-    indent = None
-
-    def _flush_par():
-        if not buf:
-            return
-        if buf[0].strip() == '\b':
-            p.append((indent or 0, True, '\n'.join(buf[1:])))
-        else:
-            p.append((indent or 0, False, ' '.join(buf)))
-        del buf[:]
-
-    for line in text.splitlines():
-        if not line:
-            _flush_par()
-            indent = None
-        else:
-            if indent is None:
-                orig_len = term_len(line)
-                line = line.lstrip()
-                indent = orig_len - term_len(line)
-            buf.append(line)
-    _flush_par()
-
-    rv = []
-    for indent, raw, text in p:
-        with wrapper.extra_indent(' ' * indent):
-            if raw:
-                rv.append(wrapper.indent_only(text))
-            else:
-                rv.append(wrapper.fill(text))
-
-    return '\n\n'.join(rv)
-
-
-class HelpFormatter(object):
-    """This class helps with formatting text-based help pages.  It's
-    usually just needed for very special internal cases, but it's also
-    exposed so that developers can write their own fancy outputs.
-
-    At present, it always writes into memory.
-
-    :param indent_increment: the additional increment for each level.
-    :param width: the width for the text.  This defaults to the terminal
-                  width clamped to a maximum of 78.
-    """
-
-    def __init__(self, indent_increment=2, width=None, max_width=None):
-        self.indent_increment = indent_increment
-        if max_width is None:
-            max_width = 80
-        if width is None:
-            width = FORCED_WIDTH
-            if width is None:
-                width = max(min(get_terminal_size()[0], max_width) - 2, 50)
-        self.width = width
-        self.current_indent = 0
-        self.buffer = []
-
-    def write(self, string):
-        """Writes a unicode string into the internal buffer."""
-        self.buffer.append(string)
-
-    def indent(self):
-        """Increases the indentation."""
-        self.current_indent += self.indent_increment
-
-    def dedent(self):
-        """Decreases the indentation."""
-        self.current_indent -= self.indent_increment
-
-    def write_usage(self, prog, args='', prefix='Usage: '):
-        """Writes a usage line into the buffer.
-
-        :param prog: the program name.
-        :param args: whitespace separated list of arguments.
-        :param prefix: the prefix for the first line.
-        """
-        usage_prefix = '%*s%s ' % (self.current_indent, prefix, prog)
-        text_width = self.width - self.current_indent
-
-        if text_width >= (term_len(usage_prefix) + 20):
-            # The arguments will fit to the right of the prefix.
-            indent = ' ' * term_len(usage_prefix)
-            self.write(wrap_text(args, text_width,
-                                 initial_indent=usage_prefix,
-                                 subsequent_indent=indent))
-        else:
-            # The prefix is too long, put the arguments on the next line.
-            self.write(usage_prefix)
-            self.write('\n')
-            indent = ' ' * (max(self.current_indent, term_len(prefix)) + 4)
-            self.write(wrap_text(args, text_width,
-                                 initial_indent=indent,
-                                 subsequent_indent=indent))
-
-        self.write('\n')
-
-    def write_heading(self, heading):
-        """Writes a heading into the buffer."""
-        self.write('%*s%s:\n' % (self.current_indent, '', heading))
-
-    def write_paragraph(self):
-        """Writes a paragraph into the buffer."""
-        if self.buffer:
-            self.write('\n')
-
-    def write_text(self, text):
-        """Writes re-indented text into the buffer.  This rewraps and
-        preserves paragraphs.
-        """
-        text_width = max(self.width - self.current_indent, 11)
-        indent = ' ' * self.current_indent
-        self.write(wrap_text(text, text_width,
-                             initial_indent=indent,
-                             subsequent_indent=indent,
-                             preserve_paragraphs=True))
-        self.write('\n')
-
-    def write_dl(self, rows, col_max=30, col_spacing=2):
-        """Writes a definition list into the buffer.  This is how options
-        and commands are usually formatted.
-
-        :param rows: a list of two item tuples for the terms and values.
-        :param col_max: the maximum width of the first column.
-        :param col_spacing: the number of spaces between the first and
-                            second column.
-        """
-        rows = list(rows)
-        widths = measure_table(rows)
-        if len(widths) != 2:
-            raise TypeError('Expected two columns for definition list')
-
-        first_col = min(widths[0], col_max) + col_spacing
-
-        for first, second in iter_rows(rows, len(widths)):
-            self.write('%*s%s' % (self.current_indent, '', first))
-            if not second:
-                self.write('\n')
-                continue
-            if term_len(first) <= first_col - col_spacing:
-                self.write(' ' * (first_col - term_len(first)))
-            else:
-                self.write('\n')
-                self.write(' ' * (first_col + self.current_indent))
-
-            text_width = max(self.width - first_col - 2, 10)
-            lines = iter(wrap_text(second, text_width).splitlines())
-            if lines:
-                self.write(next(lines) + '\n')
-                for line in lines:
-                    self.write('%*s%s\n' % (
-                        first_col + self.current_indent, '', line))
-            else:
-                self.write('\n')
-
-    @contextmanager
-    def section(self, name):
-        """Helpful context manager that writes a paragraph, a heading,
-        and the indents.
-
-        :param name: the section name that is written as heading.
-        """
-        self.write_paragraph()
-        self.write_heading(name)
-        self.indent()
-        try:
-            yield
-        finally:
-            self.dedent()
-
-    @contextmanager
-    def indentation(self):
-        """A context manager that increases the indentation."""
-        self.indent()
-        try:
-            yield
-        finally:
-            self.dedent()
-
-    def getvalue(self):
-        """Returns the buffer contents."""
-        return ''.join(self.buffer)
-
-
-def join_options(options):
-    """Given a list of option strings this joins them in the most appropriate
-    way and returns them in the form ``(formatted_string,
-    any_prefix_is_slash)`` where the second item in the tuple is a flag that
-    indicates if any of the option prefixes was a slash.
-    """
-    rv = []
-    any_prefix_is_slash = False
-    for opt in options:
-        prefix = split_opt(opt)[0]
-        if prefix == '/':
-            any_prefix_is_slash = True
-        rv.append((len(prefix), opt))
-
-    rv.sort(key=lambda x: x[0])
-
-    rv = ', '.join(x[1] for x in rv)
-    return rv, any_prefix_is_slash
diff --git a/python/click/globals.py b/python/click/globals.py
deleted file mode 100644
index 843b594..0000000
--- a/python/click/globals.py
+++ /dev/null
@@ -1,48 +0,0 @@
-from threading import local
-
-
-_local = local()
-
-
-def get_current_context(silent=False):
-    """Returns the current click context.  This can be used as a way to
-    access the current context object from anywhere.  This is a more implicit
-    alternative to the :func:`pass_context` decorator.  This function is
-    primarily useful for helpers such as :func:`echo` which might be
-    interested in changing its behavior based on the current context.
-
-    To push the current context, :meth:`Context.scope` can be used.
-
-    .. versionadded:: 5.0
-
-    :param silent: is set to `True` the return value is `None` if no context
-                   is available.  The default behavior is to raise a
-                   :exc:`RuntimeError`.
-    """
-    try:
-        return getattr(_local, 'stack')[-1]
-    except (AttributeError, IndexError):
-        if not silent:
-            raise RuntimeError('There is no active click context.')
-
-
-def push_context(ctx):
-    """Pushes a new context to the current stack."""
-    _local.__dict__.setdefault('stack', []).append(ctx)
-
-
-def pop_context():
-    """Removes the top level from the stack."""
-    _local.stack.pop()
-
-
-def resolve_color_default(color=None):
-    """"Internal helper to get the default value of the color flag.  If a
-    value is passed it's returned unchanged, otherwise it's looked up from
-    the current context.
-    """
-    if color is not None:
-        return color
-    ctx = get_current_context(silent=True)
-    if ctx is not None:
-        return ctx.color
diff --git a/python/click/parser.py b/python/click/parser.py
deleted file mode 100644
index 1c3ae9c..0000000
--- a/python/click/parser.py
+++ /dev/null
@@ -1,427 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-click.parser
-~~~~~~~~~~~~
-
-This module started out as largely a copy paste from the stdlib's
-optparse module with the features removed that we do not need from
-optparse because we implement them in Click on a higher level (for
-instance type handling, help formatting and a lot more).
-
-The plan is to remove more and more from here over time.
-
-The reason this is a different module and not optparse from the stdlib
-is that there are differences in 2.x and 3.x about the error messages
-generated and optparse in the stdlib uses gettext for no good reason
-and might cause us issues.
-"""
-
-import re
-from collections import deque
-from .exceptions import UsageError, NoSuchOption, BadOptionUsage, \
-     BadArgumentUsage
-
-
-def _unpack_args(args, nargs_spec):
-    """Given an iterable of arguments and an iterable of nargs specifications,
-    it returns a tuple with all the unpacked arguments at the first index
-    and all remaining arguments as the second.
-
-    The nargs specification is the number of arguments that should be consumed
-    or `-1` to indicate that this position should eat up all the remainders.
-
-    Missing items are filled with `None`.
-    """
-    args = deque(args)
-    nargs_spec = deque(nargs_spec)
-    rv = []
-    spos = None
-
-    def _fetch(c):
-        try:
-            if spos is None:
-                return c.popleft()
-            else:
-                return c.pop()
-        except IndexError:
-            return None
-
-    while nargs_spec:
-        nargs = _fetch(nargs_spec)
-        if nargs == 1:
-            rv.append(_fetch(args))
-        elif nargs > 1:
-            x = [_fetch(args) for _ in range(nargs)]
-            # If we're reversed, we're pulling in the arguments in reverse,
-            # so we need to turn them around.
-            if spos is not None:
-                x.reverse()
-            rv.append(tuple(x))
-        elif nargs < 0:
-            if spos is not None:
-                raise TypeError('Cannot have two nargs < 0')
-            spos = len(rv)
-            rv.append(None)
-
-    # spos is the position of the wildcard (star).  If it's not `None`,
-    # we fill it with the remainder.
-    if spos is not None:
-        rv[spos] = tuple(args)
-        args = []
-        rv[spos + 1:] = reversed(rv[spos + 1:])
-
-    return tuple(rv), list(args)
-
-
-def _error_opt_args(nargs, opt):
-    if nargs == 1:
-        raise BadOptionUsage(opt, '%s option requires an argument' % opt)
-    raise BadOptionUsage(opt, '%s option requires %d arguments' % (opt, nargs))
-
-
-def split_opt(opt):
-    first = opt[:1]
-    if first.isalnum():
-        return '', opt
-    if opt[1:2] == first:
-        return opt[:2], opt[2:]
-    return first, opt[1:]
-
-
-def normalize_opt(opt, ctx):
-    if ctx is None or ctx.token_normalize_func is None:
-        return opt
-    prefix, opt = split_opt(opt)
-    return prefix + ctx.token_normalize_func(opt)
-
-
-def split_arg_string(string):
-    """Given an argument string this attempts to split it into small parts."""
-    rv = []
-    for match in re.finditer(r"('([^'\\]*(?:\\.[^'\\]*)*)'"
-                             r'|"([^"\\]*(?:\\.[^"\\]*)*)"'
-                             r'|\S+)\s*', string, re.S):
-        arg = match.group().strip()
-        if arg[:1] == arg[-1:] and arg[:1] in '"\'':
-            arg = arg[1:-1].encode('ascii', 'backslashreplace') \
-                .decode('unicode-escape')
-        try:
-            arg = type(string)(arg)
-        except UnicodeError:
-            pass
-        rv.append(arg)
-    return rv
-
-
-class Option(object):
-
-    def __init__(self, opts, dest, action=None, nargs=1, const=None, obj=None):
-        self._short_opts = []
-        self._long_opts = []
-        self.prefixes = set()
-
-        for opt in opts:
-            prefix, value = split_opt(opt)
-            if not prefix:
-                raise ValueError('Invalid start character for option (%s)'
-                                 % opt)
-            self.prefixes.add(prefix[0])
-            if len(prefix) == 1 and len(value) == 1:
-                self._short_opts.append(opt)
-            else:
-                self._long_opts.append(opt)
-                self.prefixes.add(prefix)
-
-        if action is None:
-            action = 'store'
-
-        self.dest = dest
-        self.action = action
-        self.nargs = nargs
-        self.const = const
-        self.obj = obj
-
-    @property
-    def takes_value(self):
-        return self.action in ('store', 'append')
-
-    def process(self, value, state):
-        if self.action == 'store':
-            state.opts[self.dest] = value
-        elif self.action == 'store_const':
-            state.opts[self.dest] = self.const
-        elif self.action == 'append':
-            state.opts.setdefault(self.dest, []).append(value)
-        elif self.action == 'append_const':
-            state.opts.setdefault(self.dest, []).append(self.const)
-        elif self.action == 'count':
-            state.opts[self.dest] = state.opts.get(self.dest, 0) + 1
-        else:
-            raise ValueError('unknown action %r' % self.action)
-        state.order.append(self.obj)
-
-
-class Argument(object):
-
-    def __init__(self, dest, nargs=1, obj=None):
-        self.dest = dest
-        self.nargs = nargs
-        self.obj = obj
-
-    def process(self, value, state):
-        if self.nargs > 1:
-            holes = sum(1 for x in value if x is None)
-            if holes == len(value):
-                value = None
-            elif holes != 0:
-                raise BadArgumentUsage('argument %s takes %d values'
-                                       % (self.dest, self.nargs))
-        state.opts[self.dest] = value
-        state.order.append(self.obj)
-
-
-class ParsingState(object):
-
-    def __init__(self, rargs):
-        self.opts = {}
-        self.largs = []
-        self.rargs = rargs
-        self.order = []
-
-
-class OptionParser(object):
-    """The option parser is an internal class that is ultimately used to
-    parse options and arguments.  It's modelled after optparse and brings
-    a similar but vastly simplified API.  It should generally not be used
-    directly as the high level Click classes wrap it for you.
-
-    It's not nearly as extensible as optparse or argparse as it does not
-    implement features that are implemented on a higher level (such as
-    types or defaults).
-
-    :param ctx: optionally the :class:`~click.Context` where this parser
-                should go with.
-    """
-
-    def __init__(self, ctx=None):
-        #: The :class:`~click.Context` for this parser.  This might be
-        #: `None` for some advanced use cases.
-        self.ctx = ctx
-        #: This controls how the parser deals with interspersed arguments.
-        #: If this is set to `False`, the parser will stop on the first
-        #: non-option.  Click uses this to implement nested subcommands
-        #: safely.
-        self.allow_interspersed_args = True
-        #: This tells the parser how to deal with unknown options.  By
-        #: default it will error out (which is sensible), but there is a
-        #: second mode where it will ignore it and continue processing
-        #: after shifting all the unknown options into the resulting args.
-        self.ignore_unknown_options = False
-        if ctx is not None:
-            self.allow_interspersed_args = ctx.allow_interspersed_args
-            self.ignore_unknown_options = ctx.ignore_unknown_options
-        self._short_opt = {}
-        self._long_opt = {}
-        self._opt_prefixes = set(['-', '--'])
-        self._args = []
-
-    def add_option(self, opts, dest, action=None, nargs=1, const=None,
-                   obj=None):
-        """Adds a new option named `dest` to the parser.  The destination
-        is not inferred (unlike with optparse) and needs to be explicitly
-        provided.  Action can be any of ``store``, ``store_const``,
-        ``append``, ``appnd_const`` or ``count``.
-
-        The `obj` can be used to identify the option in the order list
-        that is returned from the parser.
-        """
-        if obj is None:
-            obj = dest
-        opts = [normalize_opt(opt, self.ctx) for opt in opts]
-        option = Option(opts, dest, action=action, nargs=nargs,
-                        const=const, obj=obj)
-        self._opt_prefixes.update(option.prefixes)
-        for opt in option._short_opts:
-            self._short_opt[opt] = option
-        for opt in option._long_opts:
-            self._long_opt[opt] = option
-
-    def add_argument(self, dest, nargs=1, obj=None):
-        """Adds a positional argument named `dest` to the parser.
-
-        The `obj` can be used to identify the option in the order list
-        that is returned from the parser.
-        """
-        if obj is None:
-            obj = dest
-        self._args.append(Argument(dest=dest, nargs=nargs, obj=obj))
-
-    def parse_args(self, args):
-        """Parses positional arguments and returns ``(values, args, order)``
-        for the parsed options and arguments as well as the leftover
-        arguments if there are any.  The order is a list of objects as they
-        appear on the command line.  If arguments appear multiple times they
-        will be memorized multiple times as well.
-        """
-        state = ParsingState(args)
-        try:
-            self._process_args_for_options(state)
-            self._process_args_for_args(state)
-        except UsageError:
-            if self.ctx is None or not self.ctx.resilient_parsing:
-                raise
-        return state.opts, state.largs, state.order
-
-    def _process_args_for_args(self, state):
-        pargs, args = _unpack_args(state.largs + state.rargs,
-                                   [x.nargs for x in self._args])
-
-        for idx, arg in enumerate(self._args):
-            arg.process(pargs[idx], state)
-
-        state.largs = args
-        state.rargs = []
-
-    def _process_args_for_options(self, state):
-        while state.rargs:
-            arg = state.rargs.pop(0)
-            arglen = len(arg)
-            # Double dashes always handled explicitly regardless of what
-            # prefixes are valid.
-            if arg == '--':
-                return
-            elif arg[:1] in self._opt_prefixes and arglen > 1:
-                self._process_opts(arg, state)
-            elif self.allow_interspersed_args:
-                state.largs.append(arg)
-            else:
-                state.rargs.insert(0, arg)
-                return
-
-        # Say this is the original argument list:
-        # [arg0, arg1, ..., arg(i-1), arg(i), arg(i+1), ..., arg(N-1)]
-        #                            ^
-        # (we are about to process arg(i)).
-        #
-        # Then rargs is [arg(i), ..., arg(N-1)] and largs is a *subset* of
-        # [arg0, ..., arg(i-1)] (any options and their arguments will have
-        # been removed from largs).
-        #
-        # The while loop will usually consume 1 or more arguments per pass.
-        # If it consumes 1 (eg. arg is an option that takes no arguments),
-        # then after _process_arg() is done the situation is:
-        #
-        #   largs = subset of [arg0, ..., arg(i)]
-        #   rargs = [arg(i+1), ..., arg(N-1)]
-        #
-        # If allow_interspersed_args is false, largs will always be
-        # *empty* -- still a subset of [arg0, ..., arg(i-1)], but
-        # not a very interesting subset!
-
-    def _match_long_opt(self, opt, explicit_value, state):
-        if opt not in self._long_opt:
-            possibilities = [word for word in self._long_opt
-                             if word.startswith(opt)]
-            raise NoSuchOption(opt, possibilities=possibilities, ctx=self.ctx)
-
-        option = self._long_opt[opt]
-        if option.takes_value:
-            # At this point it's safe to modify rargs by injecting the
-            # explicit value, because no exception is raised in this
-            # branch.  This means that the inserted value will be fully
-            # consumed.
-            if explicit_value is not None:
-                state.rargs.insert(0, explicit_value)
-
-            nargs = option.nargs
-            if len(state.rargs) < nargs:
-                _error_opt_args(nargs, opt)
-            elif nargs == 1:
-                value = state.rargs.pop(0)
-            else:
-                value = tuple(state.rargs[:nargs])
-                del state.rargs[:nargs]
-
-        elif explicit_value is not None:
-            raise BadOptionUsage(opt, '%s option does not take a value' % opt)
-
-        else:
-            value = None
-
-        option.process(value, state)
-
-    def _match_short_opt(self, arg, state):
-        stop = False
-        i = 1
-        prefix = arg[0]
-        unknown_options = []
-
-        for ch in arg[1:]:
-            opt = normalize_opt(prefix + ch, self.ctx)
-            option = self._short_opt.get(opt)
-            i += 1
-
-            if not option:
-                if self.ignore_unknown_options:
-                    unknown_options.append(ch)
-                    continue
-                raise NoSuchOption(opt, ctx=self.ctx)
-            if option.takes_value:
-                # Any characters left in arg?  Pretend they're the
-                # next arg, and stop consuming characters of arg.
-                if i < len(arg):
-                    state.rargs.insert(0, arg[i:])
-                    stop = True
-
-                nargs = option.nargs
-                if len(state.rargs) < nargs:
-                    _error_opt_args(nargs, opt)
-                elif nargs == 1:
-                    value = state.rargs.pop(0)
-                else:
-                    value = tuple(state.rargs[:nargs])
-                    del state.rargs[:nargs]
-
-            else:
-                value = None
-
-            option.process(value, state)
-
-            if stop:
-                break
-
-        # If we got any unknown options we re-combinate the string of the
-        # remaining options and re-attach the prefix, then report that
-        # to the state as new larg.  This way there is basic combinatorics
-        # that can be achieved while still ignoring unknown arguments.
-        if self.ignore_unknown_options and unknown_options:
-            state.largs.append(prefix + ''.join(unknown_options))
-
-    def _process_opts(self, arg, state):
-        explicit_value = None
-        # Long option handling happens in two parts.  The first part is
-        # supporting explicitly attached values.  In any case, we will try
-        # to long match the option first.
-        if '=' in arg:
-            long_opt, explicit_value = arg.split('=', 1)
-        else:
-            long_opt = arg
-        norm_long_opt = normalize_opt(long_opt, self.ctx)
-
-        # At this point we will match the (assumed) long option through
-        # the long option matching code.  Note that this allows options
-        # like "-foo" to be matched as long options.
-        try:
-            self._match_long_opt(norm_long_opt, explicit_value, state)
-        except NoSuchOption:
-            # At this point the long option matching failed, and we need
-            # to try with short options.  However there is a special rule
-            # which says, that if we have a two character options prefix
-            # (applies to "--foo" for instance), we do not dispatch to the
-            # short option code and will instead raise the no option
-            # error.
-            if arg[:2] not in self._opt_prefixes:
-                return self._match_short_opt(arg, state)
-            if not self.ignore_unknown_options:
-                raise
-            state.largs.append(arg)
diff --git a/python/click/termui.py b/python/click/termui.py
deleted file mode 100644
index bf9a3aa..0000000
--- a/python/click/termui.py
+++ /dev/null
@@ -1,606 +0,0 @@
-import os
-import sys
-import struct
-import inspect
-import itertools
-
-from ._compat import raw_input, text_type, string_types, \
-     isatty, strip_ansi, get_winterm_size, DEFAULT_COLUMNS, WIN
-from .utils import echo
-from .exceptions import Abort, UsageError
-from .types import convert_type, Choice, Path
-from .globals import resolve_color_default
-
-
-# The prompt functions to use.  The doc tools currently override these
-# functions to customize how they work.
-visible_prompt_func = raw_input
-
-_ansi_colors = {
-    'black': 30,
-    'red': 31,
-    'green': 32,
-    'yellow': 33,
-    'blue': 34,
-    'magenta': 35,
-    'cyan': 36,
-    'white': 37,
-    'reset': 39,
-    'bright_black': 90,
-    'bright_red': 91,
-    'bright_green': 92,
-    'bright_yellow': 93,
-    'bright_blue': 94,
-    'bright_magenta': 95,
-    'bright_cyan': 96,
-    'bright_white': 97,
-}
-_ansi_reset_all = '\033[0m'
-
-
-def hidden_prompt_func(prompt):
-    import getpass
-    return getpass.getpass(prompt)
-
-
-def _build_prompt(text, suffix, show_default=False, default=None, show_choices=True, type=None):
-    prompt = text
-    if type is not None and show_choices and isinstance(type, Choice):
-        prompt += ' (' + ", ".join(map(str, type.choices)) + ')'
-    if default is not None and show_default:
-        prompt = '%s [%s]' % (prompt, default)
-    return prompt + suffix
-
-
-def prompt(text, default=None, hide_input=False, confirmation_prompt=False,
-           type=None, value_proc=None, prompt_suffix=': ', show_default=True,
-           err=False, show_choices=True):
-    """Prompts a user for input.  This is a convenience function that can
-    be used to prompt a user for input later.
-
-    If the user aborts the input by sending a interrupt signal, this
-    function will catch it and raise a :exc:`Abort` exception.
-
-    .. versionadded:: 7.0
-       Added the show_choices parameter.
-
-    .. versionadded:: 6.0
-       Added unicode support for cmd.exe on Windows.
-
-    .. versionadded:: 4.0
-       Added the `err` parameter.
-
-    :param text: the text to show for the prompt.
-    :param default: the default value to use if no input happens.  If this
-                    is not given it will prompt until it's aborted.
-    :param hide_input: if this is set to true then the input value will
-                       be hidden.
-    :param confirmation_prompt: asks for confirmation for the value.
-    :param type: the type to use to check the value against.
-    :param value_proc: if this parameter is provided it's a function that
-                       is invoked instead of the type conversion to
-                       convert a value.
-    :param prompt_suffix: a suffix that should be added to the prompt.
-    :param show_default: shows or hides the default value in the prompt.
-    :param err: if set to true the file defaults to ``stderr`` instead of
-                ``stdout``, the same as with echo.
-    :param show_choices: Show or hide choices if the passed type is a Choice.
-                         For example if type is a Choice of either day or week,
-                         show_choices is true and text is "Group by" then the
-                         prompt will be "Group by (day, week): ".
-    """
-    result = None
-
-    def prompt_func(text):
-        f = hide_input and hidden_prompt_func or visible_prompt_func
-        try:
-            # Write the prompt separately so that we get nice
-            # coloring through colorama on Windows
-            echo(text, nl=False, err=err)
-            return f('')
-        except (KeyboardInterrupt, EOFError):
-            # getpass doesn't print a newline if the user aborts input with ^C.
-            # Allegedly this behavior is inherited from getpass(3).
-            # A doc bug has been filed at https://bugs.python.org/issue24711
-            if hide_input:
-                echo(None, err=err)
-            raise Abort()
-
-    if value_proc is None:
-        value_proc = convert_type(type, default)
-
-    prompt = _build_prompt(text, prompt_suffix, show_default, default, show_choices, type)
-
-    while 1:
-        while 1:
-            value = prompt_func(prompt)
-            if value:
-                break
-            elif default is not None:
-                if isinstance(value_proc, Path):
-                    # validate Path default value(exists, dir_okay etc.)
-                    value = default
-                    break
-                return default
-        try:
-            result = value_proc(value)
-        except UsageError as e:
-            echo('Error: %s' % e.message, err=err)
-            continue
-        if not confirmation_prompt:
-            return result
-        while 1:
-            value2 = prompt_func('Repeat for confirmation: ')
-            if value2:
-                break
-        if value == value2:
-            return result
-        echo('Error: the two entered values do not match', err=err)
-
-
-def confirm(text, default=False, abort=False, prompt_suffix=': ',
-            show_default=True, err=False):
-    """Prompts for confirmation (yes/no question).
-
-    If the user aborts the input by sending a interrupt signal this
-    function will catch it and raise a :exc:`Abort` exception.
-
-    .. versionadded:: 4.0
-       Added the `err` parameter.
-
-    :param text: the question to ask.
-    :param default: the default for the prompt.
-    :param abort: if this is set to `True` a negative answer aborts the
-                  exception by raising :exc:`Abort`.
-    :param prompt_suffix: a suffix that should be added to the prompt.
-    :param show_default: shows or hides the default value in the prompt.
-    :param err: if set to true the file defaults to ``stderr`` instead of
-                ``stdout``, the same as with echo.
-    """
-    prompt = _build_prompt(text, prompt_suffix, show_default,
-                           default and 'Y/n' or 'y/N')
-    while 1:
-        try:
-            # Write the prompt separately so that we get nice
-            # coloring through colorama on Windows
-            echo(prompt, nl=False, err=err)
-            value = visible_prompt_func('').lower().strip()
-        except (KeyboardInterrupt, EOFError):
-            raise Abort()
-        if value in ('y', 'yes'):
-            rv = True
-        elif value in ('n', 'no'):
-            rv = False
-        elif value == '':
-            rv = default
-        else:
-            echo('Error: invalid input', err=err)
-            continue
-        break
-    if abort and not rv:
-        raise Abort()
-    return rv
-
-
-def get_terminal_size():
-    """Returns the current size of the terminal as tuple in the form
-    ``(width, height)`` in columns and rows.
-    """
-    # If shutil has get_terminal_size() (Python 3.3 and later) use that
-    if sys.version_info >= (3, 3):
-        import shutil
-        shutil_get_terminal_size = getattr(shutil, 'get_terminal_size', None)
-        if shutil_get_terminal_size:
-            sz = shutil_get_terminal_size()
-            return sz.columns, sz.lines
-
-    # We provide a sensible default for get_winterm_size() when being invoked
-    # inside a subprocess. Without this, it would not provide a useful input.
-    if get_winterm_size is not None:
-        size = get_winterm_size()
-        if size == (0, 0):
-            return (79, 24)
-        else:
-            return size
-
-    def ioctl_gwinsz(fd):
-        try:
-            import fcntl
-            import termios
-            cr = struct.unpack(
-                'hh', fcntl.ioctl(fd, termios.TIOCGWINSZ, '1234'))
-        except Exception:
-            return
-        return cr
-
-    cr = ioctl_gwinsz(0) or ioctl_gwinsz(1) or ioctl_gwinsz(2)
-    if not cr:
-        try:
-            fd = os.open(os.ctermid(), os.O_RDONLY)
-            try:
-                cr = ioctl_gwinsz(fd)
-            finally:
-                os.close(fd)
-        except Exception:
-            pass
-    if not cr or not cr[0] or not cr[1]:
-        cr = (os.environ.get('LINES', 25),
-              os.environ.get('COLUMNS', DEFAULT_COLUMNS))
-    return int(cr[1]), int(cr[0])
-
-
-def echo_via_pager(text_or_generator, color=None):
-    """This function takes a text and shows it via an environment specific
-    pager on stdout.
-
-    .. versionchanged:: 3.0
-       Added the `color` flag.
-
-    :param text_or_generator: the text to page, or alternatively, a
-                              generator emitting the text to page.
-    :param color: controls if the pager supports ANSI colors or not.  The
-                  default is autodetection.
-    """
-    color = resolve_color_default(color)
-
-    if inspect.isgeneratorfunction(text_or_generator):
-        i = text_or_generator()
-    elif isinstance(text_or_generator, string_types):
-        i = [text_or_generator]
-    else:
-        i = iter(text_or_generator)
-
-    # convert every element of i to a text type if necessary
-    text_generator = (el if isinstance(el, string_types) else text_type(el)
-                      for el in i)
-
-    from ._termui_impl import pager
-    return pager(itertools.chain(text_generator, "\n"), color)
-
-
-def progressbar(iterable=None, length=None, label=None, show_eta=True,
-                show_percent=None, show_pos=False,
-                item_show_func=None, fill_char='#', empty_char='-',
-                bar_template='%(label)s  [%(bar)s]  %(info)s',
-                info_sep='  ', width=36, file=None, color=None):
-    """This function creates an iterable context manager that can be used
-    to iterate over something while showing a progress bar.  It will
-    either iterate over the `iterable` or `length` items (that are counted
-    up).  While iteration happens, this function will print a rendered
-    progress bar to the given `file` (defaults to stdout) and will attempt
-    to calculate remaining time and more.  By default, this progress bar
-    will not be rendered if the file is not a terminal.
-
-    The context manager creates the progress bar.  When the context
-    manager is entered the progress bar is already displayed.  With every
-    iteration over the progress bar, the iterable passed to the bar is
-    advanced and the bar is updated.  When the context manager exits,
-    a newline is printed and the progress bar is finalized on screen.
-
-    No printing must happen or the progress bar will be unintentionally
-    destroyed.
-
-    Example usage::
-
-        with progressbar(items) as bar:
-            for item in bar:
-                do_something_with(item)
-
-    Alternatively, if no iterable is specified, one can manually update the
-    progress bar through the `update()` method instead of directly
-    iterating over the progress bar.  The update method accepts the number
-    of steps to increment the bar with::
-
-        with progressbar(length=chunks.total_bytes) as bar:
-            for chunk in chunks:
-                process_chunk(chunk)
-                bar.update(chunks.bytes)
-
-    .. versionadded:: 2.0
-
-    .. versionadded:: 4.0
-       Added the `color` parameter.  Added a `update` method to the
-       progressbar object.
-
-    :param iterable: an iterable to iterate over.  If not provided the length
-                     is required.
-    :param length: the number of items to iterate over.  By default the
-                   progressbar will attempt to ask the iterator about its
-                   length, which might or might not work.  If an iterable is
-                   also provided this parameter can be used to override the
-                   length.  If an iterable is not provided the progress bar
-                   will iterate over a range of that length.
-    :param label: the label to show next to the progress bar.
-    :param show_eta: enables or disables the estimated time display.  This is
-                     automatically disabled if the length cannot be
-                     determined.
-    :param show_percent: enables or disables the percentage display.  The
-                         default is `True` if the iterable has a length or
-                         `False` if not.
-    :param show_pos: enables or disables the absolute position display.  The
-                     default is `False`.
-    :param item_show_func: a function called with the current item which
-                           can return a string to show the current item
-                           next to the progress bar.  Note that the current
-                           item can be `None`!
-    :param fill_char: the character to use to show the filled part of the
-                      progress bar.
-    :param empty_char: the character to use to show the non-filled part of
-                       the progress bar.
-    :param bar_template: the format string to use as template for the bar.
-                         The parameters in it are ``label`` for the label,
-                         ``bar`` for the progress bar and ``info`` for the
-                         info section.
-    :param info_sep: the separator between multiple info items (eta etc.)
-    :param width: the width of the progress bar in characters, 0 means full
-                  terminal width
-    :param file: the file to write to.  If this is not a terminal then
-                 only the label is printed.
-    :param color: controls if the terminal supports ANSI colors or not.  The
-                  default is autodetection.  This is only needed if ANSI
-                  codes are included anywhere in the progress bar output
-                  which is not the case by default.
-    """
-    from ._termui_impl import ProgressBar
-    color = resolve_color_default(color)
-    return ProgressBar(iterable=iterable, length=length, show_eta=show_eta,
-                       show_percent=show_percent, show_pos=show_pos,
-                       item_show_func=item_show_func, fill_char=fill_char,
-                       empty_char=empty_char, bar_template=bar_template,
-                       info_sep=info_sep, file=file, label=label,
-                       width=width, color=color)
-
-
-def clear():
-    """Clears the terminal screen.  This will have the effect of clearing
-    the whole visible space of the terminal and moving the cursor to the
-    top left.  This does not do anything if not connected to a terminal.
-
-    .. versionadded:: 2.0
-    """
-    if not isatty(sys.stdout):
-        return
-    # If we're on Windows and we don't have colorama available, then we
-    # clear the screen by shelling out.  Otherwise we can use an escape
-    # sequence.
-    if WIN:
-        os.system('cls')
-    else:
-        sys.stdout.write('\033[2J\033[1;1H')
-
-
-def style(text, fg=None, bg=None, bold=None, dim=None, underline=None,
-          blink=None, reverse=None, reset=True):
-    """Styles a text with ANSI styles and returns the new string.  By
-    default the styling is self contained which means that at the end
-    of the string a reset code is issued.  This can be prevented by
-    passing ``reset=False``.
-
-    Examples::
-
-        click.echo(click.style('Hello World!', fg='green'))
-        click.echo(click.style('ATTENTION!', blink=True))
-        click.echo(click.style('Some things', reverse=True, fg='cyan'))
-
-    Supported color names:
-
-    * ``black`` (might be a gray)
-    * ``red``
-    * ``green``
-    * ``yellow`` (might be an orange)
-    * ``blue``
-    * ``magenta``
-    * ``cyan``
-    * ``white`` (might be light gray)
-    * ``bright_black``
-    * ``bright_red``
-    * ``bright_green``
-    * ``bright_yellow``
-    * ``bright_blue``
-    * ``bright_magenta``
-    * ``bright_cyan``
-    * ``bright_white``
-    * ``reset`` (reset the color code only)
-
-    .. versionadded:: 2.0
-
-    .. versionadded:: 7.0
-       Added support for bright colors.
-
-    :param text: the string to style with ansi codes.
-    :param fg: if provided this will become the foreground color.
-    :param bg: if provided this will become the background color.
-    :param bold: if provided this will enable or disable bold mode.
-    :param dim: if provided this will enable or disable dim mode.  This is
-                badly supported.
-    :param underline: if provided this will enable or disable underline.
-    :param blink: if provided this will enable or disable blinking.
-    :param reverse: if provided this will enable or disable inverse
-                    rendering (foreground becomes background and the
-                    other way round).
-    :param reset: by default a reset-all code is added at the end of the
-                  string which means that styles do not carry over.  This
-                  can be disabled to compose styles.
-    """
-    bits = []
-    if fg:
-        try:
-            bits.append('\033[%dm' % (_ansi_colors[fg]))
-        except KeyError:
-            raise TypeError('Unknown color %r' % fg)
-    if bg:
-        try:
-            bits.append('\033[%dm' % (_ansi_colors[bg] + 10))
-        except KeyError:
-            raise TypeError('Unknown color %r' % bg)
-    if bold is not None:
-        bits.append('\033[%dm' % (1 if bold else 22))
-    if dim is not None:
-        bits.append('\033[%dm' % (2 if dim else 22))
-    if underline is not None:
-        bits.append('\033[%dm' % (4 if underline else 24))
-    if blink is not None:
-        bits.append('\033[%dm' % (5 if blink else 25))
-    if reverse is not None:
-        bits.append('\033[%dm' % (7 if reverse else 27))
-    bits.append(text)
-    if reset:
-        bits.append(_ansi_reset_all)
-    return ''.join(bits)
-
-
-def unstyle(text):
-    """Removes ANSI styling information from a string.  Usually it's not
-    necessary to use this function as Click's echo function will
-    automatically remove styling if necessary.
-
-    .. versionadded:: 2.0
-
-    :param text: the text to remove style information from.
-    """
-    return strip_ansi(text)
-
-
-def secho(message=None, file=None, nl=True, err=False, color=None, **styles):
-    """This function combines :func:`echo` and :func:`style` into one
-    call.  As such the following two calls are the same::
-
-        click.secho('Hello World!', fg='green')
-        click.echo(click.style('Hello World!', fg='green'))
-
-    All keyword arguments are forwarded to the underlying functions
-    depending on which one they go with.
-
-    .. versionadded:: 2.0
-    """
-    if message is not None:
-        message = style(message, **styles)
-    return echo(message, file=file, nl=nl, err=err, color=color)
-
-
-def edit(text=None, editor=None, env=None, require_save=True,
-         extension='.txt', filename=None):
-    r"""Edits the given text in the defined editor.  If an editor is given
-    (should be the full path to the executable but the regular operating
-    system search path is used for finding the executable) it overrides
-    the detected editor.  Optionally, some environment variables can be
-    used.  If the editor is closed without changes, `None` is returned.  In
-    case a file is edited directly the return value is always `None` and
-    `require_save` and `extension` are ignored.
-
-    If the editor cannot be opened a :exc:`UsageError` is raised.
-
-    Note for Windows: to simplify cross-platform usage, the newlines are
-    automatically converted from POSIX to Windows and vice versa.  As such,
-    the message here will have ``\n`` as newline markers.
-
-    :param text: the text to edit.
-    :param editor: optionally the editor to use.  Defaults to automatic
-                   detection.
-    :param env: environment variables to forward to the editor.
-    :param require_save: if this is true, then not saving in the editor
-                         will make the return value become `None`.
-    :param extension: the extension to tell the editor about.  This defaults
-                      to `.txt` but changing this might change syntax
-                      highlighting.
-    :param filename: if provided it will edit this file instead of the
-                     provided text contents.  It will not use a temporary
-                     file as an indirection in that case.
-    """
-    from ._termui_impl import Editor
-    editor = Editor(editor=editor, env=env, require_save=require_save,
-                    extension=extension)
-    if filename is None:
-        return editor.edit(text)
-    editor.edit_file(filename)
-
-
-def launch(url, wait=False, locate=False):
-    """This function launches the given URL (or filename) in the default
-    viewer application for this file type.  If this is an executable, it
-    might launch the executable in a new session.  The return value is
-    the exit code of the launched application.  Usually, ``0`` indicates
-    success.
-
-    Examples::
-
-        click.launch('https://click.palletsprojects.com/')
-        click.launch('/my/downloaded/file', locate=True)
-
-    .. versionadded:: 2.0
-
-    :param url: URL or filename of the thing to launch.
-    :param wait: waits for the program to stop.
-    :param locate: if this is set to `True` then instead of launching the
-                   application associated with the URL it will attempt to
-                   launch a file manager with the file located.  This
-                   might have weird effects if the URL does not point to
-                   the filesystem.
-    """
-    from ._termui_impl import open_url
-    return open_url(url, wait=wait, locate=locate)
-
-
-# If this is provided, getchar() calls into this instead.  This is used
-# for unittesting purposes.
-_getchar = None
-
-
-def getchar(echo=False):
-    """Fetches a single character from the terminal and returns it.  This
-    will always return a unicode character and under certain rare
-    circumstances this might return more than one character.  The
-    situations which more than one character is returned is when for
-    whatever reason multiple characters end up in the terminal buffer or
-    standard input was not actually a terminal.
-
-    Note that this will always read from the terminal, even if something
-    is piped into the standard input.
-
-    Note for Windows: in rare cases when typing non-ASCII characters, this
-    function might wait for a second character and then return both at once.
-    This is because certain Unicode characters look like special-key markers.
-
-    .. versionadded:: 2.0
-
-    :param echo: if set to `True`, the character read will also show up on
-                 the terminal.  The default is to not show it.
-    """
-    f = _getchar
-    if f is None:
-        from ._termui_impl import getchar as f
-    return f(echo)
-
-
-def raw_terminal():
-    from ._termui_impl import raw_terminal as f
-    return f()
-
-
-def pause(info='Press any key to continue ...', err=False):
-    """This command stops execution and waits for the user to press any
-    key to continue.  This is similar to the Windows batch "pause"
-    command.  If the program is not run through a terminal, this command
-    will instead do nothing.
-
-    .. versionadded:: 2.0
-
-    .. versionadded:: 4.0
-       Added the `err` parameter.
-
-    :param info: the info string to print before pausing.
-    :param err: if set to message goes to ``stderr`` instead of
-                ``stdout``, the same as with echo.
-    """
-    if not isatty(sys.stdin) or not isatty(sys.stdout):
-        return
-    try:
-        if info:
-            echo(info, nl=False, err=err)
-        try:
-            getchar()
-        except (KeyboardInterrupt, EOFError):
-            pass
-    finally:
-        if info:
-            echo(err=err)
diff --git a/python/click/testing.py b/python/click/testing.py
deleted file mode 100644
index 1b2924e..0000000
--- a/python/click/testing.py
+++ /dev/null
@@ -1,374 +0,0 @@
-import os
-import sys
-import shutil
-import tempfile
-import contextlib
-import shlex
-
-from ._compat import iteritems, PY2, string_types
-
-
-# If someone wants to vendor click, we want to ensure the
-# correct package is discovered.  Ideally we could use a
-# relative import here but unfortunately Python does not
-# support that.
-clickpkg = sys.modules[__name__.rsplit('.', 1)[0]]
-
-
-if PY2:
-    from cStringIO import StringIO
-else:
-    import io
-    from ._compat import _find_binary_reader
-
-
-class EchoingStdin(object):
-
-    def __init__(self, input, output):
-        self._input = input
-        self._output = output
-
-    def __getattr__(self, x):
-        return getattr(self._input, x)
-
-    def _echo(self, rv):
-        self._output.write(rv)
-        return rv
-
-    def read(self, n=-1):
-        return self._echo(self._input.read(n))
-
-    def readline(self, n=-1):
-        return self._echo(self._input.readline(n))
-
-    def readlines(self):
-        return [self._echo(x) for x in self._input.readlines()]
-
-    def __iter__(self):
-        return iter(self._echo(x) for x in self._input)
-
-    def __repr__(self):
-        return repr(self._input)
-
-
-def make_input_stream(input, charset):
-    # Is already an input stream.
-    if hasattr(input, 'read'):
-        if PY2:
-            return input
-        rv = _find_binary_reader(input)
-        if rv is not None:
-            return rv
-        raise TypeError('Could not find binary reader for input stream.')
-
-    if input is None:
-        input = b''
-    elif not isinstance(input, bytes):
-        input = input.encode(charset)
-    if PY2:
-        return StringIO(input)
-    return io.BytesIO(input)
-
-
-class Result(object):
-    """Holds the captured result of an invoked CLI script."""
-
-    def __init__(self, runner, stdout_bytes, stderr_bytes, exit_code,
-                 exception, exc_info=None):
-        #: The runner that created the result
-        self.runner = runner
-        #: The standard output as bytes.
-        self.stdout_bytes = stdout_bytes
-        #: The standard error as bytes, or False(y) if not available
-        self.stderr_bytes = stderr_bytes
-        #: The exit code as integer.
-        self.exit_code = exit_code
-        #: The exception that happened if one did.
-        self.exception = exception
-        #: The traceback
-        self.exc_info = exc_info
-
-    @property
-    def output(self):
-        """The (standard) output as unicode string."""
-        return self.stdout
-
-    @property
-    def stdout(self):
-        """The standard output as unicode string."""
-        return self.stdout_bytes.decode(self.runner.charset, 'replace') \
-            .replace('\r\n', '\n')
-
-    @property
-    def stderr(self):
-        """The standard error as unicode string."""
-        if not self.stderr_bytes:
-            raise ValueError("stderr not separately captured")
-        return self.stderr_bytes.decode(self.runner.charset, 'replace') \
-            .replace('\r\n', '\n')
-
-
-    def __repr__(self):
-        return '<%s %s>' % (
-            type(self).__name__,
-            self.exception and repr(self.exception) or 'okay',
-        )
-
-
-class CliRunner(object):
-    """The CLI runner provides functionality to invoke a Click command line
-    script for unittesting purposes in a isolated environment.  This only
-    works in single-threaded systems without any concurrency as it changes the
-    global interpreter state.
-
-    :param charset: the character set for the input and output data.  This is
-                    UTF-8 by default and should not be changed currently as
-                    the reporting to Click only works in Python 2 properly.
-    :param env: a dictionary with environment variables for overriding.
-    :param echo_stdin: if this is set to `True`, then reading from stdin writes
-                       to stdout.  This is useful for showing examples in
-                       some circumstances.  Note that regular prompts
-                       will automatically echo the input.
-    :param mix_stderr: if this is set to `False`, then stdout and stderr are
-                       preserved as independent streams.  This is useful for
-                       Unix-philosophy apps that have predictable stdout and
-                       noisy stderr, such that each may be measured
-                       independently
-    """
-
-    def __init__(self, charset=None, env=None, echo_stdin=False,
-                 mix_stderr=True):
-        if charset is None:
-            charset = 'utf-8'
-        self.charset = charset
-        self.env = env or {}
-        self.echo_stdin = echo_stdin
-        self.mix_stderr = mix_stderr
-
-    def get_default_prog_name(self, cli):
-        """Given a command object it will return the default program name
-        for it.  The default is the `name` attribute or ``"root"`` if not
-        set.
-        """
-        return cli.name or 'root'
-
-    def make_env(self, overrides=None):
-        """Returns the environment overrides for invoking a script."""
-        rv = dict(self.env)
-        if overrides:
-            rv.update(overrides)
-        return rv
-
-    @contextlib.contextmanager
-    def isolation(self, input=None, env=None, color=False):
-        """A context manager that sets up the isolation for invoking of a
-        command line tool.  This sets up stdin with the given input data
-        and `os.environ` with the overrides from the given dictionary.
-        This also rebinds some internals in Click to be mocked (like the
-        prompt functionality).
-
-        This is automatically done in the :meth:`invoke` method.
-
-        .. versionadded:: 4.0
-           The ``color`` parameter was added.
-
-        :param input: the input stream to put into sys.stdin.
-        :param env: the environment overrides as dictionary.
-        :param color: whether the output should contain color codes. The
-                      application can still override this explicitly.
-        """
-        input = make_input_stream(input, self.charset)
-
-        old_stdin = sys.stdin
-        old_stdout = sys.stdout
-        old_stderr = sys.stderr
-        old_forced_width = clickpkg.formatting.FORCED_WIDTH
-        clickpkg.formatting.FORCED_WIDTH = 80
-
-        env = self.make_env(env)
-
-        if PY2:
-            bytes_output = StringIO()
-            if self.echo_stdin:
-                input = EchoingStdin(input, bytes_output)
-            sys.stdout = bytes_output
-            if not self.mix_stderr:
-                bytes_error = StringIO()
-                sys.stderr = bytes_error
-        else:
-            bytes_output = io.BytesIO()
-            if self.echo_stdin:
-                input = EchoingStdin(input, bytes_output)
-            input = io.TextIOWrapper(input, encoding=self.charset)
-            sys.stdout = io.TextIOWrapper(
-                bytes_output, encoding=self.charset)
-            if not self.mix_stderr:
-                bytes_error = io.BytesIO()
-                sys.stderr = io.TextIOWrapper(
-                    bytes_error, encoding=self.charset)
-
-        if self.mix_stderr:
-            sys.stderr = sys.stdout
-
-        sys.stdin = input
-
-        def visible_input(prompt=None):
-            sys.stdout.write(prompt or '')
-            val = input.readline().rstrip('\r\n')
-            sys.stdout.write(val + '\n')
-            sys.stdout.flush()
-            return val
-
-        def hidden_input(prompt=None):
-            sys.stdout.write((prompt or '') + '\n')
-            sys.stdout.flush()
-            return input.readline().rstrip('\r\n')
-
-        def _getchar(echo):
-            char = sys.stdin.read(1)
-            if echo:
-                sys.stdout.write(char)
-                sys.stdout.flush()
-            return char
-
-        default_color = color
-
-        def should_strip_ansi(stream=None, color=None):
-            if color is None:
-                return not default_color
-            return not color
-
-        old_visible_prompt_func = clickpkg.termui.visible_prompt_func
-        old_hidden_prompt_func = clickpkg.termui.hidden_prompt_func
-        old__getchar_func = clickpkg.termui._getchar
-        old_should_strip_ansi = clickpkg.utils.should_strip_ansi
-        clickpkg.termui.visible_prompt_func = visible_input
-        clickpkg.termui.hidden_prompt_func = hidden_input
-        clickpkg.termui._getchar = _getchar
-        clickpkg.utils.should_strip_ansi = should_strip_ansi
-
-        old_env = {}
-        try:
-            for key, value in iteritems(env):
-                old_env[key] = os.environ.get(key)
-                if value is None:
-                    try:
-                        del os.environ[key]
-                    except Exception:
-                        pass
-                else:
-                    os.environ[key] = value
-            yield (bytes_output, not self.mix_stderr and bytes_error)
-        finally:
-            for key, value in iteritems(old_env):
-                if value is None:
-                    try:
-                        del os.environ[key]
-                    except Exception:
-                        pass
-                else:
-                    os.environ[key] = value
-            sys.stdout = old_stdout
-            sys.stderr = old_stderr
-            sys.stdin = old_stdin
-            clickpkg.termui.visible_prompt_func = old_visible_prompt_func
-            clickpkg.termui.hidden_prompt_func = old_hidden_prompt_func
-            clickpkg.termui._getchar = old__getchar_func
-            clickpkg.utils.should_strip_ansi = old_should_strip_ansi
-            clickpkg.formatting.FORCED_WIDTH = old_forced_width
-
-    def invoke(self, cli, args=None, input=None, env=None,
-               catch_exceptions=True, color=False, mix_stderr=False, **extra):
-        """Invokes a command in an isolated environment.  The arguments are
-        forwarded directly to the command line script, the `extra` keyword
-        arguments are passed to the :meth:`~clickpkg.Command.main` function of
-        the command.
-
-        This returns a :class:`Result` object.
-
-        .. versionadded:: 3.0
-           The ``catch_exceptions`` parameter was added.
-
-        .. versionchanged:: 3.0
-           The result object now has an `exc_info` attribute with the
-           traceback if available.
-
-        .. versionadded:: 4.0
-           The ``color`` parameter was added.
-
-        :param cli: the command to invoke
-        :param args: the arguments to invoke. It may be given as an iterable
-                     or a string. When given as string it will be interpreted
-                     as a Unix shell command. More details at
-                     :func:`shlex.split`.
-        :param input: the input data for `sys.stdin`.
-        :param env: the environment overrides.
-        :param catch_exceptions: Whether to catch any other exceptions than
-                                 ``SystemExit``.
-        :param extra: the keyword arguments to pass to :meth:`main`.
-        :param color: whether the output should contain color codes. The
-                      application can still override this explicitly.
-        """
-        exc_info = None
-        with self.isolation(input=input, env=env, color=color) as outstreams:
-            exception = None
-            exit_code = 0
-
-            if isinstance(args, string_types):
-                args = shlex.split(args)
-
-            try:
-                prog_name = extra.pop("prog_name")
-            except KeyError:
-                prog_name = self.get_default_prog_name(cli)
-
-            try:
-                cli.main(args=args or (), prog_name=prog_name, **extra)
-            except SystemExit as e:
-                exc_info = sys.exc_info()
-                exit_code = e.code
-                if exit_code is None:
-                    exit_code = 0
-
-                if exit_code != 0:
-                    exception = e
-
-                if not isinstance(exit_code, int):
-                    sys.stdout.write(str(exit_code))
-                    sys.stdout.write('\n')
-                    exit_code = 1
-
-            except Exception as e:
-                if not catch_exceptions:
-                    raise
-                exception = e
-                exit_code = 1
-                exc_info = sys.exc_info()
-            finally:
-                sys.stdout.flush()
-                stdout = outstreams[0].getvalue()
-                stderr = outstreams[1] and outstreams[1].getvalue()
-
-        return Result(runner=self,
-                      stdout_bytes=stdout,
-                      stderr_bytes=stderr,
-                      exit_code=exit_code,
-                      exception=exception,
-                      exc_info=exc_info)
-
-    @contextlib.contextmanager
-    def isolated_filesystem(self):
-        """A context manager that creates a temporary folder and changes
-        the current working directory to it for isolated filesystem tests.
-        """
-        cwd = os.getcwd()
-        t = tempfile.mkdtemp()
-        os.chdir(t)
-        try:
-            yield t
-        finally:
-            os.chdir(cwd)
-            try:
-                shutil.rmtree(t)
-            except (OSError, IOError):
-                pass
diff --git a/python/click/types.py b/python/click/types.py
deleted file mode 100644
index 1f88032..0000000
--- a/python/click/types.py
+++ /dev/null
@@ -1,668 +0,0 @@
-import os
-import stat
-from datetime import datetime
-
-from ._compat import open_stream, text_type, filename_to_ui, \
-    get_filesystem_encoding, get_streerror, _get_argv_encoding, PY2
-from .exceptions import BadParameter
-from .utils import safecall, LazyFile
-
-
-class ParamType(object):
-    """Helper for converting values through types.  The following is
-    necessary for a valid type:
-
-    *   it needs a name
-    *   it needs to pass through None unchanged
-    *   it needs to convert from a string
-    *   it needs to convert its result type through unchanged
-        (eg: needs to be idempotent)
-    *   it needs to be able to deal with param and context being `None`.
-        This can be the case when the object is used with prompt
-        inputs.
-    """
-    is_composite = False
-
-    #: the descriptive name of this type
-    name = None
-
-    #: if a list of this type is expected and the value is pulled from a
-    #: string environment variable, this is what splits it up.  `None`
-    #: means any whitespace.  For all parameters the general rule is that
-    #: whitespace splits them up.  The exception are paths and files which
-    #: are split by ``os.path.pathsep`` by default (":" on Unix and ";" on
-    #: Windows).
-    envvar_list_splitter = None
-
-    def __call__(self, value, param=None, ctx=None):
-        if value is not None:
-            return self.convert(value, param, ctx)
-
-    def get_metavar(self, param):
-        """Returns the metavar default for this param if it provides one."""
-
-    def get_missing_message(self, param):
-        """Optionally might return extra information about a missing
-        parameter.
-
-        .. versionadded:: 2.0
-        """
-
-    def convert(self, value, param, ctx):
-        """Converts the value.  This is not invoked for values that are
-        `None` (the missing value).
-        """
-        return value
-
-    def split_envvar_value(self, rv):
-        """Given a value from an environment variable this splits it up
-        into small chunks depending on the defined envvar list splitter.
-
-        If the splitter is set to `None`, which means that whitespace splits,
-        then leading and trailing whitespace is ignored.  Otherwise, leading
-        and trailing splitters usually lead to empty items being included.
-        """
-        return (rv or '').split(self.envvar_list_splitter)
-
-    def fail(self, message, param=None, ctx=None):
-        """Helper method to fail with an invalid value message."""
-        raise BadParameter(message, ctx=ctx, param=param)
-
-
-class CompositeParamType(ParamType):
-    is_composite = True
-
-    @property
-    def arity(self):
-        raise NotImplementedError()
-
-
-class FuncParamType(ParamType):
-
-    def __init__(self, func):
-        self.name = func.__name__
-        self.func = func
-
-    def convert(self, value, param, ctx):
-        try:
-            return self.func(value)
-        except ValueError:
-            try:
-                value = text_type(value)
-            except UnicodeError:
-                value = str(value).decode('utf-8', 'replace')
-            self.fail(value, param, ctx)
-
-
-class UnprocessedParamType(ParamType):
-    name = 'text'
-
-    def convert(self, value, param, ctx):
-        return value
-
-    def __repr__(self):
-        return 'UNPROCESSED'
-
-
-class StringParamType(ParamType):
-    name = 'text'
-
-    def convert(self, value, param, ctx):
-        if isinstance(value, bytes):
-            enc = _get_argv_encoding()
-            try:
-                value = value.decode(enc)
-            except UnicodeError:
-                fs_enc = get_filesystem_encoding()
-                if fs_enc != enc:
-                    try:
-                        value = value.decode(fs_enc)
-                    except UnicodeError:
-                        value = value.decode('utf-8', 'replace')
-            return value
-        return value
-
-    def __repr__(self):
-        return 'STRING'
-
-
-class Choice(ParamType):
-    """The choice type allows a value to be checked against a fixed set
-    of supported values. All of these values have to be strings.
-
-    You should only pass a list or tuple of choices. Other iterables
-    (like generators) may lead to surprising results.
-
-    See :ref:`choice-opts` for an example.
-
-    :param case_sensitive: Set to false to make choices case
-        insensitive. Defaults to true.
-    """
-
-    name = 'choice'
-
-    def __init__(self, choices, case_sensitive=True):
-        self.choices = choices
-        self.case_sensitive = case_sensitive
-
-    def get_metavar(self, param):
-        return '[%s]' % '|'.join(self.choices)
-
-    def get_missing_message(self, param):
-        return 'Choose from:\n\t%s.' % ',\n\t'.join(self.choices)
-
-    def convert(self, value, param, ctx):
-        # Exact match
-        if value in self.choices:
-            return value
-
-        # Match through normalization and case sensitivity
-        # first do token_normalize_func, then lowercase
-        # preserve original `value` to produce an accurate message in
-        # `self.fail`
-        normed_value = value
-        normed_choices = self.choices
-
-        if ctx is not None and \
-           ctx.token_normalize_func is not None:
-            normed_value = ctx.token_normalize_func(value)
-            normed_choices = [ctx.token_normalize_func(choice) for choice in
-                              self.choices]
-
-        if not self.case_sensitive:
-            normed_value = normed_value.lower()
-            normed_choices = [choice.lower() for choice in normed_choices]
-
-        if normed_value in normed_choices:
-            return normed_value
-
-        self.fail('invalid choice: %s. (choose from %s)' %
-                  (value, ', '.join(self.choices)), param, ctx)
-
-    def __repr__(self):
-        return 'Choice(%r)' % list(self.choices)
-
-
-class DateTime(ParamType):
-    """The DateTime type converts date strings into `datetime` objects.
-
-    The format strings which are checked are configurable, but default to some
-    common (non-timezone aware) ISO 8601 formats.
-
-    When specifying *DateTime* formats, you should only pass a list or a tuple.
-    Other iterables, like generators, may lead to surprising results.
-
-    The format strings are processed using ``datetime.strptime``, and this
-    consequently defines the format strings which are allowed.
-
-    Parsing is tried using each format, in order, and the first format which
-    parses successfully is used.
-
-    :param formats: A list or tuple of date format strings, in the order in
-                    which they should be tried. Defaults to
-                    ``'%Y-%m-%d'``, ``'%Y-%m-%dT%H:%M:%S'``,
-                    ``'%Y-%m-%d %H:%M:%S'``.
-    """
-    name = 'datetime'
-
-    def __init__(self, formats=None):
-        self.formats = formats or [
-            '%Y-%m-%d',
-            '%Y-%m-%dT%H:%M:%S',
-            '%Y-%m-%d %H:%M:%S'
-        ]
-
-    def get_metavar(self, param):
-        return '[{}]'.format('|'.join(self.formats))
-
-    def _try_to_convert_date(self, value, format):
-        try:
-            return datetime.strptime(value, format)
-        except ValueError:
-            return None
-
-    def convert(self, value, param, ctx):
-        # Exact match
-        for format in self.formats:
-            dtime = self._try_to_convert_date(value, format)
-            if dtime:
-                return dtime
-
-        self.fail(
-            'invalid datetime format: {}. (choose from {})'.format(
-                value, ', '.join(self.formats)))
-
-    def __repr__(self):
-        return 'DateTime'
-
-
-class IntParamType(ParamType):
-    name = 'integer'
-
-    def convert(self, value, param, ctx):
-        try:
-            return int(value)
-        except (ValueError, UnicodeError):
-            self.fail('%s is not a valid integer' % value, param, ctx)
-
-    def __repr__(self):
-        return 'INT'
-
-
-class IntRange(IntParamType):
-    """A parameter that works similar to :data:`click.INT` but restricts
-    the value to fit into a range.  The default behavior is to fail if the
-    value falls outside the range, but it can also be silently clamped
-    between the two edges.
-
-    See :ref:`ranges` for an example.
-    """
-    name = 'integer range'
-
-    def __init__(self, min=None, max=None, clamp=False):
-        self.min = min
-        self.max = max
-        self.clamp = clamp
-
-    def convert(self, value, param, ctx):
-        rv = IntParamType.convert(self, value, param, ctx)
-        if self.clamp:
-            if self.min is not None and rv < self.min:
-                return self.min
-            if self.max is not None and rv > self.max:
-                return self.max
-        if self.min is not None and rv < self.min or \
-           self.max is not None and rv > self.max:
-            if self.min is None:
-                self.fail('%s is bigger than the maximum valid value '
-                          '%s.' % (rv, self.max), param, ctx)
-            elif self.max is None:
-                self.fail('%s is smaller than the minimum valid value '
-                          '%s.' % (rv, self.min), param, ctx)
-            else:
-                self.fail('%s is not in the valid range of %s to %s.'
-                          % (rv, self.min, self.max), param, ctx)
-        return rv
-
-    def __repr__(self):
-        return 'IntRange(%r, %r)' % (self.min, self.max)
-
-
-class FloatParamType(ParamType):
-    name = 'float'
-
-    def convert(self, value, param, ctx):
-        try:
-            return float(value)
-        except (UnicodeError, ValueError):
-            self.fail('%s is not a valid floating point value' %
-                      value, param, ctx)
-
-    def __repr__(self):
-        return 'FLOAT'
-
-
-class FloatRange(FloatParamType):
-    """A parameter that works similar to :data:`click.FLOAT` but restricts
-    the value to fit into a range.  The default behavior is to fail if the
-    value falls outside the range, but it can also be silently clamped
-    between the two edges.
-
-    See :ref:`ranges` for an example.
-    """
-    name = 'float range'
-
-    def __init__(self, min=None, max=None, clamp=False):
-        self.min = min
-        self.max = max
-        self.clamp = clamp
-
-    def convert(self, value, param, ctx):
-        rv = FloatParamType.convert(self, value, param, ctx)
-        if self.clamp:
-            if self.min is not None and rv < self.min:
-                return self.min
-            if self.max is not None and rv > self.max:
-                return self.max
-        if self.min is not None and rv < self.min or \
-           self.max is not None and rv > self.max:
-            if self.min is None:
-                self.fail('%s is bigger than the maximum valid value '
-                          '%s.' % (rv, self.max), param, ctx)
-            elif self.max is None:
-                self.fail('%s is smaller than the minimum valid value '
-                          '%s.' % (rv, self.min), param, ctx)
-            else:
-                self.fail('%s is not in the valid range of %s to %s.'
-                          % (rv, self.min, self.max), param, ctx)
-        return rv
-
-    def __repr__(self):
-        return 'FloatRange(%r, %r)' % (self.min, self.max)
-
-
-class BoolParamType(ParamType):
-    name = 'boolean'
-
-    def convert(self, value, param, ctx):
-        if isinstance(value, bool):
-            return bool(value)
-        value = value.lower()
-        if value in ('true', 't', '1', 'yes', 'y'):
-            return True
-        elif value in ('false', 'f', '0', 'no', 'n'):
-            return False
-        self.fail('%s is not a valid boolean' % value, param, ctx)
-
-    def __repr__(self):
-        return 'BOOL'
-
-
-class UUIDParameterType(ParamType):
-    name = 'uuid'
-
-    def convert(self, value, param, ctx):
-        import uuid
-        try:
-            if PY2 and isinstance(value, text_type):
-                value = value.encode('ascii')
-            return uuid.UUID(value)
-        except (UnicodeError, ValueError):
-            self.fail('%s is not a valid UUID value' % value, param, ctx)
-
-    def __repr__(self):
-        return 'UUID'
-
-
-class File(ParamType):
-    """Declares a parameter to be a file for reading or writing.  The file
-    is automatically closed once the context tears down (after the command
-    finished working).
-
-    Files can be opened for reading or writing.  The special value ``-``
-    indicates stdin or stdout depending on the mode.
-
-    By default, the file is opened for reading text data, but it can also be
-    opened in binary mode or for writing.  The encoding parameter can be used
-    to force a specific encoding.
-
-    The `lazy` flag controls if the file should be opened immediately or upon
-    first IO. The default is to be non-lazy for standard input and output
-    streams as well as files opened for reading, `lazy` otherwise. When opening a
-    file lazily for reading, it is still opened temporarily for validation, but
-    will not be held open until first IO. lazy is mainly useful when opening
-    for writing to avoid creating the file until it is needed.
-
-    Starting with Click 2.0, files can also be opened atomically in which
-    case all writes go into a separate file in the same folder and upon
-    completion the file will be moved over to the original location.  This
-    is useful if a file regularly read by other users is modified.
-
-    See :ref:`file-args` for more information.
-    """
-    name = 'filename'
-    envvar_list_splitter = os.path.pathsep
-
-    def __init__(self, mode='r', encoding=None, errors='strict', lazy=None,
-                 atomic=False):
-        self.mode = mode
-        self.encoding = encoding
-        self.errors = errors
-        self.lazy = lazy
-        self.atomic = atomic
-
-    def resolve_lazy_flag(self, value):
-        if self.lazy is not None:
-            return self.lazy
-        if value == '-':
-            return False
-        elif 'w' in self.mode:
-            return True
-        return False
-
-    def convert(self, value, param, ctx):
-        try:
-            if hasattr(value, 'read') or hasattr(value, 'write'):
-                return value
-
-            lazy = self.resolve_lazy_flag(value)
-
-            if lazy:
-                f = LazyFile(value, self.mode, self.encoding, self.errors,
-                             atomic=self.atomic)
-                if ctx is not None:
-                    ctx.call_on_close(f.close_intelligently)
-                return f
-
-            f, should_close = open_stream(value, self.mode,
-                                          self.encoding, self.errors,
-                                          atomic=self.atomic)
-            # If a context is provided, we automatically close the file
-            # at the end of the context execution (or flush out).  If a
-            # context does not exist, it's the caller's responsibility to
-            # properly close the file.  This for instance happens when the
-            # type is used with prompts.
-            if ctx is not None:
-                if should_close:
-                    ctx.call_on_close(safecall(f.close))
-                else:
-                    ctx.call_on_close(safecall(f.flush))
-            return f
-        except (IOError, OSError) as e:
-            self.fail('Could not open file: %s: %s' % (
-                filename_to_ui(value),
-                get_streerror(e),
-            ), param, ctx)
-
-
-class Path(ParamType):
-    """The path type is similar to the :class:`File` type but it performs
-    different checks.  First of all, instead of returning an open file
-    handle it returns just the filename.  Secondly, it can perform various
-    basic checks about what the file or directory should be.
-
-    .. versionchanged:: 6.0
-       `allow_dash` was added.
-
-    :param exists: if set to true, the file or directory needs to exist for
-                   this value to be valid.  If this is not required and a
-                   file does indeed not exist, then all further checks are
-                   silently skipped.
-    :param file_okay: controls if a file is a possible value.
-    :param dir_okay: controls if a directory is a possible value.
-    :param writable: if true, a writable check is performed.
-    :param readable: if true, a readable check is performed.
-    :param resolve_path: if this is true, then the path is fully resolved
-                         before the value is passed onwards.  This means
-                         that it's absolute and symlinks are resolved.  It
-                         will not expand a tilde-prefix, as this is
-                         supposed to be done by the shell only.
-    :param allow_dash: If this is set to `True`, a single dash to indicate
-                       standard streams is permitted.
-    :param path_type: optionally a string type that should be used to
-                      represent the path.  The default is `None` which
-                      means the return value will be either bytes or
-                      unicode depending on what makes most sense given the
-                      input data Click deals with.
-    """
-    envvar_list_splitter = os.path.pathsep
-
-    def __init__(self, exists=False, file_okay=True, dir_okay=True,
-                 writable=False, readable=True, resolve_path=False,
-                 allow_dash=False, path_type=None):
-        self.exists = exists
-        self.file_okay = file_okay
-        self.dir_okay = dir_okay
-        self.writable = writable
-        self.readable = readable
-        self.resolve_path = resolve_path
-        self.allow_dash = allow_dash
-        self.type = path_type
-
-        if self.file_okay and not self.dir_okay:
-            self.name = 'file'
-            self.path_type = 'File'
-        elif self.dir_okay and not self.file_okay:
-            self.name = 'directory'
-            self.path_type = 'Directory'
-        else:
-            self.name = 'path'
-            self.path_type = 'Path'
-
-    def coerce_path_result(self, rv):
-        if self.type is not None and not isinstance(rv, self.type):
-            if self.type is text_type:
-                rv = rv.decode(get_filesystem_encoding())
-            else:
-                rv = rv.encode(get_filesystem_encoding())
-        return rv
-
-    def convert(self, value, param, ctx):
-        rv = value
-
-        is_dash = self.file_okay and self.allow_dash and rv in (b'-', '-')
-
-        if not is_dash:
-            if self.resolve_path:
-                rv = os.path.realpath(rv)
-
-            try:
-                st = os.stat(rv)
-            except OSError:
-                if not self.exists:
-                    return self.coerce_path_result(rv)
-                self.fail('%s "%s" does not exist.' % (
-                    self.path_type,
-                    filename_to_ui(value)
-                ), param, ctx)
-
-            if not self.file_okay and stat.S_ISREG(st.st_mode):
-                self.fail('%s "%s" is a file.' % (
-                    self.path_type,
-                    filename_to_ui(value)
-                ), param, ctx)
-            if not self.dir_okay and stat.S_ISDIR(st.st_mode):
-                self.fail('%s "%s" is a directory.' % (
-                    self.path_type,
-                    filename_to_ui(value)
-                ), param, ctx)
-            if self.writable and not os.access(value, os.W_OK):
-                self.fail('%s "%s" is not writable.' % (
-                    self.path_type,
-                    filename_to_ui(value)
-                ), param, ctx)
-            if self.readable and not os.access(value, os.R_OK):
-                self.fail('%s "%s" is not readable.' % (
-                    self.path_type,
-                    filename_to_ui(value)
-                ), param, ctx)
-
-        return self.coerce_path_result(rv)
-
-
-class Tuple(CompositeParamType):
-    """The default behavior of Click is to apply a type on a value directly.
-    This works well in most cases, except for when `nargs` is set to a fixed
-    count and different types should be used for different items.  In this
-    case the :class:`Tuple` type can be used.  This type can only be used
-    if `nargs` is set to a fixed number.
-
-    For more information see :ref:`tuple-type`.
-
-    This can be selected by using a Python tuple literal as a type.
-
-    :param types: a list of types that should be used for the tuple items.
-    """
-
-    def __init__(self, types):
-        self.types = [convert_type(ty) for ty in types]
-
-    @property
-    def name(self):
-        return "<" + " ".join(ty.name for ty in self.types) + ">"
-
-    @property
-    def arity(self):
-        return len(self.types)
-
-    def convert(self, value, param, ctx):
-        if len(value) != len(self.types):
-            raise TypeError('It would appear that nargs is set to conflict '
-                            'with the composite type arity.')
-        return tuple(ty(x, param, ctx) for ty, x in zip(self.types, value))
-
-
-def convert_type(ty, default=None):
-    """Converts a callable or python ty into the most appropriate param
-    ty.
-    """
-    guessed_type = False
-    if ty is None and default is not None:
-        if isinstance(default, tuple):
-            ty = tuple(map(type, default))
-        else:
-            ty = type(default)
-        guessed_type = True
-
-    if isinstance(ty, tuple):
-        return Tuple(ty)
-    if isinstance(ty, ParamType):
-        return ty
-    if ty is text_type or ty is str or ty is None:
-        return STRING
-    if ty is int:
-        return INT
-    # Booleans are only okay if not guessed.  This is done because for
-    # flags the default value is actually a bit of a lie in that it
-    # indicates which of the flags is the one we want.  See get_default()
-    # for more information.
-    if ty is bool and not guessed_type:
-        return BOOL
-    if ty is float:
-        return FLOAT
-    if guessed_type:
-        return STRING
-
-    # Catch a common mistake
-    if __debug__:
-        try:
-            if issubclass(ty, ParamType):
-                raise AssertionError('Attempted to use an uninstantiated '
-                                     'parameter type (%s).' % ty)
-        except TypeError:
-            pass
-    return FuncParamType(ty)
-
-
-#: A dummy parameter type that just does nothing.  From a user's
-#: perspective this appears to just be the same as `STRING` but internally
-#: no string conversion takes place.  This is necessary to achieve the
-#: same bytes/unicode behavior on Python 2/3 in situations where you want
-#: to not convert argument types.  This is usually useful when working
-#: with file paths as they can appear in bytes and unicode.
-#:
-#: For path related uses the :class:`Path` type is a better choice but
-#: there are situations where an unprocessed type is useful which is why
-#: it is is provided.
-#:
-#: .. versionadded:: 4.0
-UNPROCESSED = UnprocessedParamType()
-
-#: A unicode string parameter type which is the implicit default.  This
-#: can also be selected by using ``str`` as type.
-STRING = StringParamType()
-
-#: An integer parameter.  This can also be selected by using ``int`` as
-#: type.
-INT = IntParamType()
-
-#: A floating point value parameter.  This can also be selected by using
-#: ``float`` as type.
-FLOAT = FloatParamType()
-
-#: A boolean parameter.  This is the default for boolean flags.  This can
-#: also be selected by using ``bool`` as a type.
-BOOL = BoolParamType()
-
-#: A UUID parameter.
-UUID = UUIDParameterType()
diff --git a/python/click/utils.py b/python/click/utils.py
deleted file mode 100644
index fc84369..0000000
--- a/python/click/utils.py
+++ /dev/null
@@ -1,440 +0,0 @@
-import os
-import sys
-
-from .globals import resolve_color_default
-
-from ._compat import text_type, open_stream, get_filesystem_encoding, \
-    get_streerror, string_types, PY2, binary_streams, text_streams, \
-    filename_to_ui, auto_wrap_for_ansi, strip_ansi, should_strip_ansi, \
-    _default_text_stdout, _default_text_stderr, is_bytes, WIN
-
-if not PY2:
-    from ._compat import _find_binary_writer
-elif WIN:
-    from ._winconsole import _get_windows_argv, \
-         _hash_py_argv, _initial_argv_hash
-
-
-echo_native_types = string_types + (bytes, bytearray)
-
-
-def _posixify(name):
-    return '-'.join(name.split()).lower()
-
-
-def safecall(func):
-    """Wraps a function so that it swallows exceptions."""
-    def wrapper(*args, **kwargs):
-        try:
-            return func(*args, **kwargs)
-        except Exception:
-            pass
-    return wrapper
-
-
-def make_str(value):
-    """Converts a value into a valid string."""
-    if isinstance(value, bytes):
-        try:
-            return value.decode(get_filesystem_encoding())
-        except UnicodeError:
-            return value.decode('utf-8', 'replace')
-    return text_type(value)
-
-
-def make_default_short_help(help, max_length=45):
-    """Return a condensed version of help string."""
-    words = help.split()
-    total_length = 0
-    result = []
-    done = False
-
-    for word in words:
-        if word[-1:] == '.':
-            done = True
-        new_length = result and 1 + len(word) or len(word)
-        if total_length + new_length > max_length:
-            result.append('...')
-            done = True
-        else:
-            if result:
-                result.append(' ')
-            result.append(word)
-        if done:
-            break
-        total_length += new_length
-
-    return ''.join(result)
-
-
-class LazyFile(object):
-    """A lazy file works like a regular file but it does not fully open
-    the file but it does perform some basic checks early to see if the
-    filename parameter does make sense.  This is useful for safely opening
-    files for writing.
-    """
-
-    def __init__(self, filename, mode='r', encoding=None, errors='strict',
-                 atomic=False):
-        self.name = filename
-        self.mode = mode
-        self.encoding = encoding
-        self.errors = errors
-        self.atomic = atomic
-
-        if filename == '-':
-            self._f, self.should_close = open_stream(filename, mode,
-                                                     encoding, errors)
-        else:
-            if 'r' in mode:
-                # Open and close the file in case we're opening it for
-                # reading so that we can catch at least some errors in
-                # some cases early.
-                open(filename, mode).close()
-            self._f = None
-            self.should_close = True
-
-    def __getattr__(self, name):
-        return getattr(self.open(), name)
-
-    def __repr__(self):
-        if self._f is not None:
-            return repr(self._f)
-        return '<unopened file %r %s>' % (self.name, self.mode)
-
-    def open(self):
-        """Opens the file if it's not yet open.  This call might fail with
-        a :exc:`FileError`.  Not handling this error will produce an error
-        that Click shows.
-        """
-        if self._f is not None:
-            return self._f
-        try:
-            rv, self.should_close = open_stream(self.name, self.mode,
-                                                self.encoding,
-                                                self.errors,
-                                                atomic=self.atomic)
-        except (IOError, OSError) as e:
-            from .exceptions import FileError
-            raise FileError(self.name, hint=get_streerror(e))
-        self._f = rv
-        return rv
-
-    def close(self):
-        """Closes the underlying file, no matter what."""
-        if self._f is not None:
-            self._f.close()
-
-    def close_intelligently(self):
-        """This function only closes the file if it was opened by the lazy
-        file wrapper.  For instance this will never close stdin.
-        """
-        if self.should_close:
-            self.close()
-
-    def __enter__(self):
-        return self
-
-    def __exit__(self, exc_type, exc_value, tb):
-        self.close_intelligently()
-
-    def __iter__(self):
-        self.open()
-        return iter(self._f)
-
-
-class KeepOpenFile(object):
-
-    def __init__(self, file):
-        self._file = file
-
-    def __getattr__(self, name):
-        return getattr(self._file, name)
-
-    def __enter__(self):
-        return self
-
-    def __exit__(self, exc_type, exc_value, tb):
-        pass
-
-    def __repr__(self):
-        return repr(self._file)
-
-    def __iter__(self):
-        return iter(self._file)
-
-
-def echo(message=None, file=None, nl=True, err=False, color=None):
-    """Prints a message plus a newline to the given file or stdout.  On
-    first sight, this looks like the print function, but it has improved
-    support for handling Unicode and binary data that does not fail no
-    matter how badly configured the system is.
-
-    Primarily it means that you can print binary data as well as Unicode
-    data on both 2.x and 3.x to the given file in the most appropriate way
-    possible.  This is a very carefree function in that it will try its
-    best to not fail.  As of Click 6.0 this includes support for unicode
-    output on the Windows console.
-
-    In addition to that, if `colorama`_ is installed, the echo function will
-    also support clever handling of ANSI codes.  Essentially it will then
-    do the following:
-
-    -   add transparent handling of ANSI color codes on Windows.
-    -   hide ANSI codes automatically if the destination file is not a
-        terminal.
-
-    .. _colorama: https://pypi.org/project/colorama/
-
-    .. versionchanged:: 6.0
-       As of Click 6.0 the echo function will properly support unicode
-       output on the windows console.  Not that click does not modify
-       the interpreter in any way which means that `sys.stdout` or the
-       print statement or function will still not provide unicode support.
-
-    .. versionchanged:: 2.0
-       Starting with version 2.0 of Click, the echo function will work
-       with colorama if it's installed.
-
-    .. versionadded:: 3.0
-       The `err` parameter was added.
-
-    .. versionchanged:: 4.0
-       Added the `color` flag.
-
-    :param message: the message to print
-    :param file: the file to write to (defaults to ``stdout``)
-    :param err: if set to true the file defaults to ``stderr`` instead of
-                ``stdout``.  This is faster and easier than calling
-                :func:`get_text_stderr` yourself.
-    :param nl: if set to `True` (the default) a newline is printed afterwards.
-    :param color: controls if the terminal supports ANSI colors or not.  The
-                  default is autodetection.
-    """
-    if file is None:
-        if err:
-            file = _default_text_stderr()
-        else:
-            file = _default_text_stdout()
-
-    # Convert non bytes/text into the native string type.
-    if message is not None and not isinstance(message, echo_native_types):
-        message = text_type(message)
-
-    if nl:
-        message = message or u''
-        if isinstance(message, text_type):
-            message += u'\n'
-        else:
-            message += b'\n'
-
-    # If there is a message, and we're in Python 3, and the value looks
-    # like bytes, we manually need to find the binary stream and write the
-    # message in there.  This is done separately so that most stream
-    # types will work as you would expect.  Eg: you can write to StringIO
-    # for other cases.
-    if message and not PY2 and is_bytes(message):
-        binary_file = _find_binary_writer(file)
-        if binary_file is not None:
-            file.flush()
-            binary_file.write(message)
-            binary_file.flush()
-            return
-
-    # ANSI-style support.  If there is no message or we are dealing with
-    # bytes nothing is happening.  If we are connected to a file we want
-    # to strip colors.  If we are on windows we either wrap the stream
-    # to strip the color or we use the colorama support to translate the
-    # ansi codes to API calls.
-    if message and not is_bytes(message):
-        color = resolve_color_default(color)
-        if should_strip_ansi(file, color):
-            message = strip_ansi(message)
-        elif WIN:
-            if auto_wrap_for_ansi is not None:
-                file = auto_wrap_for_ansi(file)
-            elif not color:
-                message = strip_ansi(message)
-
-    if message:
-        file.write(message)
-    file.flush()
-
-
-def get_binary_stream(name):
-    """Returns a system stream for byte processing.  This essentially
-    returns the stream from the sys module with the given name but it
-    solves some compatibility issues between different Python versions.
-    Primarily this function is necessary for getting binary streams on
-    Python 3.
-
-    :param name: the name of the stream to open.  Valid names are ``'stdin'``,
-                 ``'stdout'`` and ``'stderr'``
-    """
-    opener = binary_streams.get(name)
-    if opener is None:
-        raise TypeError('Unknown standard stream %r' % name)
-    return opener()
-
-
-def get_text_stream(name, encoding=None, errors='strict'):
-    """Returns a system stream for text processing.  This usually returns
-    a wrapped stream around a binary stream returned from
-    :func:`get_binary_stream` but it also can take shortcuts on Python 3
-    for already correctly configured streams.
-
-    :param name: the name of the stream to open.  Valid names are ``'stdin'``,
-                 ``'stdout'`` and ``'stderr'``
-    :param encoding: overrides the detected default encoding.
-    :param errors: overrides the default error mode.
-    """
-    opener = text_streams.get(name)
-    if opener is None:
-        raise TypeError('Unknown standard stream %r' % name)
-    return opener(encoding, errors)
-
-
-def open_file(filename, mode='r', encoding=None, errors='strict',
-              lazy=False, atomic=False):
-    """This is similar to how the :class:`File` works but for manual
-    usage.  Files are opened non lazy by default.  This can open regular
-    files as well as stdin/stdout if ``'-'`` is passed.
-
-    If stdin/stdout is returned the stream is wrapped so that the context
-    manager will not close the stream accidentally.  This makes it possible
-    to always use the function like this without having to worry to
-    accidentally close a standard stream::
-
-        with open_file(filename) as f:
-            ...
-
-    .. versionadded:: 3.0
-
-    :param filename: the name of the file to open (or ``'-'`` for stdin/stdout).
-    :param mode: the mode in which to open the file.
-    :param encoding: the encoding to use.
-    :param errors: the error handling for this file.
-    :param lazy: can be flipped to true to open the file lazily.
-    :param atomic: in atomic mode writes go into a temporary file and it's
-                   moved on close.
-    """
-    if lazy:
-        return LazyFile(filename, mode, encoding, errors, atomic=atomic)
-    f, should_close = open_stream(filename, mode, encoding, errors,
-                                  atomic=atomic)
-    if not should_close:
-        f = KeepOpenFile(f)
-    return f
-
-
-def get_os_args():
-    """This returns the argument part of sys.argv in the most appropriate
-    form for processing.  What this means is that this return value is in
-    a format that works for Click to process but does not necessarily
-    correspond well to what's actually standard for the interpreter.
-
-    On most environments the return value is ``sys.argv[:1]`` unchanged.
-    However if you are on Windows and running Python 2 the return value
-    will actually be a list of unicode strings instead because the
-    default behavior on that platform otherwise will not be able to
-    carry all possible values that sys.argv can have.
-
-    .. versionadded:: 6.0
-    """
-    # We can only extract the unicode argv if sys.argv has not been
-    # changed since the startup of the application.
-    if PY2 and WIN and _initial_argv_hash == _hash_py_argv():
-        return _get_windows_argv()
-    return sys.argv[1:]
-
-
-def format_filename(filename, shorten=False):
-    """Formats a filename for user display.  The main purpose of this
-    function is to ensure that the filename can be displayed at all.  This
-    will decode the filename to unicode if necessary in a way that it will
-    not fail.  Optionally, it can shorten the filename to not include the
-    full path to the filename.
-
-    :param filename: formats a filename for UI display.  This will also convert
-                     the filename into unicode without failing.
-    :param shorten: this optionally shortens the filename to strip of the
-                    path that leads up to it.
-    """
-    if shorten:
-        filename = os.path.basename(filename)
-    return filename_to_ui(filename)
-
-
-def get_app_dir(app_name, roaming=True, force_posix=False):
-    r"""Returns the config folder for the application.  The default behavior
-    is to return whatever is most appropriate for the operating system.
-
-    To give you an idea, for an app called ``"Foo Bar"``, something like
-    the following folders could be returned:
-
-    Mac OS X:
-      ``~/Library/Application Support/Foo Bar``
-    Mac OS X (POSIX):
-      ``~/.foo-bar``
-    Unix:
-      ``~/.config/foo-bar``
-    Unix (POSIX):
-      ``~/.foo-bar``
-    Win XP (roaming):
-      ``C:\Documents and Settings\<user>\Local Settings\Application Data\Foo Bar``
-    Win XP (not roaming):
-      ``C:\Documents and Settings\<user>\Application Data\Foo Bar``
-    Win 7 (roaming):
-      ``C:\Users\<user>\AppData\Roaming\Foo Bar``
-    Win 7 (not roaming):
-      ``C:\Users\<user>\AppData\Local\Foo Bar``
-
-    .. versionadded:: 2.0
-
-    :param app_name: the application name.  This should be properly capitalized
-                     and can contain whitespace.
-    :param roaming: controls if the folder should be roaming or not on Windows.
-                    Has no affect otherwise.
-    :param force_posix: if this is set to `True` then on any POSIX system the
-                        folder will be stored in the home folder with a leading
-                        dot instead of the XDG config home or darwin's
-                        application support folder.
-    """
-    if WIN:
-        key = roaming and 'APPDATA' or 'LOCALAPPDATA'
-        folder = os.environ.get(key)
-        if folder is None:
-            folder = os.path.expanduser('~')
-        return os.path.join(folder, app_name)
-    if force_posix:
-        return os.path.join(os.path.expanduser('~/.' + _posixify(app_name)))
-    if sys.platform == 'darwin':
-        return os.path.join(os.path.expanduser(
-            '~/Library/Application Support'), app_name)
-    return os.path.join(
-        os.environ.get('XDG_CONFIG_HOME', os.path.expanduser('~/.config')),
-        _posixify(app_name))
-
-
-class PacifyFlushWrapper(object):
-    """This wrapper is used to catch and suppress BrokenPipeErrors resulting
-    from ``.flush()`` being called on broken pipe during the shutdown/final-GC
-    of the Python interpreter. Notably ``.flush()`` is always called on
-    ``sys.stdout`` and ``sys.stderr``. So as to have minimal impact on any
-    other cleanup code, and the case where the underlying file is not a broken
-    pipe, all calls and attributes are proxied.
-    """
-
-    def __init__(self, wrapped):
-        self.wrapped = wrapped
-
-    def flush(self):
-        try:
-            self.wrapped.flush()
-        except IOError as e:
-            import errno
-            if e.errno != errno.EPIPE:
-                raise
-
-    def __getattr__(self, attr):
-        return getattr(self.wrapped, attr)