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import functools
from threading import Lock
from .utils import supports_terminal_sequences, TERMINAL_SEQUENCES, write_string
class MultilinePrinterBase:
def __init__(self, stream=None, lines=1):
self.stream = stream
self.maximum = lines - 1
def __enter__(self):
return self
def __exit__(self, *args):
self.end()
def print_at_line(self, text, pos):
pass
def end(self):
pass
def _add_line_number(self, text, line):
if self.maximum:
return f'{line + 1}: {text}'
return text
def write(self, *text):
write_string(''.join(text), self.stream)
class QuietMultilinePrinter(MultilinePrinterBase):
pass
class MultilineLogger(MultilinePrinterBase):
def write(self, *text):
self.stream.debug(''.join(text))
def print_at_line(self, text, pos):
# stream is the logger object, not an actual stream
self.write(self._add_line_number(text, pos))
class BreaklineStatusPrinter(MultilinePrinterBase):
def print_at_line(self, text, pos):
self.write(self._add_line_number(text, pos), '\n')
class MultilinePrinter(MultilinePrinterBase):
def __init__(self, stream=None, lines=1, preserve_output=True):
super().__init__(stream, lines)
self.preserve_output = preserve_output
self._lastline = self._lastlength = 0
self._movelock = Lock()
self._HAVE_FULLCAP = supports_terminal_sequences(self.stream)
def lock(func):
@functools.wraps(func)
def wrapper(self, *args, **kwargs):
with self._movelock:
return func(self, *args, **kwargs)
return wrapper
def _move_cursor(self, dest):
current = min(self._lastline, self.maximum)
yield '\r'
distance = dest - current
if distance < 0:
yield TERMINAL_SEQUENCES['UP'] * -distance
elif distance > 0:
yield TERMINAL_SEQUENCES['DOWN'] * distance
self._lastline = dest
@lock
def print_at_line(self, text, pos):
if self._HAVE_FULLCAP:
self.write(*self._move_cursor(pos), TERMINAL_SEQUENCES['ERASE_LINE'], text)
text = self._add_line_number(text, pos)
textlen = len(text)
if self._lastline == pos:
# move cursor at the start of progress when writing to same line
prefix = '\r'
if self._lastlength > textlen:
text += ' ' * (self._lastlength - textlen)
self._lastlength = textlen
else:
# otherwise, break the line
prefix = '\n'
self._lastlength = textlen
self.write(prefix, text)
self._lastline = pos
@lock
def end(self):
# move cursor to the end of the last line, and write line break
# so that other to_screen calls can precede
text = self._move_cursor(self.maximum) if self._HAVE_FULLCAP else []
if self.preserve_output:
self.write(*text, '\n')
return
if self._HAVE_FULLCAP:
self.write(
*text, TERMINAL_SEQUENCES['ERASE_LINE'],
f'{TERMINAL_SEQUENCES["UP"]}{TERMINAL_SEQUENCES["ERASE_LINE"]}' * self.maximum)
else:
self.write(*text, ' ' * self._lastlength)
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