1 files changed, 56 insertions, 12 deletions
diff --git a/devscripts/make_readme.py b/devscripts/make_readme.py
index fd234bf58..f2e08d7c6 100644
--- a/devscripts/make_readme.py
+++ b/devscripts/make_readme.py
@@ -1,7 +1,12 @@
 #!/usr/bin/env python3
 
-# yt-dlp --help | make_readme.py
-# This must be run in a console of correct width
+"""
+yt-dlp --help | make_readme.py
+This must be run in a console of correct width
+"""
+
+
+import functools
 import re
 import sys
 
@@ -10,21 +15,60 @@ README_FILE = 'README.md'
 OPTIONS_START = 'General Options:'
 OPTIONS_END = 'CONFIGURATION'
 EPILOG_START = 'See full documentation'
+ALLOWED_OVERSHOOT = 2
+
+DISABLE_PATCH = object()
+
+
+def take_section(text, start=None, end=None, *, shift=0):
+    return text[
+        text.index(start) + shift if start else None:
+        text.index(end) + shift if end else None
+    ]
 
 
-helptext = sys.stdin.read()
-if isinstance(helptext, bytes):
-    helptext = helptext.decode()
+def apply_patch(text, patch):
+    return text if patch[0] is DISABLE_PATCH else re.sub(*patch, text)
 
-start, end = helptext.index(f'\n  {OPTIONS_START}'), helptext.index(f'\n{EPILOG_START}')
-options = re.sub(r'(?m)^  (\w.+)$', r'## \1', helptext[start + 1: end + 1])
+
+options = take_section(sys.stdin.read(), f'\n  {OPTIONS_START}', f'\n{EPILOG_START}', shift=1)
+
+max_width = max(map(len, options.split('\n')))
+switch_col_width = len(re.search(r'(?m)^\s{5,}', options).group())
+delim = f'\n{" " * switch_col_width}'
+
+PATCHES = (
+    (  # Headings
+        r'(?m)^  (\w.+\n)(    (?=\w))?',
+        r'## \1'
+    ),
+    (  # Do not split URLs
+        rf'({delim[:-1]})? (?P<label>\[\S+\] )?(?P<url>https?({delim})?:({delim})?/({delim})?/(({delim})?\S+)+)\s',
+        lambda mobj: ''.join((delim, mobj.group('label') or '', re.sub(r'\s+', '', mobj.group('url')), '\n'))
+    ),
+    (  # Do not split "words"
+        rf'(?m)({delim}\S+)+$',
+        lambda mobj: ''.join((delim, mobj.group(0).replace(delim, '')))
+    ),
+    (  # Allow overshooting last line
+        rf'(?m)^(?P<prev>.+)${delim}(?P<current>.+)$(?!{delim})',
+        lambda mobj: (mobj.group().replace(delim, ' ')
+                      if len(mobj.group()) - len(delim) + 1 <= max_width + ALLOWED_OVERSHOOT
+                      else mobj.group())
+    ),
+    (  # Avoid newline when a space is available b/w switch and description
+        DISABLE_PATCH,  # This creates issues with prepare_manpage
+        r'(?m)^(\s{4}-.{%d})(%s)' % (switch_col_width - 6, delim),
+        r'\1 '
+    ),
+)
 
 with open(README_FILE, encoding='utf-8') as f:
     readme = f.read()
 
-header = readme[:readme.index(f'## {OPTIONS_START}')]
-footer = readme[readme.index(f'# {OPTIONS_END}'):]
-
 with open(README_FILE, 'w', encoding='utf-8') as f:
-    for part in (header, options, footer):
-        f.write(part)
+    f.write(''.join((
+        take_section(readme, end=f'## {OPTIONS_START}'),
+        functools.reduce(apply_patch, PATCHES, options),
+        take_section(readme, f'# {OPTIONS_END}'),
+    )))