devscripts/make_readme.py

   1 #!/usr/bin/env python3
   2
   3 """
   4 yt-dlp --help | make_readme.py
   5 This must be run in a console of correct width
   6 """
   7
   8 # Allow direct execution
   9 import os
  10 import sys
  11
  12 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
  13
  14
  15 import functools
  16 import re
  17
  18 from devscripts.utils import read_file, write_file
  19
  20 README_FILE = 'README.md'
  21
  22 OPTIONS_START = 'General Options:'
  23 OPTIONS_END = 'CONFIGURATION'
  24 EPILOG_START = 'See full documentation'
  25 ALLOWED_OVERSHOOT = 2
  26
  27 DISABLE_PATCH = object()
  28
  29
  30 def take_section(text, start=None, end=None, *, shift=0):
  31     return text[
  32         text.index(start) + shift if start else None:
  33         text.index(end) + shift if end else None
  34     ]
  35
  36
  37 def apply_patch(text, patch):
  38     return text if patch[0] is DISABLE_PATCH else re.sub(*patch, text)
  39
  40
  41 options = take_section(sys.stdin.read(), f'\n  {OPTIONS_START}', f'\n{EPILOG_START}', shift=1)
  42
  43 max_width = max(map(len, options.split('\n')))
  44 switch_col_width = len(re.search(r'(?m)^\s{5,}', options).group())
  45 delim = f'\n{" " * switch_col_width}'
  46
  47 PATCHES = (
  48     (   # Standardize update message
  49         r'(?m)^(    -U, --update\s+).+(\n    \s.+)*$',
  50         r'\1Update this program to the latest version',
  51     ),
  52     (  # Headings
  53         r'(?m)^  (\w.+\n)(    (?=\w))?',
  54         r'## \1'
  55     ),
  56     (  # Do not split URLs
  57         rf'({delim[:-1]})? (?P<label>\[\S+\] )?(?P<url>https?({delim})?:({delim})?/({delim})?/(({delim})?\S+)+)\s',
  58         lambda mobj: ''.join((delim, mobj.group('label') or '', re.sub(r'\s+', '', mobj.group('url')), '\n'))
  59     ),
  60     (  # Do not split "words"
  61         rf'(?m)({delim}\S+)+$',
  62         lambda mobj: ''.join((delim, mobj.group(0).replace(delim, '')))
  63     ),
  64     (  # Allow overshooting last line
  65         rf'(?m)^(?P<prev>.+)${delim}(?P<current>.+)$(?!{delim})',
  66         lambda mobj: (mobj.group().replace(delim, ' ')
  67                       if len(mobj.group()) - len(delim) + 1 <= max_width + ALLOWED_OVERSHOOT
  68                       else mobj.group())
  69     ),
  70     (  # Avoid newline when a space is available b/w switch and description
  71         DISABLE_PATCH,  # This creates issues with prepare_manpage
  72         r'(?m)^(\s{4}-.{%d})(%s)' % (switch_col_width - 6, delim),
  73         r'\1 '
  74     ),
  75 )
  76
  77 readme = read_file(README_FILE)
  78
  79 write_file(README_FILE, ''.join((
  80     take_section(readme, end=f'## {OPTIONS_START}'),
  81     functools.reduce(apply_patch, PATCHES, options),
  82     take_section(readme, f'# {OPTIONS_END}'),
  83 )))