yt-dlc/devscripts/make_readme.py

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import sys
import re
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README_FILE = 'README.md'
helptext = sys.stdin.read()
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with open(README_FILE) as f:
oldreadme = f.read()
header = oldreadme[:oldreadme.index('# OPTIONS')]
footer = oldreadme[oldreadme.index('# CONFIGURATION'):]
options = helptext[helptext.index(' General Options:')+19:]
options = re.sub(r'^ (\w.+)$', r'## \1', options, flags=re.M)
options = '# OPTIONS\n' + options + '\n'
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with open(README_FILE, 'w') as f:
f.write(header)
f.write(options)
f.write(footer)