1 files changed, 97 insertions, 0 deletions
diff --git a/devscripts/prepare_manpage.py b/devscripts/prepare_manpage.py
new file mode 100644
index 0000000..9b12e71
--- /dev/null
+++ b/devscripts/prepare_manpage.py
@@ -0,0 +1,97 @@
+#!/usr/bin/env python3
+
+# Allow direct execution
+import os
+import sys
+
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+
+import os.path
+import re
+
+from devscripts.utils import (
+    compose_functions,
+    get_filename_args,
+    read_file,
+    write_file,
+)
+
+ROOT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+README_FILE = os.path.join(ROOT_DIR, 'README.md')
+
+PREFIX = r'''%yt-dlp(1)
+
+# NAME
+
+yt\-dlp \- A youtube-dl fork with additional features and patches
+
+# SYNOPSIS
+
+**yt-dlp** \[OPTIONS\] URL [URL...]
+
+# DESCRIPTION
+
+'''
+
+
+def filter_excluded_sections(readme):
+    EXCLUDED_SECTION_BEGIN_STRING = re.escape('<!-- MANPAGE: BEGIN EXCLUDED SECTION -->')
+    EXCLUDED_SECTION_END_STRING = re.escape('<!-- MANPAGE: END EXCLUDED SECTION -->')
+    return re.sub(
+        rf'(?s){EXCLUDED_SECTION_BEGIN_STRING}.+?{EXCLUDED_SECTION_END_STRING}\n',
+        '', readme)
+
+
+def move_sections(readme):
+    MOVE_TAG_TEMPLATE = '<!-- MANPAGE: MOVE "%s" SECTION HERE -->'
+    sections = re.findall(r'(?m)^%s$' % (
+        re.escape(MOVE_TAG_TEMPLATE).replace(r'\%', '%') % '(.+)'), readme)
+
+    for section_name in sections:
+        move_tag = MOVE_TAG_TEMPLATE % section_name
+        if readme.count(move_tag) > 1:
+            raise Exception(f'There is more than one occurrence of "{move_tag}". This is unexpected')
+
+        sections = re.findall(rf'(?sm)(^# {re.escape(section_name)}.+?)(?=^# )', readme)
+        if len(sections) < 1:
+            raise Exception(f'The section {section_name} does not exist')
+        elif len(sections) > 1:
+            raise Exception(f'There are multiple occurrences of section {section_name}, this is unhandled')
+
+        readme = readme.replace(sections[0], '', 1).replace(move_tag, sections[0], 1)
+    return readme
+
+
+def filter_options(readme):
+    section = re.search(r'(?sm)^# USAGE AND OPTIONS\n.+?(?=^# )', readme).group(0)
+    options = '# OPTIONS\n'
+    for line in section.split('\n')[1:]:
+        mobj = re.fullmatch(r'''(?x)
+                \s{4}(?P<opt>-(?:,\s|[^\s])+)
+                (?:\s(?P<meta>(?:[^\s]|\s(?!\s))+))?
+                (\s{2,}(?P<desc>.+))?
+            ''', line)
+        if not mobj:
+            options += f'{line.lstrip()}\n'
+            continue
+        option, metavar, description = mobj.group('opt', 'meta', 'desc')
+
+        # Pandoc's definition_lists. See http://pandoc.org/README.html
+        option = f'{option} *{metavar}*' if metavar else option
+        description = f'{description}\n' if description else ''
+        options += f'\n{option}\n:   {description}'
+        continue
+
+    return readme.replace(section, options, 1)
+
+
+TRANSFORM = compose_functions(filter_excluded_sections, move_sections, filter_options)
+
+
+def main():
+    write_file(get_filename_args(), PREFIX + TRANSFORM(read_file(README_FILE)))
+
+
+if __name__ == '__main__':
+    main()