"""
Change every module page in the CPython docs 
so that the title doesn't link to itself.
"""

from pathlib import Path

# Edge cases:
# - modules with a blank line at the top.
# - modules that already had the !-prefix to suppress the link.
# - had to fix the rule length
# - pages that started with a link, but to the main module page.
#       unittest.mock-examples.rst
# - pages with slightly off names:
#       xml.sax.xmlreader is in xml.sax.reader.rst
#       xml.etree.ElementTree is in xml.etree.elementtree.rst
#       xml.parsers.expat is in pyexpat.rst
#       xml.sax.saxutils is in xml.sax.utils.rst
# - pages with two links in the title!
#       copyreg.rst

def fix_one_file(fpath):
    text = fpath.read_text().lstrip()
    if not text.startswith(":mod:`"):
        return
    if text.startswith(":mod:`!"):
        return
    lines = text.splitlines(keepends=True)
    modname = lines[0].split("`")[1]
    if modname != fpath.stem:
        print(f"WUT: {modname=}, {fpath.stem=}")
    lines[0] = lines[0].replace(":mod:`", ":mod:`!")
    lines[1] = lines[1][0] * (len(lines[0]) - 1) + "\n"
    fpath.write_text("".join(lines))
    print(f"Updated {fpath}")

for fname in Path(".").glob("**/*.rst"):
    fix_one_file(fname)