"""Listet Python-Codeblöcke mit Einrückungsfehlern in Markdown-Dateien (mit Inhalt, zum Vergleich mit der Quelle).

Aufruf: python tools/qa/pyblocks.py AUSGABE/chapters/*.md
"""

from __future__ import annotations

import ast
import re
import sys


def main() -> None:
    for path in sys.argv[1:]:
        with open(path, encoding="utf-8") as fh:
            lines = fh.read().split("\n")
        i = 0
        while i < len(lines):
            m = re.match(r"^(`{3,})python\s*$", lines[i])
            if m:
                j = i + 1
                while j < len(lines) and not lines[j].startswith(m.group(1)):
                    j += 1
                try:
                    ast.parse("\n".join(lines[i + 1:j]))
                except IndentationError as exc:
                    print(f"== {path}:{i + 1} {exc.msg} (Blockzeile {exc.lineno})")
                    print("\n".join(f"{k + 1:3}|{line}" for k, line in enumerate(lines[i + 1:j])))
                except SyntaxError:
                    pass  # fragments and program output are no indentation defects
                i = j
            i += 1


if __name__ == "__main__":
    main()