fix_translation.py

from pathlib import Path
import sys
import itertools

source = Path(sys.argv[1])
target = Path(sys.argv[2])
if target.exists():
    print("%s already exists, aborting." % target)
    sys.exit()

for source_file in source.glob("**/*.md"):
    fixed_file = Path(target, source_file)
    fixed_file.parent.mkdir(parents=True, exist_ok=True)
    with source_file.open() as in_, fixed_file.open('w') as out:
        for is_block, lines in itertools.groupby(in_, lambda l: l.startswith('    ')):
            if is_block:
                first_line = next(lines)[4:]
                if first_line.strip() in {'python', 'html', 'css', 'shell'}:
                    out.write("```" + first_line)
                else:
                    out.write("```\n")
                    out.write(first_line)
                out.writelines(l[4:] for l in lines if l.strip())
                out.write("```\n")
            else:
                out.writelines(lines)