import re import textwrap import yaml from pre_commit.util import yaml_load def _is_header_line(line: str) -> bool: return line.startswith(('#', '---')) or not line.strip() def _migrate_map(contents: str) -> str: if isinstance(yaml_load(contents), list): # Find the first non-header line lines = contents.splitlines(True) i = 0 # Only loop on non empty configuration file while i < len(lines) and _is_header_line(lines[i]): i += 1 header = ''.join(lines[:i]) rest = ''.join(lines[i:]) # If they are using the "default" flow style of yaml, this operation # will yield a valid configuration try: trial_contents = f'{header}repos:\n{rest}' yaml_load(trial_contents) contents = trial_contents except yaml.YAMLError: contents = f'{header}repos:\n{textwrap.indent(rest, " " * 4)}' return contents def _migrate_sha_to_rev(contents: str) -> str: return re.sub(r'(\n\s+)sha:', r'\1rev:', contents) def migrate_config(config_file: str, quiet: bool = False) -> int: with open(config_file) as f: orig_contents = contents = f.read() contents = _migrate_map(contents) contents = _migrate_sha_to_rev(contents) if contents != orig_contents: with open(config_file, 'w') as f: f.write(contents) print('Configuration has been migrated.') elif not quiet: print('Configuration is already migrated.') return 0