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import re

import yaml

from pre_commit.clientlib import load_config

from pre_commit.util import yaml_load

def _indent(s: str) -> str:

lines = s.splitlines(True)

return ''.join(' ' * 4 + line if line.strip() else line for line in lines)

def _is_header_line(line: str) -> bool:

return line.startswith(('#', '---')) or not line.strip()

def _migrate_map(contents: str) -> str:

# 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 isinstance(yaml_load(contents), list):

# 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{_indent(rest)}'

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:

# ensure that the configuration is a valid pre-commit configuration

load_config(config_file)

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

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