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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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