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from __future__ import annotations
import functools
import itertools
import textwrap
from collections.abc import Callable
import cfgv
import yaml
from yaml.nodes import ScalarNode
from pre_commit.clientlib import InvalidConfigError
from pre_commit.yaml import yaml_compose
from pre_commit.yaml import yaml_load
from pre_commit.yaml_rewrite import MappingKey
from pre_commit.yaml_rewrite import MappingValue
from pre_commit.yaml_rewrite import match
from pre_commit.yaml_rewrite import SequenceItem
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 _preserve_style(n: ScalarNode, *, s: str) -> str:
style = n.style or ''
return f'{style}{s}{style}'
def _fix_stage(n: ScalarNode) -> str:
return _preserve_style(n, s=f'pre-{n.value}')
def _migrate_composed(contents: str) -> str:
tree = yaml_compose(contents)
rewrites: list[tuple[ScalarNode, Callable[[ScalarNode], str]]] = []
# sha -> rev
sha_to_rev_replace = functools.partial(_preserve_style, s='rev')
sha_to_rev_matcher = (
MappingValue('repos'),
SequenceItem(),
MappingKey('sha'),
)
for node in match(tree, sha_to_rev_matcher):
rewrites.append((node, sha_to_rev_replace))
# python_venv -> python
language_matcher = (
MappingValue('repos'),
SequenceItem(),
MappingValue('hooks'),
SequenceItem(),
MappingValue('language'),
)
python_venv_replace = functools.partial(_preserve_style, s='python')
for node in match(tree, language_matcher):
if node.value == 'python_venv':
rewrites.append((node, python_venv_replace))
# stages rewrites
default_stages_matcher = (MappingValue('default_stages'), SequenceItem())
default_stages_match = match(tree, default_stages_matcher)
hook_stages_matcher = (
MappingValue('repos'),
SequenceItem(),
MappingValue('hooks'),
SequenceItem(),
MappingValue('stages'),
SequenceItem(),
)
hook_stages_match = match(tree, hook_stages_matcher)
for node in itertools.chain(default_stages_match, hook_stages_match):
if node.value in {'commit', 'push', 'merge-commit'}:
rewrites.append((node, _fix_stage))
rewrites.sort(reverse=True, key=lambda nf: nf[0].start_mark.index)
src_parts = []
end: int | None = None
for node, func in rewrites:
src_parts.append(contents[node.end_mark.index:end])
src_parts.append(func(node))
end = node.start_mark.index
src_parts.append(contents[:end])
src_parts.reverse()
return ''.join(src_parts)
def migrate_config(config_file: str, quiet: bool = False) -> int:
with open(config_file) as f:
orig_contents = contents = f.read()
with cfgv.reraise_as(InvalidConfigError):
with cfgv.validate_context(f'File {config_file}'):
try:
yaml_load(orig_contents)
except Exception as e:
raise cfgv.ValidationError(str(e))
contents = _migrate_map(contents)
contents = _migrate_composed(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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