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run.py
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run.py
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from __future__ import print_function
from __future__ import unicode_literals
import logging
import os
import subprocess
import sys
from identify.identify import tags_from_path
from pre_commit import color
from pre_commit import git
from pre_commit import output
from pre_commit.output import get_hook_message
from pre_commit.staged_files_only import staged_files_only
from pre_commit.util import cmd_output
from pre_commit.util import memoize_by_cwd
from pre_commit.util import noop_context
logger = logging.getLogger('pre_commit')
tags_from_path = memoize_by_cwd(tags_from_path)
def _get_skips(environ):
skips = environ.get('SKIP', '')
return {skip.strip() for skip in skips.split(',') if skip.strip()}
def _hook_msg_start(hook, verbose):
return '{}{}'.format(
'[{}] '.format(hook['id']) if verbose else '',
hook['name'],
)
def get_changed_files(new, old):
return cmd_output(
'git', 'diff', '--no-ext-diff', '--name-only',
'{}...{}'.format(old, new),
)[1].splitlines()
def filter_filenames_by_types(filenames, types):
types = frozenset(types)
return tuple(
filename for filename in filenames
if tags_from_path(filename) >= types
)
def get_filenames(args, include_expr, exclude_expr):
if args.origin and args.source:
getter = git.get_files_matching(
lambda: get_changed_files(args.origin, args.source),
)
elif args.files:
getter = git.get_files_matching(lambda: args.files)
elif args.all_files:
getter = git.get_all_files_matching
elif git.is_in_merge_conflict():
getter = git.get_conflicted_files_matching
else:
getter = git.get_staged_files_matching
return getter(include_expr, exclude_expr)
SKIPPED = 'Skipped'
NO_FILES = '(no files to check)'
def _run_single_hook(hook, repo, args, skips, cols):
filenames = get_filenames(args, hook['files'], hook['exclude'])
filenames = filter_filenames_by_types(filenames, hook['types'])
if hook['id'] in skips:
output.write(get_hook_message(
_hook_msg_start(hook, args.verbose),
end_msg=SKIPPED,
end_color=color.YELLOW,
use_color=args.color,
cols=cols,
))
return 0
elif not filenames and not hook['always_run']:
output.write(get_hook_message(
_hook_msg_start(hook, args.verbose),
postfix=NO_FILES,
end_msg=SKIPPED,
end_color=color.TURQUOISE,
use_color=args.color,
cols=cols,
))
return 0
# Print the hook and the dots first in case the hook takes hella long to
# run.
output.write(get_hook_message(
_hook_msg_start(hook, args.verbose), end_len=6, cols=cols,
))
sys.stdout.flush()
diff_before = cmd_output(
'git', 'diff', '--no-ext-diff', retcode=None, encoding=None,
)
retcode, stdout, stderr = repo.run_hook(
hook,
tuple(filenames) if hook['pass_filenames'] else (),
)
diff_after = cmd_output(
'git', 'diff', '--no-ext-diff', retcode=None, encoding=None,
)
file_modifications = diff_before != diff_after
# If the hook makes changes, fail the commit
if file_modifications:
retcode = 1
if retcode:
retcode = 1
print_color = color.RED
pass_fail = 'Failed'
else:
retcode = 0
print_color = color.GREEN
pass_fail = 'Passed'
output.write_line(color.format_color(pass_fail, print_color, args.color))
if (stdout or stderr or file_modifications) and (retcode or args.verbose):
output.write_line('hookid: {}\n'.format(hook['id']))
# Print a message if failing due to file modifications
if file_modifications:
output.write('Files were modified by this hook.')
if stdout or stderr:
output.write_line(' Additional output:')
output.write_line()
for out in (stdout, stderr):
assert type(out) is bytes, type(out)
if out.strip():
output.write_line(out.strip(), logfile_name=hook['log_file'])
output.write_line()
return retcode
def _compute_cols(hooks, verbose):
"""Compute the number of columns to display hook messages. The widest
that will be displayed is in the no files skipped case:
Hook name...(no files to check) Skipped
or in the verbose case
Hook name [hookid]...(no files to check) Skipped
"""
if hooks:
name_len = max(len(_hook_msg_start(hook, verbose)) for hook in hooks)
else:
name_len = 0
cols = name_len + 3 + len(NO_FILES) + 1 + len(SKIPPED)
return max(cols, 80)
def _run_hooks(repo_hooks, args, environ):
"""Actually run the hooks."""
skips = _get_skips(environ)
cols = _compute_cols([hook for _, hook in repo_hooks], args.verbose)
retval = 0
for repo, hook in repo_hooks:
retval |= _run_single_hook(hook, repo, args, skips, cols)
if (
retval and
args.show_diff_on_failure and
subprocess.call(('git', 'diff', '--quiet', '--no-ext-diff')) != 0
):
print('All changes made by hooks:')
subprocess.call(('git', 'diff', '--no-ext-diff'))
return retval
def get_repo_hooks(runner):
for repo in runner.repositories:
for _, hook in repo.hooks:
yield (repo, hook)
def _has_unmerged_paths(runner):
_, stdout, _ = runner.cmd_runner.run(['git', 'ls-files', '--unmerged'])
return bool(stdout.strip())
def _has_unstaged_config(runner):
retcode, _, _ = runner.cmd_runner.run(
(
'git', 'diff', '--no-ext-diff', '--exit-code',
runner.config_file_path,
),
retcode=None,
)
# be explicit, other git errors don't mean it has an unstaged config.
return retcode == 1
def run(runner, args, environ=os.environ):
no_stash = args.no_stash or args.all_files or bool(args.files)
# Check if we have unresolved merge conflict files and fail fast.
if _has_unmerged_paths(runner):
logger.error('Unmerged files. Resolve before committing.')
return 1
if bool(args.source) != bool(args.origin):
logger.error('Specify both --origin and --source.')
return 1
if _has_unstaged_config(runner) and not no_stash:
if args.allow_unstaged_config:
logger.warn(
'You have an unstaged config file and have specified the '
'--allow-unstaged-config option.\n'
'Note that your config will be stashed before the config is '
'parsed unless --no-stash is specified.',
)
else:
logger.error(
'Your .pre-commit-config.yaml is unstaged.\n'
'`git add .pre-commit-config.yaml` to fix this.\n'
'Run pre-commit with --allow-unstaged-config to silence this.'
)
return 1
# Expose origin / source as environment variables for hooks to consume
if args.origin and args.source:
environ['PRE_COMMIT_ORIGIN'] = args.origin
environ['PRE_COMMIT_SOURCE'] = args.source
if no_stash:
ctx = noop_context()
else:
ctx = staged_files_only(runner.cmd_runner)
with ctx:
repo_hooks = list(get_repo_hooks(runner))
if args.hook:
repo_hooks = [
(repo, hook) for repo, hook in repo_hooks
if hook['id'] == args.hook
]
if not repo_hooks:
output.write_line('No hook with id `{}`'.format(args.hook))
return 1
# Filter hooks for stages
repo_hooks = [
(repo, hook) for repo, hook in repo_hooks
if not hook['stages'] or args.hook_stage in hook['stages']
]
return _run_hooks(repo_hooks, args, environ)