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from __future__ import print_function

from __future__ import unicode_literals

import logging

import os

import sys

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 noop_context

logger = logging.getLogger('pre_commit')

def _get_skips(environ):

skips = environ.get('SKIP', '')

return set(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', '--name-only', '{}...{}'.format(old, new),

)[1].splitlines()

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'])

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', retcode=None, encoding=None)

retcode, stdout, stderr = repo.run_hook(hook, tuple(filenames))

diff_after = cmd_output('git', '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())

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)

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', '--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

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)

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