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from __future__ import unicode_literals

import logging

import os.path

import sys

from pre_commit.util import cmd_output

logger = logging.getLogger(__name__)

def zsplit(s):

s = s.strip('\0')

if s:

return s.split('\0')

else:

return []

def no_git_env():

# Too many bugs dealing with environment variables and GIT:

# https://github.com/pre-commit/pre-commit/issues/300

# In git 2.6.3 (maybe others), git exports GIT_WORK_TREE while running

# pre-commit hooks

# In git 1.9.1 (maybe others), git exports GIT_DIR and GIT_INDEX_FILE

# while running pre-commit hooks in submodules.

# GIT_DIR: Causes git clone to clone wrong thing

# GIT_INDEX_FILE: Causes 'error invalid object ...' during commit

return {

k: v for k, v in os.environ.items()

if not k.startswith('GIT_') or

k in {'GIT_EXEC_PATH', 'GIT_SSH', 'GIT_SSH_COMMAND'}

}

def get_root():

return cmd_output('git', 'rev-parse', '--show-toplevel')[1].strip()

def get_git_dir(git_root='.'):

opts = ('--git-common-dir', '--git-dir')

_, out, _ = cmd_output('git', 'rev-parse', *opts, cwd=git_root)

for line, opt in zip(out.splitlines(), opts):

if line != opt: # pragma: no branch (git < 2.5)

return os.path.normpath(os.path.join(git_root, line))

else:

raise AssertionError('unreachable: no git dir')

def get_remote_url(git_root):

ret = cmd_output('git', 'config', 'remote.origin.url', cwd=git_root)[1]

return ret.strip()

def is_in_merge_conflict():

git_dir = get_git_dir('.')

return (

os.path.exists(os.path.join(git_dir, 'MERGE_MSG')) and

os.path.exists(os.path.join(git_dir, 'MERGE_HEAD'))

)

def parse_merge_msg_for_conflicts(merge_msg):

# Conflicted files start with tabs

return [

line.lstrip(b'#').strip().decode('UTF-8')

for line in merge_msg.splitlines()

# '#\t' for git 2.4.1

if line.startswith((b'\t', b'#\t'))

]

def get_conflicted_files():

logger.info('Checking merge-conflict files only.')

# Need to get the conflicted files from the MERGE_MSG because they could

# have resolved the conflict by choosing one side or the other

with open(os.path.join(get_git_dir('.'), 'MERGE_MSG'), 'rb') as f:

merge_msg = f.read()

merge_conflict_filenames = parse_merge_msg_for_conflicts(merge_msg)

# This will get the rest of the changes made after the merge.

# If they resolved the merge conflict by choosing a mesh of both sides

# this will also include the conflicted files

tree_hash = cmd_output('git', 'write-tree')[1].strip()

merge_diff_filenames = zsplit(cmd_output(

'git', 'diff', '--name-only', '--no-ext-diff', '-z',

'-m', tree_hash, 'HEAD', 'MERGE_HEAD',

)[1])

return set(merge_conflict_filenames) | set(merge_diff_filenames)

def get_staged_files():

return zsplit(cmd_output(

'git', 'diff', '--staged', '--name-only', '--no-ext-diff', '-z',

# Everything except for D

'--diff-filter=ACMRTUXB',

)[1])

def intent_to_add_files():

_, stdout_binary, _ = cmd_output('git', 'status', '--porcelain', '-z')

parts = list(reversed(zsplit(stdout_binary)))

intent_to_add = []

while parts:

line = parts.pop()

status, filename = line[:3], line[3:]

if status[0] in {'C', 'R'}: # renames / moves have an additional arg

parts.pop()

if status[1] == 'A':

intent_to_add.append(filename)

return intent_to_add

def get_all_files():

return zsplit(cmd_output('git', 'ls-files', '-z')[1])

def get_changed_files(new, old):

return zsplit(cmd_output(

'git', 'diff', '--name-only', '--no-ext-diff', '-z',

'{}...{}'.format(old, new),

)[1])

def head_rev(remote):

_, out, _ = cmd_output('git', 'ls-remote', '--exit-code', remote, 'HEAD')

return out.split()[0]

def has_diff(*args, **kwargs):

repo = kwargs.pop('repo', '.')

assert not kwargs, kwargs

cmd = ('git', 'diff', '--quiet', '--no-ext-diff') + args

return cmd_output(*cmd, cwd=repo, retcode=None)[0]

def commit(repo='.'):

env = no_git_env()

name, email = 'pre-commit', 'asottile+pre-commit@umich.edu'

env['GIT_AUTHOR_NAME'] = env['GIT_COMMITTER_NAME'] = name

env['GIT_AUTHOR_EMAIL'] = env['GIT_COMMITTER_EMAIL'] = email

cmd = ('git', 'commit', '--no-edit', '--no-gpg-sign', '-n', '-minit')

cmd_output(*cmd, cwd=repo, env=env)

def git_path(name, repo='.'):

_, out, _ = cmd_output('git', 'rev-parse', '--git-path', name, cwd=repo)

return os.path.join(repo, out.strip())

def check_for_cygwin_mismatch():

"""See https://github.com/pre-commit/pre-commit/issues/354"""

if sys.platform in ('cygwin', 'win32'): # pragma: no cover (windows)

is_cygwin_python = sys.platform == 'cygwin'

toplevel = cmd_output('git', 'rev-parse', '--show-toplevel')[1]

is_cygwin_git = toplevel.startswith('/')

if is_cygwin_python ^ is_cygwin_git:

exe_type = {True: '(cygwin)', False: '(windows)'}

logger.warn(

'pre-commit has detected a mix of cygwin python / git\n'

'This combination is not supported, it is likely you will '

'receive an error later in the program.\n'

'Make sure to use cygwin git+python while using cygwin\n'

'These can be installed through the cygwin installer.\n'

' - python {}\n'

' - git {}\n'.format(

exe_type[is_cygwin_python], exe_type[is_cygwin_git],

)

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