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_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],
                ),
            )

pre_commit/git.py
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],
                ),
            )

pre_commit/git.py
diff --git a/pre_commit/git.py b/pre_commit/git.py
index 4849d7c64..06c847f36 100644
--- a/pre_commit/git.py
+++ b/pre_commit/git.py
@@ -29,7 +29,8 @@ def no_git_env():
     # 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_SSH', 'GIT_SSH_COMMAND'}
+        if not k.startswith('GIT_') or
+        k in {'GIT_EXEC_PATH', 'GIT_SSH', 'GIT_SSH_COMMAND'}
     }
 
 

Not working from SmartGit
I know that this issue may not be caused by `pre-commit` directly, but figured out you guys could help me. Trying to commit directly from `SmartGit` prints this:

```
~/Development/ProjectName> git add --force -- Libraries/IOUtilities/NSString+IOUtilities.m
~/Development/ProjectName> git commit --file=/var/folders/yj/l8y5kytd4tggcv7grrnpznh80000gn/T/smartgit-2497340677383657620tmp/commit-4165014595931887528.tmp -o -- Libraries/IOUtilities/NSString+IOUtilities.m
[INFO] Initializing environment for https://github.com/pre-commit/pre-commit-hooks.
An unexpected error has occurred: CalledProcessError: Command: ('/Applications/SmartGit.app/Contents/Resources/git/libexec/git-core/git', 'submodule', 'update', '--init', '--recursive')
Return code: 1
Expected return code: 0
Output: (none)
Errors: 
    /Applications/SmartGit.app/Contents/Resources/git/libexec/git-core/git-sh-setup: line 46: /usr/local/git/libexec/git-core/git-sh-i18n: No such file or directory
    
Check the log at /Users/revolt/.cache/pre-commit/pre-commit.log
```

and `cat /Users/revolt/.cache/pre-commit/pre-commit.log`:

```
An unexpected error has occurred: CalledProcessError: Command: ('/Applications/SmartGit.app/Contents/Resources/git/libexec/git-core/git', 'submodule', 'update', '--init', '--recursive')
Return code: 1
Expected return code: 0
Output: (none)
Errors: 
    /Applications/SmartGit.app/Contents/Resources/git/libexec/git-core/git-sh-setup: line 46: /usr/local/git/libexec/git-core/git-sh-i18n: No such file or directory
    

Traceback (most recent call last):
  File "/usr/local/Cellar/pre-commit/1.4.1/libexec/lib/python3.6/site-packages/pre_commit/error_handler.py", line 47, in error_handler
    yield
  File "/usr/local/Cellar/pre-commit/1.4.1/libexec/lib/python3.6/site-packages/pre_commit/main.py", line 259, in main
    return run(runner, args)
  File "/usr/local/Cellar/pre-commit/1.4.1/libexec/lib/python3.6/site-packages/pre_commit/commands/run.py", line 244, in run
    for _, hook in repo.hooks:
  File "/usr/local/Cellar/pre-commit/1.4.1/libexec/lib/python3.6/site-packages/cached_property.py", line 26, in __get__
    value = obj.__dict__[self.func.__name__] = self.func(obj)
  File "/usr/local/Cellar/pre-commit/1.4.1/libexec/lib/python3.6/site-packages/pre_commit/repository.py", line 173, in hooks
    if hook['id'] not in self.manifest_hooks:
  File "/usr/local/Cellar/pre-commit/1.4.1/libexec/lib/python3.6/site-packages/cached_property.py", line 26, in __get__
    value = obj.__dict__[self.func.__name__] = self.func(obj)
  File "/usr/local/Cellar/pre-commit/1.4.1/libexec/lib/python3.6/site-packages/pre_commit/repository.py", line 167, in manifest_hooks
    manifest_path = os.path.join(self._repo_path, C.MANIFEST_FILE)
  File "/usr/local/Cellar/pre-commit/1.4.1/libexec/lib/python3.6/site-packages/cached_property.py", line 26, in __get__
    value = obj.__dict__[self.func.__name__] = self.func(obj)
  File "/usr/local/Cellar/pre-commit/1.4.1/libexec/lib/python3.6/site-packages/pre_commit/repository.py", line 155, in _repo_path
    self.repo_config['repo'], self.repo_config['sha'],
  File "/usr/local/Cellar/pre-commit/1.4.1/libexec/lib/python3.6/site-packages/pre_commit/store.py", line 154, in clone
    return self._new_repo(repo, ref, clone_strategy)
  File "/usr/local/Cellar/pre-commit/1.4.1/libexec/lib/python3.6/site-packages/pre_commit/store.py", line 130, in _new_repo
    make_strategy(directory)
  File "/usr/local/Cellar/pre-commit/1.4.1/libexec/lib/python3.6/site-packages/pre_commit/store.py", line 151, in clone_strategy
    env=no_git_env(),
  File "/usr/local/Cellar/pre-commit/1.4.1/libexec/lib/python3.6/site-packages/pre_commit/util.py", line 187, in cmd_output
    returncode, cmd, retcode, output=(stdout, stderr),
pre_commit.util.CalledProcessError: Command: ('/Applications/SmartGit.app/Contents/Resources/git/libexec/git-core/git', 'submodule', 'update', '--init', '--recursive')
Return code: 1
Expected return code: 0
Output: (none)
Errors: 
    /Applications/SmartGit.app/Contents/Resources/git/libexec/git-core/git-sh-setup: line 46: /usr/local/git/libexec/git-core/git-sh-i18n: No such file or directory
```

