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# Copyright (C) 2013 Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# =*= License: GPL-2 =*=
import collections
STATUS_UNTRACKED = '??'
STATUS_IGNORED = '!!'
class GitIndex(object):
'''An object that represents operations on the working tree.
Index objects can be constructed with a different path to the
index file, which can be used to construct commits without
altering the working tree, index or HEAD.
The file must either be a previously initialised index, or a
non-existant file.
Git creates a lock file and atomically alters the index by
renaming a temporary file into place, so `index_file` must be
in a writable directory.
'''
def __init__(self, gd, index_file):
self._gd = gd
self._index_file = index_file
def _run_git(self, *args, **kwargs):
if self._index_file is not None:
kwargs['env'] = kwargs.get('env', {})
kwargs['env']['GIT_INDEX_FILE'] = self._index_file
return self._gd._runcmd(['git'] + list(args), **kwargs)
def _get_status(self):
'''Return git status output in a Python useful format
This runs git status such that unusual filenames are preserved
and returns its output in a sequence of (status_code, to_path,
from_path).
from_path is None unless the status_code says there was a
rename, in which case it is the path it was renamed from.
Untracked and ignored changes are also included in the output,
their status codes are '??' and '!!' respectively.
'''
# git status -z will NUL terminate paths, so we don't have to
# unescape the paths it outputs. Unfortunately each status entry
# can have 1 or 2 paths, so extra parsing is required.
# To handle this, we split it into NUL delimited tokens.
# The first token of an entry is the 2 character status code,
# a space, then the path.
# If our status code starts with R then it's a rename, hence
# has a second path, requiring us to pop an extra token.
status = self._run_git('status', '-z', '--ignored')
tokens = collections.deque(status.split('\0'))
while True:
tok = tokens.popleft()
# Status output is NUL terminated rather than delimited,
# and split is for delimited output. A side effect of this is
# that we get an empty token as the last output. This suits
# us fine, as it gives us a sentinel value to terminate with.
if not tok:
return
# The first token of an entry is 2 character status, a space,
# then the path
code = tok[:2]
to_path = tok[3:]
# If the code starts with R then it's a rename, and
# the next token says where the file was renamed from
from_path = tokens.popleft() if code[0] == 'R' else None
yield code, to_path, from_path
def get_uncommitted_changes(self):
for code, to_path, from_path in self._get_status():
if code not in (STATUS_UNTRACKED, STATUS_IGNORED):
yield code, to_path, from_path
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