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from symbolic import SymbolicReference

from git.exc import GitCommandError

__all__ = ["HEAD"]

class HEAD(SymbolicReference):

"""Provides additional functionality using the git command"""

__slots__ = tuple()

_HEAD_NAME = 'HEAD'

_ORIG_HEAD_NAME = 'ORIG_HEAD'

__slots__ = tuple()

def __init__(self, repo, path=_HEAD_NAME):

if path != self._HEAD_NAME:

raise ValueError("HEAD instance must point to %r, got %r" % (self._HEAD_NAME, path))

super(HEAD, self).__init__(repo, path)

def orig_head(self):

"""

:return: SymbolicReference pointing at the ORIG_HEAD, which is maintained

to contain the previous value of HEAD"""

return SymbolicReference(self.repo, self._ORIG_HEAD_NAME)

def reset(self, commit='HEAD', index=True, working_tree=False,

paths=None, **kwargs):

"""Reset our HEAD to the given commit optionally synchronizing

the index and working tree. The reference we refer to will be set to

commit as well.

:param commit:

Commit object, Reference Object or string identifying a revision we

should reset HEAD to.

:param index:

If True, the index will be set to match the given commit. Otherwise

it will not be touched.

:param working_tree:

If True, the working tree will be forcefully adjusted to match the given

commit, possibly overwriting uncommitted changes without warning.

If working_tree is True, index must be true as well

:param paths:

Single path or list of paths relative to the git root directory

that are to be reset. This allows to partially reset individual files.

:param kwargs:

Additional arguments passed to git-reset.

:return: self"""

mode = "--soft"

add_arg = None

if index:

mode = "--mixed"

# it appears, some git-versions declare mixed and paths deprecated

# see http://github.com/Byron/GitPython/issues#issue/2

if paths:

mode = None

# END special case

# END handle index

if working_tree:

mode = "--hard"

if not index:

raise ValueError("Cannot reset the working tree if the index is not reset as well")

# END working tree handling

if paths:

add_arg = "--"

# END nicely separate paths from rest

try:

self.repo.git.reset(mode, commit, add_arg, paths, **kwargs)

except GitCommandError, e:

# git nowadays may use 1 as status to indicate there are still unstaged

# modifications after the reset

if e.status != 1:

raise

# END handle exception

return self

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