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GitPython/git/index/util.py at 0.3.3 · gitpython-developers/GitPython · GitHub
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"""Module containing index utilities"""
import
struct
import
tempfile
import
os
__all__
=
(
'TemporaryFileSwap'
,
'post_clear_cache'
,
'default_index'
,
'git_working_dir'
)
#{ Aliases
pack
=
struct
.
pack
unpack
=
struct
.
unpack
#} END aliases
class
TemporaryFileSwap
(
object
):
"""Utility class moving a file to a temporary location within the same directory
and moving it back on to where on object deletion."""
__slots__
=
(
"file_path"
,
"tmp_file_path"
)
def
__init__
(
self
,
file_path
):
self
.
file_path
=
file_path
self
.
tmp_file_path
=
self
.
file_path
+
tempfile
.
mktemp
(
''
,
''
,
''
)
# it may be that the source does not exist
try
:
os
.
rename
(
self
.
file_path
,
self
.
tmp_file_path
)
except
OSError
:
pass
def
__del__
(
self
):
if
os
.
path
.
isfile
(
self
.
tmp_file_path
):
if
os
.
name
==
'nt'
and
os
.
path
.
exists
(
self
.
file_path
):
os
.
remove
(
self
.
file_path
)
os
.
rename
(
self
.
tmp_file_path
,
self
.
file_path
)
# END temp file exists
#{ Decorators
def
post_clear_cache
(
func
):
"""Decorator for functions that alter the index using the git command. This would
invalidate our possibly existing entries dictionary which is why it must be
deleted to allow it to be lazily reread later.
:note:
This decorator will not be required once all functions are implemented
natively which in fact is possible, but probably not feasible performance wise.
"""
def
post_clear_cache_if_not_raised
(
self
,
*
args
,
**
kwargs
):
rval
=
func
(
self
,
*
args
,
**
kwargs
)
self
.
_delete_entries_cache
()
return
rval
# END wrapper method
post_clear_cache_if_not_raised
.
__name__
=
func
.
__name__
return
post_clear_cache_if_not_raised
def
default_index
(
func
):
"""Decorator assuring the wrapped method may only run if we are the default
repository index. This is as we rely on git commands that operate
on that index only. """
def
check_default_index
(
self
,
*
args
,
**
kwargs
):
if
self
.
_file_path
!=
self
.
_index_path
():
raise
AssertionError
(
"Cannot call %r on indices that do not represent the default git index"
%
func
.
__name__
)
return
func
(
self
,
*
args
,
**
kwargs
)
# END wrpaper method
check_default_index
.
__name__
=
func
.
__name__
return
check_default_index
def
git_working_dir
(
func
):
"""Decorator which changes the current working dir to the one of the git
repository in order to assure relative paths are handled correctly"""
def
set_git_working_dir
(
self
,
*
args
,
**
kwargs
):
cur_wd
=
os
.
getcwd
()
os
.
chdir
(
self
.
repo
.
working_tree_dir
)
try
:
return
func
(
self
,
*
args
,
**
kwargs
)
finally
:
os
.
chdir
(
cur_wd
)
# END handle working dir
# END wrapper
set_git_working_dir
.
__name__
=
func
.
__name__
return
set_git_working_dir
#} END decorators
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