mirror of https://github.com/morpheus65535/bazarr
518 lines
18 KiB
Python
518 lines
18 KiB
Python
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# diff.py
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# Copyright (C) 2008, 2009 Michael Trier (mtrier@gmail.com) and contributors
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#
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# This module is part of GitPython and is released under
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# the BSD License: http://www.opensource.org/licenses/bsd-license.php
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import re
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from git.cmd import handle_process_output
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from git.compat import (
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defenc,
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PY3
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)
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from git.util import finalize_process, hex_to_bin
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from .compat import binary_type
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from .objects.blob import Blob
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from .objects.util import mode_str_to_int
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__all__ = ('Diffable', 'DiffIndex', 'Diff', 'NULL_TREE')
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# Special object to compare against the empty tree in diffs
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NULL_TREE = object()
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_octal_byte_re = re.compile(b'\\\\([0-9]{3})')
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def _octal_repl(matchobj):
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value = matchobj.group(1)
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value = int(value, 8)
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if PY3:
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value = bytes(bytearray((value,)))
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else:
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value = chr(value)
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return value
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def decode_path(path, has_ab_prefix=True):
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if path == b'/dev/null':
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return None
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if path.startswith(b'"') and path.endswith(b'"'):
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path = (path[1:-1].replace(b'\\n', b'\n')
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.replace(b'\\t', b'\t')
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.replace(b'\\"', b'"')
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.replace(b'\\\\', b'\\'))
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path = _octal_byte_re.sub(_octal_repl, path)
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if has_ab_prefix:
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assert path.startswith(b'a/') or path.startswith(b'b/')
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path = path[2:]
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return path
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class Diffable(object):
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"""Common interface for all object that can be diffed against another object of compatible type.
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:note:
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Subclasses require a repo member as it is the case for Object instances, for practical
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reasons we do not derive from Object."""
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__slots__ = ()
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# standin indicating you want to diff against the index
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class Index(object):
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pass
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def _process_diff_args(self, args):
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"""
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:return:
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possibly altered version of the given args list.
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Method is called right before git command execution.
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Subclasses can use it to alter the behaviour of the superclass"""
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return args
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def diff(self, other=Index, paths=None, create_patch=False, **kwargs):
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"""Creates diffs between two items being trees, trees and index or an
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index and the working tree. It will detect renames automatically.
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:param other:
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Is the item to compare us with.
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If None, we will be compared to the working tree.
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If Treeish, it will be compared against the respective tree
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If Index ( type ), it will be compared against the index.
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If git.NULL_TREE, it will compare against the empty tree.
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It defaults to Index to assure the method will not by-default fail
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on bare repositories.
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:param paths:
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is a list of paths or a single path to limit the diff to.
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It will only include at least one of the given path or paths.
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:param create_patch:
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If True, the returned Diff contains a detailed patch that if applied
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makes the self to other. Patches are somewhat costly as blobs have to be read
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and diffed.
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:param kwargs:
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Additional arguments passed to git-diff, such as
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R=True to swap both sides of the diff.
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:return: git.DiffIndex
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:note:
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On a bare repository, 'other' needs to be provided as Index or as
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as Tree/Commit, or a git command error will occur"""
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args = []
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args.append("--abbrev=40") # we need full shas
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args.append("--full-index") # get full index paths, not only filenames
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args.append("-M") # check for renames, in both formats
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if create_patch:
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args.append("-p")
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else:
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args.append("--raw")
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# in any way, assure we don't see colored output,
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# fixes https://github.com/gitpython-developers/GitPython/issues/172
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args.append('--no-color')
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if paths is not None and not isinstance(paths, (tuple, list)):
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paths = [paths]
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diff_cmd = self.repo.git.diff
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if other is self.Index:
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args.insert(0, '--cached')
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elif other is NULL_TREE:
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args.insert(0, '-r') # recursive diff-tree
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args.insert(0, '--root')
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diff_cmd = self.repo.git.diff_tree
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elif other is not None:
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args.insert(0, '-r') # recursive diff-tree
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args.insert(0, other)
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diff_cmd = self.repo.git.diff_tree
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args.insert(0, self)
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# paths is list here or None
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if paths:
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args.append("--")
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args.extend(paths)
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# END paths handling
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kwargs['as_process'] = True
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proc = diff_cmd(*self._process_diff_args(args), **kwargs)
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diff_method = (Diff._index_from_patch_format
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if create_patch
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else Diff._index_from_raw_format)
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index = diff_method(self.repo, proc)
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proc.wait()
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return index
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class DiffIndex(list):
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"""Implements an Index for diffs, allowing a list of Diffs to be queried by
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the diff properties.
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The class improves the diff handling convenience"""
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# change type invariant identifying possible ways a blob can have changed
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# A = Added
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# D = Deleted
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# R = Renamed
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# M = Modified
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# T = Changed in the type
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change_type = ("A", "D", "R", "M", "T")
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def iter_change_type(self, change_type):
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"""
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:return:
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iterator yielding Diff instances that match the given change_type
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:param change_type:
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Member of DiffIndex.change_type, namely:
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* 'A' for added paths
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* 'D' for deleted paths
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* 'R' for renamed paths
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* 'M' for paths with modified data
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* 'T' for changed in the type paths
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"""
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if change_type not in self.change_type:
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raise ValueError("Invalid change type: %s" % change_type)
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for diff in self:
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if diff.change_type == change_type:
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yield diff
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elif change_type == "A" and diff.new_file:
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yield diff
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elif change_type == "D" and diff.deleted_file:
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yield diff
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elif change_type == "R" and diff.renamed:
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yield diff
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elif change_type == "M" and diff.a_blob and diff.b_blob and diff.a_blob != diff.b_blob:
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yield diff
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# END for each diff
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class Diff(object):
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"""A Diff contains diff information between two Trees.
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It contains two sides a and b of the diff, members are prefixed with
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"a" and "b" respectively to inidcate that.
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Diffs keep information about the changed blob objects, the file mode, renames,
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deletions and new files.
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There are a few cases where None has to be expected as member variable value:
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``New File``::
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a_mode is None
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a_blob is None
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a_path is None
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``Deleted File``::
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b_mode is None
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b_blob is None
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b_path is None
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``Working Tree Blobs``
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When comparing to working trees, the working tree blob will have a null hexsha
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as a corresponding object does not yet exist. The mode will be null as well.
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But the path will be available though.
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If it is listed in a diff the working tree version of the file must
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be different to the version in the index or tree, and hence has been modified."""
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# precompiled regex
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re_header = re.compile(br"""
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^diff[ ]--git
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[ ](?P<a_path_fallback>"?a/.+?"?)[ ](?P<b_path_fallback>"?b/.+?"?)\n
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(?:^old[ ]mode[ ](?P<old_mode>\d+)\n
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^new[ ]mode[ ](?P<new_mode>\d+)(?:\n|$))?
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(?:^similarity[ ]index[ ]\d+%\n
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^rename[ ]from[ ](?P<rename_from>.*)\n
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^rename[ ]to[ ](?P<rename_to>.*)(?:\n|$))?
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(?:^new[ ]file[ ]mode[ ](?P<new_file_mode>.+)(?:\n|$))?
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(?:^deleted[ ]file[ ]mode[ ](?P<deleted_file_mode>.+)(?:\n|$))?
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(?:^index[ ](?P<a_blob_id>[0-9A-Fa-f]+)
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\.\.(?P<b_blob_id>[0-9A-Fa-f]+)[ ]?(?P<b_mode>.+)?(?:\n|$))?
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(?:^---[ ](?P<a_path>[^\t\n\r\f\v]*)[\t\r\f\v]*(?:\n|$))?
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(?:^\+\+\+[ ](?P<b_path>[^\t\n\r\f\v]*)[\t\r\f\v]*(?:\n|$))?
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""", re.VERBOSE | re.MULTILINE)
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# can be used for comparisons
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NULL_HEX_SHA = "0" * 40
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NULL_BIN_SHA = b"\0" * 20
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__slots__ = ("a_blob", "b_blob", "a_mode", "b_mode", "a_rawpath", "b_rawpath",
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"new_file", "deleted_file", "raw_rename_from", "raw_rename_to",
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"diff", "change_type", "score")
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def __init__(self, repo, a_rawpath, b_rawpath, a_blob_id, b_blob_id, a_mode,
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b_mode, new_file, deleted_file, raw_rename_from,
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raw_rename_to, diff, change_type, score):
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self.a_mode = a_mode
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self.b_mode = b_mode
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assert a_rawpath is None or isinstance(a_rawpath, binary_type)
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assert b_rawpath is None or isinstance(b_rawpath, binary_type)
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self.a_rawpath = a_rawpath
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self.b_rawpath = b_rawpath
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if self.a_mode:
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self.a_mode = mode_str_to_int(self.a_mode)
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if self.b_mode:
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self.b_mode = mode_str_to_int(self.b_mode)
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if a_blob_id is None or a_blob_id == self.NULL_HEX_SHA:
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self.a_blob = None
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else:
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self.a_blob = Blob(repo, hex_to_bin(a_blob_id), mode=self.a_mode, path=self.a_path)
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if b_blob_id is None or b_blob_id == self.NULL_HEX_SHA:
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self.b_blob = None
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else:
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self.b_blob = Blob(repo, hex_to_bin(b_blob_id), mode=self.b_mode, path=self.b_path)
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self.new_file = new_file
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self.deleted_file = deleted_file
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# be clear and use None instead of empty strings
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assert raw_rename_from is None or isinstance(raw_rename_from, binary_type)
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assert raw_rename_to is None or isinstance(raw_rename_to, binary_type)
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self.raw_rename_from = raw_rename_from or None
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self.raw_rename_to = raw_rename_to or None
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self.diff = diff
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self.change_type = change_type
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self.score = score
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def __eq__(self, other):
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for name in self.__slots__:
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if getattr(self, name) != getattr(other, name):
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return False
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# END for each name
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return True
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def __ne__(self, other):
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return not (self == other)
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def __hash__(self):
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return hash(tuple(getattr(self, n) for n in self.__slots__))
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def __str__(self):
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h = "%s"
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if self.a_blob:
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h %= self.a_blob.path
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elif self.b_blob:
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h %= self.b_blob.path
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msg = ''
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line = None # temp line
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line_length = 0 # line length
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for b, n in zip((self.a_blob, self.b_blob), ('lhs', 'rhs')):
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if b:
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line = "\n%s: %o | %s" % (n, b.mode, b.hexsha)
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else:
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line = "\n%s: None" % n
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# END if blob is not None
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line_length = max(len(line), line_length)
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msg += line
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# END for each blob
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# add headline
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h += '\n' + '=' * line_length
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if self.deleted_file:
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msg += '\nfile deleted in rhs'
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if self.new_file:
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msg += '\nfile added in rhs'
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if self.rename_from:
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msg += '\nfile renamed from %r' % self.rename_from
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if self.rename_to:
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msg += '\nfile renamed to %r' % self.rename_to
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if self.diff:
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msg += '\n---'
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try:
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msg += self.diff.decode(defenc)
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except UnicodeDecodeError:
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msg += 'OMITTED BINARY DATA'
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# end handle encoding
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msg += '\n---'
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# END diff info
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# Python2 silliness: have to assure we convert our likely to be unicode object to a string with the
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# right encoding. Otherwise it tries to convert it using ascii, which may fail ungracefully
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res = h + msg
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if not PY3:
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res = res.encode(defenc)
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# end
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return res
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@property
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def a_path(self):
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return self.a_rawpath.decode(defenc, 'replace') if self.a_rawpath else None
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@property
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def b_path(self):
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return self.b_rawpath.decode(defenc, 'replace') if self.b_rawpath else None
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|
|
||
|
|
@property
|
||
|
|
def rename_from(self):
|
||
|
|
return self.raw_rename_from.decode(defenc, 'replace') if self.raw_rename_from else None
|
||
|
|
|
||
|
|
@property
|
||
|
|
def rename_to(self):
|
||
|
|
return self.raw_rename_to.decode(defenc, 'replace') if self.raw_rename_to else None
|
||
|
|
|
||
|
|
@property
|
||
|
|
def renamed(self):
|
||
|
|
""":returns: True if the blob of our diff has been renamed
|
||
|
|
:note: This property is deprecated, please use ``renamed_file`` instead.
|
||
|
|
"""
|
||
|
|
return self.renamed_file
|
||
|
|
|
||
|
|
@property
|
||
|
|
def renamed_file(self):
|
||
|
|
""":returns: True if the blob of our diff has been renamed
|
||
|
|
:note: This property is deprecated, please use ``renamed_file`` instead.
|
||
|
|
"""
|
||
|
|
return self.rename_from != self.rename_to
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def _pick_best_path(cls, path_match, rename_match, path_fallback_match):
|
||
|
|
if path_match:
|
||
|
|
return decode_path(path_match)
|
||
|
|
|
||
|
|
if rename_match:
|
||
|
|
return decode_path(rename_match, has_ab_prefix=False)
|
||
|
|
|
||
|
|
if path_fallback_match:
|
||
|
|
return decode_path(path_fallback_match)
|
||
|
|
|
||
|
|
return None
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def _index_from_patch_format(cls, repo, proc):
|
||
|
|
"""Create a new DiffIndex from the given text which must be in patch format
|
||
|
|
:param repo: is the repository we are operating on - it is required
|
||
|
|
:param stream: result of 'git diff' as a stream (supporting file protocol)
|
||
|
|
:return: git.DiffIndex """
|
||
|
|
|
||
|
|
## FIXME: Here SLURPING raw, need to re-phrase header-regexes linewise.
|
||
|
|
text = []
|
||
|
|
handle_process_output(proc, text.append, None, finalize_process, decode_streams=False)
|
||
|
|
|
||
|
|
# for now, we have to bake the stream
|
||
|
|
text = b''.join(text)
|
||
|
|
index = DiffIndex()
|
||
|
|
previous_header = None
|
||
|
|
for header in cls.re_header.finditer(text):
|
||
|
|
a_path_fallback, b_path_fallback, \
|
||
|
|
old_mode, new_mode, \
|
||
|
|
rename_from, rename_to, \
|
||
|
|
new_file_mode, deleted_file_mode, \
|
||
|
|
a_blob_id, b_blob_id, b_mode, \
|
||
|
|
a_path, b_path = header.groups()
|
||
|
|
|
||
|
|
new_file, deleted_file = bool(new_file_mode), bool(deleted_file_mode)
|
||
|
|
|
||
|
|
a_path = cls._pick_best_path(a_path, rename_from, a_path_fallback)
|
||
|
|
b_path = cls._pick_best_path(b_path, rename_to, b_path_fallback)
|
||
|
|
|
||
|
|
# Our only means to find the actual text is to see what has not been matched by our regex,
|
||
|
|
# and then retro-actively assign it to our index
|
||
|
|
if previous_header is not None:
|
||
|
|
index[-1].diff = text[previous_header.end():header.start()]
|
||
|
|
# end assign actual diff
|
||
|
|
|
||
|
|
# Make sure the mode is set if the path is set. Otherwise the resulting blob is invalid
|
||
|
|
# We just use the one mode we should have parsed
|
||
|
|
a_mode = old_mode or deleted_file_mode or (a_path and (b_mode or new_mode or new_file_mode))
|
||
|
|
b_mode = b_mode or new_mode or new_file_mode or (b_path and a_mode)
|
||
|
|
index.append(Diff(repo,
|
||
|
|
a_path,
|
||
|
|
b_path,
|
||
|
|
a_blob_id and a_blob_id.decode(defenc),
|
||
|
|
b_blob_id and b_blob_id.decode(defenc),
|
||
|
|
a_mode and a_mode.decode(defenc),
|
||
|
|
b_mode and b_mode.decode(defenc),
|
||
|
|
new_file, deleted_file,
|
||
|
|
rename_from,
|
||
|
|
rename_to,
|
||
|
|
None, None, None))
|
||
|
|
|
||
|
|
previous_header = header
|
||
|
|
# end for each header we parse
|
||
|
|
if index:
|
||
|
|
index[-1].diff = text[header.end():]
|
||
|
|
# end assign last diff
|
||
|
|
|
||
|
|
return index
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def _index_from_raw_format(cls, repo, proc):
|
||
|
|
"""Create a new DiffIndex from the given stream which must be in raw format.
|
||
|
|
:return: git.DiffIndex"""
|
||
|
|
# handles
|
||
|
|
# :100644 100644 687099101... 37c5e30c8... M .gitignore
|
||
|
|
|
||
|
|
index = DiffIndex()
|
||
|
|
|
||
|
|
def handle_diff_line(line):
|
||
|
|
line = line.decode(defenc)
|
||
|
|
if not line.startswith(":"):
|
||
|
|
return
|
||
|
|
|
||
|
|
meta, _, path = line[1:].partition('\t')
|
||
|
|
old_mode, new_mode, a_blob_id, b_blob_id, _change_type = meta.split(None, 4)
|
||
|
|
# Change type can be R100
|
||
|
|
# R: status letter
|
||
|
|
# 100: score (in case of copy and rename)
|
||
|
|
change_type = _change_type[0]
|
||
|
|
score_str = ''.join(_change_type[1:])
|
||
|
|
score = int(score_str) if score_str.isdigit() else None
|
||
|
|
path = path.strip()
|
||
|
|
a_path = path.encode(defenc)
|
||
|
|
b_path = path.encode(defenc)
|
||
|
|
deleted_file = False
|
||
|
|
new_file = False
|
||
|
|
rename_from = None
|
||
|
|
rename_to = None
|
||
|
|
|
||
|
|
# NOTE: We cannot conclude from the existence of a blob to change type
|
||
|
|
# as diffs with the working do not have blobs yet
|
||
|
|
if change_type == 'D':
|
||
|
|
b_blob_id = None
|
||
|
|
deleted_file = True
|
||
|
|
elif change_type == 'A':
|
||
|
|
a_blob_id = None
|
||
|
|
new_file = True
|
||
|
|
elif change_type == 'R':
|
||
|
|
a_path, b_path = path.split('\t', 1)
|
||
|
|
a_path = a_path.encode(defenc)
|
||
|
|
b_path = b_path.encode(defenc)
|
||
|
|
rename_from, rename_to = a_path, b_path
|
||
|
|
elif change_type == 'T':
|
||
|
|
# Nothing to do
|
||
|
|
pass
|
||
|
|
# END add/remove handling
|
||
|
|
|
||
|
|
diff = Diff(repo, a_path, b_path, a_blob_id, b_blob_id, old_mode, new_mode,
|
||
|
|
new_file, deleted_file, rename_from, rename_to, '',
|
||
|
|
change_type, score)
|
||
|
|
index.append(diff)
|
||
|
|
|
||
|
|
handle_process_output(proc, handle_diff_line, None, finalize_process, decode_streams=False)
|
||
|
|
|
||
|
|
return index
|