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# Copyright (C) 2008, 2009 Michael Trier (mtrier@gmail.com) and contributors
#
# This module is part of GitPython and is released under the
# 3-Clause BSD License: https://opensource.org/license/bsd-3-clause/
import re
from git.cmd import handle_process_output
from git.compat import defenc
from git.util import finalize_process, hex_to_bin
from .objects.blob import Blob
from .objects.util import mode_str_to_int
# typing ------------------------------------------------------------------
from typing import (
Any,
Iterator,
List,
Match,
Optional,
Tuple,
Type,
TypeVar,
Union,
TYPE_CHECKING,
cast,
)
from git.types import PathLike, Literal
if TYPE_CHECKING:
from .objects.tree import Tree
from .objects import Commit
from git.repo.base import Repo
from git.objects.base import IndexObject
from subprocess import Popen
from git import Git
Lit_change_type = Literal["A", "D", "C", "M", "R", "T", "U"]
# def is_change_type(inp: str) -> TypeGuard[Lit_change_type]:
# # return True
# return inp in ['A', 'D', 'C', 'M', 'R', 'T', 'U']
# ------------------------------------------------------------------------
__all__ = ("Diffable", "DiffIndex", "Diff", "NULL_TREE")
NULL_TREE = object()
"""Special object to compare against the empty tree in diffs."""
_octal_byte_re = re.compile(rb"\\([0-9]{3})")
def _octal_repl(matchobj: Match) -> bytes:
value = matchobj.group(1)
value = int(value, 8)
value = bytes(bytearray((value,)))
return value
def decode_path(path: bytes, has_ab_prefix: bool = True) -> Optional[bytes]:
if path == b"/dev/null":
return None
if path.startswith(b'"') and path.endswith(b'"'):
path = path[1:-1].replace(b"\\n", b"\n").replace(b"\\t", b"\t").replace(b'\\"', b'"').replace(b"\\\\", b"\\")
path = _octal_byte_re.sub(_octal_repl, path)
if has_ab_prefix:
assert path.startswith(b"a/") or path.startswith(b"b/")
path = path[2:]
return path
class Diffable:
"""Common interface for all objects that can be diffed against another object of
compatible type.
:note:
Subclasses require a repo member as it is the case for Object instances, for
practical reasons we do not derive from Object.
"""
__slots__ = ()
class Index:
"""Stand-in indicating you want to diff against the index."""
def _process_diff_args(
self, args: List[Union[str, "Diffable", Type["Diffable.Index"], object]]
) -> List[Union[str, "Diffable", Type["Diffable.Index"], object]]:
"""
:return:
Possibly altered version of the given args list.
This method is called right before git command execution.
Subclasses can use it to alter the behaviour of the superclass.
"""
return args
def diff(
self,
other: Union[Type["Index"], "Tree", "Commit", None, str, object] = Index,
paths: Union[PathLike, List[PathLike], Tuple[PathLike, ...], None] = None,
create_patch: bool = False,
**kwargs: Any,
) -> "DiffIndex":
"""Create diffs between two items being trees, trees and index or an
index and the working tree. Detects renames automatically.
:param other:
This the item to compare us with.
* If None, we will be compared to the working tree.
* If :class:`~git.index.base.Treeish`, it will be compared against the
respective tree.
* If :class:`~Diffable.Index`, it will be compared against the index.
* If :attr:`git.NULL_TREE`, it will compare against the empty tree.
* It defaults to :class:`~Diffable.Index` so that the method will not by
default fail on bare repositories.
:param paths:
This a list of paths or a single path to limit the diff to. It will only
include at least one of the given path or paths.
:param create_patch:
If True, the returned :class:`Diff` contains a detailed patch that if
applied makes the self to other. Patches are somewhat costly as blobs have
to be read and diffed.
:param kwargs:
Additional arguments passed to git-diff, such as ``R=True`` to swap both
sides of the diff.
:return: git.DiffIndex
:note:
On a bare repository, 'other' needs to be provided as
:class:`~Diffable.Index`, or as :class:`~git.objects.tree.Tree` or
:class:`~git.objects.commit.Commit`, or a git command error will occur.
"""
args: List[Union[PathLike, Diffable, Type["Diffable.Index"], object]] = []
args.append("--abbrev=40") # We need full shas.
args.append("--full-index") # Get full index paths, not only filenames.
# Remove default '-M' arg (check for renames) if user is overriding it.
if not any(x in kwargs for x in ("find_renames", "no_renames", "M")):
args.append("-M")
if create_patch:
args.append("-p")
else:
args.append("--raw")
args.append("-z")
# Ensure we never see colored output.
# Fixes: https://github.com/gitpython-developers/GitPython/issues/172
args.append("--no-color")
if paths is not None and not isinstance(paths, (tuple, list)):
paths = [paths]
if hasattr(self, "Has_Repo"):
self.repo: "Repo" = self.repo
diff_cmd = self.repo.git.diff
if other is self.Index:
args.insert(0, "--cached")
elif other is NULL_TREE:
args.insert(0, "-r") # Recursive diff-tree.
args.insert(0, "--root")
diff_cmd = self.repo.git.diff_tree
elif other is not None:
args.insert(0, "-r") # Recursive diff-tree.
args.insert(0, other)
diff_cmd = self.repo.git.diff_tree
args.insert(0, self)
# paths is list here, or None.
if paths:
args.append("--")
args.extend(paths)
# END paths handling
kwargs["as_process"] = True
proc = diff_cmd(*self._process_diff_args(args), **kwargs)
diff_method = Diff._index_from_patch_format if create_patch else Diff._index_from_raw_format
index = diff_method(self.repo, proc)
proc.wait()
return index
T_Diff = TypeVar("T_Diff", bound="Diff")
class DiffIndex(List[T_Diff]):
"""An Index for diffs, allowing a list of Diffs to be queried by the diff
properties.
The class improves the diff handling convenience.
"""
change_type = ("A", "C", "D", "R", "M", "T")
"""Change type invariant identifying possible ways a blob can have changed:
* ``A`` = Added
* ``D`` = Deleted
* ``R`` = Renamed
* ``M`` = Modified
* ``T`` = Changed in the type
"""
def iter_change_type(self, change_type: Lit_change_type) -> Iterator[T_Diff]:
"""
:return:
Iterator yielding :class:`Diff` instances that match the given `change_type`
:param change_type:
Member of :attr:`DiffIndex.change_type`, namely:
* 'A' for added paths
* 'D' for deleted paths
* 'R' for renamed paths
* 'M' for paths with modified data
* 'T' for changed in the type paths
"""
if change_type not in self.change_type:
raise ValueError("Invalid change type: %s" % change_type)
for diffidx in self:
if diffidx.change_type == change_type:
yield diffidx
elif change_type == "A" and diffidx.new_file:
yield diffidx
elif change_type == "D" and diffidx.deleted_file:
yield diffidx
elif change_type == "C" and diffidx.copied_file:
yield diffidx
elif change_type == "R" and diffidx.renamed:
yield diffidx
elif change_type == "M" and diffidx.a_blob and diffidx.b_blob and diffidx.a_blob != diffidx.b_blob:
yield diffidx
# END for each diff
class Diff:
"""A Diff contains diff information between two Trees.
It contains two sides a and b of the diff, members are prefixed with
"a" and "b" respectively to indicate that.
Diffs keep information about the changed blob objects, the file mode, renames,
deletions and new files.
There are a few cases where None has to be expected as member variable value:
``New File``::
a_mode is None
a_blob is None
a_path is None
``Deleted File``::
b_mode is None
b_blob is None
b_path is None
``Working Tree Blobs``
When comparing to working trees, the working tree blob will have a null hexsha
as a corresponding object does not yet exist. The mode will be null as well.
The path will be available, though.
If it is listed in a diff, the working tree version of the file must
differ from the version in the index or tree, and hence has been modified.
"""
# Precompiled regex.
re_header = re.compile(
rb"""
^diff[ ]--git
[ ](?P<a_path_fallback>"?[ab]/.+?"?)[ ](?P<b_path_fallback>"?[ab]/.+?"?)\n
(?:^old[ ]mode[ ](?P<old_mode>\d+)\n
^new[ ]mode[ ](?P<new_mode>\d+)(?:\n|$))?
(?:^similarity[ ]index[ ]\d+%\n
^rename[ ]from[ ](?P<rename_from>.*)\n
^rename[ ]to[ ](?P<rename_to>.*)(?:\n|$))?
(?:^new[ ]file[ ]mode[ ](?P<new_file_mode>.+)(?:\n|$))?
(?:^deleted[ ]file[ ]mode[ ](?P<deleted_file_mode>.+)(?:\n|$))?
(?:^similarity[ ]index[ ]\d+%\n
^copy[ ]from[ ].*\n
^copy[ ]to[ ](?P<copied_file_name>.*)(?:\n|$))?
(?:^index[ ](?P<a_blob_id>[0-9A-Fa-f]+)
\.\.(?P<b_blob_id>[0-9A-Fa-f]+)[ ]?(?P<b_mode>.+)?(?:\n|$))?
(?:^---[ ](?P<a_path>[^\t\n\r\f\v]*)[\t\r\f\v]*(?:\n|$))?
(?:^\+\+\+[ ](?P<b_path>[^\t\n\r\f\v]*)[\t\r\f\v]*(?:\n|$))?
""",
re.VERBOSE | re.MULTILINE,
)
# These can be used for comparisons.
NULL_HEX_SHA = "0" * 40
NULL_BIN_SHA = b"\0" * 20
__slots__ = (
"a_blob",
"b_blob",
"a_mode",
"b_mode",
"a_rawpath",
"b_rawpath",
"new_file",
"deleted_file",
"copied_file",
"raw_rename_from",
"raw_rename_to",
"diff",
"change_type",
"score",
)
def __init__(
self,
repo: "Repo",
a_rawpath: Optional[bytes],
b_rawpath: Optional[bytes],
a_blob_id: Union[str, bytes, None],
b_blob_id: Union[str, bytes, None],
a_mode: Union[bytes, str, None],
b_mode: Union[bytes, str, None],
new_file: bool,
deleted_file: bool,
copied_file: bool,
raw_rename_from: Optional[bytes],
raw_rename_to: Optional[bytes],
diff: Union[str, bytes, None],
change_type: Optional[Lit_change_type],
score: Optional[int],
) -> None:
assert a_rawpath is None or isinstance(a_rawpath, bytes)
assert b_rawpath is None or isinstance(b_rawpath, bytes)
self.a_rawpath = a_rawpath
self.b_rawpath = b_rawpath
self.a_mode = mode_str_to_int(a_mode) if a_mode else None
self.b_mode = mode_str_to_int(b_mode) if b_mode else None
# Determine whether this diff references a submodule. If it does then
# we need to overwrite "repo" to the corresponding submodule's repo instead.
if repo and a_rawpath:
for submodule in repo.submodules:
if submodule.path == a_rawpath.decode(defenc, "replace"):
if submodule.module_exists():
repo = submodule.module()
break
self.a_blob: Union["IndexObject", None]
if a_blob_id is None or a_blob_id == self.NULL_HEX_SHA:
self.a_blob = None
else:
self.a_blob = Blob(repo, hex_to_bin(a_blob_id), mode=self.a_mode, path=self.a_path)
self.b_blob: Union["IndexObject", None]
if b_blob_id is None or b_blob_id == self.NULL_HEX_SHA:
self.b_blob = None
else:
self.b_blob = Blob(repo, hex_to_bin(b_blob_id), mode=self.b_mode, path=self.b_path)
self.new_file: bool = new_file
self.deleted_file: bool = deleted_file
self.copied_file: bool = copied_file
# Be clear and use None instead of empty strings.
assert raw_rename_from is None or isinstance(raw_rename_from, bytes)
assert raw_rename_to is None or isinstance(raw_rename_to, bytes)
self.raw_rename_from = raw_rename_from or None
self.raw_rename_to = raw_rename_to or None
self.diff = diff
self.change_type: Union[Lit_change_type, None] = change_type
self.score = score
def __eq__(self, other: object) -> bool:
for name in self.__slots__:
if getattr(self, name) != getattr(other, name):
return False
# END for each name
return True
def __ne__(self, other: object) -> bool:
return not (self == other)
def __hash__(self) -> int:
return hash(tuple(getattr(self, n) for n in self.__slots__))
def __str__(self) -> str:
h = "%s"
if self.a_blob:
h %= self.a_blob.path
elif self.b_blob:
h %= self.b_blob.path
msg = ""
line = None
line_length = 0
for b, n in zip((self.a_blob, self.b_blob), ("lhs", "rhs")):
if b:
line = "\n%s: %o | %s" % (n, b.mode, b.hexsha)
else:
line = "\n%s: None" % n
# END if blob is not None
line_length = max(len(line), line_length)
msg += line
# END for each blob
# Add headline.
h += "\n" + "=" * line_length
if self.deleted_file:
msg += "\nfile deleted in rhs"
if self.new_file:
msg += "\nfile added in rhs"
if self.copied_file:
msg += "\nfile %r copied from %r" % (self.b_path, self.a_path)
if self.rename_from:
msg += "\nfile renamed from %r" % self.rename_from
if self.rename_to:
msg += "\nfile renamed to %r" % self.rename_to
if self.diff:
msg += "\n---"
try:
msg += self.diff.decode(defenc) if isinstance(self.diff, bytes) else self.diff
except UnicodeDecodeError:
msg += "OMITTED BINARY DATA"
# END handle encoding
msg += "\n---"
# END diff info
return h + msg
@property
def a_path(self) -> Optional[str]:
return self.a_rawpath.decode(defenc, "replace") if self.a_rawpath else None
@property
def b_path(self) -> Optional[str]:
return self.b_rawpath.decode(defenc, "replace") if self.b_rawpath else None
@property
def rename_from(self) -> Optional[str]:
return self.raw_rename_from.decode(defenc, "replace") if self.raw_rename_from else None
@property
def rename_to(self) -> Optional[str]:
return self.raw_rename_to.decode(defenc, "replace") if self.raw_rename_to else None
@property
def renamed(self) -> bool:
"""
:return: True if the blob of our diff has been renamed
:note: This property is deprecated.
Please use the :attr:`renamed_file` property instead.
"""
return self.renamed_file
@property
def renamed_file(self) -> bool:
""":return: True if the blob of our diff has been renamed"""
return self.rename_from != self.rename_to
@classmethod
def _pick_best_path(cls, path_match: bytes, rename_match: bytes, path_fallback_match: bytes) -> Optional[bytes]:
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: "Repo", proc: Union["Popen", "Git.AutoInterrupt"]) -> DiffIndex:
"""Create a new DiffIndex from the given process output which must be in patch format.
:param repo: The repository we are operating on
:param proc: ``git diff`` process to read from (supports :class:`Git.AutoInterrupt` wrapper)
:return: git.DiffIndex
"""
# FIXME: Here SLURPING raw, need to re-phrase header-regexes linewise.
text_list: List[bytes] = []
handle_process_output(proc, text_list.append, None, finalize_process, decode_streams=False)
# For now, we have to bake the stream.
text = b"".join(text_list)
index: "DiffIndex" = DiffIndex()
previous_header: Union[Match[bytes], None] = None
header: Union[Match[bytes], None] = None
a_path, b_path = None, None # For mypy.
a_mode, b_mode = None, None # For mypy.
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,
copied_file_name,
a_blob_id,
b_blob_id,
b_mode,
a_path,
b_path,
) = _header.groups()
new_file, deleted_file, copied_file = (
bool(new_file_mode),
bool(deleted_file_mode),
bool(copied_file_name),
)
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,
copied_file,
rename_from,
rename_to,
None,
None,
None,
)
)
previous_header = _header
header = _header
# END for each header we parse
if index and header:
index[-1].diff = text[header.end() :]
# END assign last diff
return index
@staticmethod
def _handle_diff_line(lines_bytes: bytes, repo: "Repo", index: DiffIndex) -> None:
lines = lines_bytes.decode(defenc)
# Discard everything before the first colon, and the colon itself.
_, _, lines = lines.partition(":")
for line in lines.split("\x00:"):
if not line:
# The line data is empty, skip.
continue
meta, _, path = line.partition("\x00")
path = path.rstrip("\x00")
a_blob_id: Optional[str]
b_blob_id: Optional[str]
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)
# assert is_change_type(_change_type[0]), f"Unexpected value for change_type received: {_change_type[0]}"
change_type: Lit_change_type = cast(Lit_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
copied_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 # Optional[str]
deleted_file = True
elif change_type == "A":
a_blob_id = None
new_file = True
elif change_type == "C":
copied_file = True
a_path_str, b_path_str = path.split("\x00", 1)
a_path = a_path_str.encode(defenc)
b_path = b_path_str.encode(defenc)
elif change_type == "R":
a_path_str, b_path_str = path.split("\x00", 1)
a_path = a_path_str.encode(defenc)
b_path = b_path_str.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,
copied_file,
rename_from,
rename_to,
"",
change_type,
score,
)
index.append(diff)
@classmethod
def _index_from_raw_format(cls, repo: "Repo", proc: "Popen") -> "DiffIndex":
"""Create a new DiffIndex from the given process output which must be in raw format.
:param repo: The repository we are operating on
:param proc: Process to read output from
:return: git.DiffIndex
"""
# handles
# :100644 100644 687099101... 37c5e30c8... M .gitignore
index: "DiffIndex" = DiffIndex()
handle_process_output(
proc,
lambda byt: cls._handle_diff_line(byt, repo, index),
None,
finalize_process,
decode_streams=False,
)
return index