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"""Module with additional types used by the index"""
from binascii import b2a_hex
from pathlib import Path
from .util import pack, unpack
from git.objects import Blob
# typing ----------------------------------------------------------------------
from typing import NamedTuple, Sequence, TYPE_CHECKING, Tuple, Union, cast, List
from git.types import PathLike
if TYPE_CHECKING:
from git.repo import Repo
StageType = int
# ---------------------------------------------------------------------------------
__all__ = ("BlobFilter", "BaseIndexEntry", "IndexEntry", "StageType")
# { Invariants
CE_NAMEMASK = 0x0FFF
CE_STAGEMASK = 0x3000
CE_EXTENDED = 0x4000
CE_VALID = 0x8000
CE_STAGESHIFT = 12
# } END invariants
class BlobFilter(object):
"""
Predicate to be used by iter_blobs allowing to filter only return blobs which
match the given list of directories or files.
The given paths are given relative to the repository.
"""
__slots__ = "paths"
def __init__(self, paths: Sequence[PathLike]) -> None:
"""
:param paths:
tuple or list of paths which are either pointing to directories or
to files relative to the current repository
"""
self.paths = paths
def __call__(self, stage_blob: Tuple[StageType, Blob]) -> bool:
blob_pathlike: PathLike = stage_blob[1].path
blob_path: Path = blob_pathlike if isinstance(blob_pathlike, Path) else Path(blob_pathlike)
for pathlike in self.paths:
path: Path = pathlike if isinstance(pathlike, Path) else Path(pathlike)
# TODO: Change to use `PosixPath.is_relative_to` once Python 3.8 is no longer supported.
filter_parts: List[str] = path.parts
blob_parts: List[str] = blob_path.parts
if len(filter_parts) > len(blob_parts):
continue
if all(i == j for i, j in zip(filter_parts, blob_parts)):
return True
return False
class BaseIndexEntryHelper(NamedTuple):
"""Typed namedtuple to provide named attribute access for BaseIndexEntry.
Needed to allow overriding __new__ in child class to preserve backwards compat."""
mode: int
binsha: bytes
flags: int
path: PathLike
ctime_bytes: bytes = pack(">LL", 0, 0)
mtime_bytes: bytes = pack(">LL", 0, 0)
dev: int = 0
inode: int = 0
uid: int = 0
gid: int = 0
size: int = 0
class BaseIndexEntry(BaseIndexEntryHelper):
"""Small Brother of an index entry which can be created to describe changes
done to the index in which case plenty of additional information is not required.
As the first 4 data members match exactly to the IndexEntry type, methods
expecting a BaseIndexEntry can also handle full IndexEntries even if they
use numeric indices for performance reasons.
"""
def __new__(
cls,
inp_tuple: Union[
Tuple[int, bytes, int, PathLike],
Tuple[int, bytes, int, PathLike, bytes, bytes, int, int, int, int, int],
],
) -> "BaseIndexEntry":
"""Override __new__ to allow construction from a tuple for backwards compatibility"""
return super().__new__(cls, *inp_tuple)
def __str__(self) -> str:
return "%o %s %i\t%s" % (self.mode, self.hexsha, self.stage, self.path)
def __repr__(self) -> str:
return "(%o, %s, %i, %s)" % (self.mode, self.hexsha, self.stage, self.path)
@property
def hexsha(self) -> str:
"""hex version of our sha"""
return b2a_hex(self.binsha).decode("ascii")
@property
def stage(self) -> int:
"""Stage of the entry, either:
* 0 = default stage
* 1 = stage before a merge or common ancestor entry in case of a 3 way merge
* 2 = stage of entries from the 'left' side of the merge
* 3 = stage of entries from the right side of the merge
:note: For more information, see http://www.kernel.org/pub/software/scm/git/docs/git-read-tree.html
"""
return (self.flags & CE_STAGEMASK) >> CE_STAGESHIFT
@classmethod
def from_blob(cls, blob: Blob, stage: int = 0) -> "BaseIndexEntry":
""":return: Fully equipped BaseIndexEntry at the given stage"""
return cls((blob.mode, blob.binsha, stage << CE_STAGESHIFT, blob.path))
def to_blob(self, repo: "Repo") -> Blob:
""":return: Blob using the information of this index entry"""
return Blob(repo, self.binsha, self.mode, self.path)
class IndexEntry(BaseIndexEntry):
"""Allows convenient access to IndexEntry data without completely unpacking it.
Attributes usully accessed often are cached in the tuple whereas others are
unpacked on demand.
See the properties for a mapping between names and tuple indices."""
@property
def ctime(self) -> Tuple[int, int]:
"""
:return:
Tuple(int_time_seconds_since_epoch, int_nano_seconds) of the
file's creation time"""
return cast(Tuple[int, int], unpack(">LL", self.ctime_bytes))
@property
def mtime(self) -> Tuple[int, int]:
"""See ctime property, but returns modification time"""
return cast(Tuple[int, int], unpack(">LL", self.mtime_bytes))
@classmethod
def from_base(cls, base: "BaseIndexEntry") -> "IndexEntry":
"""
:return:
Minimal entry as created from the given BaseIndexEntry instance.
Missing values will be set to null-like values
:param base: Instance of type BaseIndexEntry"""
time = pack(">LL", 0, 0)
return IndexEntry((base.mode, base.binsha, base.flags, base.path, time, time, 0, 0, 0, 0, 0))
@classmethod
def from_blob(cls, blob: Blob, stage: int = 0) -> "IndexEntry":
""":return: Minimal entry resembling the given blob object"""
time = pack(">LL", 0, 0)
return IndexEntry(
(
blob.mode,
blob.binsha,
stage << CE_STAGESHIFT,
blob.path,
time,
time,
0,
0,
0,
0,
blob.size,
)
)
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