# Source code for fsspec.implementations.git

    import os

    import pygit2

    from fsspec.spec import AbstractFileSystem

    from .memory import MemoryFile

    class GitFileSystem(AbstractFileSystem):
        """Browse the files of a local git repo at any hash/tag/branch

        (experimental backend)
        """

        root_marker = ""
        cachable = True

        def __init__(self, path=None, fo=None, ref=None, **kwargs):
            """

            Parameters
            ----------
            path: str (optional)
                Local location of the repo (uses current directory if not given).
                May be deprecated in favour of ``fo``. When used with a higher
                level function such as fsspec.open(), may be of the form
                "git://[path-to-repo[:]][ref@]path/to/file" (but the actual
                file path should not contain "@" or ":").
            fo: str (optional)
                Same as ``path``, but passed as part of a chained URL. This one
                takes precedence if both are given.
            ref: str (optional)
                Reference to work with, could be a hash, tag or branch name. Defaults
                to current working tree. Note that ``ls`` and ``open`` also take hash,
                so this becomes the default for those operations
            kwargs
            """
            super().__init__(**kwargs)
            self.repo = pygit2.Repository(fo or path or os.getcwd())
            self.ref = ref or "master"

        @classmethod
        def _strip_protocol(cls, path):
            path = super()._strip_protocol(path).lstrip("/")
            if ":" in path:
                path = path.split(":", 1)[1]
            if "@" in path:
                path = path.split("@", 1)[1]
            return path.lstrip("/")

        def _path_to_object(self, path, ref):
            comm, ref = self.repo.resolve_refish(ref or self.ref)
            parts = path.split("/")
            tree = comm.tree
            for part in parts:
                if part and isinstance(tree, pygit2.Tree):
                    if part not in tree:
                        raise FileNotFoundError(path)
                    tree = tree[part]
            return tree

        @staticmethod
        def _get_kwargs_from_urls(path):
            path = path.removeprefix("git://")
            out = {}
            if ":" in path:
                out["path"], path = path.split(":", 1)
            if "@" in path:
                out["ref"], path = path.split("@", 1)
            return out

        @staticmethod
        def _object_to_info(obj, path=None):
            # obj.name and obj.filemode are None for the root tree!
            is_dir = isinstance(obj, pygit2.Tree)
            return {
                "type": "directory" if is_dir else "file",
                "name": (
                    "/".join([path, obj.name or ""]).lstrip("/") if path else obj.name
                ),
                "hex": str(obj.id),
                "mode": "100644" if obj.filemode is None else f"{obj.filemode:o}",
                "size": 0 if is_dir else obj.size,
            }

        def ls(self, path, detail=True, ref=None, **kwargs):
            tree = self._path_to_object(self._strip_protocol(path), ref)
            return [
                GitFileSystem._object_to_info(obj, path)
                if detail
                else GitFileSystem._object_to_info(obj, path)["name"]
                for obj in (tree if isinstance(tree, pygit2.Tree) else [tree])
            ]

        def info(self, path, ref=None, **kwargs):
            tree = self._path_to_object(self._strip_protocol(path), ref)
            return GitFileSystem._object_to_info(tree, path)

        def ukey(self, path, ref=None):
            return self.info(path, ref=ref)["hex"]

        def _open(
            self,
            path,
            mode="rb",
            block_size=None,
            autocommit=True,
            cache_options=None,
            ref=None,
            **kwargs,
        ):
            obj = self._path_to_object(path, ref or self.ref)
            return MemoryFile(data=obj.data)