a, b = t1[2], t2[2]

# assert isinstance(a, str) and isinstance(b, str)

len_a, len_b = len(a), len(b)

min_len = min(len_a, len_b)

min_cmp = cmp(a[:min_len], b[:min_len])

if min_cmp:

return min_cmp

cmp: Callable[[TreeCacheTup, TreeCacheTup], int]) -> None:

if len(a) < 2:

return None

mid = len(a) // 2

lefthalf = a[:mid]

righthalf = a[mid:]

merge_sort(lefthalf, cmp)

merge_sort(righthalf, cmp)

i = 0

j = 0

k = 0

while i < len(lefthalf) and j < len(righthalf):

if cmp(lefthalf[i], righthalf[j]) <= 0:

a[k] = lefthalf[i]

i = i + 1

else:

a[k] = righthalf[j]

j = j + 1

k = k + 1

while i < len(lefthalf):

a[k] = lefthalf[i]

i = i + 1

k = k + 1

while j < len(righthalf):

a[k] = righthalf[j]

j = j + 1

"""A utility class providing methods to alter the underlying cache in a list-like fashion.

__slots__ = '_cache'

def __init__(self, cache: List[TreeCacheTup]) -> None:

self._cache = cache

def _index_by_name(self, name: str) -> int:

""":return: index of an item with name, or -1 if not found"""

for i, t in enumerate(self._cache):

if t[2] == name:

return i

# END found item

# END for each item in cache

return -1

#{ Interface

def set_done(self) -> 'TreeModifier':

"""Call this method once you are done modifying the tree information.

merge_sort(self._cache, git_cmp)

return self

#} END interface

#{ Mutators

def add(self, sha: bytes, mode: int, name: str, force: bool = False) -> 'TreeModifier':

"""Add the given item to the tree. If an item with the given name already

if '/' in name:

raise ValueError("Name must not contain '/' characters")

if (mode >> 12) not in Tree._map_id_to_type:

raise ValueError("Invalid object type according to mode %o" % mode)

sha = to_bin_sha(sha)

index = self._index_by_name(name)

item = (sha, mode, name)

# assert is_tree_cache(item)

if index == -1:

self._cache.append(item)

else:

if force:

self._cache[index] = item

else:

ex_item = self._cache[index]

if ex_item[0] != sha or ex_item[1] != mode:

raise ValueError("Item %r existed with different properties" % name)

# END handle mismatch

# END handle force

# END handle name exists

return self

def add_unchecked(self, binsha: bytes, mode: int, name: str) -> None:

"""Add the given item to the tree, its correctness is assumed, which

assert isinstance(binsha, bytes) and isinstance(mode, int) and isinstance(name, str)

tree_cache = (binsha, mode, name)

self._cache.append(tree_cache)

def __delitem__(self, name: str) -> None:

"""Deletes an item with the given name if it exists"""

index = self._index_by_name(name)

if index > -1:

del(self._cache[index])

"""Tree objects represent an ordered list of Blobs and other Trees.

type: Literal['tree'] = "tree"

__slots__ = "_cache"

# actual integer ids for comparison

commit_id = 0o16 # equals stat.S_IFDIR | stat.S_IFLNK - a directory link

blob_id = 0o10

symlink_id = 0o12

tree_id = 0o04

_map_id_to_type: Dict[int, Type[IndexObjUnion]] = {

commit_id: Submodule,

blob_id: Blob,

symlink_id: Blob

# tree id added once Tree is defined

}

def __init__(self, repo: 'Repo', binsha: bytes, mode: int = tree_id << 12, path: Union[PathLike, None] = None):

super(Tree, self).__init__(repo, binsha, mode, path)

@ classmethod

def _get_intermediate_items(cls, index_object: 'Tree',

) -> Union[Tuple['Tree', ...], Tuple[()]]:

if index_object.type == "tree":

return tuple(index_object._iter_convert_to_object(index_object._cache))

return ()

def _set_cache_(self, attr: str) -> None:

if attr == "_cache":

# Set the data when we need it

ostream = self.repo.odb.stream(self.binsha)

self._cache: List[TreeCacheTup] = tree_entries_from_data(ostream.read())

else:

super(Tree, self)._set_cache_(attr)

# END handle attribute

def _iter_convert_to_object(self, iterable: Iterable[TreeCacheTup]

) -> Iterator[IndexObjUnion]:

"""Iterable yields tuples of (binsha, mode, name), which will be converted

for binsha, mode, name in iterable:

path = join_path(self.path, name)

try:

yield self._map_id_to_type[mode >> 12](self.repo, binsha, mode, path)

except KeyError as e:

raise TypeError("Unknown mode %o found in tree data for path '%s'" % (mode, path)) from e

# END for each item

def join(self, file: str) -> IndexObjUnion:

"""Find the named object in this tree's contents

msg = "Blob or Tree named %r not found"

if '/' in file:

tree = self

item = self

tokens = file.split('/')

for i, token in enumerate(tokens):

item = tree[token]

if item.type == 'tree':

tree = item

else:

# safety assertion - blobs are at the end of the path

if i != len(tokens) - 1:

raise KeyError(msg % file)

return item

# END handle item type

# END for each token of split path

if item == self:

raise KeyError(msg % file)

return item

else:

for info in self._cache:

if info[2] == file: # [2] == name

return self._map_id_to_type[info[1] >> 12](self.repo, info[0], info[1],

join_path(self.path, info[2]))

# END for each obj

raise KeyError(msg % file)

# END handle long paths

def __truediv__(self, file: str) -> IndexObjUnion:

"""For PY3 only"""

return self.join(file)

@ property

def trees(self) -> List['Tree']:

""":return: list(Tree, ...) list of trees directly below this tree"""

return [i for i in self if i.type == "tree"]

@ property

def blobs(self) -> List[Blob]:

""":return: list(Blob, ...) list of blobs directly below this tree"""

return [i for i in self if i.type == "blob"]

@ property

def cache(self) -> TreeModifier:

"""

return TreeModifier(self._cache)

def traverse(self, # type: ignore[override]

predicate: Callable[[Union[IndexObjUnion, TraversedTreeTup], int], bool] = lambda i, d: True,

prune: Callable[[Union[IndexObjUnion, TraversedTreeTup], int], bool] = lambda i, d: False,

depth: int = -1,

branch_first: bool = True,

visit_once: bool = False,

ignore_self: int = 1,

as_edge: bool = False

) -> Union[Iterator[IndexObjUnion],

Iterator[TraversedTreeTup]]:

"""For documentation, see util.Traversable._traverse()

# """

# # To typecheck instead of using cast.

# import itertools

# def is_tree_traversed(inp: Tuple) -> TypeGuard[Tuple[Iterator[Union['Tree', 'Blob', 'Submodule']]]]:

# return all(isinstance(x, (Blob, Tree, Submodule)) for x in inp[1])

# ret = super(Tree, self).traverse(predicate, prune, depth, branch_first, visit_once, ignore_self)

# ret_tup = itertools.tee(ret, 2)

# assert is_tree_traversed(ret_tup), f"Type is {[type(x) for x in list(ret_tup[0])]}"

# return ret_tup[0]"""

return cast(Union[Iterator[IndexObjUnion], Iterator[TraversedTreeTup]],

super(Tree, self)._traverse(predicate, prune, depth, # type: ignore

branch_first, visit_once, ignore_self))

def list_traverse(self, *args: Any, **kwargs: Any) -> IterableList[IndexObjUnion]:

"""

return super(Tree, self)._list_traverse(* args, **kwargs)

# List protocol

def __getslice__(self, i: int, j: int) -> List[IndexObjUnion]:

return list(self._iter_convert_to_object(self._cache[i:j]))

def __iter__(self) -> Iterator[IndexObjUnion]:

return self._iter_convert_to_object(self._cache)

def __len__(self) -> int:

return len(self._cache)

def __getitem__(self, item: Union[str, int, slice]) -> IndexObjUnion:

if isinstance(item, int):

info = self._cache[item]

return self._map_id_to_type[info[1] >> 12](self.repo, info[0], info[1], join_path(self.path, info[2]))

if isinstance(item, str):

# compatibility

return self.join(item)

# END index is basestring

raise TypeError("Invalid index type: %r" % item)

def __contains__(self, item: Union[IndexObjUnion, PathLike]) -> bool:

if isinstance(item, IndexObject):

for info in self._cache:

if item.binsha == info[0]:

return True

# END compare sha

# END for each entry

# END handle item is index object

# compatibility

# treat item as repo-relative path

else:

path = self.path

for info in self._cache:

if item == join_path(path, info[2]):

return True

# END for each item

return False

def __reversed__(self):

return reversed(self._iter_convert_to_object(self._cache))

def _serialize(self, stream: 'BytesIO') -> 'Tree':

"""Serialize this tree into the stream. Please note that we will assume

tree_to_stream(self._cache, stream.write)

return self

def _deserialize(self, stream: 'BytesIO') -> 'Tree':

self._cache = tree_entries_from_data(stream.read())