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-tree walking API
-================
-
-The tree walking API is used to traverse and inspect trees.
-
-Data Structures
----------------
-
-`struct name_entry`::
-
-	An entry in a tree. Each entry has a sha1 identifier, pathname, and
-	mode.
-
-`struct tree_desc`::
-
-	A semi-opaque data structure used to maintain the current state of the
-	walk.
-+
-* `buffer` is a pointer into the memory representation of the tree. It always
-points at the current entry being visited.
-
-* `size` counts the number of bytes left in the `buffer`.
-
-* `entry` points to the current entry being visited.
-
-`struct traverse_info`::
-
-	A structure used to maintain the state of a traversal.
-+
-* `prev` points to the traverse_info which was used to descend into the
-current tree. If this is the top-level tree `prev` will point to
-a dummy traverse_info.
-
-* `name` is the entry for the current tree (if the tree is a subtree).
-
-* `pathlen` is the length of the full path for the current tree.
-
-* `conflicts` can be used by callbacks to maintain directory-file conflicts.
-
-* `fn` is a callback called for each entry in the tree. See Traversing for more
-information.
-
-* `data` can be anything the `fn` callback would want to use.
-
-* `show_all_errors` tells whether to stop at the first error or not.
-
-Initializing
-------------
-
-`init_tree_desc`::
-
-	Initialize a `tree_desc` and decode its first entry. The buffer and
-	size parameters are assumed to be the same as the buffer and size
-	members of `struct tree`.
-
-`fill_tree_descriptor`::
-
-	Initialize a `tree_desc` and decode its first entry given the
-	object ID of a tree. Returns the `buffer` member if the latter
-	is a valid tree identifier and NULL otherwise.
-
-`setup_traverse_info`::
-
-	Initialize a `traverse_info` given the pathname of the tree to start
-	traversing from. The `base` argument is assumed to be the `path`
-	member of the `name_entry` being recursed into unless the tree is a
-	top-level tree in which case the empty string ("") is used.
-
-Walking
--------
-
-`tree_entry`::
-
-	Visit the next entry in a tree. Returns 1 when there are more entries
-	left to visit and 0 when all entries have been visited. This is
-	commonly used in the test of a while loop.
-
-`tree_entry_len`::
-
-	Calculate the length of a tree entry's pathname. This utilizes the
-	memory structure of a tree entry to avoid the overhead of using a
-	generic strlen().
-
-`update_tree_entry`::
-
-	Walk to the next entry in a tree. This is commonly used in conjunction
-	with `tree_entry_extract` to inspect the current entry.
-
-`tree_entry_extract`::
-
-	Decode the entry currently being visited (the one pointed to by
-	`tree_desc's` `entry` member) and return the sha1 of the entry. The
-	`pathp` and `modep` arguments are set to the entry's pathname and mode
-	respectively.
-
-`get_tree_entry`::
-
-	Find an entry in a tree given a pathname and the sha1 of a tree to
-	search. Returns 0 if the entry is found and -1 otherwise. The third
-	and fourth parameters are set to the entry's sha1 and mode
-	respectively.
-
-Traversing
-----------
-
-`traverse_trees`::
-
-	Traverse `n` number of trees in parallel. The `fn` callback member of
-	`traverse_info` is called once for each tree entry.
-
-`traverse_callback_t`::
-	The arguments passed to the traverse callback are as follows:
-+
-* `n` counts the number of trees being traversed.
-
-* `mask` has its nth bit set if something exists in the nth entry.
-
-* `dirmask` has its nth bit set if the nth tree's entry is a directory.
-
-* `entry` is an array of size `n` where the nth entry is from the nth tree.
-
-* `info` maintains the state of the traversal.
-
-+
-Returning a negative value will terminate the traversal. Otherwise the
-return value is treated as an update mask. If the nth bit is set the nth tree
-will be updated and if the bit is not set the nth tree entry will be the
-same in the next callback invocation.
-
-`make_traverse_path`::
-
-	Generate the full pathname of a tree entry based from the root of the
-	traversal. For example, if the traversal has recursed into another
-	tree named "bar" the pathname of an entry "baz" in the "bar"
-	tree would be "bar/baz".
-
-`traverse_path_len`::
-
-	Calculate the length of a pathname returned by `make_traverse_path`.
-	This utilizes the memory structure of a tree entry to avoid the
-	overhead of using a generic strlen().
-
-Authors
--------
-
-Written by Junio C Hamano <gitster@pobox.com> and Linus Torvalds
-<torvalds@linux-foundation.org>