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-ref iteration API
-=================
-
-
-Iteration of refs is done by using an iterate function which will call a
-callback function for every ref. The callback function has this
-signature:
-
-	int handle_one_ref(const char *refname, const struct object_id *oid,
-			   int flags, void *cb_data);
-
-There are different kinds of iterate functions which all take a
-callback of this type. The callback is then called for each found ref
-until the callback returns nonzero. The returned value is then also
-returned by the iterate function.
-
-Iteration functions
--------------------
-
-* `head_ref()` just iterates the head ref.
-
-* `for_each_ref()` iterates all refs.
-
-* `for_each_ref_in()` iterates all refs which have a defined prefix and
-  strips that prefix from the passed variable refname.
-
-* `for_each_tag_ref()`, `for_each_branch_ref()`, `for_each_remote_ref()`,
-  `for_each_replace_ref()` iterate refs from the respective area.
-
-* `for_each_glob_ref()` iterates all refs that match the specified glob
-  pattern.
-
-* `for_each_glob_ref_in()` the previous and `for_each_ref_in()` combined.
-
-* Use `refs_` API for accessing submodules. The submodule ref store could
-  be obtained with `get_submodule_ref_store()`.
-
-* `for_each_rawref()` can be used to learn about broken ref and symref.
-
-* `for_each_reflog()` iterates each reflog file.
-
-Submodules
-----------
-
-If you want to iterate the refs of a submodule you first need to add the
-submodules object database. You can do this by a code-snippet like
-this:
-
-	const char *path = "path/to/submodule"
-	if (add_submodule_odb(path))
-		die("Error submodule '%s' not populated.", path);
-
-`add_submodule_odb()` will return zero on success. If you
-do not do this you will get an error for each ref that it does not point
-to a valid object.
-
-Note: As a side-effect of this you cannot safely assume that all
-objects you lookup are available in superproject. All submodule objects
-will be available the same way as the superprojects objects.
-
-Example:
---------
-
-----
-static int handle_remote_ref(const char *refname,
-		const unsigned char *sha1, int flags, void *cb_data)
-{
-	struct strbuf *output = cb_data;
-	strbuf_addf(output, "%s\n", refname);
-	return 0;
-}
-
-...
-
-	struct strbuf output = STRBUF_INIT;
-	for_each_remote_ref(handle_remote_ref, &output);
-	printf("%s", output.buf);
-----