thodg/libgit2/src/tree.h
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Hash : 58206c9a
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Date : 2013-05-16T10:38:27
Add cat-file example and increase const use in API This adds an example implementation that emulates git cat-file. It is a convenient and relatively simple example of getting data out of a repository. Implementing this also revealed that there are a number of APIs that are still not using const pointers to objects that really ought to be. The main cause of this is that `git_vector_bsearch` may need to call `git_vector_sort` before doing the search, so a const pointer to the vector is not allowed. However, for tree objects, with a little care, we can ensure that the vector of tree entries is always sorted and allow lookups to take a const pointer. Also, the missing const in commit objects just looks like an oversight.
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src/tree.h
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/* * Copyright (C) the libgit2 contributors. All rights reserved. * * This file is part of libgit2, distributed under the GNU GPL v2 with * a Linking Exception. For full terms see the included COPYING file. */ #ifndef INCLUDE_tree_h__ #define INCLUDE_tree_h__ #include "git2/tree.h" #include "repository.h" #include "odb.h" #include "vector.h" struct git_tree_entry { uint16_t removed; uint16_t attr; git_oid oid; size_t filename_len; char filename[1]; }; struct git_tree { git_object object; git_vector entries; }; struct git_treebuilder { git_vector entries; size_t entrycount; /* vector may contain "removed" entries */ }; GIT_INLINE(bool) git_tree_entry__is_tree(const struct git_tree_entry *e) { return (S_ISDIR(e->attr) && !S_ISGITLINK(e->attr)); } extern int git_tree_entry_icmp(const git_tree_entry *e1, const git_tree_entry *e2); void git_tree__free(void *tree); int git_tree__parse(void *tree, git_odb_object *obj); /** * Lookup the first position in the tree with a given prefix. * * @param tree a previously loaded tree. * @param prefix the beginning of a path to find in the tree. * @return index of the first item at or after the given prefix. */ int git_tree__prefix_position(const git_tree *tree, const char *prefix); /** * Write a tree to the given repository */ int git_tree__write_index( git_oid *oid, git_index *index, git_repository *repo); /** * Obsolete mode kept for compatibility reasons */ #define GIT_FILEMODE_BLOB_GROUP_WRITABLE 0100664 #endif