Add git_tree_cache_get

Signed-off-by: Carlos Martín Nieto <cmn@elego.de>

src/tree-cache.c

@@ -7,7 +7,7 @@
 
 #include "tree-cache.h"
 
-static git_tree_cache *find_child(git_tree_cache *tree, const char *path)
+static git_tree_cache *find_child(const git_tree_cache *tree, const char *path)
 {
 	size_t i, dirlen;
 	const char *end;
@@ -53,6 +53,29 @@ void git_tree_cache_invalidate_path(git_tree_cache *tree, const char *path)
 	}
 }
 
+const git_tree_cache *git_tree_cache_get(const git_tree_cache *tree, const char *path)
+{
+	const char *ptr = path, *end;
+
+	if (tree == NULL) {
+		return NULL;
+	}
+
+	while (1) {
+		end = strchr(ptr, '/');
+
+		tree = find_child(tree, ptr);
+		if (tree == NULL) { /* Can't find it */
+			return NULL;
+		}
+
+		if (end == NULL || end + 1 == '\0')
+			return tree;
+
+		ptr = end + 1;
+	}
+}
+
 static int read_tree_internal(git_tree_cache **out,
 		const char **buffer_in, const char *buffer_end, git_tree_cache *parent)
 {

src/tree-cache.h

@@ -25,6 +25,7 @@ typedef struct git_tree_cache git_tree_cache;
 
 int git_tree_cache_read(git_tree_cache **tree, const char *buffer, size_t buffer_size);
 void git_tree_cache_invalidate_path(git_tree_cache *tree, const char *path);
+const git_tree_cache *git_tree_cache_get(const git_tree_cache *tree, const char *path);
 void git_tree_cache_free(git_tree_cache *tree);
 
 #endif