Add git-for-each-ref: helper for language bindings

This adds a new command, git-for-each-ref.  You can have it iterate
over refs and have it output various aspects of the objects they
refer to.

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 41 insertions, 27 deletions

diff --git a/object.c b/object.c
index 92813001e2..de244e2063 100644
--- a/object.c
+++ b/object.c
@@ -138,42 +138,56 @@ struct object *lookup_unknown_object(const unsigned char *sha1)
 	return obj;
 }
 
+struct object *parse_object_buffer(const unsigned char *sha1, const char *type, unsigned long size, void *buffer, int *eaten_p)
+{
+	struct object *obj;
+	int eaten = 0;
+
+	if (!strcmp(type, blob_type)) {
+		struct blob *blob = lookup_blob(sha1);
+		parse_blob_buffer(blob, buffer, size);
+		obj = &blob->object;
+	} else if (!strcmp(type, tree_type)) {
+		struct tree *tree = lookup_tree(sha1);
+		obj = &tree->object;
+		if (!tree->object.parsed) {
+			parse_tree_buffer(tree, buffer, size);
+			eaten = 1;
+		}
+	} else if (!strcmp(type, commit_type)) {
+		struct commit *commit = lookup_commit(sha1);
+		parse_commit_buffer(commit, buffer, size);
+		if (!commit->buffer) {
+			commit->buffer = buffer;
+			eaten = 1;
+		}
+		obj = &commit->object;
+	} else if (!strcmp(type, tag_type)) {
+		struct tag *tag = lookup_tag(sha1);
+		parse_tag_buffer(tag, buffer, size);
+		obj = &tag->object;
+	} else {
+		obj = NULL;
+	}
+	*eaten_p = eaten;
+	return obj;
+}
+
 struct object *parse_object(const unsigned char *sha1)
 {
 	unsigned long size;
 	char type[20];
+	int eaten;
 	void *buffer = read_sha1_file(sha1, type, &size);
+
 	if (buffer) {
 		struct object *obj;
 		if (check_sha1_signature(sha1, buffer, size, type) < 0)
 			printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
-		if (!strcmp(type, blob_type)) {
-			struct blob *blob = lookup_blob(sha1);
-			parse_blob_buffer(blob, buffer, size);
-			obj = &blob->object;
-		} else if (!strcmp(type, tree_type)) {
-			struct tree *tree = lookup_tree(sha1);
-			obj = &tree->object;
-			if (!tree->object.parsed) {
-				parse_tree_buffer(tree, buffer, size);
-				buffer = NULL;
-			}
-		} else if (!strcmp(type, commit_type)) {
-			struct commit *commit = lookup_commit(sha1);
-			parse_commit_buffer(commit, buffer, size);
-			if (!commit->buffer) {
-				commit->buffer = buffer;
-				buffer = NULL;
-			}
-			obj = &commit->object;
-		} else if (!strcmp(type, tag_type)) {
-			struct tag *tag = lookup_tag(sha1);
-			parse_tag_buffer(tag, buffer, size);
-			obj = &tag->object;
-		} else {
-			obj = NULL;
-		}
-		free(buffer);
+
+		obj = parse_object_buffer(sha1, type, size, buffer, &eaten);
+		if (!eaten)
+			free(buffer);
 		return obj;
 	}
 	return NULL;