checkout: consolidate reset_{to_new,clean_to_new}()

These two were very similar functions with only tiny bit of difference.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-checkout.c

@@ -151,39 +151,29 @@ static void describe_detached_head(char *msg, struct commit *commit)
 	strbuf_release(&sb);
 }
 
-static int reset_to_new(struct tree *tree, int quiet)
-{
-	struct unpack_trees_options opts;
-	struct tree_desc tree_desc;
+struct checkout_opts {
+	int quiet;
+	int merge;
+	int force;
 
-	memset(&opts, 0, sizeof(opts));
-	opts.head_idx = -1;
-	opts.update = 1;
-	opts.reset = 1;
-	opts.merge = 1;
-	opts.fn = oneway_merge;
-	opts.verbose_update = !quiet;
-	opts.src_index = &the_index;
-	opts.dst_index = &the_index;
-	parse_tree(tree);
-	init_tree_desc(&tree_desc, tree->buffer, tree->size);
-	if (unpack_trees(1, &tree_desc, &opts))
-		return 128;
-	return 0;
-}
+	char *new_branch;
+	int new_branch_log;
+	enum branch_track track;
+};
 
-static int reset_clean_to_new(struct tree *tree, int quiet)
+static int reset_tree(struct tree *tree, struct checkout_opts *o, int worktree)
 {
 	struct unpack_trees_options opts;
 	struct tree_desc tree_desc;
 
 	memset(&opts, 0, sizeof(opts));
 	opts.head_idx = -1;
-	opts.skip_unmerged = 1;
+	opts.update = worktree;
+	opts.skip_unmerged = !worktree;
 	opts.reset = 1;
 	opts.merge = 1;
 	opts.fn = oneway_merge;
-	opts.verbose_update = !quiet;
+	opts.verbose_update = !o->quiet;
 	opts.src_index = &the_index;
 	opts.dst_index = &the_index;
 	parse_tree(tree);
@@ -193,16 +183,6 @@ static int reset_clean_to_new(struct tree *tree, int quiet)
 	return 0;
 }
 
-struct checkout_opts {
-	int quiet;
-	int merge;
-	int force;
-
-	char *new_branch;
-	int new_branch_log;
-	enum branch_track track;
-};
-
 struct branch_info {
 	const char *name; /* The short name used */
 	const char *path; /* The full name of a real branch */
@@ -227,7 +207,7 @@ static int merge_working_tree(struct checkout_opts *opts,
 	read_cache();
 
 	if (opts->force) {
-		ret = reset_to_new(new->commit->tree, opts->quiet);
+		ret = reset_tree(new->commit->tree, opts, 1);
 		if (ret)
 			return ret;
 	} else {
@@ -291,12 +271,12 @@ static int merge_working_tree(struct checkout_opts *opts,
 			add_files_to_cache(NULL, NULL, 0);
 			work = write_tree_from_memory();
 
-			ret = reset_to_new(new->commit->tree, opts->quiet);
+			ret = reset_tree(new->commit->tree, opts, 1);
 			if (ret)
 				return ret;
 			merge_trees(new->commit->tree, work, old->commit->tree,
 				    new->name, "local", &result);
-			ret = reset_clean_to_new(new->commit->tree, opts->quiet);
+			ret = reset_tree(new->commit->tree, opts, 0);
 			if (ret)
 				return ret;
 		}