rebase--interactive: move rearrange_squash_in_todo_file()

As rearrange_squash_in_todo_file() is only needed inside of
rebase--interactive.c for `rebase -p', it is moved there from
sequencer.c.

The parameter r (repository) is dropped along the way, and the error
handling is slightly improved.

Signed-off-by: Alban Gruin <alban.gruin@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/rebase--interactive.c

@@ -38,6 +38,32 @@ static int add_exec_commands(struct string_list *commands)
 	return 0;
 }
 
+static int rearrange_squash_in_todo_file(void)
+{
+	const char *todo_file = rebase_path_todo();
+	struct todo_list todo_list = TODO_LIST_INIT;
+	int res = 0;
+
+	if (strbuf_read_file(&todo_list.buf, todo_file, 0) < 0)
+		return error_errno(_("could not read '%s'."), todo_file);
+	if (todo_list_parse_insn_buffer(the_repository, todo_list.buf.buf,
+					&todo_list)) {
+		todo_list_release(&todo_list);
+		return error(_("unusable todo list: '%s'"), todo_file);
+	}
+
+	res = todo_list_rearrange_squash(&todo_list);
+	if (!res)
+		res = todo_list_write_to_file(the_repository, &todo_list,
+					      todo_file, NULL, NULL, -1, 0);
+
+	todo_list_release(&todo_list);
+
+	if (res)
+		return error_errno(_("could not write '%s'."), todo_file);
+	return 0;
+}
+
 static int get_revision_ranges(const char *upstream, const char *onto,
 			       const char **head_hash,
 			       char **revisions, char **shortrevisions)
@@ -288,7 +314,7 @@ int cmd_rebase__interactive(int argc, const char **argv, const char *prefix)
 		ret = check_todo_list_from_file(the_repository);
 		break;
 	case REARRANGE_SQUASH:
-		ret = rearrange_squash_in_todo_file(the_repository);
+		ret = rearrange_squash_in_todo_file();
 		break;
 	case ADD_EXEC:
 		ret = add_exec_commands(&commands);

sequencer.c

@@ -4793,8 +4793,6 @@ static int skip_unnecessary_picks(struct repository *r, struct object_id *output
 	return 0;
 }
 
-static int todo_list_rearrange_squash(struct todo_list *todo_list);
-
 int complete_action(struct repository *r, struct replay_opts *opts, unsigned flags,
 		    const char *shortrevisions, const char *onto_name,
 		    const char *onto, const char *orig_head, struct string_list *commands,
@@ -4906,7 +4904,7 @@ define_commit_slab(commit_todo_item, struct todo_item *);
  * message will have to be retrieved from the commit (as the oneline in the
  * script cannot be trusted) in order to normalize the autosquash arrangement.
  */
-static int todo_list_rearrange_squash(struct todo_list *todo_list)
+int todo_list_rearrange_squash(struct todo_list *todo_list)
 {
 	struct hashmap subject2item;
 	int rearranged = 0, *next, *tail, i, nr = 0, alloc = 0;
@@ -5044,27 +5042,3 @@ static int todo_list_rearrange_squash(struct todo_list *todo_list)
 
 	return 0;
 }
-
-int rearrange_squash_in_todo_file(struct repository *r)
-{
-	const char *todo_file = rebase_path_todo();
-	struct todo_list todo_list = TODO_LIST_INIT;
-	int res = 0;
-
-	if (strbuf_read_file_or_whine(&todo_list.buf, todo_file) < 0)
-		return -1;
-	if (todo_list_parse_insn_buffer(r, todo_list.buf.buf, &todo_list) < 0) {
-		todo_list_release(&todo_list);
-		return -1;
-	}
-
-	res = todo_list_rearrange_squash(&todo_list);
-	if (!res)
-		res = todo_list_write_to_file(r, &todo_list, todo_file, NULL, NULL, -1, 0);
-
-	todo_list_release(&todo_list);
-
-	if (res)
-		return error_errno(_("could not write '%s'."), todo_file);
-	return 0;
-}

sequencer.h

@@ -153,7 +153,7 @@ int complete_action(struct repository *r, struct replay_opts *opts, unsigned fla
 		    const char *shortrevisions, const char *onto_name,
 		    const char *onto, const char *orig_head, struct string_list *commands,
 		    unsigned autosquash, struct todo_list *todo_list);
-int rearrange_squash_in_todo_file(struct repository *r);
+int todo_list_rearrange_squash(struct todo_list *todo_list);
 
 extern const char sign_off_header[];