Add a way to create an empty arguments set.

arguments.c

@@ -64,6 +64,17 @@ args_find(struct args *args, u_char flag)
 	return (RB_FIND(args_tree, &args->tree, &entry));
 }
 
+/* Create an empty arguments set. */
+struct args *
+args_create(void)
+{
+	struct args	 *args;
+
+	args = xcalloc(1, sizeof *args);
+	RB_INIT(&args->tree);
+	return (args);
+}
+
 /* Parse an argv and argc into a new argument set. */
 struct args *
 args_parse(const char *template, int argc, char **argv)
@@ -71,12 +82,11 @@ args_parse(const char *template, int argc, char **argv)
 	struct args	*args;
 	int		 opt;
 
-	args = xcalloc(1, sizeof *args);
-
 	optreset = 1;
 	optind = 1;
 	optarg = NULL;
 
+	args = args_create();
 	while ((opt = getopt(argc, argv, template)) != -1) {
 		if (opt < 0)
 			continue;

cmd-find-window.c

@@ -48,7 +48,7 @@ cmd_find_window_exec(struct cmd *self, struct cmdq_item *item)
 	struct cmd_find_state	*target = cmdq_get_target(item);
 	struct window_pane	*wp = target->wp;
 	const char		*s = args->argv[0], *suffix = "";
-	char			*filter, *argv = { NULL };
+	char			*filter;
 	int			 C, N, T;
 
 	C = args_has(args, 'C');
@@ -91,7 +91,7 @@ cmd_find_window_exec(struct cmd *self, struct cmdq_item *item)
 	else
 		xasprintf(&filter, "#{m%s:*%s*,#{pane_title}}", suffix, s);
 
-	new_args = args_parse("", 1, &argv);
+	new_args = args_create();
 	if (args_has(args, 'Z'))
 		args_set(new_args, 'Z', NULL);
 	args_set(new_args, 'f', filter);

tmux.h

@@ -2182,6 +2182,7 @@ int		tty_keys_next(struct tty *);
 
 /* arguments.c */
 void		 args_set(struct args *, u_char, const char *);
+struct args 	*args_create(void);
 struct args	*args_parse(const char *, int, char **);
 void		 args_free(struct args *);
 char		*args_print(struct args *);