Add a function that adds an entry to a menuq, normalizing a common code

path; from Tiago Cunha.

menu.c

@@ -25,6 +25,7 @@
 #include <ctype.h>
 #include <err.h>
 #include <errno.h>
+#include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -604,6 +605,22 @@ menu_keycode(XKeyEvent *ev, enum ctltype *ctl, char *chr)
 	return (0);
 }
 
+void
+menuq_add(struct menu_q *mq, void *ctx, const char *fmt, ...)
+{
+	va_list		 ap;
+	struct menu	*mi;
+
+	mi = xcalloc(1, sizeof(*mi));
+	mi->ctx = ctx;
+
+	va_start(ap, fmt);
+	(void)vsnprintf(mi->text, sizeof(mi->text), fmt, ap);
+	va_end(ap);
+
+	TAILQ_INSERT_TAIL(mq, mi, entry);
+}
+
 void
 menuq_clear(struct menu_q *mq)
 {