Add support for the iTerm2 DSR 1337 sequence to get the terminal version.

input.c

@@ -20,6 +20,7 @@
 
 #include <netinet/in.h>
 
+#include <ctype.h>
 #include <resolv.h>
 #include <stdlib.h>
 #include <string.h>
@@ -1301,6 +1302,7 @@ input_csi_dispatch(struct input_ctx *ictx)
 	struct input_table_entry       *entry;
 	int				i, n, m;
 	u_int				cx, bg = ictx->cell.cell.bg;
+	char			       *copy, *cp;
 
 	if (ictx->flags & INPUT_DISCARD)
 		return (0);
@@ -1432,6 +1434,13 @@ input_csi_dispatch(struct input_ctx *ictx)
 		case 6:
 			input_reply(ictx, "\033[%u;%uR", s->cy + 1, s->cx + 1);
 			break;
+		case 1337: /* Terminal version, from iTerm2. */
+			copy = xstrdup(getversion());
+			for (cp = copy; *cp != '\0'; cp++)
+				*cp = toupper((u_char)*cp);
+			input_reply(ictx, "\033[TMUX %sn", copy);
+			free(copy);
+			break;
 		default:
 			log_debug("%s: unknown '%c'", __func__, ictx->ch);
 			break;

tty-keys.c

@@ -1099,7 +1099,7 @@ tty_keys_device_status_report(struct tty *tty, const char *buf, size_t len,
 		return (-1);
 	if (len == 2)
 		return (1);
-	if (buf[2] != 'I')
+	if (buf[2] != 'I' && buf[2] != 'T')
 		return (-1);
 	if (len == 3)
 		return (1);