Add an "Any" key to run a command if a key is pressed that is not bound

in the current key table. GitHub issue 1404.

key-string.c

@@ -166,9 +166,11 @@ key_string_lookup_string(const char *string)
 	enum utf8_state		 more;
 	wchar_t			 wc;
 
-	/* Is this no key? */
+	/* Is this no key or any key? */
 	if (strcasecmp(string, "None") == 0)
 		return (KEYC_NONE);
+	if (strcasecmp(string, "Any") == 0)
+		return (KEYC_ANY);
 
 	/* Is this a hexadecimal value? */
 	if (string[0] == '0' && string[1] == 'x') {
@@ -251,6 +253,8 @@ key_string_lookup_key(key_code key)
 	/* Handle special keys. */
 	if (key == KEYC_UNKNOWN)
 		return ("Unknown");
+	if (key == KEYC_ANY)
+		return ("Any");
 	if (key == KEYC_FOCUS_IN)
 		return ("FocusIn");
 	if (key == KEYC_FOCUS_OUT)

server-client.c

@@ -907,8 +907,8 @@ server_client_handle_key(struct client *c, key_code key)
 	 * The prefix always takes precedence and forces a switch to the prefix
 	 * table, unless we are already there.
 	 */
-retry:
 	key0 = (key & ~KEYC_XTERM);
+retry:
 	if ((key0 == (key_code)options_get_number(s->options, "prefix") ||
 	    key0 == (key_code)options_get_number(s->options, "prefix2")) &&
 	    strcmp(table->name, "prefix") != 0) {
@@ -980,6 +980,10 @@ retry:
 	 * switch the client back to the root table and try again.
 	 */
 	log_debug("not found in key table %s", table->name);
+	if (key0 != KEYC_ANY) {
+		key0 = KEYC_ANY;
+		goto retry;
+	}
 	if (!server_client_is_default_key_table(c, table) ||
 	    (c->flags & CLIENT_REPEAT)) {
 		server_client_set_key_table(c, NULL);

tmux.h

@@ -136,6 +136,9 @@ enum {
 	KEYC_FOCUS_IN = KEYC_BASE,
 	KEYC_FOCUS_OUT,
 
+	/* "Any" key, used if not found in key table. */
+	KEYC_ANY,
+
 	/* Paste brackets. */
 	KEYC_PASTE_START,
 	KEYC_PASTE_END,