Allow menu items to be disabled by putting a - at the start of their

name, rather than just including #[dim] which still allowed them to be
chosen.

key-bindings.c

@@ -299,7 +299,7 @@ key_bindings_init(void)
 		"bind -n MouseDown3Status display-menu -t= -xW -yS -T \"#[align=centre]#{window_index}:#{window_name}\""
 			" 'Swap Left' 'l' {swap-window -t:-1}"
 			" 'Swap Right' 'r' {swap-window -t:+1}"
-			" '#{?pane_marked_set,,#[dim]}Swap Marked' 's' {swap-window}"
+			" '#{?pane_marked_set,,-}Swap Marked' 's' {swap-window}"
 			" ''"
 			" 'Kill' 'X' {kill-window}"
 			" 'Respawn' 'R' {respawn-window -k}"
@@ -319,7 +319,7 @@ key_bindings_init(void)
 			" ''"
 			" 'Swap Up' 'u' {swap-pane -U}"
 			" 'Swap Down' 'd' {swap-pane -D}"
-			" '#{?pane_marked_set,,#[dim]}Swap Marked' 's' {swap-pane}"
+			" '#{?pane_marked_set,,-}Swap Marked' 's' {swap-pane}"
 			" ''"
 			" 'Kill' 'X' {kill-pane}"
 			" 'Respawn' 'R' {respawn-pane -k}"

menu.c

@@ -80,7 +80,7 @@ menu_add_item(struct menu *menu, const struct menu_item *item,
 		menu->count--;
 		return;
 	}
-	if (item->key != KEYC_UNKNOWN && item->key != KEYC_NONE) {
+	if (*s != '-' && item->key != KEYC_UNKNOWN && item->key != KEYC_NONE) {
 		key = key_string_lookup_key(item->key);
 		xasprintf(&name, "%s#[default] #[align=right](%s)", s, key);
 	} else
@@ -182,6 +182,7 @@ menu_key_cb(struct client *c, struct key_event *event)
 	const struct menu_item		*item;
 	struct cmdq_item		*new_item;
 	struct cmd_parse_result		*pr;
+	const char			*name;
 
 	if (KEYC_IS_MOUSE(event->key)) {
 		if (md->flags & MENU_NOMOUSE)
@@ -207,21 +208,27 @@ menu_key_cb(struct client *c, struct key_event *event)
 	}
 	switch (event->key) {
 	case KEYC_UP:
+		if (old == -1)
+			old = 0;
 		do {
 			if (md->choice == -1 || md->choice == 0)
 				md->choice = count - 1;
 			else
 				md->choice--;
-		} while (menu->items[md->choice].name == NULL);
+			name = menu->items[md->choice].name;
+		} while ((name == NULL || *name == '-') && md->choice != old);
 		c->flags |= CLIENT_REDRAWOVERLAY;
 		return (0);
 	case KEYC_DOWN:
+		if (old == -1)
+			old = 0;
 		do {
 			if (md->choice == -1 || md->choice == count - 1)
 				md->choice = 0;
 			else
 				md->choice++;
-		} while (menu->items[md->choice].name == NULL);
+			name = menu->items[md->choice].name;
+		} while ((name == NULL || *name == '-') && md->choice != old);
 		c->flags |= CLIENT_REDRAWOVERLAY;
 		return (0);
 	case '\r':
@@ -233,6 +240,9 @@ menu_key_cb(struct client *c, struct key_event *event)
 		return (1);
 	}
 	for (i = 0; i < (u_int)count; i++) {
+		name = menu->items[i].name;
+		if (name == NULL || *name == '-')
+			continue;
 		if (event->key == menu->items[i].key) {
 			md->choice = i;
 			goto chosen;
@@ -244,7 +254,7 @@ chosen:
 	if (md->choice == -1)
 		return (1);
 	item = &menu->items[md->choice];
-	if (item->name == NULL)
+	if (item->name == NULL || *item->name == '-')
 		return (1);
 	if (md->cb != NULL) {
 	    md->cb(md->menu, md->choice, item->key, md->data);

screen-write.c

@@ -410,6 +410,7 @@ screen_write_menu(struct screen_write_ctx *ctx, struct menu *menu, int choice)
 	struct screen		*s = ctx->s;
 	struct grid_cell	 gc;
 	u_int			 cx, cy, i, j;
+	const char		*name;
 
 	cx = s->cx;
 	cy = s->cy;
@@ -421,18 +422,24 @@ screen_write_menu(struct screen_write_ctx *ctx, struct menu *menu, int choice)
 	format_draw(ctx, &gc, menu->width, menu->title, NULL);
 
 	for (i = 0; i < menu->count; i++) {
-		if (menu->items[i].name == NULL) {
+		name = menu->items[i].name;
+		if (name == NULL) {
 			screen_write_cursormove(ctx, cx, cy + 1 + i, 0);
 			screen_write_hline(ctx, menu->width + 4, 1, 1);
 		} else {
-			if (choice >= 0 && i == (u_int)choice)
+			if (choice >= 0 && i == (u_int)choice && *name != '-')
 				gc.attr |= GRID_ATTR_REVERSE;
 			screen_write_cursormove(ctx, cx + 2, cy + 1 + i, 0);
 			for (j = 0; j < menu->width; j++)
 				screen_write_putc(ctx, &gc, ' ');
 			screen_write_cursormove(ctx, cx + 2, cy + 1 + i, 0);
-			format_draw(ctx, &gc, menu->width, menu->items[i].name,
+			if (*name == '-') {
-			    NULL);
+				name++;
+				gc.attr |= GRID_ATTR_DIM;
+				format_draw(ctx, &gc, menu->width, name, NULL);
+				gc.attr &= ~GRID_ATTR_DIM;
+			} else
+				format_draw(ctx, &gc, menu->width, name, NULL);
 			if (choice >= 0 && i == (u_int)choice)
 				gc.attr &= ~GRID_ATTR_REVERSE;
 		}

tmux.1

@@ -4674,6 +4674,8 @@ The name and command are formats, see the
 and
 .Sx STYLES
 sections.
+If the name begins with a hyphen (-), then the item is disabled (shown dim) and
+may not be chosen.
 The name may be empty for a separator line, in which case both the key and
 command should be omitted.
 .Pp