From 4d1af20317cca556c7c993040199c5eac955c9c1 Mon Sep 17 00:00:00 2001
From: nicm <nicm@openbsd.org>
Date: Mon, 5 Feb 2018 06:51:41 +0000
Subject: [PATCH] Show if filter is active/no matches in modes.

---
 usr.bin/tmux/mode-tree.c | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/usr.bin/tmux/mode-tree.c b/usr.bin/tmux/mode-tree.c
index e3982622e80..af736324486 100644
--- a/usr.bin/tmux/mode-tree.c
+++ b/usr.bin/tmux/mode-tree.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: mode-tree.c,v 1.20 2017/11/03 17:11:20 nicm Exp $ */
+/* $OpenBSD: mode-tree.c,v 1.21 2018/02/05 06:51:41 nicm Exp $ */
 
 /*
  * Copyright (c) 2017 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -62,6 +62,7 @@ struct mode_tree_data {
 	int			  preview;
 	char			 *search;
 	char			 *filter;
+	int			  no_matches;
 };
 
 struct mode_tree_item {
@@ -357,7 +358,8 @@ mode_tree_build(struct mode_tree_data *mtd)
 	TAILQ_INIT(&mtd->children);
 
 	mtd->buildcb(mtd->modedata, mtd->sort_type, &tag, mtd->filter);
-	if (TAILQ_EMPTY(&mtd->children))
+	mtd->no_matches = TAILQ_EMPTY(&mtd->children);
+	if (mtd->no_matches)
 		mtd->buildcb(mtd->modedata, mtd->sort_type, &tag, NULL);
 
 	mode_tree_free_items(&mtd->saved);
@@ -479,7 +481,7 @@ mode_tree_draw(struct mode_tree_data *mtd)
 	u_int			 w, h, i, j, sy, box_x, box_y;
 	char			*text, *start, key[7];
 	const char		*tag, *symbol;
-	size_t			 size;
+	size_t			 size, n;
 	int			 keylen;
 
 	if (mtd->line_size == 0)
@@ -587,11 +589,24 @@ mode_tree_draw(struct mode_tree_data *mtd)
 	screen_write_cursormove(&ctx, 0, h);
 	screen_write_box(&ctx, w, sy - h);
 
-	xasprintf(&text, " %s (sort: %s) ", mti->name,
+	xasprintf(&text, " %s (sort: %s)", mti->name,
 	    mtd->sort_list[mtd->sort_type]);
 	if (w - 2 >= strlen(text)) {
 		screen_write_cursormove(&ctx, 1, h);
 		screen_write_puts(&ctx, &gc0, "%s", text);
+
+		if (mtd->no_matches)
+			n = (sizeof "no matches") - 1;
+		else
+			n = (sizeof "active") - 1;
+		if (mtd->filter != NULL && w - 2 >= strlen(text) + 10 + n + 2) {
+			screen_write_puts(&ctx, &gc0, " (filter: ");
+			if (mtd->no_matches)
+				screen_write_puts(&ctx, &gc, "no matches");
+			else
+				screen_write_puts(&ctx, &gc0, "active");
+			screen_write_puts(&ctx, &gc0, ") ");
+		}
 	}
 	free(text);
 
-- 
2.20.1