From 7729d3e9c768e94ebec96c4831dd91414d430518 Mon Sep 17 00:00:00 2001
From: Sanchayan Maity <maitysanchayan@gmail.com>
Date: Thu, 15 Oct 2020 15:22:18 +0530
Subject: [PATCH] dwm: Hide vacant tags

This patch prevents dwm from drawing tags with no clients (i.e. vacant)
on the bar.

It also makes sure that pressing a tag on the bar behaves accordingly by
not reserving reactive regions on the bar for vacant tags.

It also stops drawing empty rectangles on the bar for non-vacant tags as
there is no need anymore to distinguish vacant tags and it offers a more
visible contrast than if there were filled/empty rectangles.
---
 dwm.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/dwm.c b/dwm.c
index 4fc12c6..6c62ef0 100644
--- a/dwm.c
+++ b/dwm.c
@@ -454,7 +454,7 @@ attachstack(Client *c)
 void
 buttonpress(XEvent *e)
 {
-	unsigned int i, x, click;
+	unsigned int i, x, click, occ = 0;
 	Arg arg = {0};
 	Client *c;
 	Monitor *m;
@@ -469,9 +469,14 @@ buttonpress(XEvent *e)
 	}
 	if (ev->window == selmon->barwin) {
 		i = x = 0;
-		do
+		for (c = m->clients; c; c = c->next)
+			occ |= c->tags == 255 ? 0 : c->tags;
+		do {
+			/* do not reserve space for vacant tags */
+			if (!(occ & 1 << i || m->tagset[m->seltags] & 1 << i))
+				continue;
 			x += TEXTW(tags[i]);
-		while (ev->x >= x && ++i < LENGTH(tags));
+		} while (ev->x >= x && ++i < LENGTH(tags));
 		if (i < LENGTH(tags)) {
 			click = ClkTagBar;
 			arg.ui = 1 << i;
@@ -747,19 +752,19 @@ drawbar(Monitor *m)
 	}
 
 	for (c = m->clients; c; c = c->next) {
-		occ |= c->tags;
+		occ |= c->tags == 255 ? 0 : c->tags;
 		if (c->isurgent)
 			urg |= c->tags;
 	}
 	x = 0;
 	for (i = 0; i < LENGTH(tags); i++) {
+		/* do not draw vacant tags */
+		if (!(occ & 1 << i || m->tagset[m->seltags] & 1 << i))
+		continue;
+
 		w = TEXTW(tags[i]);
 		drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
 		drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
-		if (occ & 1 << i)
-			drw_rect(drw, x + boxs, boxs, boxw, boxw,
-				m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
-				urg & 1 << i);
 		x += w;
 	}
 	w = blw = TEXTW(m->ltsymbol);