From 71c84fd35126ffdaa64bf79b55b0b984476d9a75 Mon Sep 17 00:00:00 2001
From: Niky Kovalski <nikykovalski@gmail.com>
Date: Fri, 11 Sep 2026 17:25:04 -0400
Subject: [PATCH] centeronlywindow

add a rule to center a window in tiled mode when it is the only window
---
 config.def.h | 7 ++++---
 dwm.c        | 7 +++++++
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/config.def.h b/config.def.h
index 81c3fc0..84f36c1 100644
--- a/config.def.h
+++ b/config.def.h
@@ -26,9 +26,10 @@ static const Rule rules[] = {
 	 *	WM_CLASS(STRING) = instance, class
 	 *	WM_NAME(STRING) = title
 	 */
-	/* class      instance    title       tags mask     isfloating   monitor */
-	{ "Gimp",     NULL,       NULL,       0,            1,           -1 },
-	{ "Firefox",  NULL,       NULL,       1 << 8,       0,           -1 },
+	/* class      instance    title       tags mask     isfloating   iscenteredalone   monitor */
+	{ "st",       NULL,       NULL,       0,            1,           1,                -1 },
+	{ "Gimp",     NULL,       NULL,       0,            1,           0,                -1 },
+	{ "Firefox",  NULL,       NULL,       1 << 8,       0,           0,                -1 },
 };
 
 /* layout(s) */
diff --git a/dwm.c b/dwm.c
index ab3a84c..2710c1f 100644
--- a/dwm.c
+++ b/dwm.c
@@ -92,6 +92,7 @@ struct Client {
 	int bw, oldbw;
 	unsigned int tags;
 	int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
+    int iscenteredalone;
 	Client *next;
 	Client *snext;
 	Monitor *mon;
@@ -137,6 +138,7 @@ typedef struct {
 	const char *title;
 	unsigned int tags;
 	int isfloating;
+    int iscenteredalone;
 	int monitor;
 } Rule;
 
@@ -285,6 +287,7 @@ applyrules(Client *c)
 
 	/* rule matching */
 	c->isfloating = 0;
+    c->iscenteredalone = 0;
 	c->tags = 0;
 	XGetClassHint(dpy, c->win, &ch);
 	class    = ch.res_class ? ch.res_class : broken;
@@ -297,6 +300,7 @@ applyrules(Client *c)
 		&& (!r->instance || strstr(instance, r->instance)))
 		{
 			c->isfloating = r->isfloating;
+            c->iscenteredalone = r->iscenteredalone;
 			c->tags |= r->tags;
 			for (m = mons; m && m->num != r->monitor; m = m->next);
 			if (m)
@@ -1710,6 +1714,9 @@ tile(Monitor *m)
 			if (ty + HEIGHT(c) < m->wh)
 				ty += HEIGHT(c);
 		}
+
+    if (n == 1 && (c = nexttiled(m->clients))->iscenteredalone)
+        resizeclient(c, m->mw / 4, m->mh / 4, m->mw / 2, m->mh / 2);
 }
 
 void
-- 
2.55.0