From d0b1b523a1cf4901aa848e20a9fff59154b3f3c8 Mon Sep 17 00:00:00 2001
From: sesankm <26676400+sesankm@users.noreply.github.com>
Date: Tue, 30 Sep 2025 14:29:08 -0500
Subject: [PATCH] Add gaps when only one window is open

---
 config.def.h |  8 +++++---
 dwm.c        | 33 +++++++++++++++++++++++----------
 2 files changed, 28 insertions(+), 13 deletions(-)

diff --git a/config.def.h b/config.def.h
index 81c3fc0..b6a0b7d 100644
--- a/config.def.h
+++ b/config.def.h
@@ -2,6 +2,8 @@
 
 /* appearance */
 static const unsigned int borderpx  = 1;        /* border pixel of windows */
+static const unsigned int gapx      = 120;      /* horizontal gap */
+static const unsigned int gapy      = 40;       /* vertical gap */
 static const unsigned int snap      = 32;       /* snap pixel */
 static const int showbar            = 1;        /* 0 means no bar */
 static const int topbar             = 1;        /* 0 means bottom bar */
@@ -26,9 +28,9 @@ 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   monitor    disablegap */
+	{ "Gimp",     NULL,       NULL,       0,            1,           -1,        0},
+	{ "Firefox",  NULL,       NULL,       1 << 8,       0,           -1,        1},
 };
 
 /* layout(s) */
diff --git a/dwm.c b/dwm.c
index 4f345ee..1633c38 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 disablegaps;
 	Client *next;
 	Client *snext;
 	Monitor *mon;
@@ -138,6 +139,7 @@ typedef struct {
 	unsigned int tags;
 	int isfloating;
 	int monitor;
+	int disablegaps;
 } Rule;
 
 /* function declarations */
@@ -286,6 +288,7 @@ applyrules(Client *c)
 	/* rule matching */
 	c->isfloating = 0;
 	c->tags = 0;
+	c->disablegaps = 0;
 	XGetClassHint(dpy, c->win, &ch);
 	class    = ch.res_class ? ch.res_class : broken;
 	instance = ch.res_name  ? ch.res_name  : broken;
@@ -302,6 +305,8 @@ applyrules(Client *c)
 			if (m)
 				c->mon = m;
 		}
+        if (strstr(class, r->class) || strstr(instance, r->class))
+            c->disablegaps = r->disablegaps;
 	}
 	if (ch.res_class)
 		XFree(ch.res_class);
@@ -1686,28 +1691,36 @@ tagmon(const Arg *arg)
 void
 tile(Monitor *m)
 {
-	unsigned int i, n, h, mw, my, ty;
+	unsigned int i, n, h, mw, my, ty, ns, gx = 0, gy = 0;
 	Client *c;
 
+
 	for (n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
 	if (n == 0)
 		return;
+	else if (n == 1 && ((nexttiled(m->clients)))->disablegaps == 0) {
+		gx = gapx;
+		gy = gapy;
+	}
 
-	if (n > m->nmaster)
+	if (n > m->nmaster) {
 		mw = m->nmaster ? m->ww * m->mfact : 0;
-	else
+		ns = m->nmaster > 0 ? 2 : 1;
+	} else {
 		mw = m->ww;
-	for (i = my = ty = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
+		ns = 1;
+	}
+	for(i = 0, my = ty = gy, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++)
 		if (i < m->nmaster) {
-			h = (m->wh - my) / (MIN(n, m->nmaster) - i);
-			resize(c, m->wx, m->wy + my, mw - (2*c->bw), h - (2*c->bw), 0);
+			h = (m->wh - my) / (MIN(n, m->nmaster) - i) - gy;
+			resize(c, m->wx + gx, m->wy + my, mw - (2*c->bw) - gx*(5-ns)/2, h - (2*c->bw), False);
 			if (my + HEIGHT(c) < m->wh)
-				my += HEIGHT(c);
+				my += HEIGHT(c) + gy;
 		} else {
-			h = (m->wh - ty) / (n - i);
-			resize(c, m->wx + mw, m->wy + ty, m->ww - mw - (2*c->bw), h - (2*c->bw), 0);
+			h = (m->wh - ty) / (n - i) - gy;
+			resize(c, m->wx + mw + gx/ns, m->wy + ty, m->ww - mw - (2*c->bw) - gx*(5-ns)/2, h - (2*c->bw), False);
 			if (ty + HEIGHT(c) < m->wh)
-				ty += HEIGHT(c);
+				ty += HEIGHT(c) + gy;
 		}
 }
 
-- 
2.49.1