/* https://dwm.suckless.org/patches/columns/ */
--- dwm.c.orig	2015-11-08 23:39:37.000000000 +0100
+++ dwm.c	2018-07-17 23:21:18.248885244 +0200
@@ -154,6 +154,7 @@
 static void cleanupmon(Monitor *mon);
 static void clearurgent(Client *c);
 static void clientmessage(XEvent *e);
+static void col(Monitor *);
 static void configure(Client *c);
 static void configurenotify(XEvent *e);
 static void configurerequest(XEvent *e);
@@ -542,6 +543,33 @@
 	}
 }
 
+void
+col(Monitor *m)
+{
+	unsigned int i, n, h, w, x, y,mw;
+	Client *c;
+
+	for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), n++);
+	if(n == 0)
+		return;
+	if(n > m->nmaster)
+		mw = m->nmaster ? m->ww * m->mfact : 0;
+	else
+		mw = m->ww;
+	for(i = x = y = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next), i++) {
+		if(i < m->nmaster) {
+			w = (mw - x) / (MIN(n, m->nmaster)-i);
+			resize(c, x + m->wx, m->wy, w - (2*c->bw), m->wh - (2*c->bw), False);
+			x += WIDTH(c);
+		}
+		else {
+			h = (m->wh - y) / (n - i);
+			resize(c, x + m->wx, m->wy + y, m->ww - x  - (2*c->bw), h - (2*c->bw), False);
+			y += HEIGHT(c);
+		}
+	}
+}
+
 void
 configure(Client *c)
 {
--- config.def.h.orig	2015-11-08 23:39:37.000000000 +0100
+++ config.def.h	2018-07-17 23:18:34.688205413 +0200
@@ -39,6 +39,7 @@
 	{ "[]=",      tile },    /* first entry is default */
 	{ "><>",      NULL },    /* no layout function means floating behavior */
 	{ "[M]",      monocle },
+	{ "|||",      col },
 };
 
 /* key definitions */
@@ -74,6 +75,7 @@
 	{ MODKEY,                       XK_t,      setlayout,      {.v = &layouts[0]} },
 	{ MODKEY,                       XK_f,      setlayout,      {.v = &layouts[1]} },
 	{ MODKEY,                       XK_m,      setlayout,      {.v = &layouts[2]} },
+	{ MODKEY,                       XK_c,      setlayout,      {.v = &layouts[3]} },
 	{ MODKEY,                       XK_space,  setlayout,      {0} },
 	{ MODKEY|ShiftMask,             XK_space,  togglefloating, {0} },
 	{ MODKEY,                       XK_0,      view,           {.ui = ~0 } },