Author: Jan Christoph Ebersbach <jceb@e-jc.de>
URL: http://dwm.suckless.org/patches/maximize
These patches provide helper functions for moving and resizing floating windows
using keybindings.

Index: dwm/dwm.c
===================================================================
--- dwm/dwm.c.orig
+++ dwm/dwm.c
@@ -93,7 +93,7 @@ struct Client {
 	int basew, baseh, incw, inch, maxw, maxh, minw, minh;
 	int bw, oldbw;
 	unsigned int tags;
-	int isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
+	int ismax, wasfloating, isfixed, isfloating, isurgent, neverfocus, oldstate, isfullscreen;
 	Client *next;
 	Client *snext;
 	Monitor *mon;
@@ -1075,6 +1075,8 @@ manage(Window w, XWindowAttributes *wa)
 	updatewmhints(c);
 	XSelectInput(dpy, w, EnterWindowMask|FocusChangeMask|PropertyChangeMask|StructureNotifyMask);
 	grabbuttons(c, 0);
+	c->wasfloating = 0;
+	c->ismax = 0;
 	if (!c->isfloating)
 		c->isfloating = c->oldstate = trans != None || c->isfixed;
 	if (c->isfloating)
Index: dwm/maximize.c
===================================================================
--- /dev/null
+++ dwm/maximize.c
@@ -0,0 +1,45 @@
+void
+maximize(int x, int y, int w, int h) {
+	XEvent ev;
+
+	if(!selmon->sel || selmon->sel->isfixed)
+		return;
+	XRaiseWindow(dpy, selmon->sel->win);
+	if(!selmon->sel->ismax) {
+		if(!selmon->lt[selmon->sellt]->arrange || selmon->sel->isfloating)
+			selmon->sel->wasfloating = True;
+		else {
+			togglefloating(NULL);
+			selmon->sel->wasfloating = False;
+		}
+		selmon->sel->oldx = selmon->sel->x;
+		selmon->sel->oldy = selmon->sel->y;
+		selmon->sel->oldw = selmon->sel->w;
+		selmon->sel->oldh = selmon->sel->h;
+		resize(selmon->sel, x, y, w, h, True);
+		selmon->sel->ismax = True;
+	}
+	else {
+		resize(selmon->sel, selmon->sel->oldx, selmon->sel->oldy, selmon->sel->oldw, selmon->sel->oldh, True);
+		if(!selmon->sel->wasfloating)
+			togglefloating(NULL);
+		selmon->sel->ismax = False;
+	}
+	drawbar(selmon);
+	while(XCheckMaskEvent(dpy, EnterWindowMask, &ev));
+}
+
+void
+togglemaximize(const Arg *arg) {
+	maximize(selmon->wx, selmon->wy, selmon->ww - 2 * borderpx, selmon->wh - 2 * borderpx);
+}
+
+void
+toggleverticalmax(const Arg *arg) {
+	maximize(selmon->sel->x, selmon->wy, selmon->sel->w, selmon->wh - 2 * borderpx);
+}
+
+void
+togglehorizontalmax(const Arg *arg) {
+	maximize(selmon->wx, selmon->sel->y, selmon->ww - 2 * borderpx, selmon->sel->h);
+}