cyclelayouts patch

- Apply cyclelayouts patch
- Add patch link to README
- Add new layout cycling keybindings to man page

README.md

@@ -53,6 +53,7 @@ and (re)compiling the source code.
 * [autostart](https://dwm.suckless.org/patches/autostart/)
 * [centeredmaster](https://dwm.suckless.org/patches/centeredmaster/)
 * [combo](https://dwm.suckless.org/patches/combo/)
+* [cyclelayouts](https://dwm.suckless.org/patches/cyclelayouts/)
 * [gridmode](https://dwm.suckless.org/patches/gridmode/)
 * [movestack](https://dwm.suckless.org/patches/movestack/)
 * [ru_gaps](https://dwm.suckless.org/patches/ru_gaps/)

config.h

@@ -53,6 +53,7 @@ static const Layout layouts[] = {
 	{ "|M|",      centeredmaster },
 	{ ">M>",      centeredfloatingmaster },
 	{ "HHH",      grid },
+	{ NULL,       NULL },
 };
 
 /* key definitions */
@@ -112,6 +113,8 @@ static Key keys[] = {
 	{ MODKEY,				XK_u,						setlayout,		{.v = &layouts[3]} },
 	{ MODKEY,				XK_o,						setlayout,		{.v = &layouts[4]} },
 	{ MODKEY,				XK_g,						setlayout,		{.v = &layouts[5]} },
+	{ MODKEY|ControlMask,	XK_comma,					cyclelayout,	{.i = -1 } },
+	{ MODKEY|ControlMask,	XK_period,					cyclelayout,	{.i = +1 } },
 	{ MODKEY,               XK_space,					setlayout,      {0} },
 	{ MODKEY|ShiftMask,     XK_space,					togglefloating, {0} },
 	{ MODKEY,               XK_0,						view,           {.ui = ~0} },

dwm.1

@@ -137,6 +137,12 @@ Sets grid layout.
 .B Mod1\-space
 Toggles between current and previous layout.
 .TP
+.B Mod1\-Control\-,
+Cycles backwards in layout list.
+.TP
+.B Mod1\-Control\-.
+Cycles forwards in layout list.
+.TP
 .B Mod1\-j
 Focus next window.
 .TP

dwm.c

@@ -183,6 +183,7 @@ static void configure(Client *c);
 static void configurenotify(XEvent *e);
 static void configurerequest(XEvent *e);
 static Monitor *createmon(void);
+static void cyclelayout(const Arg *arg);
 static void destroynotify(XEvent *e);
 static void detach(Client *c);
 static void detachstack(Client *c);
@@ -786,6 +787,23 @@ createmon(void)
 	return m;
 }
 
+void
+cyclelayout(const Arg *arg) {
+	Layout *l;
+	for(l = (Layout *)layouts; l != selmon->lt[selmon->sellt]; l++);
+	if(arg->i > 0) {
+		if(l->symbol && (l + 1)->symbol)
+			setlayout(&((Arg) { .v = (l + 1) }));
+		else
+			setlayout(&((Arg) { .v = layouts }));
+	} else {
+		if(l != layouts && (l - 1)->symbol)
+			setlayout(&((Arg) { .v = (l - 1) }));
+		else
+			setlayout(&((Arg) { .v = &layouts[LENGTH(layouts) - 2] }));
+	}
+}
+
 void
 destroynotify(XEvent *e)
 {