From bb98aa123fe3490aa731a16e95fe8b4d30d7fe5e Mon Sep 17 00:00:00 2001
From: bakkeby <bakkeby@gmail.com>
Date: Fri, 1 May 2020 22:20:25 +0200
Subject: [PATCH] cyclelayout, function to cycle through available layouts.

MOD-CTRL-, and MOD-CTRL-.
cycle backwards and forwards through available layouts.
Probably only useful if you have a lot of additional layouts.
The NULL, NULL layout should always be the last layout in your list,
in order to guarantee consistent behavior.

Refer to https://dwm.suckless.org/patches/cyclelayouts/
---
 config.def.h |  3 +++
 dwm.1        |  6 ++++++
 dwm.c        | 18 ++++++++++++++++++
 3 files changed, 27 insertions(+)

diff --git a/config.def.h b/config.def.h
index 1c0b587..9a71a37 100644
--- a/config.def.h
+++ b/config.def.h
@@ -41,6 +41,7 @@ static const Layout layouts[] = {
 	{ "[]=",      tile },    /* first entry is default */
 	{ "><>",      NULL },    /* no layout function means floating behavior */
 	{ "[M]",      monocle },
+	{ NULL,       NULL },
 };
 
 /* key definitions */
@@ -84,6 +85,8 @@ static Key keys[] = {
 	{ MODKEY,                       XK_period, focusmon,       {.i = +1 } },
 	{ MODKEY|ShiftMask,             XK_comma,  tagmon,         {.i = -1 } },
 	{ MODKEY|ShiftMask,             XK_period, tagmon,         {.i = +1 } },
+	{ MODKEY|ControlMask,           XK_comma,  cyclelayout,    {.i = -1 } },
+	{ MODKEY|ControlMask,           XK_period, cyclelayout,    {.i = +1 } },
 	TAGKEYS(                        XK_1,                      0)
 	TAGKEYS(                        XK_2,                      1)
 	TAGKEYS(                        XK_3,                      2)
diff --git a/dwm.1 b/dwm.1
index 13b3729..165891b 100644
--- a/dwm.1
+++ b/dwm.1
@@ -92,6 +92,12 @@ Sets monocle 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
diff --git a/dwm.c b/dwm.c
index 4465af1..26db8e3 100644
--- a/dwm.c
+++ b/dwm.c
@@ -157,6 +157,7 @@ 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);
@@ -644,6 +645,23 @@ 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)
 {
-- 
2.19.1