From 7600ab7f23e732062ce5ff34a42ca0f1ce019702 Mon Sep 17 00:00:00 2001
From: Sam <tritoke@protonmail.com>
Date: Fri, 23 Jul 2021 18:38:03 +0100
Subject: [PATCH] Created rotatetags function, and keybinds.

- Added rotatetags function which rotates the tagset left / right the
given number of tags, including wrapping round the ends if necessary.

- Added keybinds for MOD + left and right arrows, moving the tagset left /
right respectively.
---
 config.def.h |  2 ++
 dwm.c        | 28 ++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/config.def.h b/config.def.h
index 1c0b587..2992431 100644
--- a/config.def.h
+++ b/config.def.h
@@ -84,6 +84,8 @@ static Key keys[] = {
 	{ MODKEY,                       XK_period, focusmon,       {.i = +1 } },
 	{ MODKEY|ShiftMask,             XK_comma,  tagmon,         {.i = -1 } },
 	{ MODKEY|ShiftMask,             XK_period, tagmon,         {.i = +1 } },
+	{ MODKEY,                       XK_Left,   rotatetags,     {.i = -1 } },
+	{ MODKEY,                       XK_Right,  rotatetags,     {.i = +1 } },
 	TAGKEYS(                        XK_1,                      0)
 	TAGKEYS(                        XK_2,                      1)
 	TAGKEYS(                        XK_3,                      2)
diff --git a/dwm.c b/dwm.c
index 4465af1..768166e 100644
--- a/dwm.c
+++ b/dwm.c
@@ -192,6 +192,7 @@ static void resize(Client *c, int x, int y, int w, int h, int interact);
 static void resizeclient(Client *c, int x, int y, int w, int h);
 static void resizemouse(const Arg *arg);
 static void restack(Monitor *m);
+static void rotatetags(const Arg *arg);
 static void run(void);
 static void scan(void);
 static int sendevent(Client *c, Atom proto);
@@ -1369,6 +1370,33 @@ restack(Monitor *m)
 	while (XCheckMaskEvent(dpy, EnterWindowMask, &ev));
 }
 
+void
+rotatetags(const Arg *arg)
+{
+	const int rot = abs(arg->i);
+	const unsigned int tagset = selmon->tagset[selmon->seltags];
+	unsigned int newtagset;
+
+	/* check the direction of the shift */
+	if (arg->i < 0) {
+		 /* shift tags right */
+		 newtagset = (tagset >> rot) | (tagset << (LENGTH(tags) - rot));
+	} else {
+		 /* shift tags left */
+		 newtagset = (tagset << rot) | (tagset >> (LENGTH(tags) - rot));
+	}
+
+	/* mask the tag bits */
+	newtagset &= TAGMASK;
+
+	if (newtagset) {
+		 selmon->tagset[selmon->seltags] = newtagset;
+		 focus(NULL);
+		 arrange(selmon);
+	}
+}
+
+
 void
 run(void)
 {
-- 
2.32.0