12-dwm-adjacenttag-6.2.diff

diff -up a/config.def.h b/config.def.h
--- a/config.def.h	2021-10-02 13:57:18.011307099 +0100
+++ b/config.def.h	2021-10-02 13:58:07.812080253 +0100
@@ -84,6 +84,10 @@ 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_Right,  viewnext,       {0} },
+	{ MODKEY,                       XK_Left,   viewprev,       {0} },
+	{ MODKEY|ShiftMask,             XK_Right,  tagtonext,      {0} },
+	{ MODKEY|ShiftMask,             XK_Left,   tagtoprev,      {0} },
 	TAGKEYS(                        XK_1,                      0)
 	TAGKEYS(                        XK_2,                      1)
 	TAGKEYS(                        XK_3,                      2)
diff -up a/dwm.c b/dwm.c
--- a/dwm.c	2021-10-02 13:57:18.011307099 +0100
+++ b/dwm.c	2021-10-02 14:21:17.063622953 +0100
@@ -183,8 +183,10 @@ static void maprequest(XEvent *e);
 static void monocle(Monitor *m);
 static void motionnotify(XEvent *e);
 static void movemouse(const Arg *arg);
+static unsigned int nexttag(void);
 static Client *nexttiled(Client *c);
 static void pop(Client *);
+static unsigned int prevtag(void);
 static void propertynotify(XEvent *e);
 static void quit(const Arg *arg);
 static Monitor *recttomon(int x, int y, int w, int h);
@@ -208,6 +210,8 @@ static void sigchld(int unused);
 static void spawn(const Arg *arg);
 static void tag(const Arg *arg);
 static void tagmon(const Arg *arg);
+static void tagtonext(const Arg *arg);
+static void tagtoprev(const Arg *arg);
 static void tile(Monitor *);
 static void togglebar(const Arg *arg);
 static void togglefloating(const Arg *arg);
@@ -227,6 +231,8 @@ static void updatetitle(Client *c);
 static void updatewindowtype(Client *c);
 static void updatewmhints(Client *c);
 static void view(const Arg *arg);
+static void viewnext(const Arg *arg);
+static void viewprev(const Arg *arg);
 static Client *wintoclient(Window w);
 static Monitor *wintomon(Window w);
 static int xerror(Display *dpy, XErrorEvent *ee);
@@ -1192,6 +1198,13 @@ movemouse(const Arg *arg)
 	}
 }
 
+unsigned int
+nexttag(void)
+{
+	unsigned int seltag = selmon->tagset[selmon->seltags];
+	return seltag == (1 << (LENGTH(tags) - 1)) ? 1 : seltag << 1;
+}
+
 Client *
 nexttiled(Client *c)
 {
@@ -1208,6 +1221,13 @@ pop(Client *c)
 	arrange(c->mon);
 }
 
+unsigned int
+prevtag(void)
+{
+	unsigned int seltag = selmon->tagset[selmon->seltags];
+	return seltag == 1 ? (1 << (LENGTH(tags) - 1)) : seltag >> 1;
+}
+
 void
 propertynotify(XEvent *e)
 {
@@ -1671,6 +1691,32 @@ tagmon(const Arg *arg)
 }
 
 void
+tagtonext(const Arg *arg)
+{
+	unsigned int tmp;
+
+	if (selmon->sel == NULL)
+		return;
+
+	tmp = nexttag();
+	tag(&(const Arg){.ui = tmp });
+	view(&(const Arg){.ui = tmp });
+}
+
+void
+tagtoprev(const Arg *arg)
+{
+	unsigned int tmp;
+
+	if (selmon->sel == NULL)
+		return;
+
+	tmp = prevtag();
+	tag(&(const Arg){.ui = tmp });
+	view(&(const Arg){.ui = tmp });
+}
+
+void
 tile(Monitor *m)
 {
 	unsigned int i, n, h, mw, my, ty;
@@ -2044,6 +2090,18 @@ view(const Arg *arg)
 	arrange(selmon);
 }
 
+void
+viewnext(const Arg *arg)
+{
+	view(&(const Arg){.ui = nexttag()});
+}
+
+void
+viewprev(const Arg *arg)
+{
+	view(&(const Arg){.ui = prevtag()});
+}
+ 
 Client *
 wintoclient(Window w)
 {