Added 'shiftview' functionality

Author: pvpscript

README.md

@@ -8,5 +8,6 @@ This build contains the following patches:
   * [tcl](https://dwm.suckless.org/patches/three-column/)
   * [gaplessgrid](https://dwm.suckless.org/patches/gaplessgrid/)
   * [tagall](https://dwm.suckless.org/patches/tagall/)
+  * [shiftview](https://lists.suckless.org/dev/1104/7590.html)
 
 Including some changes in the config file.

config.h

@@ -73,6 +73,7 @@ static const char *termcmd[]  = { "st", NULL };
 
 #include <X11/XF86keysym.h>
 #include "tagall.c"
+#include "shiftview.c"
 
 static Key keys[] = {
 	/* modifier                     key        function        argument */
@@ -113,15 +114,20 @@ static Key keys[] = {
 	TAGKEYS(                        XK_9,                      8)
 	{ MODKEY|ShiftMask,             XK_q,      quit,           {0} },
 
-	{ MODKEY|ShiftMask,		XK_F1,	   tagall,	   {.v = "1"} },
-	{ MODKEY|ShiftMask,		XK_F2,	   tagall,	   {.v = "2"} },
-	{ MODKEY|ShiftMask,		XK_F3,	   tagall,	   {.v = "3"} },
-	{ MODKEY|ShiftMask,		XK_F4,	   tagall,	   {.v = "4"} },
-	{ MODKEY|ShiftMask,		XK_F5,	   tagall,	   {.v = "5"} },
-	{ MODKEY|ShiftMask,		XK_F6,	   tagall,	   {.v = "6"} },
-	{ MODKEY|ShiftMask,		XK_F7,	   tagall,	   {.v = "7"} },
-	{ MODKEY|ShiftMask,		XK_F8,	   tagall,	   {.v = "8"} },
-	{ MODKEY|ShiftMask,		XK_F9,	   tagall,	   {.v = "9"} },
+	/* 'tagall' shortcuts */
+	{ MODKEY|ShiftMask,		XK_F1,		tagall,		{.v = "1"} },
+	{ MODKEY|ShiftMask,		XK_F2,		tagall,		{.v = "2"} },
+	{ MODKEY|ShiftMask,		XK_F3,		tagall,		{.v = "3"} },
+	{ MODKEY|ShiftMask,		XK_F4,		tagall,		{.v = "4"} },
+	{ MODKEY|ShiftMask,		XK_F5,		tagall,		{.v = "5"} },
+	{ MODKEY|ShiftMask,		XK_F6,		tagall,		{.v = "6"} },
+	{ MODKEY|ShiftMask,		XK_F7,		tagall,		{.v = "7"} },
+	{ MODKEY|ShiftMask,		XK_F8,		tagall,		{.v = "8"} },
+	{ MODKEY|ShiftMask,		XK_F9,		tagall,		{.v = "9"} },
+
+	/* 'shiftview' shortcuts */
+	{ MODKEY,			XK_Page_Up,	shiftview,	{.i = -1} },
+	{ MODKEY,			XK_Page_Down,	shiftview,	{.i = -1} },
 
 	{ 0, XF86XK_AudioMute, spawn, SHCMD("amixer sset Master toggle")},
 	{ 0, XF86XK_AudioRaiseVolume, spawn, SHCMD("amixer sset Master 5%+")},

shiftview.c

@@ -0,0 +1,19 @@
+/** Function to shift the current view to the left/right
+ *
+ * @param: "arg->i" stores the number of tags to shift right (positive value)
+ *          or left (negative value)
+ */
+void
+shiftview(const Arg *arg) {
+	Arg shifted;
+
+	if(arg->i > 0) // left circular shift
+		shifted.ui = (selmon->tagset[selmon->seltags] << arg->i)
+		   | (selmon->tagset[selmon->seltags] >> (LENGTH(tags) - arg->i));
+
+	else // right circular shift
+		shifted.ui = selmon->tagset[selmon->seltags] >> (- arg->i)
+		   | selmon->tagset[selmon->seltags] << (LENGTH(tags) + arg->i);
+
+	view(&shifted);
+}