add scratchpad

config.def.h

@@ -58,11 +58,14 @@ static const Layout layouts[] = {
 /* commands */
 static const char *dmenucmd[] = { "dmenu_run", "-fn", dmenufont, "-nb", col_gray1, "-nf", col_gray3, "-sb", col_cyan, "-sf", col_gray4, NULL };
 static const char *termcmd[]  = { "st", NULL };
+static const char scratchpadname[] = "scratchpad";
+static const char *scratchpadcmd[] = { "st", "-t", scratchpadname, "-g", "120x34", NULL };
 
 static const Key keys[] = {
 	/* modifier                     key        function        argument */
 	{ MODKEY,                       XK_p,      spawn,          {.v = dmenucmd } },
 	{ MODKEY|ShiftMask,             XK_Return, spawn,          {.v = termcmd } },
+	{ MODKEY,                       XK_grave,  togglescratch,  {.v = scratchpadcmd } },
 	{ MODKEY,                       XK_b,      togglebar,      {0} },
 	{ MODKEY,                       XK_j,      focusstack,     {.i = +1 } },
 	{ MODKEY,                       XK_k,      focusstack,     {.i = -1 } },

config.h

@@ -61,12 +61,15 @@ static char dmenumon[2] = "0"; /* component of dmenucmd, manipulated in spawn()
 static const char *dmenucmd[] = { "dmenu_run", "-m", dmenumon, "-fn", dmenufont, "-nb", col_pink, "-nf", col_gray1, "-sb", col_gray1, "-sf", col_gray3, NULL };
 static const char *browsercmd[]  = { "qutebrowser", NULL };
 static const char *termcmd[]  = { "kitty", NULL };
+static const char scratchpadname[] = "scratchpad";
+static const char *scratchpadcmd[] = { "st", "-t", scratchpadname, "-g", "120x34", NULL };
 
 static Key keys[] = {
 	/* modifier                     key                 function        argument */
 	{ MODKEY,                       XK_p,               spawn,          {.v = dmenucmd } },
 	{ MODKEY,                       XK_q,               spawn,          {.v = browsercmd } },
 	{ MODKEY|ShiftMask,             XK_Return,          spawn,          {.v = termcmd } },
+    { MODKEY,                       XK_grave,           togglescratch,  {.v = scratchpadcmd } },
 	{ MODKEY,                       XK_b,               togglebar,      {0} },
 	{ MODKEY,                       XK_j,               focusstack,     {.i = +1 } },
 	{ MODKEY,                       XK_k,               focusstack,     {.i = -1 } },

dwm.c

@@ -216,6 +216,7 @@ static void tagtoprev(const Arg *arg);
 static void tile(Monitor *m);
 static void togglebar(const Arg *arg);
 static void togglefloating(const Arg *arg);
+static void togglescratch(const Arg *arg);
 static void toggletag(const Arg *arg);
 static void toggleview(const Arg *arg);
 static void unfocus(Client *c, int setfocus);
@@ -278,6 +279,8 @@ static Window root, wmcheckwin;
 /* configuration, allows nested code to access above variables */
 #include "config.h"
 
+static unsigned int scratchtag = 1 << LENGTH(tags);
+
 /* compile-time check if all tags fit into an unsigned int bit array. */
 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 
@@ -1057,6 +1060,14 @@ manage(Window w, XWindowAttributes *wa)
 	c->y = MAX(c->y, c->mon->wy);
 	c->bw = borderpx;
 
+	selmon->tagset[selmon->seltags] &= ~scratchtag;
+	if (!strcmp(c->name, scratchpadname)) {
+		c->mon->tagset[c->mon->seltags] |= c->tags = scratchtag;
+		c->isfloating = True;
+		c->x = c->mon->wx + (c->mon->ww / 2 - WIDTH(c) / 2);
+		c->y = c->mon->wy + (c->mon->wh / 2 - HEIGHT(c) / 2);
+	}
+
 	wc.border_width = c->bw;
 	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
 	XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
@@ -1658,6 +1669,9 @@ sigchld(int unused)
 void
 spawn(const Arg *arg)
 {
+	if (arg->v == dmenucmd)
+		dmenumon[0] = '0' + selmon->num;
+	selmon->tagset[selmon->seltags] &= ~scratchtag;
 	if (fork() == 0) {
 		if (dpy)
 			close(ConnectionNumber(dpy));
@@ -1762,6 +1776,28 @@ togglefloating(const Arg *arg)
 	arrange(selmon);
 }
 
+void
+togglescratch(const Arg *arg)
+{
+	Client *c;
+	unsigned int found = 0;
+
+	for (c = selmon->clients; c && !(found = c->tags & scratchtag); c = c->next);
+	if (found) {
+		unsigned int newtagset = selmon->tagset[selmon->seltags] ^ scratchtag;
+		if (newtagset) {
+			selmon->tagset[selmon->seltags] = newtagset;
+			focus(NULL);
+			arrange(selmon);
+		}
+		if (ISVISIBLE(c)) {
+			focus(c);
+			restack(selmon);
+		}
+	} else
+		spawn(arg);
+}
+
 void
 toggletag(const Arg *arg)
 {

patches/dwm-scratchpad-6.2.diff

@@ -0,0 +1,90 @@
+diff -up a/config.def.h b/config.def.h
+--- a/config.def.h	2019-06-06 21:23:27.006661784 +0200
++++ b/config.def.h	2019-06-20 15:05:59.083102462 +0200
+@@ -58,11 +58,14 @@ static const Layout layouts[] = {
+ static char dmenumon[2] = "0"; /* component of dmenucmd, manipulated in spawn() */
+ static const char *dmenucmd[] = { "dmenu_run", "-m", dmenumon, "-fn", dmenufont, "-nb", col_gray1, "-nf", col_gray3, "-sb", col_cyan, "-sf", col_gray4, NULL };
+ static const char *termcmd[]  = { "st", NULL };
++static const char scratchpadname[] = "scratchpad";
++static const char *scratchpadcmd[] = { "st", "-t", scratchpadname, "-g", "120x34", NULL };
+ 
+ static Key keys[] = {
+ 	/* modifier                     key        function        argument */
+ 	{ MODKEY,                       XK_p,      spawn,          {.v = dmenucmd } },
+ 	{ MODKEY|ShiftMask,             XK_Return, spawn,          {.v = termcmd } },
++	{ MODKEY,                       XK_grave,  togglescratch,  {.v = scratchpadcmd } },
+ 	{ MODKEY,                       XK_b,      togglebar,      {0} },
+ 	{ MODKEY,                       XK_j,      focusstack,     {.i = +1 } },
+ 	{ MODKEY,                       XK_k,      focusstack,     {.i = -1 } },
+diff -up a/dwm.c b/dwm.c
+--- a/dwm.c	2019-06-06 21:23:27.023328450 +0200
++++ b/dwm.c	2019-06-20 15:07:01.089767947 +0200
+@@ -213,6 +213,7 @@ static void tagmon(const Arg *arg);
+ static void tile(Monitor *);
+ static void togglebar(const Arg *arg);
+ static void togglefloating(const Arg *arg);
++static void togglescratch(const Arg *arg);
+ static void toggletag(const Arg *arg);
+ static void toggleview(const Arg *arg);
+ static void unfocus(Client *c, int setfocus);
+@@ -273,6 +274,8 @@ static Window root, wmcheckwin;
+ /* configuration, allows nested code to access above variables */
+ #include "config.h"
+ 
++static unsigned int scratchtag = 1 << LENGTH(tags);
++
+ /* compile-time check if all tags fit into an unsigned int bit array. */
+ struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
+ 
+@@ -1052,6 +1055,14 @@ manage(Window w, XWindowAttributes *wa)
+ 		&& (c->x + (c->w / 2) < c->mon->wx + c->mon->ww)) ? bh : c->mon->my);
+ 	c->bw = borderpx;
+ 
++	selmon->tagset[selmon->seltags] &= ~scratchtag;
++	if (!strcmp(c->name, scratchpadname)) {
++		c->mon->tagset[c->mon->seltags] |= c->tags = scratchtag;
++		c->isfloating = True;
++		c->x = c->mon->wx + (c->mon->ww / 2 - WIDTH(c) / 2);
++		c->y = c->mon->wy + (c->mon->wh / 2 - HEIGHT(c) / 2);
++	}
++
+ 	wc.border_width = c->bw;
+ 	XConfigureWindow(dpy, w, CWBorderWidth, &wc);
+ 	XSetWindowBorder(dpy, w, scheme[SchemeNorm][ColBorder].pixel);
+@@ -1661,6 +1672,7 @@ spawn(const Arg *arg)
+ {
+ 	if (arg->v == dmenucmd)
+ 		dmenumon[0] = '0' + selmon->num;
++	selmon->tagset[selmon->seltags] &= ~scratchtag;
+ 	if (fork() == 0) {
+ 		if (dpy)
+ 			close(ConnectionNumber(dpy));
+@@ -1748,6 +1760,28 @@ togglefloating(const Arg *arg)
+ }
+ 
+ void
++togglescratch(const Arg *arg)
++{
++	Client *c;
++	unsigned int found = 0;
++
++	for (c = selmon->clients; c && !(found = c->tags & scratchtag); c = c->next);
++	if (found) {
++		unsigned int newtagset = selmon->tagset[selmon->seltags] ^ scratchtag;
++		if (newtagset) {
++			selmon->tagset[selmon->seltags] = newtagset;
++			focus(NULL);
++			arrange(selmon);
++		}
++		if (ISVISIBLE(c)) {
++			focus(c);
++			restack(selmon);
++		}
++	} else
++		spawn(arg);
++}
++
++void
+ toggletag(const Arg *arg)
+ {
+ 	unsigned int newtags;