From 693081eb1e028368cc32d3dd2d1f46af341f121e Mon Sep 17 00:00:00 2001
From: Malfurious <m@lfurio.us>
Date: Mon, 22 Jun 2020 00:49:08 -0400
Subject: patch: scratchpad

The scratchpad patch allows you to spawn or restore a floating terminal
window. It is usually useful to have one to do some short typing.

A tool like detach (http://detach.sourceforge.net) turns it into a
launchpad for X applications.

By default your terminal (st) is used, and the default key binding is
MODKEY+XK_grave. A config.def.h change is included in the patch.
---
 config.def.h |  3 +++
 dwm.c        | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/config.def.h b/config.def.h
index bb67a43..1609683 100644
--- a/config.def.h
+++ b/config.def.h
@@ -72,6 +72,8 @@ static const char *slockcmd[]  = { "slock", NULL };
 static const char *slockucmd[] = { "slock", "-u", NULL };
 static const char *browsercmd[] = { "qutebrowser", NULL };
 static const char *browserpcmd[] = { "qutebrowser", "--target", "private-window", NULL };
+static const char scratchpadname[] = "scratchpad";
+static const char *scratchpadcmd[] = { "st", "-t", scratchpadname, "-g", "120x34", NULL };
 
 static const Key keys[] = {
 	/* modifier                     key        function        argument */
@@ -81,6 +83,7 @@ static const Key keys[] = {
 	{ MODKEY|ShiftMask,             XK_z,      spawn,          {.v = slockucmd } },
 	{ MODKEY|ShiftMask,             XK_backslash, spawn,       {.v = browsercmd } },
 	{ MODKEY|ControlMask|ShiftMask, XK_backslash, spawn,       {.v = browserpcmd } },
+	{ MODKEY,                       XK_grave,  togglescratch,  {.v = scratchpadcmd } },
 	{ MODKEY,                       XK_j,      focusstack,     {.i = +1 } },
 	{ MODKEY,                       XK_k,      focusstack,     {.i = -1 } },
 	{ MODKEY,                       XK_i,      incnmaster,     {.i = +1 } },
diff --git a/dwm.c b/dwm.c
index f4965e8..37373da 100644
--- a/dwm.c
+++ b/dwm.c
@@ -219,6 +219,7 @@ static void tag(const Arg *arg);
 static void tagmon(const Arg *arg);
 static void tile(Monitor *m);
 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);
@@ -296,6 +297,8 @@ struct Pertag {
 	const Layout *ltidxs[LENGTH(tags) + 1][2]; /* matrix of tags and layouts indexes  */
 };
 
+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]; };
 
@@ -1124,6 +1127,14 @@ 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);
@@ -1769,6 +1780,7 @@ 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));
@@ -1868,6 +1880,28 @@ 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)
 {
-- 
cgit v1.2.3