From 2666387a3f50c21b0503e9a7291f012e70e92086 Mon Sep 17 00:00:00 2001
From: NlGHT <night@nightmusic.net>
Date: Sat, 27 Mar 2021 12:01:26 +0100
Subject: [PATCH] Default tag apps - set application for each tag
Then you can use the one keybind to spawn the default application of the tag you're on.

---
 config.def.h |  2 ++
 dwm.c        | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/config.def.h b/config.def.h
index 1c0b587..066c7cc 100644
--- a/config.def.h
+++ b/config.def.h
@@ -20,6 +20,7 @@ static const char *colors[][3]      = {

 /* tagging */
 static const char *tags[] = { "1", "2", "3", "4", "5", "6", "7", "8", "9" };
+static const char *defaulttagapps[] = { "st", NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL };

 static const Rule rules[] = {
 	/* xprop(1):
@@ -63,6 +64,7 @@ static Key keys[] = {
 	/* modifier                     key        function        argument */
 	{ MODKEY,                       XK_p,      spawn,          {.v = dmenucmd } },
 	{ MODKEY|ShiftMask,             XK_Return, spawn,          {.v = termcmd } },
+	{ MODKEY,                       XK_s,      spawndefault,   {0} },
 	{ MODKEY,                       XK_b,      togglebar,      {0} },
 	{ MODKEY,                       XK_j,      focusstack,     {.i = +1 } },
 	{ MODKEY,                       XK_k,      focusstack,     {.i = -1 } },
diff --git a/dwm.c b/dwm.c
index 664c527..e0769ec 100644
--- a/dwm.c
+++ b/dwm.c
@@ -200,6 +200,7 @@ static void sendmon(Client *c, Monitor *m);
 static void setclientstate(Client *c, long state);
 static void setfocus(Client *c);
 static void setfullscreen(Client *c, int fullscreen);
+static void setlasttag(int tagbit);
 static void setlayout(const Arg *arg);
 static void setmfact(const Arg *arg);
 static void setup(void);
@@ -207,6 +208,7 @@ static void seturgent(Client *c, int urg);
 static void showhide(Client *c);
 static void sigchld(int unused);
 static void spawn(const Arg *arg);
+static void spawndefault();
 static void tag(const Arg *arg);
 static void tagmon(const Arg *arg);
 static void tile(Monitor *);
@@ -269,6 +271,9 @@ static Drw *drw;
 static Monitor *mons, *selmon;
 static Window root, wmcheckwin;

+static int lastchosentag[8];
+static int previouschosentag[8];
+
 /* configuration, allows nested code to access above variables */
 #include "config.h"

@@ -1498,6 +1503,24 @@ setfullscreen(Client *c, int fullscreen)
 	}
 }

+void
+setlasttag(int tagbit) {
+	const int mon = selmon->num;
+	if (tagbit > 0) {
+		int i = 1, pos = 0;
+		while (!(i & tagbit)) {
+			i = i << 1;
+			++pos;
+		}
+		previouschosentag[mon] = lastchosentag[mon];
+		lastchosentag[mon] = pos;
+	} else {
+		const int tempTag = lastchosentag[mon];
+		lastchosentag[mon] = previouschosentag[mon];
+		previouschosentag[mon] = tempTag;
+	}
+}
+
 void
 setlayout(const Arg *arg)
 {
@@ -1653,6 +1676,17 @@ spawn(const Arg *arg)
 	}
 }

+void
+spawndefault()
+{
+	const char *app = defaulttagapps[lastchosentag[selmon->num]];
+	if (app) {
+		const char *defaultcmd[] = {app, NULL};
+		Arg a = {.v = defaultcmd};
+		spawn(&a);
+	}
+}
+
 void
 tag(const Arg *arg)
 {
@@ -1744,6 +1778,7 @@ toggleview(const Arg *arg)

 	if (newtagset) {
 		selmon->tagset[selmon->seltags] = newtagset;
+		setlasttag(newtagset);
 		focus(NULL);
 		arrange(selmon);
 	}
@@ -2040,6 +2075,7 @@ view(const Arg *arg)
 {
 	if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
 		return;
+	setlasttag(arg->ui);
 	selmon->seltags ^= 1; /* toggle sel tagset */
 	if (arg->ui & TAGMASK)
 		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
--
2.31.0