From b55c4bc2efa0331a6fb521d41169e8ddf8bc9b13 Mon Sep 17 00:00:00 2001
From: Jack Bird <jack.bird@durham.ac.uk>
Date: Sun, 29 Aug 2021 17:30:40 +0100
Subject: [PATCH] Added momentary config option

---
 config.def.h |  3 +++
 dwm.c        | 35 +++++++++++++++++++++++++++++++++--
 2 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/config.def.h b/config.def.h
index 1c0b587..4cfcef1 100644
--- a/config.def.h
+++ b/config.def.h
@@ -20,6 +20,8 @@ static const char *colors[][3]      = {
 
 /* tagging */
 static const char *tags[] = { "1", "2", "3", "4", "5", "6", "7", "8", "9" };
+static const char *tagsalt[] = { "1", "2", "3", "4", "5", "6", "7", "8", "9" };
+static const int momentaryalttags = 0; /* 1 means alttags will show only when key is held down*/
 
 static const Rule rules[] = {
 	/* xprop(1):
@@ -84,6 +86,7 @@ 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_n,      togglealttag,   {0} },
 	TAGKEYS(                        XK_1,                      0)
 	TAGKEYS(                        XK_2,                      1)
 	TAGKEYS(                        XK_3,                      2)
diff --git a/dwm.c b/dwm.c
index 4465af1..1e6e6f3 100644
--- a/dwm.c
+++ b/dwm.c
@@ -130,6 +130,7 @@ struct Monitor {
 	Monitor *next;
 	Window barwin;
 	const Layout *lt[2];
+	unsigned int alttag;
 };
 
 typedef struct {
@@ -176,6 +177,7 @@ static void grabbuttons(Client *c, int focused);
 static void grabkeys(void);
 static void incnmaster(const Arg *arg);
 static void keypress(XEvent *e);
+static void keyrelease(XEvent *e);
 static void killclient(const Arg *arg);
 static void manage(Window w, XWindowAttributes *wa);
 static void mappingnotify(XEvent *e);
@@ -209,6 +211,7 @@ static void spawn(const Arg *arg);
 static void tag(const Arg *arg);
 static void tagmon(const Arg *arg);
 static void tile(Monitor *);
+static void togglealttag();
 static void togglebar(const Arg *arg);
 static void togglefloating(const Arg *arg);
 static void toggletag(const Arg *arg);
@@ -253,6 +256,7 @@ static void (*handler[LASTEvent]) (XEvent *) = {
 	[Expose] = expose,
 	[FocusIn] = focusin,
 	[KeyPress] = keypress,
+    [KeyRelease] = keyrelease,
 	[MappingNotify] = mappingnotify,
 	[MapRequest] = maprequest,
 	[MotionNotify] = motionnotify,
@@ -695,7 +699,7 @@ dirtomon(int dir)
 void
 drawbar(Monitor *m)
 {
-	int x, w, sw = 0;
+	int x, w, wdelta, sw = 0;
 	int boxs = drw->fonts->h / 9;
 	int boxw = drw->fonts->h / 6 + 2;
 	unsigned int i, occ = 0, urg = 0;
@@ -716,8 +720,9 @@ drawbar(Monitor *m)
 	x = 0;
 	for (i = 0; i < LENGTH(tags); i++) {
 		w = TEXTW(tags[i]);
+		wdelta = selmon->alttag ? abs(TEXTW(tags[i]) - TEXTW(tagsalt[i])) / 2 : 0;
 		drw_setscheme(drw, scheme[m->tagset[m->seltags] & 1 << i ? SchemeSel : SchemeNorm]);
-		drw_text(drw, x, 0, w, bh, lrpad / 2, tags[i], urg & 1 << i);
+		drw_text(drw, x, 0, w, bh, wdelta + lrpad / 2, (selmon->alttag ? tagsalt[i] : tags[i]), urg & 1 << i);
 		if (occ & 1 << i)
 			drw_rect(drw, x + boxs, boxs, boxw, boxw,
 				m == selmon && selmon->sel && selmon->sel->tags & 1 << i,
@@ -998,6 +1003,25 @@ keypress(XEvent *e)
 			keys[i].func(&(keys[i].arg));
 }
 
+void
+keyrelease(XEvent *e)
+{
+	unsigned int i;
+	KeySym keysym;
+	XKeyEvent *ev;
+
+	ev = &e->xkey;
+	keysym = XKeycodeToKeysym(dpy, (KeyCode)ev->keycode, 0);
+
+    for (i = 0; i < LENGTH(keys); i++)
+        if (momentaryalttags
+        && keys[i].func && keys[i].func == togglealttag
+        && selmon->alttag
+        && (keysym == keys[i].keysym
+        || CLEANMASK(keys[i].mod) == CLEANMASK(ev->state)))
+            keys[i].func(&(keys[i].arg));
+}
+
 void
 killclient(const Arg *arg)
 {
@@ -1696,6 +1720,13 @@ tile(Monitor *m)
 		}
 }
 
+void
+togglealttag()
+{
+	selmon->alttag = !selmon->alttag;
+	drawbar(selmon);
+}
+
 void
 togglebar(const Arg *arg)
 {
-- 
2.33.0