From 66287944c0799061525a6182c1019b9ef72328a4 Mon Sep 17 00:00:00 2001
From: Guido Cella <guido@guidocella.xyz>
Date: Wed, 3 May 2023 09:28:20 +0200
Subject: [PATCH] Port pertag

---
 config.def.h |  2 +-
 dwl.c        | 79 ++++++++++++++++++++++++++++++++++++++++++++++++----
 2 files changed, 75 insertions(+), 6 deletions(-)

diff --git a/config.def.h b/config.def.h
index c6a4950..0ce188f 100644
--- a/config.def.h
+++ b/config.def.h
@@ -8,7 +8,7 @@ static const float focuscolor[]            = {1.0, 0.0, 0.0, 1.0};
 static const float fullscreen_bg[]         = {0.1, 0.1, 0.1, 1.0};
 
 /* tagging - tagcount must be no greater than 31 */
-static const int tagcount = 9;
+#define tagcount 9
 
 static const Rule rules[] = {
 	/* app_id     title       tags mask     isfloating   monitor */
diff --git a/dwl.c b/dwl.c
index b7436bb..15b9977 100644
--- a/dwl.c
+++ b/dwl.c
@@ -94,6 +94,7 @@ typedef struct {
 	const Arg arg;
 } Button;
 
+typedef struct Pertag Pertag;
 typedef struct Monitor Monitor;
 typedef struct {
 	/* Must keep these three elements in this order */
@@ -185,6 +186,7 @@ struct Monitor {
 	struct wlr_box w; /* window area, layout-relative */
 	struct wl_list layers[4]; /* LayerSurface::link */
 	const Layout *lt[2];
+	Pertag *pertag;
 	unsigned int seltags;
 	unsigned int sellt;
 	uint32_t tagset[2];
@@ -411,6 +413,14 @@ static Atom netatom[NetLast];
 /* attempt to encapsulate suck into one file */
 #include "client.h"
 
+struct Pertag {
+	unsigned int curtag, prevtag; /* current and previous tag */
+	int nmasters[tagcount + 1]; /* number of windows in master area */
+	float mfacts[tagcount + 1]; /* mfacts per tag */
+	unsigned int sellts[tagcount + 1]; /* selected layouts */
+	const Layout *ltidxs[tagcount + 1][2]; /* matrix of tags and layouts indexes  */
+};
+
 /* function implementations */
 void
 applybounds(Client *c, struct wlr_box *bbox)
@@ -959,6 +969,18 @@ createmon(struct wl_listener *listener, void *data)
 	m->fullscreen_bg = wlr_scene_rect_create(layers[LyrFS], 0, 0, fullscreen_bg);
 	wlr_scene_node_set_enabled(&m->fullscreen_bg->node, 0);
 
+	m->pertag = calloc(1, sizeof(Pertag));
+	m->pertag->curtag = m->pertag->prevtag = 1;
+
+	for (i = 0; i <= tagcount; i++) {
+		m->pertag->nmasters[i] = m->nmaster;
+		m->pertag->mfacts[i] = m->mfact;
+
+		m->pertag->ltidxs[i][0] = m->lt[0];
+		m->pertag->ltidxs[i][1] = m->lt[1];
+		m->pertag->sellts[i] = m->sellt;
+	}
+
 	/* Adds this to the output layout in the order it was configured in.
 	 *
 	 * The output layout utility automatically adds a wl_output global to the
@@ -1330,7 +1352,7 @@ incnmaster(const Arg *arg)
 {
 	if (!arg || !selmon)
 		return;
-	selmon->nmaster = MAX(selmon->nmaster + arg->i, 0);
+	selmon->nmaster = selmon->pertag->nmasters[selmon->pertag->curtag] = MAX(selmon->nmaster + arg->i, 0);
 	arrange(selmon);
 }
 
@@ -2046,9 +2068,9 @@ setlayout(const Arg *arg)
 	if (!selmon)
 		return;
 	if (!arg || !arg->v || arg->v != selmon->lt[selmon->sellt])
-		selmon->sellt ^= 1;
+		selmon->sellt = selmon->pertag->sellts[selmon->pertag->curtag] ^= 1;
 	if (arg && arg->v)
-		selmon->lt[selmon->sellt] = (Layout *)arg->v;
+		selmon->lt[selmon->sellt] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt] = (Layout *)arg->v;
 	strncpy(selmon->ltsymbol, selmon->lt[selmon->sellt]->symbol, LENGTH(selmon->ltsymbol));
 	arrange(selmon);
 	printstatus();
@@ -2065,7 +2087,7 @@ setmfact(const Arg *arg)
 	f = arg->f < 1.0 ? arg->f + selmon->mfact : arg->f - 1.0;
 	if (f < 0.1 || f > 0.9)
 		return;
-	selmon->mfact = f;
+	selmon->mfact = selmon->pertag->mfacts[selmon->pertag->curtag] = f;
 	arrange(selmon);
 }
 
@@ -2426,9 +2448,31 @@ void
 toggleview(const Arg *arg)
 {
 	uint32_t newtagset = selmon ? selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK) : 0;
+	size_t i;
+
 
 	if (newtagset) {
 		selmon->tagset[selmon->seltags] = newtagset;
+
+		if (newtagset == ~0) {
+			selmon->pertag->prevtag = selmon->pertag->curtag;
+			selmon->pertag->curtag = 0;
+		}
+
+		/* test if the user did not select the same tag */
+		if (!(newtagset & 1 << (selmon->pertag->curtag - 1))) {
+			selmon->pertag->prevtag = selmon->pertag->curtag;
+			for (i = 0; !(newtagset & 1 << i); i++) ;
+			selmon->pertag->curtag = i + 1;
+		}
+
+		/* apply settings for this view */
+		selmon->nmaster = selmon->pertag->nmasters[selmon->pertag->curtag];
+		selmon->mfact = selmon->pertag->mfacts[selmon->pertag->curtag];
+		selmon->sellt = selmon->pertag->sellts[selmon->pertag->curtag];
+		selmon->lt[selmon->sellt] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt];
+		selmon->lt[selmon->sellt^1] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt^1];
+
 		focusclient(focustop(selmon), 1);
 		arrange(selmon);
 	}
@@ -2594,11 +2638,36 @@ urgent(struct wl_listener *listener, void *data)
 void
 view(const Arg *arg)
 {
+	size_t i, tmptag;
+
 	if (!selmon || (arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
 		return;
+
+	if ((arg->ui & TAGMASK) == selmon->tagset[selmon->seltags])
+
 	selmon->seltags ^= 1; /* toggle sel tagset */
-	if (arg->ui & TAGMASK)
+	if (arg->ui & TAGMASK) {
 		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
+		selmon->pertag->prevtag = selmon->pertag->curtag;
+
+		if (arg->ui == ~0)
+			selmon->pertag->curtag = 0;
+		else {
+			for (i = 0; !(arg->ui & 1 << i); i++) ;
+			selmon->pertag->curtag = i + 1;
+		}
+	} else {
+		tmptag = selmon->pertag->prevtag;
+		selmon->pertag->prevtag = selmon->pertag->curtag;
+		selmon->pertag->curtag = tmptag;
+	}
+
+	selmon->nmaster = selmon->pertag->nmasters[selmon->pertag->curtag];
+	selmon->mfact = selmon->pertag->mfacts[selmon->pertag->curtag];
+	selmon->sellt = selmon->pertag->sellts[selmon->pertag->curtag];
+	selmon->lt[selmon->sellt] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt];
+	selmon->lt[selmon->sellt^1] = selmon->pertag->ltidxs[selmon->pertag->curtag][selmon->sellt^1];
+
 	focusclient(focustop(selmon), 1);
 	arrange(selmon);
 	printstatus();