From 2d7aa598d57f3475e10cbc8d034f3f1bdfbe61ba Mon Sep 17 00:00:00 2001
From: speedie <speedie@duck.com>
Date: Tue, 6 Jun 2023 01:48:35 +0200
Subject: [PATCH] add pertag

---
 dwl.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 47 insertions(+), 3 deletions(-)

diff --git a/dwl.c b/dwl.c
index 50aba3c..299ec3b 100644
--- a/dwl.c
+++ b/dwl.c
@@ -95,6 +95,7 @@ typedef struct {
 	const Arg arg;
 } Button;
 
+typedef struct Pertag Pertag;
 typedef struct Monitor Monitor;
 typedef struct {
 	/* Must keep these three elements in this order */
@@ -188,6 +189,7 @@ 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;
 	unsigned int tagset[2];
@@ -427,6 +429,14 @@ static Atom netatom[NetLast];
 /* compile-time check if all tags fit into an unsigned int bit array. */
 struct NumTags { char limitexceeded[LENGTH(tags) > 31 ? -1 : 1]; };
 
+struct Pertag {
+	unsigned int curtag, prevtag; /* current and previous tag */
+	int nmasters[LENGTH(tags) + 1]; /* number of windows in master area */
+	float mfacts[LENGTH(tags) + 1]; /* mfacts per tag */
+	unsigned int sellts[LENGTH(tags) + 1]; /* selected layouts */
+	const Layout *ltidxs[LENGTH(tags) + 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)
 	wl_list_insert(&mons, &m->link);
 	printstatus();
 
+	m->pertag = calloc(1, sizeof(Pertag));
+	m->pertag->curtag = m->pertag->prevtag = 1;
+
+	for (i = 0; i <= LENGTH(tags); 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;
+	}
+
 	/* The xdg-protocol specifies:
 	 *
 	 * If the fullscreened surface is not opaque, the compositor must make
@@ -1494,7 +1516,7 @@ 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);
 }
 
@@ -2198,7 +2220,7 @@ 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);
 }
 
@@ -2720,11 +2742,33 @@ 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;
 	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();