makes layout, mwfact and nmaster individual for every tag

inspiration: https://github.com/djpohly/dwl/wiki/pertag

dwl.c

@@ -103,6 +103,7 @@ typedef struct {
 	const Arg arg;
 } Button;
 
+typedef struct Pertag Pertag;
 typedef struct Monitor Monitor;
 typedef struct {
 	/* Must keep these three elements in this order */
@@ -200,6 +201,7 @@ 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];
@@ -432,6 +434,14 @@ static xcb_atom_t 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)
@@ -720,6 +730,7 @@ cleanupmon(struct wl_listener *listener, void *data)
 	wlr_output_layout_remove(output_layout, m->wlr_output);
 	wlr_scene_output_destroy(m->scene_output);
 
+	free(m->pertag);
 	closemon(m);
 	wlr_scene_node_destroy(&m->fullscreen_bg->node);
 	free(m);
@@ -1025,6 +1036,18 @@ 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 <= 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;
+	}
+
 	/* The xdg-protocol specifies:
 	 *
 	 * If the fullscreened surface is not opaque, the compositor must make
@@ -1520,7 +1543,7 @@ 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);
 }
 
@@ -2358,9 +2381,9 @@ 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();
@@ -2377,7 +2400,7 @@ setmfact(const Arg *arg)
 	f = arg->f < 1.0f ? arg->f + selmon->mfact : arg->f - 1.0f;
 	if (f < 0.1 || f > 0.9)
 		return;
-	selmon->mfact = f;
+	selmon->mfact = selmon->pertag->mfacts[selmon->pertag->curtag] = f;
 	arrange(selmon);
 }
 
@@ -2757,9 +2780,29 @@ void
 toggleview(const Arg *arg)
 {
 	uint32_t newtagset;
+	size_t i;
 	if (!(newtagset = selmon ? selmon->tagset[selmon->seltags] ^ (arg->ui & TAGMASK) : 0))
 		return;
 
+	if (newtagset == (uint32_t)~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];
+
 	selmon->tagset[selmon->seltags] = newtagset;
 	focusclient(focustop(selmon), 1);
 	arrange(selmon);
@@ -2948,11 +2991,33 @@ 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 & ~0) {
 		selmon->tagset[selmon->seltags] = arg->ui & TAGMASK;
+		selmon->pertag->prevtag = selmon->pertag->curtag;
+
+		if (arg->ui == TAGMASK)
+			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();