From 38427b81367e8b4d2aad708a1d463bc793aac65e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Desgualdo=20Pereira?= <desgua@gmail.com>
Date: Fri, 31 Oct 2025 15:46:48 -0300
Subject: [PATCH] take on gaplessgrid and fix minor indentation and typos

---
 config.def.h |  2 ++
 dwl.c        | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)

diff --git a/config.def.h b/config.def.h
index 95c2afa..2054107 100644
--- a/config.def.h
+++ b/config.def.h
@@ -34,6 +34,7 @@ static const Layout layouts[] = {
 	{ "[]=",      tile },
 	{ "><>",      NULL },    /* no layout function means floating behavior */
 	{ "[M]",      monocle },
+	{ "###",      gaplessgrid },
 };
 
 /* monitors */
@@ -139,6 +140,7 @@ static const Key keys[] = {
 	{ MODKEY,                    XKB_KEY_t,          setlayout,      {.v = &layouts[0]} },
 	{ MODKEY,                    XKB_KEY_f,          setlayout,      {.v = &layouts[1]} },
 	{ MODKEY,                    XKB_KEY_m,          setlayout,      {.v = &layouts[2]} },
+	{ MODKEY,                    XKB_KEY_g,          setlayout,      {.v = &layouts[3]} },
 	{ MODKEY,                    XKB_KEY_space,      setlayout,      {0} },
 	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_space,      togglefloating, {0} },
 	{ MODKEY,                    XKB_KEY_e,         togglefullscreen, {0} },
diff --git a/dwl.c b/dwl.c
index 12f441e..7ab5323 100644
--- a/dwl.c
+++ b/dwl.c
@@ -288,6 +288,7 @@ static void focusstack(const Arg *arg);
 static Client *focustop(Monitor *m);
 static void fullscreennotify(struct wl_listener *listener, void *data);
 static void gpureset(struct wl_listener *listener, void *data);
+static void gaplessgrid(Monitor *m);
 static void handlesig(int signo);
 static void incnmaster(const Arg *arg);
 static void inputdevice(struct wl_listener *listener, void *data);
@@ -1566,6 +1567,56 @@ handlesig(int signo)
 		quit(NULL);
 }
 
+void
+gaplessgrid(Monitor *m)
+{
+	int n = 0, i = 0, ch, cw, cn, rn, rows, cols;
+	Client *c;
+
+	wl_list_for_each(c, &clients, link)
+		if (VISIBLEON(c, m) && !c->isfloating)
+			n++;
+	if (n == 0)
+		return;
+
+	/* grid dimensions */
+	for (cols = 0; cols <= (n / 2); cols++)
+		if ((cols * cols) >= n)
+			break;
+
+	if (n == 5) /* set layout against the general calculation: not 1:2:2, but 2:3 */
+		cols = 2;
+
+	/* widescreen is better if 3 columns */
+	if (n >= 3 && n <= 6 && (m->w.width / m->w.height) > 1)
+		cols = 3;
+
+	rows = n / cols;
+
+	/* window geometries */
+	cw = cols ? m->w.width / cols : m->w.width;
+	cn = 0; /* current column number */
+	rn = 0; /* current row number */
+	wl_list_for_each(c, &clients, link) {
+		unsigned int cx, cy;
+		if (!VISIBLEON(c, m) || c->isfloating || c->isfullscreen)
+			continue;
+
+		if ((i / rows + 1) > (cols - n % cols))
+			rows = n / cols + 1;
+		ch = rows ? m->w.height / rows : m->w.height;
+		cx = m->w.x + cn * cw;
+		cy = m->w.y + rn * ch;
+		resize(c, (struct wlr_box) { cx, cy, cw, ch}, 0);
+		rn++;
+		if (rn >= rows) {
+			rn = 0;
+			cn++;
+		}
+		i++;
+	}
+}
+
 void
 incnmaster(const Arg *arg)
 {
-- 
2.51.0