From 1067de190423e605d68817d70b282262659eb727 Mon Sep 17 00:00:00 2001
From: Johannes Herman <johannes.herman@gmail.com>
Date: Mon, 28 Jul 2025 19:40:38 +0200
Subject: snail layout

---
 dwl.c | 119 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)

(limited to 'dwl.c')

diff --git a/dwl.c b/dwl.c
index 4617c20..93a9631 100644
--- a/dwl.c
+++ b/dwl.c
@@ -334,6 +334,7 @@ static void setmon(Client *c, Monitor *m, uint32_t newtags);
 static void setpsel(struct wl_listener *listener, void *data);
 static void setsel(struct wl_listener *listener, void *data);
 static void setup(void);
+static void snail(Monitor *m);
 static void spawn(const Arg *arg);
 static void startdrag(struct wl_listener *listener, void *data);
 static void tag(const Arg *arg);
@@ -2661,6 +2662,124 @@ setup(void)
 #endif
 }
 
+void
+snail(Monitor *m)
+{
+	int i = 0, n = 0;
+	unsigned int mw = m->w.width, draw_borders = 1, e = m->gaps, w = 0, h = 0, egappx = 0;
+	Client *c, *prev = NULL;
+	enum wlr_direction dir = WLR_DIRECTION_RIGHT;
+
+	wl_list_for_each(c, &clients, link)
+		if (VISIBLEON(c, m) && !c->isfloating && !c->isfullscreen)
+			n++;
+	if (n == 0)
+		return;
+
+	if (smartgaps == n)
+		e = 0;
+	egappx = e * gappx;
+
+	if (n == smartborders)
+		draw_borders = 0;
+
+	if (n > m->nmaster)
+		mw = m->nmaster ? (unsigned int)round((m->w.width + egappx) * m->mfact) : 0;
+
+	wl_list_for_each(c, &clients, link) {
+		if (!VISIBLEON(c, m) || c->isfloating || c->isfullscreen)
+			continue;
+
+		/*
+		 * If the master area exists and this is the first window, fill the
+		 * master area with this window
+		 */
+		if (mw > 0 && i == 0) {
+			c->geom = (struct wlr_box){.x = m->w.x + egappx, .y = m->w.y + egappx,
+				.width = mw - 2*egappx, .height = m->w.height - 2*egappx};
+			/*
+			 * If the first window in the master area is wide, split it
+			 * horizontally and put next one on its right; otherwise, split it
+			 * vertically and put the next one below it
+			 */
+			dir = c->geom.width > m->w.height ? WLR_DIRECTION_RIGHT : WLR_DIRECTION_DOWN;
+		/*
+		 * If the master area is full or doesn't exist, fill the stack with the
+		 * m->nmaster-th window
+		 */
+		} else if (i == m->nmaster) {
+			c->geom = (struct wlr_box){.x = m->w.x + mw + egappx, .y = m->w.y + egappx,
+				.width = m->w.width - mw - 2*egappx, .height = m->w.height - 2*egappx};
+			/*
+			 * If the first window in the stack is wide, split it horizontally
+			 * and put next one on its right; otherwise, split it vertically and
+			 * put the next one below it
+			 */
+			dir = c->geom.width > m->w.height ? WLR_DIRECTION_RIGHT : WLR_DIRECTION_DOWN;
+		} else if (prev) {
+			/*
+			 * Split the previous horizontally and put the current window on the right
+			 */
+			if (dir == WLR_DIRECTION_RIGHT) {
+				w = prev->geom.width / 2 - egappx;
+				h = prev->geom.height;
+				c->geom = (struct wlr_box){.x = prev->geom.x + prev->geom.width / 2 + egappx, .y = prev->geom.y,
+					.width = w, .height = h};
+				prev->geom = (struct wlr_box){.x = prev->geom.x, .y = prev->geom.y,
+					.width = w, .height = h};
+				/*
+				 * If it's a stack window or the first narrow window in the master
+				 * area, put the next one below it
+				 */
+				if (i >= m->nmaster || c->geom.width < m->w.height)
+					dir = WLR_DIRECTION_DOWN;
+			/*
+			 * Split the previous vertically and put the current window below it
+			 */
+			} else if (dir == WLR_DIRECTION_DOWN) {
+				w = prev->geom.width;
+				h = prev->geom.height / 2 - egappx;
+				c->geom = (struct wlr_box){.x = prev->geom.x, .y = prev->geom.y + prev->geom.height / 2 + egappx,
+					.width = w, .height = h};
+				prev->geom = (struct wlr_box){.x = prev->geom.x, .y = prev->geom.y,
+					.width = w, .height = h};
+				dir = WLR_DIRECTION_LEFT;
+			/*
+			 * Split the previous horizontally and put the current window on the left
+			 */
+			} else if (dir == WLR_DIRECTION_LEFT) {
+				w = prev->geom.width / 2 - egappx;
+				h = prev->geom.height;
+				c->geom = (struct wlr_box){.x = prev->geom.x, .y = prev->geom.y,
+					.width = w, .height = h};
+				prev->geom = (struct wlr_box){.x = prev->geom.x + prev->geom.width / 2 + egappx, .y = prev->geom.y,
+					.width = w, .height = h};
+				dir = WLR_DIRECTION_UP;
+			/*
+			 * Split the previous vertically and put the current window above it
+			 */
+			} else {
+				w = prev->geom.width;
+				h = prev->geom.height / 2 - egappx;
+				c->geom = (struct wlr_box){.x = prev->geom.x, .y = prev->geom.y,
+					.width = w, .height = h};
+				prev->geom = (struct wlr_box){.x = prev->geom.x, .y = prev->geom.y + prev->geom.height / 2 + egappx,
+					.width = w, .height = h};
+				dir = WLR_DIRECTION_RIGHT;
+			}
+		}
+		i++;
+		prev = c;
+	}
+
+	wl_list_for_each(c, &clients, link) {
+		if (!VISIBLEON(c, m) || c->isfloating || c->isfullscreen)
+			continue;
+
+		resize(c, c->geom, 0, draw_borders);
+	}
+}
+
 void
 spawn(const Arg *arg)
 {
-- 
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