patch: gridmode

This patch adds an extra layout mode to dwm called grid in which the
windows are arranged in a grid of equal sizes. It comes in very handy,
especially with tools that operate on multiple windows at once; e.g.
Cluster SSH.

The patch would look a lot uglier without Jukka Salmi's constant help.
Thanks Jukka :-)

2 files changed, 31 insertions, 0 deletions

diff --git a/config.def.h b/config.def.h
index def5e8b..2b319cf 100644
--- a/config.def.h
+++ b/config.def.h
@@ -52,6 +52,7 @@ static const Layout layouts[] = {
 	{ "|M|",      centeredmaster },
 	{ "||=",      col },
 	{ "=[]",      elit },
+	{ "HHH",      grid },
 };
 
 /* key definitions */
@@ -102,6 +103,7 @@ static const Key keys[] = {
 	{ MODKEY,                       XK_u,      setlayout,      {.v = &layouts[3]} },
 	{ MODKEY,                       XK_o,      setlayout,      {.v = &layouts[4]} },
 	{ MODKEY,                       XK_e,      setlayout,      {.v = &layouts[5]} },
+	{ MODKEY,                       XK_g,      setlayout,      {.v = &layouts[6]} },
 	{ MODKEY,                       XK_comma,  focusmon,       {.i = -1 } },
 	{ MODKEY,                       XK_period, focusmon,       {.i = +1 } },
 	{ MODKEY|ShiftMask,             XK_comma,  tagmon,         {.i = -1 } },
diff --git a/dwm.c b/dwm.c
index 33f83cf..ddef5a6 100644
--- a/dwm.c
+++ b/dwm.c
@@ -244,6 +244,7 @@ static int xerrorstart(Display *dpy, XErrorEvent *ee);
 static void xinitvisual();
 static void zoom(const Arg *arg);
 static void centeredmaster(Monitor *m);
+static void grid(Monitor *m);
 
 /* variables */
 static const char broken[] = "broken";
@@ -2397,3 +2398,31 @@ centeredmaster(Monitor *m)
 		}
 	}
 }
+
+void
+grid(Monitor *m) {
+	unsigned int i, n, cx, cy, cw, ch, aw, ah, cols, rows;
+	Client *c;
+
+	for(n = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next))
+		n++;
+
+	/* grid dimensions */
+	for(rows = 0; rows <= n/2; rows++)
+		if(rows*rows >= n)
+			break;
+	cols = (rows && (rows - 1) * rows >= n) ? rows - 1 : rows;
+
+	/* window geoms (cell height/width) */
+	ch = m->wh / (rows ? rows : 1);
+	cw = m->ww / (cols ? cols : 1);
+	for(i = 0, c = nexttiled(m->clients); c; c = nexttiled(c->next)) {
+		cx = m->wx + (i / rows) * cw;
+		cy = m->wy + (i % rows) * ch;
+		/* adjust height/width of last row/column's windows */
+		ah = ((i + 1) % rows == 0) ? m->wh - ch * rows : 0;
+		aw = (i >= rows * (cols - 1)) ? m->ww - cw * cols : 0;
+		resize(c, cx, cy, cw - 2 * c->bw + aw, ch - 2 * c->bw + ah, False);
+		i++;
+	}
+}