From eee865367a7903abeffd652ed293c090717294de Mon Sep 17 00:00:00 2001
From: bakkeby <bakkeby@gmail.com>
Date: Mon, 19 Oct 2020 17:37:59 +0200
Subject: [PATCH] focusdir: focus on the next client by direction (up, down,
 left, right)

---
 config.def.h |  4 ++++
 dwm.c        | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+)

diff --git a/config.def.h b/config.def.h
index 1c0b587..6bcce07 100644
--- a/config.def.h
+++ b/config.def.h
@@ -66,6 +66,10 @@ static Key keys[] = {
 	{ MODKEY,                       XK_b,      togglebar,      {0} },
 	{ MODKEY,                       XK_j,      focusstack,     {.i = +1 } },
 	{ MODKEY,                       XK_k,      focusstack,     {.i = -1 } },
+	{ MODKEY,                       XK_Left,   focusdir,       {.i = 0 } }, // left
+	{ MODKEY,                       XK_Right,  focusdir,       {.i = 1 } }, // right
+	{ MODKEY,                       XK_Up,     focusdir,       {.i = 2 } }, // up
+	{ MODKEY,                       XK_Down,   focusdir,       {.i = 3 } }, // down
 	{ MODKEY,                       XK_i,      incnmaster,     {.i = +1 } },
 	{ MODKEY,                       XK_d,      incnmaster,     {.i = -1 } },
 	{ MODKEY,                       XK_h,      setmfact,       {.f = -0.05} },
diff --git a/dwm.c b/dwm.c
index 4465af1..c4b5995 100644
--- a/dwm.c
+++ b/dwm.c
@@ -166,6 +166,7 @@ static void drawbars(void);
 static void enternotify(XEvent *e);
 static void expose(XEvent *e);
 static void focus(Client *c);
+static void focusdir(const Arg *arg);
 static void focusin(XEvent *e);
 static void focusmon(const Arg *arg);
 static void focusstack(const Arg *arg);
@@ -805,6 +806,72 @@ focus(Client *c)
 	drawbars();
 }
 
+void
+focusdir(const Arg *arg)
+{
+	Client *s = selmon->sel, *f = NULL, *c, *next;
+
+	if (!s)
+		return;
+
+	unsigned int score = -1;
+	unsigned int client_score;
+	int dist;
+	int dirweight = 20;
+	int isfloating = s->isfloating;
+
+	next = s->next;
+	if (!next)
+		next = s->mon->clients;
+	for (c = next; c != s; c = next) {
+
+		next = c->next;
+		if (!next)
+			next = s->mon->clients;
+
+		if (!ISVISIBLE(c) || c->isfloating != isfloating) // || HIDDEN(c)
+			continue;
+
+		switch (arg->i) {
+		case 0: // left
+			dist = s->x - c->x - c->w;
+			client_score =
+				dirweight * MIN(abs(dist), abs(dist + s->mon->ww)) +
+				abs(s->y - c->y);
+			break;
+		case 1: // right
+			dist = c->x - s->x - s->w;
+			client_score =
+				dirweight * MIN(abs(dist), abs(dist + s->mon->ww)) +
+				abs(c->y - s->y);
+			break;
+		case 2: // up
+			dist = s->y - c->y - c->h;
+			client_score =
+				dirweight * MIN(abs(dist), abs(dist + s->mon->wh)) +
+				abs(s->x - c->x);
+			break;
+		default:
+		case 3: // down
+			dist = c->y - s->y - s->h;
+			client_score =
+				dirweight * MIN(abs(dist), abs(dist + s->mon->wh)) +
+				abs(c->x - s->x);
+			break;
+		}
+
+		if (((arg->i == 0 || arg->i == 2) && client_score <= score) || client_score < score) {
+			score = client_score;
+			f = c;
+		}
+	}
+
+	if (f && f != s) {
+		focus(f);
+		restack(f->mon);
+	}
+}
+
 /* there are some broken focus acquiring clients needing extra handling */
 void
 focusin(XEvent *e)
-- 
2.19.1