Add ability to swap windows around in the stack

2 files changed, 52 insertions, 0 deletions

diff --git a/config.def.h b/config.def.h
index 7a5d203..e09d20d 100644
--- a/config.def.h
+++ b/config.def.h
@@ -73,6 +73,8 @@ static Key keys[] = {
 	{ MODKEY,                       XK_b,      togglebar,      {0} },
 	{ MODKEY,                       XK_j,      focusstack,     {.i = +1 } },
 	{ MODKEY,                       XK_k,      focusstack,     {.i = -1 } },
+	{ MODKEY|ShiftMask,             XK_j,      movestack,      {.i = +1 } },
+	{ MODKEY|ShiftMask,             XK_k,      movestack,      {.i = -1 } },
 	{ 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 bb9cf1d..fbb7011 100644
--- a/dwm.c
+++ b/dwm.c
@@ -192,6 +192,7 @@ static void maprequest(XEvent *e);
 static void monocle(Monitor *m);
 static void motionnotify(XEvent *e);
 static void movemouse(const Arg *arg);
+static void movestack(const Arg *arg);
 static Client *nexttagged(Client *c);
 static Client *nexttiled(Client *c);
 static void pop(Client *);
@@ -1283,6 +1284,55 @@ movemouse(const Arg *arg)
 	}
 }
 
+void
+movestack(const Arg *arg) {
+	Client *c = NULL, *p = NULL, *pc = NULL, *i;
+
+	if(arg->i > 0) {
+		/* find the client after selmon->sel */
+		for(c = selmon->sel->next; c && (!ISVISIBLE(c) || c->isfloating); c = c->next);
+		if(!c)
+			for(c = selmon->clients; c && (!ISVISIBLE(c) || c->isfloating); c = c->next);
+
+	}
+	else {
+		/* find the client before selmon->sel */
+		for(i = selmon->clients; i != selmon->sel; i = i->next)
+			if(ISVISIBLE(i) && !i->isfloating)
+				c = i;
+		if(!c)
+			for(; i; i = i->next)
+				if(ISVISIBLE(i) && !i->isfloating)
+					c = i;
+	}
+	/* find the client before selmon->sel and c */
+	for(i = selmon->clients; i && (!p || !pc); i = i->next) {
+		if(i->next == selmon->sel)
+			p = i;
+		if(i->next == c)
+			pc = i;
+	}
+
+	/* swap c and selmon->sel selmon->clients in the selmon->clients list */
+	if(c && c != selmon->sel) {
+		Client *temp = selmon->sel->next==c?selmon->sel:selmon->sel->next;
+		selmon->sel->next = c->next==selmon->sel?c:c->next;
+		c->next = temp;
+
+		if(p && p != c)
+			p->next = c;
+		if(pc && pc != selmon->sel)
+			pc->next = selmon->sel;
+
+		if(selmon->sel == selmon->clients)
+			selmon->clients = c;
+		else if(c == selmon->clients)
+			selmon->clients = selmon->sel;
+
+		arrange(selmon);
+	}
+}
+
 Client *
 nexttagged(Client *c) {
 	Client *walked = c->mon->clients;