Add push* keybinds

Signed-off-by: Leonardo Hernández Hernández <leohdz172@proton.me>

config.def.h

@@ -167,7 +167,9 @@ static const Key keys[] = {
 	/* window management */
 	{ MODKEY,                    XKB_KEY_b,          togglebar,      {0} },
 	{ MODKEY,                    XKB_KEY_j,          focusstack,     {.i = +1} },
+	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_J,          pushdown,       {0} },
 	{ MODKEY,                    XKB_KEY_k,          focusstack,     {.i = -1} },
+	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_K,          pushup,         {0} },
 	{ MODKEY,                    XKB_KEY_i,          incnmaster,     {.i = +1} },
 	{ MODKEY,                    XKB_KEY_d,          incnmaster,     {.i = -1} },
 	{ MODKEY,                    XKB_KEY_h,          setmfact,       {.f = -0.05f} },

dwl.c

@@ -388,6 +388,12 @@ static void zoom(const Arg *arg);
 static void bstack(Monitor *m);
 static void bstackhoriz(Monitor *m);
 
+/* push */
+static Client *nexttiled(Client *sel);
+static Client *prevtiled(Client *sel);
+static void pushdown(const Arg *arg);
+static void pushup(const Arg *arg);
+
 /* variables */
 static const char broken[] = "broken";
 static pid_t child_pid = -1;
@@ -3755,3 +3761,67 @@ bstackhoriz(Monitor *m) {
 		i++;
 	}
 }
+
+static Client *
+nexttiled(Client *sel) {
+	Client *c;
+	wl_list_for_each(c, &sel->link, link) {
+		if (&c->link == &clients)
+			break;  /* don't wrap */
+		if (!c->isfloating && VISIBLEON(c, selmon))
+			return c;
+	}
+	return NULL;
+}
+
+static Client *
+prevtiled(Client *sel) {
+	Client *c;
+	wl_list_for_each_reverse(c, &sel->link, link) {
+		if (&c->link == &clients)
+			break;  /* don't wrap */
+		if (!c->isfloating && VISIBLEON(c, selmon))
+			return c;
+	}
+	return NULL;
+}
+
+static void
+pushup(const Arg *arg) {
+	Client *sel = focustop(selmon);
+	Client *c;
+
+	if(!sel || sel->isfloating)
+		return;
+	if((c = prevtiled(sel))) {
+		/* attach before c */
+		wl_list_remove(&sel->link);
+		wl_list_insert(c->link.prev, &sel->link);
+	} else {
+		/* move to the end */
+		wl_list_remove(&sel->link);
+		wl_list_insert(clients.prev, &sel->link);
+	}
+	focusclient(sel, 1);
+	arrange(selmon);
+}
+
+static void
+pushdown(const Arg *arg) {
+	Client *sel = focustop(selmon);
+	Client *c;
+
+	if(!sel || sel->isfloating)
+		return;
+	if((c = nexttiled(sel))) {
+		/* attach after c */
+		wl_list_remove(&sel->link);
+		wl_list_insert(&c->link, &sel->link);
+	} else {
+		/* move to the front */
+		wl_list_remove(&sel->link);
+		wl_list_insert(&clients, &sel->link);
+	}
+	focusclient(sel, 1);
+	arrange(selmon);
+}