add swapfocus patch

patches/swapfocus/README.md

@@ -0,0 +1,8 @@
+### Description
+Swapfocus adds a new function on dwl: a shortcut to change the focus to the last focused window. If the last focused window is in another tag, then the focus will change to that tag.
+
+### Download
+- [v0.8](https://codeberg.org/dwl/dwl-patches/raw/branch/main/patches/swapfocus/swapfocus.patch)
+
+### Authors
+- [André Desgualdo Pereira](https://codeberg.org/Kana)

patches/swapfocus/swapfocus.patch

@@ -0,0 +1,109 @@
+From 34c613a77683ab0e2beac36276315d037ba222a5 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Andr=C3=A9=20Desgualdo=20Pereira?= <desgua@gmail.com>
+Date: Thu, 30 Apr 2026 13:36:03 -0300
+Subject: [PATCH] add swapfocus patch
+
+---
+ config.def.h |  1 +
+ dwl.c        | 45 +++++++++++++++++++++++++++++++++++++++++++++
+ 2 files changed, 46 insertions(+)
+
+diff --git a/config.def.h b/config.def.h
+index 8a6eda0..23e502d 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -132,6 +132,7 @@ static const Key keys[] = {
+ 	{ MODKEY,                    XKB_KEY_Return,      zoom,             {0} },
+ 	{ MODKEY,                    XKB_KEY_Tab,         view,             {0} },
+ 	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_c,           killclient,       {0} },
++	{ MODKEY,                    XKB_KEY_s,           swapfocus,        {0} },
+ 	{ MODKEY,                    XKB_KEY_t,           setlayout,        {.v = &layouts[0]} },
+ 	{ MODKEY,                    XKB_KEY_f,           setlayout,        {.v = &layouts[1]} },
+ 	{ MODKEY,                    XKB_KEY_m,           setlayout,        {.v = &layouts[2]} },
+diff --git a/dwl.c b/dwl.c
+index 101a45f..dac34a6 100644
+--- a/dwl.c
++++ b/dwl.c
+@@ -332,6 +332,7 @@ static void setsel(struct wl_listener *listener, void *data);
+ static void setup(void);
+ static void spawn(const Arg *arg);
+ static void startdrag(struct wl_listener *listener, void *data);
++static void swapfocus(const Arg *arg);
+ static void tag(const Arg *arg);
+ static void tagmon(const Arg *arg);
+ static void tile(Monitor *m);
+@@ -375,6 +376,7 @@ static struct wlr_xdg_activation_v1 *activation;
+ static struct wlr_xdg_decoration_manager_v1 *xdg_decoration_mgr;
+ static struct wl_list clients; /* tiling order */
+ static struct wl_list fstack;  /* focus order */
++static Client *prevclient = NULL;
+ static struct wlr_idle_notifier_v1 *idle_notifier;
+ static struct wlr_idle_inhibit_manager_v1 *idle_inhibit_mgr;
+ static struct wlr_layer_shell_v1 *layer_shell;
+@@ -1330,6 +1332,8 @@ destroynotify(struct wl_listener *listener, void *data)
+ {
+ 	/* Called when the xdg_toplevel is destroyed. */
+ 	Client *c = wl_container_of(listener, c, destroy);
++	if (c == prevclient)
++		prevclient = NULL;
+ 	wl_list_remove(&c->destroy.link);
+ 	wl_list_remove(&c->set_title.link);
+ 	wl_list_remove(&c->fullscreen.link);
+@@ -1424,6 +1428,11 @@ focusclient(Client *c, int lift)
+ 			wlr_xdg_popup_destroy(popup);
+ 	}
+ 
++	/* Capture the client losing focus as the previous client */
++	if (old_c && !client_is_unmanaged(old_c) && old_c != c) {
++		prevclient = old_c;
++	}
++
+ 	/* Put the new client atop the focus stack and select its monitor */
+ 	if (c && !client_is_unmanaged(c)) {
+ 		wl_list_remove(&c->flink);
+@@ -2679,6 +2688,42 @@ spawn(const Arg *arg)
+ 	}
+ }
+ 
++void
++swapfocus(const Arg *arg)
++{
++	Client *c;
++	int found = 0;
++
++	if (!prevclient)
++		return;
++
++	/* Verify the client still exists in the list of managed windows */
++	wl_list_for_each(c, &clients, link) {
++		if (c == prevclient) {
++			found = 1;
++			break;
++		}
++	}
++
++	if (found && !client_is_unmanaged(prevclient)) {
++		/* Get the bitmask of currently visible tags on the prevclient's monitor */
++		unsigned int visible_tags = prevclient->mon->tagset[prevclient->mon->seltags];
++
++		/* Check if the client's tags are currently visible */
++		if (!(prevclient->tags & visible_tags)) {
++			/* Tag is NOT visible: Switch tags and monitor only.
++			 * dwl's view() calls arrange(), which automatically focuses the 
++			 * top-most window in the focus stack for that tag. */
++			Arg a = {.ui = prevclient->tags};
++			selmon = prevclient->mon;
++			view(&a);
++		} else {
++			/* Tag IS visible: Just swap focus within the same view */
++			focusclient(prevclient, 1);
++		}
++	}
++}
++
+ void
+ startdrag(struct wl_listener *listener, void *data)
+ {
+-- 
+2.53.0
+