From 52dbf2ca1507269447c4716502e313788b66135b Mon Sep 17 00:00:00 2001
From: Benjamin Chausse <benjamin@chausse.xyz>
Date: Mon, 22 Jul 2024 23:42:31 -0400
Subject: Implement togglekblayoutandoptions patch

https://codeberg.org/dwl/dwl-patches/src/branch/main/patches/togglekblayoutandoptions
---
 config.def.h | 16 ++++++++++------
 dwl.c        | 23 ++++++++++++++++++++++-
 2 files changed, 32 insertions(+), 7 deletions(-)

diff --git a/config.def.h b/config.def.h
index 22d2171..1f00009 100644
--- a/config.def.h
+++ b/config.def.h
@@ -52,12 +52,15 @@ static const MonitorRule monrules[] = {
 };
 
 /* keyboard */
-static const struct xkb_rule_names xkb_rules = {
-	/* can specify fields: rules, model, layout, variant, options */
-	/* example:
-	.options = "ctrl:nocaps",
-	*/
-	.options = NULL,
+static const struct xkb_rule_names xkb_rules[] = {
+	{
+		.layout = "us"
+	},
+	/*{
+		.layout = "us",
+		.variant = "dvp",
+		.options = "compose:102,numpad:shift3,kpdl:semi,keypad:atm,caps:super"
+	}*/
 };
 
 static const int repeat_rate = 25;
@@ -148,6 +151,7 @@ static const Key keys[] = {
 	{ MODKEY,                    XKB_KEY_period,     focusmon,       {.i = WLR_DIRECTION_RIGHT} },
 	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_less,       tagmon,         {.i = WLR_DIRECTION_LEFT} },
 	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_greater,    tagmon,         {.i = WLR_DIRECTION_RIGHT} },
+	{ MODKEY|WLR_MODIFIER_SHIFT, XKB_KEY_A,          incxkbrules,    {.i = +1} },
 	TAGKEYS(          XKB_KEY_1, XKB_KEY_exclam,                     0),
 	TAGKEYS(          XKB_KEY_2, XKB_KEY_at,                         1),
 	TAGKEYS(          XKB_KEY_3, XKB_KEY_numbersign,                 2),
diff --git a/dwl.c b/dwl.c
index 5bf995e..9b6b7b7 100644
--- a/dwl.c
+++ b/dwl.c
@@ -335,6 +335,7 @@ 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 incxkbrules(const Arg *arg);
 static void tag(const Arg *arg);
 static void tagmon(const Arg *arg);
 static void tile(Monitor *m);
@@ -404,6 +405,7 @@ static struct wl_listener lock_listener = {.notify = locksession};
 
 static struct wlr_seat *seat;
 static KeyboardGroup *kb_group;
+static unsigned int kblayout = 0;
 static unsigned int cursor_mode;
 static Client *grabc;
 static int grabcx, grabcy; /* client-relative */
@@ -890,7 +892,7 @@ createkeyboardgroup(void)
 
 	/* Prepare an XKB keymap and assign it to the keyboard group. */
 	context = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
-	if (!(keymap = xkb_keymap_new_from_names(context, &xkb_rules,
+	if (!(keymap = xkb_keymap_new_from_names(context, &xkb_rules[kblayout],
 				XKB_KEYMAP_COMPILE_NO_FLAGS)))
 		die("failed to compile keymap");
 
@@ -2666,6 +2668,25 @@ startdrag(struct wl_listener *listener, void *data)
 	LISTEN_STATIC(&drag->icon->events.destroy, destroydragicon);
 }
 
+void
+incxkbrules(const Arg *arg)
+{
+	KeyboardGroup *group;
+	struct wlr_keyboard_group *wlr_group;
+	const struct xkb_rule_names newrule = xkb_rules[(kblayout + 1) % LENGTH(xkb_rules)];
+
+	wl_list_for_each(group, &kb_group->link, link) {
+		wl_list_for_each(wlr_group, &group->wlr_group->keys, keys) {
+			struct xkb_context *context = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
+			struct xkb_keymap *keymap = xkb_map_new_from_names(context, &newrule,
+					XKB_KEYMAP_COMPILE_NO_FLAGS);
+			wlr_keyboard_set_keymap(&wlr_group->keyboard, keymap);
+			xkb_keymap_unref(keymap);
+			xkb_context_unref(context);
+		}
+	}
+}
+
 void
 tag(const Arg *arg)
 {
-- 
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