dwl-patches/kblayout/kblayout.patch

From a0c758953fe0cbb20ea74d0acfa3e44b8173d12d Mon Sep 17 00:00:00 2001
From: ForzCross <forzcross@gmail.com>
Date: Sun, 21 Jan 2024 15:52:31 +0300
Subject: [PATCH] Add per client keyboard layout and status bar info

---
 config.def.h |  3 +++
 dwl.c        | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 67 insertions(+), 1 deletion(-)

diff --git a/config.def.h b/config.def.h
index 9009517..81bb10d 100644
--- a/config.def.h
+++ b/config.def.h
@@ -13,6 +13,9 @@ static const float focuscolor[]            = COLOR(0x005577ff);
 static const float urgentcolor[]           = COLOR(0xff0000ff);
 /* To conform the xdg-protocol, set the alpha to zero to restore the old behavior */
 static const float fullscreen_bg[]         = {0.1f, 0.1f, 0.1f, 1.0f}; /* You can also use glsl colors */
+/* keyboard layout change notification for status bar */
+static const char  kblayout_file[] = "/tmp/dwl-keymap";
+static const char *kblayout_cmd[]  = {"pkill", "-RTMIN+3", "someblocks", NULL};
 
 /* tagging - TAGCOUNT must be no greater than 31 */
 #define TAGCOUNT (9)
diff --git a/dwl.c b/dwl.c
index bf02a6d..17c8fa4 100644
--- a/dwl.c
+++ b/dwl.c
@@ -135,6 +135,7 @@ typedef struct {
 	uint32_t tags;
 	int isfloating, isurgent, isfullscreen;
 	uint32_t resize; /* configure serial of a pending resize */
+	xkb_layout_index_t layout_idx;
 } Client;
 
 typedef struct {
@@ -155,6 +156,7 @@ typedef struct {
 
 	struct wl_listener modifiers;
 	struct wl_listener key;
+	xkb_layout_index_t layout_idx;
 } KeyboardGroup;
 
 typedef struct {
@@ -273,6 +275,7 @@ static void fullscreennotify(struct wl_listener *listener, void *data);
 static void handlesig(int signo);
 static void incnmaster(const Arg *arg);
 static void inputdevice(struct wl_listener *listener, void *data);
+static void kblayoutnotify(KeyboardGroup *kb, int update);
 static int keybinding(uint32_t mods, xkb_keysym_t sym);
 static void keypress(struct wl_listener *listener, void *data);
 static void keypressmod(struct wl_listener *listener, void *data);
@@ -385,6 +388,8 @@ static struct wlr_box sgeom;
 static struct wl_list mons;
 static Monitor *selmon;
 
+xkb_layout_index_t status_layout_idx = -1;
+
 #ifdef XWAYLAND
 static void activatex11(struct wl_listener *listener, void *data);
 static void associatex11(struct wl_listener *listener, void *data);
@@ -772,6 +777,7 @@ createkeyboard(struct wlr_keyboard *keyboard)
 
 	/* Add the new keyboard to the group */
 	wlr_keyboard_group_add_keyboard(kb_group.wlr_group, keyboard);
+	kblayoutnotify(&kb_group, 1);
 }
 
 void
@@ -927,6 +933,7 @@ createnotify(struct wl_listener *listener, void *data)
 	struct wlr_xdg_surface *xdg_surface = data;
 	Client *c = NULL;
 	LayerSurface *l = NULL;
+	struct wlr_keyboard *kb = wlr_seat_get_keyboard(seat);
 
 	if (xdg_surface->role == WLR_XDG_SURFACE_ROLE_POPUP) {
 		struct wlr_xdg_popup *popup = xdg_surface->popup;
@@ -949,6 +956,9 @@ createnotify(struct wl_listener *listener, void *data)
 	c = xdg_surface->data = ecalloc(1, sizeof(*c));
 	c->surface.xdg = xdg_surface;
 	c->bw = borderpx;
+	c->layout_idx = kb
+		? xkb_state_serialize_layout(kb->xkb_state, XKB_STATE_LAYOUT_EFFECTIVE)
+		: 0;
 
 	wlr_xdg_toplevel_set_wm_capabilities(xdg_surface->toplevel,
 			WLR_XDG_TOPLEVEL_WM_CAPABILITIES_FULLSCREEN);
@@ -1165,6 +1175,9 @@ focusclient(Client *c, int lift)
 	int unused_lx, unused_ly, old_client_type;
 	Client *old_c = NULL;
 	LayerSurface *old_l = NULL;
+	xkb_mod_mask_t mdepr, mlatc, mlock;
+	xkb_layout_index_t ldepr, llatc, llock;
+	struct wlr_keyboard *kb = wlr_seat_get_keyboard(seat);
 
 	if (locked)
 		return;
@@ -1217,6 +1230,17 @@ focusclient(Client *c, int lift)
 	}
 	printstatus();
 
+	/* Update keyboard layout */
+	if (kb) {
+		mdepr = xkb_state_serialize_mods(kb->xkb_state, XKB_STATE_MODS_DEPRESSED);
+		mlatc = xkb_state_serialize_mods(kb->xkb_state, XKB_STATE_MODS_LATCHED);
+		mlock = xkb_state_serialize_mods(kb->xkb_state, XKB_STATE_MODS_LOCKED);
+		ldepr = xkb_state_serialize_layout(kb->xkb_state, XKB_STATE_LAYOUT_DEPRESSED);
+		llatc = xkb_state_serialize_layout(kb->xkb_state, XKB_STATE_LAYOUT_LATCHED);
+		llock = c ? c->layout_idx : 0;
+		xkb_state_update_mask(kb->xkb_state, mdepr, mlatc, mlock, ldepr, llatc, llock);
+	}
+
 	if (!c) {
 		/* With no client, all we have left is to clear focus */
 		wlr_seat_keyboard_notify_clear_focus(seat);
@@ -1227,7 +1251,7 @@ focusclient(Client *c, int lift)
 	motionnotify(0);
 
 	/* Have a client, so focus its top-level wlr_surface */
-	client_notify_enter(client_surface(c), wlr_seat_get_keyboard(seat));
+	client_notify_enter(client_surface(c), kb);
 
 	/* Activate the new client */
 	client_activate_surface(client_surface(c), 1);
@@ -1352,6 +1376,41 @@ inputdevice(struct wl_listener *listener, void *data)
 	wlr_seat_set_capabilities(seat, caps);
 }
 
+void
+kblayoutnotify(KeyboardGroup *kb, int update)
+{
+	FILE *f;
+	Client *c;
+	xkb_layout_index_t old = kb->layout_idx;
+
+	if (update) {
+		kb->layout_idx = xkb_state_serialize_layout(kb->wlr_group->keyboard.xkb_state,
+				XKB_STATE_LAYOUT_EFFECTIVE);
+
+		// Update client layout
+		if (kb->layout_idx != old && (c = focustop(selmon)))
+			c->layout_idx = kb->layout_idx;
+	}
+
+	// If layout did not change, do nothing
+	if (status_layout_idx == kb->layout_idx)
+		return;
+	status_layout_idx = kb->layout_idx;
+
+	// Save current layout to kblayout_file
+	if (*kblayout_file && (f = fopen(kblayout_file, "w"))) {
+		fputs(xkb_keymap_layout_get_name(kb->wlr_group->keyboard.keymap,
+				kb->layout_idx), f);
+		fclose(f);
+	}
+
+	// Run kblayout_cmd
+	if (kblayout_cmd[0] && fork() == 0) {
+		execvp(kblayout_cmd[0], (char *const *)kblayout_cmd);
+		die("dwl: execvp %s failed:", kblayout_cmd[0]);
+	}
+}
+
 int
 keybinding(uint32_t mods, xkb_keysym_t sym)
 {
@@ -1391,6 +1450,8 @@ keypress(struct wl_listener *listener, void *data)
 
 	wlr_idle_notifier_v1_notify_activity(idle_notifier, seat);
 
+	kblayoutnotify(group, 0);
+
 	/* On _press_ if there is no active screen locker,
 	 * attempt to process a compositor keybinding. */
 	if (!locked && event->state == WL_KEYBOARD_KEY_STATE_PRESSED) {
@@ -1429,6 +1490,8 @@ keypressmod(struct wl_listener *listener, void *data)
 	/* Send modifiers to the client. */
 	wlr_seat_keyboard_notify_modifiers(seat,
 			&group->wlr_group->keyboard.modifiers);
+
+	kblayoutnotify(group, 1);
 }
 
 int
-- 
2.43.0