From 9207aee6d877896485cb41b587896b8d6917bdb7 Mon Sep 17 00:00:00 2001
From: korei999 <ju7t1xe@gmail.com>
Date: Mon, 3 Jun 2024 20:39:52 +0300
Subject: [PATCH] add globalkey

---
 config.def.h |  7 ++++++
 dwl.c        | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 68 insertions(+), 2 deletions(-)

diff --git a/config.def.h b/config.def.h
index a784eb4..58da23e 100644
--- a/config.def.h
+++ b/config.def.h
@@ -119,6 +119,13 @@ static const enum libinput_config_tap_button_map button_map = LIBINPUT_CONFIG_TA
 static const char *termcmd[] = { "foot", NULL };
 static const char *menucmd[] = { "wmenu-run", NULL };
 
+#define ADDPASSRULE(S, M, K) {.appid = S, .len = LENGTH(S), .mod = M, .key = K}
+static const PassKeypressRule pass_rules[] = {
+	ADDPASSRULE("com.obsproject.Studio", MODKEY, XKB_KEY_Home),
+	ADDPASSRULE("havoc",                 0,      XKB_KEY_e),
+	/* each instance of havoc will receive input 'e' for example, regardless of which client is focused */
+};
+
 static const Key keys[] = {
 	/* Note that Shift changes certain key codes: c -> C, 2 -> at, etc. */
 	/* modifier                  key                 function        argument */
diff --git a/dwl.c b/dwl.c
index 356b913..021f78c 100644
--- a/dwl.c
+++ b/dwl.c
@@ -218,6 +218,13 @@ typedef struct {
 	int x, y;
 } MonitorRule;
 
+typedef struct {
+	const char* appid;
+	size_t len;
+	uint32_t mod;
+	uint32_t key;
+} PassKeypressRule;
+
 typedef struct {
 	struct wlr_pointer_constraint_v1 *constraint;
 	struct wl_listener destroy;
@@ -291,6 +298,7 @@ static void incnmaster(const Arg *arg);
 static void inputdevice(struct wl_listener *listener, void *data);
 static int keybinding(uint32_t mods, xkb_keysym_t sym);
 static void keypress(struct wl_listener *listener, void *data);
+static void keypresspass(struct wlr_surface *last_surface, struct wlr_keyboard_key_event *event, uint32_t mods, xkb_keysym_t keysym);
 static void keypressmod(struct wl_listener *listener, void *data);
 static int keyrepeat(void *data);
 static void killclient(const Arg *arg);
@@ -1502,6 +1510,8 @@ keypress(struct wl_listener *listener, void *data)
 	/* This event is raised when a key is pressed or released. */
 	KeyboardGroup *group = wl_container_of(listener, group, key);
 	struct wlr_keyboard_key_event *event = data;
+	struct wlr_surface *last_surface = seat->keyboard_state.focused_surface;
+	struct wlr_xdg_surface* xdg_surface = NULL;
 
 	/* Translate libinput keycode -> xkbcommon */
 	uint32_t keycode = event->keycode + 8;
@@ -1533,15 +1543,64 @@ keypress(struct wl_listener *listener, void *data)
 		wl_event_source_timer_update(group->key_repeat_source, 0);
 	}
 
-	if (handled)
+	if (handled) {
+		wlr_seat_set_keyboard(seat, &group->wlr_group->keyboard);
 		return;
+	}
+
+	if (last_surface) {
+		xdg_surface = wlr_xdg_surface_try_from_wlr_surface(last_surface);
+		/* don't pass when popup is focused */
+		/* this is better than having popups (like fuzzel or wmenu) closing while typing in a passed keybind */
+		if (xdg_surface && xdg_surface->role != WLR_XDG_SURFACE_ROLE_POPUP) {
+			keypresspass(last_surface, event, mods, syms[0]);
+		}
+	} else  {
+		/* if no surface pass anyway */
+		keypresspass(last_surface, event, mods, syms[0]);
+	}
 
-	wlr_seat_set_keyboard(seat, &group->wlr_group->keyboard);
 	/* Pass unhandled keycodes along to the client. */
 	wlr_seat_keyboard_notify_key(seat, event->time_msec,
 			event->keycode, event->state);
 }
 
+void
+keypresspass(struct wlr_surface *last_surface, struct wlr_keyboard_key_event *event, uint32_t mods, xkb_keysym_t keysym)
+{
+	Client *c = NULL, *savedc = focustop(selmon);
+	struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(seat);
+	uint32_t keycodes[32] = {0};
+	int reset = false;
+
+	wl_list_for_each(c, &clients, link) {
+		if (c && c != savedc) {
+			const char* appid = client_get_appid(c);
+			if (appid) {
+				for (size_t r = 0; r < LENGTH(pass_rules); r++) {
+					if (strncmp(appid, pass_rules[r].appid, pass_rules[r].len) == 0) {
+						uint32_t rcode = xkb_keysym_to_upper(pass_rules[r].key);
+						uint32_t pcode = xkb_keysym_to_upper(keysym);
+						/* match keysym only ignoring mods (case insensitive)
+						 * this fixes the case when we can release mod before the other key,
+						 * such that the client might not receive released state for than button
+						 * (or something like that) and stuck with the pressed state */
+						if (rcode == pcode) {
+							reset = true;
+							/* mods are passed to the surfaces anyway */
+							wlr_seat_keyboard_enter(seat, client_surface(c), keycodes, 0, &keyboard->modifiers);
+							wlr_seat_keyboard_notify_key(seat, event->time_msec, event->keycode, event->state);
+						}
+					}
+				}
+			}
+		}
+	}
+
+	if (reset)
+		wlr_seat_keyboard_enter(seat, last_surface, keycodes, 0, &keyboard->modifiers);
+}
+
 void
 keypressmod(struct wl_listener *listener, void *data)
 {
-- 
2.45.1