swaybar: show hidden bar on key event

Since wayland does not currently allow swaybar to create global
keybinds, this is handled within sway and sent to the bar using a custom
event, so as not to pollute existing events, called bar_state_update.

3 files changed, 42 insertions, 6 deletions

diff --git a/sway/config/bar.c b/sway/config/bar.c
index 5726e95b..8b88642e 100644
--- a/sway/config/bar.c
+++ b/sway/config/bar.c
@@ -16,6 +16,7 @@
 #include "stringop.h"
 #include "list.h"
 #include "log.h"
+#include "util.h"
 
 static void terminate_swaybar(pid_t pid) {
 	wlr_log(WLR_DEBUG, "Terminating swaybar %d", pid);
@@ -101,6 +102,7 @@ struct bar_config *default_bar_config(void) {
 	bar->binding_mode_indicator = true;
 	bar->verbose = false;
 	bar->pid = 0;
+	bar->modifier = get_modifier_mask_by_name("Mod4");
 	if (!(bar->mode = strdup("dock"))) {
 	       goto cleanup;
 	}
diff --git a/sway/input/keyboard.c b/sway/input/keyboard.c
index fb1fe7b5..2c8b41cd 100644
--- a/sway/input/keyboard.c
+++ b/sway/input/keyboard.c
@@ -9,6 +9,7 @@
 #include "sway/input/input-manager.h"
 #include "sway/input/keyboard.h"
 #include "sway/input/seat.h"
+#include "sway/ipc-server.h"
 #include "log.h"
 
 /**
@@ -66,10 +67,10 @@ static void update_shortcut_state(struct sway_shortcut_state *state,
 	bool last_key_was_a_modifier = raw_modifiers != state->last_raw_modifiers;
 	state->last_raw_modifiers = raw_modifiers;
 
-    if (last_key_was_a_modifier && state->last_keycode) {
-        // Last pressed key before this one was a modifier
-        state_erase_key(state, state->last_keycode);
-    }
+	if (last_key_was_a_modifier && state->last_keycode) {
+		// Last pressed key before this one was a modifier
+		state_erase_key(state, state->last_keycode);
+	}
 
 	if (event->state == WLR_KEY_PRESSED) {
 		// Add current key to set; there may be duplicates
@@ -235,7 +236,6 @@ static void handle_keyboard_key(struct wl_listener *listener, void *data) {
 				code_modifiers);
 	}
 
-
 	bool handled = false;
 
 	// Identify active release binding
@@ -337,6 +337,19 @@ static int handle_keyboard_repeat(void *data) {
 	return 0;
 }
 
+static void determine_bar_visibility(uint32_t modifiers) {
+	for (int i = 0; i < config->bars->length; ++i) {
+		struct bar_config *bar = config->bars->items[i];
+		if (strcmp(bar->mode, bar->hidden_state) == 0) { // both are "hide"
+			bool should_be_visible = (~modifiers & bar->modifier) == 0;
+			if (bar->visible_by_modifier != should_be_visible) {
+				bar->visible_by_modifier = should_be_visible;
+				ipc_event_bar_state_update(bar);
+			}
+		}
+	}
+}
+
 static void handle_keyboard_modifiers(struct wl_listener *listener,
 		void *data) {
 	struct sway_keyboard *keyboard =
@@ -346,6 +359,9 @@ static void handle_keyboard_modifiers(struct wl_listener *listener,
 		keyboard->seat_device->input_device->wlr_device;
 	wlr_seat_set_keyboard(wlr_seat, wlr_device);
 	wlr_seat_keyboard_notify_modifiers(wlr_seat, &wlr_device->keyboard->modifiers);
+
+	uint32_t modifiers = wlr_keyboard_get_modifiers(wlr_device->keyboard);
+	determine_bar_visibility(modifiers);
 }
 
 struct sway_keyboard *sway_keyboard_create(struct sway_seat *seat,
@@ -464,7 +480,7 @@ void sway_keyboard_configure(struct sway_keyboard *keyboard) {
 	keyboard->keyboard_key.notify = handle_keyboard_key;
 
 	wl_list_remove(&keyboard->keyboard_modifiers.link);
-	wl_signal_add( &wlr_device->keyboard->events.modifiers,
+	wl_signal_add(&wlr_device->keyboard->events.modifiers,
 		&keyboard->keyboard_modifiers);
 	keyboard->keyboard_modifiers.notify = handle_keyboard_modifiers;
 }
diff --git a/sway/ipc-server.c b/sway/ipc-server.c
index 2d915502..63c95503 100644
--- a/sway/ipc-server.c
+++ b/sway/ipc-server.c
@@ -349,6 +349,22 @@ void ipc_event_barconfig_update(struct bar_config *bar) {
 	json_object_put(json);
 }
 
+void ipc_event_bar_state_update(struct bar_config *bar) {
+	if (!ipc_has_event_listeners(IPC_EVENT_BAR_STATE_UPDATE)) {
+		return;
+	}
+	wlr_log(WLR_DEBUG, "Sending bar_state_update event");
+
+	json_object *json = json_object_new_object();
+	json_object_object_add(json, "id", json_object_new_string(bar->id));
+	json_object_object_add(json, "visible_by_modifier",
+			json_object_new_boolean(bar->visible_by_modifier));
+
+	const char *json_string = json_object_to_json_string(json);
+	ipc_send_event(json_string, IPC_EVENT_BAR_STATE_UPDATE);
+	json_object_put(json);
+}
+
 void ipc_event_mode(const char *mode, bool pango) {
 	if (!ipc_has_event_listeners(IPC_EVENT_MODE)) {
 		return;
@@ -651,6 +667,8 @@ void ipc_client_handle_command(struct ipc_client *client) {
 				client->subscribed_events |= event_mask(IPC_EVENT_WORKSPACE);
 			} else if (strcmp(event_type, "barconfig_update") == 0) {
 				client->subscribed_events |= event_mask(IPC_EVENT_BARCONFIG_UPDATE);
+			} else if (strcmp(event_type, "bar_state_update") == 0) {
+				client->subscribed_events |= event_mask(IPC_EVENT_BAR_STATE_UPDATE);
 			} else if (strcmp(event_type, "mode") == 0) {
 				client->subscribed_events |= event_mask(IPC_EVENT_MODE);
 			} else if (strcmp(event_type, "shutdown") == 0) {