Fix fallback when there are two config blocks for a keyboard

include/rootston/config.h

@@ -73,7 +73,7 @@ struct device_config *config_get_device(struct roots_config *config,
 
 /**
  * Get configuration for the keyboard. If the keyboard is not configured,
- * returns NULL.
+ * returns NULL. A NULL device returns the default config for keyboards.
  */
 struct keyboard_config *config_get_keyboard(struct roots_config *config,
 	struct wlr_input_device *device);

rootston/config.c

@@ -417,14 +417,12 @@ struct device_config *config_get_device(struct roots_config *config,
 struct keyboard_config *config_get_keyboard(struct roots_config *config,
 		struct wlr_input_device *device) {
 	struct keyboard_config *kc;
-	struct keyboard_config *default_kc = NULL;
 	wl_list_for_each(kc, &config->keyboards, link) {
-		if (strcmp(kc->name, "*") == 0) {
-			default_kc = kc;
-		} else if (strcmp(kc->name, device->name) == 0) {
+		if ((device != NULL && strcmp(kc->name, device->name) == 0) ||
+				(device == NULL && strcmp(kc->name, "*") == 0)) {
 			return kc;
 		}
 	}
 
-	return default_kc;
+	return NULL;
 }

rootston/cursor.c

@@ -217,10 +217,12 @@ static void handle_cursor_axis(struct wl_listener *listener, void *data) {
 
 static bool is_meta_pressed(struct roots_input *input,
 		struct wlr_input_device *device) {
-	struct keyboard_config *config = config_get_keyboard(input->server->config,
-		device);
 	uint32_t meta_key = 0;
-	if (config != NULL) {
+	struct keyboard_config *config;
+	if ((config = config_get_keyboard(input->server->config, device))) {
+		meta_key = config->meta_key;
+	} else if (!meta_key && (config = config_get_keyboard(input->server->config,
+			NULL))) {
 		meta_key = config->meta_key;
 	}
 	if (meta_key == 0) {

rootston/keyboard.c

@@ -125,6 +125,28 @@ static void keyboard_key_notify(struct wl_listener *listener, void *data) {
 	}
 }
 
+static void keyboard_config_merge(struct keyboard_config *config,
+		struct keyboard_config *fallback) {
+	if (fallback == NULL) {
+		return;
+	}
+	if (config->rules == NULL) {
+		config->rules = fallback->rules;
+	}
+	if (config->model == NULL) {
+		config->model = fallback->model;
+	}
+	if (config->layout == NULL) {
+		config->layout = fallback->layout;
+	}
+	if (config->variant == NULL) {
+		config->variant = fallback->variant;
+	}
+	if (config->options == NULL) {
+		config->options = fallback->options;
+	}
+}
+
 void keyboard_add(struct wlr_input_device *device, struct roots_input *input) {
 	struct roots_keyboard *keyboard = calloc(sizeof(struct roots_keyboard), 1);
 	if (keyboard == NULL) {
@@ -137,33 +159,27 @@ void keyboard_add(struct wlr_input_device *device, struct roots_input *input) {
 	wl_signal_add(&device->keyboard->events.key, &keyboard->key);
 	wl_list_insert(&input->keyboards, &keyboard->link);
 
-	struct keyboard_config *config = config_get_keyboard(input->config,
-		device);
+	struct keyboard_config config;
+	memset(&config, 0, sizeof(config));
+	keyboard_config_merge(&config, config_get_keyboard(input->config, device));
+	keyboard_config_merge(&config, config_get_keyboard(input->config, NULL));
+
+	struct keyboard_config env_config = {
+		.rules = getenv("XKB_DEFAULT_RULES"),
+		.model = getenv("XKB_DEFAULT_MODEL"),
+		.layout = getenv("XKB_DEFAULT_LAYOUT"),
+		.variant = getenv("XKB_DEFAULT_VARIANT"),
+		.options = getenv("XKB_DEFAULT_OPTIONS"),
+	};
+	keyboard_config_merge(&config, &env_config);
 
 	struct xkb_rule_names rules;
 	memset(&rules, 0, sizeof(rules));
-	if (config != NULL) {
-		rules.rules = config->rules;
-		rules.model = config->model;
-		rules.layout = config->layout;
-		rules.variant = config->variant;
-		rules.options = config->options;
-	}
-	if (rules.rules == NULL) {
-		rules.rules = getenv("XKB_DEFAULT_RULES");
-	}
-	if (rules.model == NULL) {
-		rules.model = getenv("XKB_DEFAULT_MODEL");
-	}
-	if (rules.layout == NULL) {
-		rules.layout = getenv("XKB_DEFAULT_LAYOUT");
-	}
-	if (rules.variant == NULL) {
-		rules.variant = getenv("XKB_DEFAULT_VARIANT");
-	}
-	if (rules.options == NULL) {
-		rules.options = getenv("XKB_DEFAULT_OPTIONS");
-	}
+	rules.rules = config.rules;
+	rules.model = config.model;
+	rules.layout = config.layout;
+	rules.variant = config.variant;
+	rules.options = config.options;
 	struct xkb_context *context = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
 	if (context == NULL) {
 		wlr_log(L_ERROR, "Cannot create XKB context");