sway: Add non-desktop-output type

Currently, when encountering a non-desktop display, sway offers the
output for leasing and returns without storing it in a sway specific
output type like `struct sway_output`.  Additionally, running
`swaymsg -t get_outputs` doesn't show non-desktop outputs.

This commit stores the non-desktop outputs into a struct called
`sway_output_non_desktop`, and adds them to a list on `sway_root`

include/sway/output.h

@@ -57,6 +57,12 @@ struct sway_output {
 	struct wl_event_source *repaint_timer;
 };
 
+struct sway_output_non_desktop {
+	struct wlr_output *wlr_output;
+
+	struct wl_listener destroy;
+};
+
 struct sway_output *output_create(struct wlr_output *wlr_output);
 
 void output_destroy(struct sway_output *output);
@@ -177,4 +183,6 @@ void handle_output_manager_test(struct wl_listener *listener, void *data);
 void handle_output_power_manager_set_mode(struct wl_listener *listener,
 	void *data);
 
+struct sway_output_non_desktop *output_non_desktop_create(struct wlr_output *wlr_output);
+
 #endif

include/sway/tree/root.h

@@ -28,6 +28,7 @@ struct sway_root {
 	double width, height;
 
 	list_t *outputs; // struct sway_output
+	list_t *non_desktop_outputs; // struct sway_output_non_desktop
 	list_t *scratchpad; // struct sway_container
 
 	// For when there's no connected outputs

sway/desktop/output.c

@@ -883,10 +883,12 @@ void handle_new_output(struct wl_listener *listener, void *data) {
 
 	if (wlr_output->non_desktop) {
 		sway_log(SWAY_DEBUG, "Not configuring non-desktop output");
+		struct sway_output_non_desktop *non_desktop = output_non_desktop_create(wlr_output);
 		if (server->drm_lease_manager) {
 			wlr_drm_lease_v1_manager_offer_output(server->drm_lease_manager,
 					wlr_output);
 		}
+		list_add(root->non_desktop_outputs, non_desktop);
 		return;
 	}
 

sway/tree/output.c

@@ -9,6 +9,7 @@
 #include "sway/output.h"
 #include "sway/tree/arrange.h"
 #include "sway/tree/workspace.h"
+#include "sway/server.h"
 #include "log.h"
 #include "util.h"
 
@@ -390,6 +391,33 @@ void output_get_box(struct sway_output *output, struct wlr_box *box) {
 	box->height = output->height;
 }
 
+static void handle_destroy_non_desktop(struct wl_listener *listener, void *data) {
+	struct sway_output_non_desktop *output =
+		wl_container_of(listener, output, destroy);
+
+	sway_log(SWAY_DEBUG, "Destroying non-desktop output '%s'", output->wlr_output->name);
+
+	int index = list_find(root->non_desktop_outputs, output);
+	list_del(root->non_desktop_outputs, index);
+
+	wl_list_remove(&output->destroy.link);
+
+	free(output);
+}
+
+struct sway_output_non_desktop *output_non_desktop_create(
+		struct wlr_output *wlr_output) {
+	struct sway_output_non_desktop *output =
+		calloc(1, sizeof(struct sway_output_non_desktop));
+
+	output->wlr_output = wlr_output;
+
+	wl_signal_add(&wlr_output->events.destroy, &output->destroy);
+	output->destroy.notify = handle_destroy_non_desktop;
+
+	return output;
+}
+
 enum sway_container_layout output_get_default_layout(
 		struct sway_output *output) {
 	if (config->default_orientation != L_NONE) {

sway/tree/root.c

@@ -38,6 +38,7 @@ struct sway_root *root_create(void) {
 	wl_list_init(&root->drag_icons);
 	wl_signal_init(&root->events.new_node);
 	root->outputs = create_list();
+	root->non_desktop_outputs = create_list();
 	root->scratchpad = create_list();
 
 	root->output_layout_change.notify = output_layout_handle_change;