Add layout containers for new outputs

sway/handlers.c

@@ -5,6 +5,7 @@
 #include "handlers.h"
 
 bool handle_output_created(wlc_handle output) {
+	add_output(output);
 	return true;
 }
 

sway/layout.c

@@ -1,8 +1,46 @@
 #include <stdlib.h>
 #include <stdbool.h>
 #include <wlc/wlc.h>
+#include "list.h"
 #include "layout.h"
 
+list_t *outputs;
+
+void init_layout() {
+	outputs = create_list();
+}
+
+struct sway_container *get_container(wlc_handle output, int *index) {
+	int i;
+	for (i = 0; i < outputs->length; ++i) {
+		struct sway_container *c = outputs->items[i];
+		if (c->output == output) {
+			return c;
+		}
+	}
+	return NULL;
+}
+
+void add_output(wlc_handle output) {
+	struct sway_container *container = malloc(sizeof(struct sway_container));
+	// TODO: Get default layout from config
+	container->output = output;
+	container->children = create_list();
+	container->layout = LAYOUT_TILE_HORIZ;
+	list_add(outputs, container);
+}
+
+void destroy_output(wlc_handle output) {
+	int index;
+	struct sway_container *c = get_container(output, &index);
+	// TODO: Move all windows in this output somewhere else?
+	// I don't think this will ever be called unless we destroy the output ourselves
+	if (!c) {
+		return;
+	}
+	list_del(outputs, index);
+}
+
 wlc_handle get_topmost(wlc_handle output, size_t offset) {
    size_t memb;
    const wlc_handle *views = wlc_output_get_views(output, &memb);

sway/layout.h

@@ -4,11 +4,23 @@
 #include <wlc/wlc.h>
 #include "list.h"
 
+typedef enum {
+    LAYOUT_TILE_HORIZ,
+    LAYOUT_TILE_VERT,
+    LAYOUT_TABBED,
+    LAYOUT_STACKED
+} container_layout_t;
+
 struct sway_container {
-    wlc_handle output; // May be NULL
-    list_t children;
+    wlc_handle output;
+    list_t *children;
+    container_layout_t layout;
 };
 
+extern list_t *outputs;
+
+void init_layout();
+void add_output(wlc_handle output);
 wlc_handle get_topmost(wlc_handle output, size_t offset);
 
 #endif

sway/main.c

@@ -2,6 +2,7 @@
 #include <stdlib.h>
 #include <stdbool.h>
 #include <wlc/wlc.h>
+#include "layout.h"
 #include "config.h"
 #include "handlers.h"
 
@@ -27,6 +28,7 @@ void load_config() {
 
 int main(int argc, char **argv) {
 	load_config();
+	init_layout();
 
 	static struct wlc_interface interface = {
 		.output = {