Implement Tray Icons

This commit implements the StatusNotifierItem protocol, and enables
swaybar to show tray icons. It also uses `xembedsniproxy` in order to
communicate with xembed applications.
The tray is completely optional, and can be disabled on compile time
with the `enable-tray` option. Or on runtime with the bar config option
`tray_output none`.

Overview of changes:
In swaybar very little is changed outside the tray subfolder except
that all events are now polled in `event_loop.c`, this creates no
functional difference.

Six bar configuration options were added, these are detailed in
sway-bar(5)

The tray subfolder is where all protocol implementation takes place and
is organised as follows:

tray/sni_watcher.c:
	This file contains the StatusNotifierWatcher. It keeps track of
	items and hosts and reports when they come or go.
tray/tray.c
	This file contains the StatusNotifierHost. It keeps track of
	sway's version of the items and represents the tray itself.
tray/sni.c
	This file contains the StatusNotifierItem struct and all
	communication with individual items.
tray/icon.c
	This file implements the icon theme protocol. It allows for
	finding icons by name, rather than by pixmap.
tray/dbus.c
	This file allows for asynchronous DBus communication.

See #986 #343

1 files changed, 16 insertions, 1 deletions

diff --git a/sway/ipc-json.c b/sway/ipc-json.c
index 512144a4..31de53f0 100644
--- a/sway/ipc-json.c
+++ b/sway/ipc-json.c
@@ -327,7 +327,22 @@ json_object *ipc_json_describe_bar_config(struct bar_config *bar) {
 
 	json_object *json = json_object_new_object();
 	json_object_object_add(json, "id", json_object_new_string(bar->id));
-	json_object_object_add(json, "tray_output", NULL);
+#ifdef ENABLE_TRAY
+	if (bar->tray_output) {
+		json_object_object_add(json, "tray_output", json_object_new_string(bar->tray_output));
+	} else {
+		json_object_object_add(json, "tray_output", NULL);
+	}
+	if (bar->icon_theme) {
+		json_object_object_add(json, "icon_theme", json_object_new_string(bar->icon_theme));
+	} else {
+		json_object_object_add(json, "icon_theme", NULL);
+	}
+	json_object_object_add(json, "tray_padding", json_object_new_int(bar->tray_padding));
+	json_object_object_add(json, "activate_button", json_object_new_int(bar->activate_button));
+	json_object_object_add(json, "context_button", json_object_new_int(bar->context_button));
+	json_object_object_add(json, "secondary_button", json_object_new_int(bar->secondary_button));
+#endif
 	json_object_object_add(json, "mode", json_object_new_string(bar->mode));
 	json_object_object_add(json, "hidden_state", json_object_new_string(bar->hidden_state));
 	json_object_object_add(json, "modifier", json_object_new_string(get_modifier_name_by_mask(bar->modifier)));