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, 11 insertions, 0 deletions

diff --git a/swaybar/CMakeLists.txt b/swaybar/CMakeLists.txt
index f59a48fd..373719de 100644
--- a/swaybar/CMakeLists.txt
+++ b/swaybar/CMakeLists.txt
@@ -5,7 +5,13 @@ include_directories(
         ${PANGO_INCLUDE_DIRS}
         ${JSONC_INCLUDE_DIRS}
         ${XKBCOMMON_INCLUDE_DIRS}
+        ${DBUS_INCLUDE_DIRS}
 )
+if (enable-tray)
+        file(GLOB tray
+                tray/*.c
+        )
+endif()
 
 add_executable(swaybar
         main.c
@@ -14,6 +20,8 @@ add_executable(swaybar
         bar.c
         status_line.c
         ipc.c
+        event_loop.c
+        ${tray}
 )
 
 target_link_libraries(swaybar
@@ -24,6 +32,7 @@ target_link_libraries(swaybar
         ${CAIRO_LIBRARIES}
         ${PANGO_LIBRARIES}
         ${JSONC_LIBRARIES}
+        ${DBUS_LIBRARIES}
 )
 
 if (WITH_GDK_PIXBUF)
@@ -32,6 +41,8 @@ if (WITH_GDK_PIXBUF)
         )
 endif()
 
+target_link_libraries(swaybar rt)
+
 install(
         TARGETS swaybar
         RUNTIME