ipc: implement GET_OUTPUTS

include/data.h

@@ -512,8 +512,8 @@ struct xoutput {
         /** Name of the output */
         char *name;
 
-        /** Whether the output is currently (has a CRTC attached with a valid
-         * mode) */
+        /** Whether the output is currently active (has a CRTC attached with a
+         * valid mode) */
         bool active;
 
         /** Internal flags, necessary for querying RandR screens (happens in

include/i3/ipc.h

@@ -32,6 +32,9 @@
 /** Subscribe to the specified events */
 #define I3_IPC_MESSAGE_TYPE_SUBSCRIBE           2
 
+/** Requests the current outputs from i3 */
+#define I3_IPC_MESSAGE_TYPE_GET_OUTPUTS         3
+
 /*
  * Messages from i3 to clients
  *
@@ -46,6 +49,9 @@
 /** Subscription reply type */
 #define I3_IPC_REPLY_TYPE_SUBSCRIBE             2
 
+/** Outputs reply type */
+#define I3_IPC_REPLY_TYPE_OUTPUTS               3
+
 /*
  * Events from i3 to clients. Events have the first bit set high.
  *