1 files changed, 65 insertions, 5 deletions

diff --git a/src/mpris2-watcher.vala b/src/mpris2-watcher.vala
index 7814975..f572ab7 100644
--- a/src/mpris2-watcher.vala
+++ b/src/mpris2-watcher.vala
@@ -17,6 +17,8 @@ You should have received a copy of the GNU General Public License along
 with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+using Xml;
+
 [DBus (name = "org.freedesktop.DBus")]
 public interface FreeDesktopObject: Object {
   public abstract async string[] list_names() throws IOError;
@@ -25,6 +27,16 @@ public interface FreeDesktopObject: Object {
                                                    string new_owner );
 }
 
+[DBus (name = "org.freedesktop.DBus.Introspectable")]
+public interface FreeDesktopIntrospectable: Object {
+  public abstract string introspect() throws IOError;
+}
+
+public errordomain XmlError {
+    FILE_NOT_FOUND,
+    XML_DOCUMENT_EMPTY
+}
+
 public class Mpris2Watcher : GLib.Object
 {
   private const string FREEDESKTOP_SERVICE = "org.freedesktop.DBus";
@@ -33,14 +45,14 @@ public class Mpris2Watcher : GLib.Object
   private const string MPRIS_MEDIA_PLAYER_PATH = "/org/mpris/MediaPlayer2";
 
   FreeDesktopObject fdesktop_obj;
-  
+
   public signal void client_appeared ( string desktop_file_name, string dbus_name );
   public signal void client_disappeared ( string dbus_name );
 
   public Mpris2Watcher ()
   {
   }
-  
+
   construct
   {  
     try {
@@ -76,21 +88,69 @@ public class Mpris2Watcher : GLib.Object
     }
   }
 
-  private MprisRoot? create_mpris_root(string name){
+  private MprisRoot? create_mpris_root ( string name ){
     MprisRoot mpris2_root = null;
     if ( name.has_prefix (MPRIS_PREFIX) ){
       try {
         mpris2_root = Bus.get_proxy_sync (  BusType.SESSION,
-                                             name,
-                                             MPRIS_MEDIA_PLAYER_PATH );
+                                            name,
+                                            MPRIS_MEDIA_PLAYER_PATH );
       }
       catch (IOError e){
         warning( "Mpris2watcher could not create a root interface: %s",
                   e.message );
       }
     }
+    this.supports_playlists(name);
     return mpris2_root;
   }
+
+  private bool supports_playlists ( string name )
+  {
+    FreeDesktopIntrospectable introspectable;
+    try {
+      introspectable = Bus.get_proxy_sync (  BusType.SESSION,
+                                             name,
+                                             MPRIS_MEDIA_PLAYER_PATH );
+      var results = introspectable.introspect();
+      return this.parse_interfaces (results);      
+    }
+    catch (IOError e){
+      warning( "Could not create an introspectable object: %s",
+                e.message );
+    }
+    return false;
+  }
+
+  private bool parse_interfaces( string interface_info )
+  {
+    //parse the document from path
+    debug ("attempting to parse %s", interface_info);
+    Xml.Doc* xml_doc = Parser.parse_doc (interface_info);
+    if (xml_doc == null) {
+      warning ("Mpris2Watcher - parse-interfaces - failed to instantiate xml doc");
+      return false;
+    }
+    //get the root node. notice the dereferencing operator -> instead of .
+    Xml.Node* root_node = xml_doc->get_root_element ();
+    if (root_node == null) {
+      //free the document manually before throwing because the garbage collector can't work on pointers
+      delete xml_doc;
+      warning ("Mpris2Watcher - the interface info xml is empty");
+      return false;
+    }
+
+    //let's parse those nodes
+    for (Xml.Node* iter = root_node->children; iter != null; iter = iter->next) {
+      //spaces btw. tags are also nodes, discard them
+      if (iter->type != ElementType.ELEMENT_NODE)
+          continue; 
+      string node_name = iter->name; //get the node's name    
+      debug ( "this dbus object has interface %s ", node_name );
+    }
+    delete xml_doc;
+    return false;
+  }
   
   // At startup check to see if there are clients up that we are interested in
   // More relevant for development and daemon's like mpd.