Add command for current MPRIS track info

It reads the title, and if available, the artist(s).

kayleevc/plugins/mpris.py

@@ -44,7 +44,8 @@ class Plugin(PluginBase):
             'play music': MPRISPlayHandler,
             'play video': MPRISPlayHandler,
             'previous song': MPRISPreviousHandler,
-            'previous video': MPRISPreviousHandler
+            'previous video': MPRISPreviousHandler,
+            'whats playing': MPRISTrackInfoHandler
         }
 
         self.corpus_strings.update(self.commands)
@@ -122,3 +123,35 @@ class MPRISPreviousHandler(MPRISHandler):
             self.proxy.Previous()
         except GLib.Error:
             raise HandlerFailure()
+
+
+class MPRISTrackInfoHandler(MPRISHandler):
+    """Handler for getting info about the currently playing track from MPRIS"""
+
+    def __call__(self, tts):
+        """Get and speak info about the currently playing track"""
+        # Get metadata about the player
+        try:
+            metadata = self.proxy.Metadata
+        except GLib.Error:
+            raise HandlerFailure()
+
+        # Get the title
+        try:
+            title = metadata['xesam:title']
+        except KeyError:
+            raise HandlerFailure()
+
+        # Get the artist list (optional)
+        try:
+            artist_list = metadata['xesam:artist']
+        except KeyError:
+            artist_text = ''
+        else:
+            # Get the artists in a speakable format
+            artist_text = ' by ' + ', '.join(
+                    artist_list[:-2] + [', and '.join(artist_list[-2:])])
+
+
+        # Speak the information
+        tts(f"{title}{artist_text}")