Wire up the additional channel interfaces a bit

src/padfoot/channel/messages.rs

@@ -32,26 +32,31 @@ impl telepathy::ChannelInterfaceMessages for Channel {
 
     fn supported_content_types(&self) -> Result<Vec<String>> {
         println!("Channel::supported_content_types()");
-        Err(MethodErr::no_arg())
+
+        Ok(vec!["text/plain".to_string()]) // TODO: image support
     }
 
     fn message_types(&self) -> Result<Vec<u32>> {
         println!("Channel::message_types()");
-        Err(MethodErr::no_arg())
+
+        Ok(vec![0]) // Normal messages. FIXME: MDNs too
     }
 
     fn message_part_support_flags(&self) -> Result<u32> {
         println!("Channel::message_part_support_flags()");
-        Err(MethodErr::no_arg())
+
+        Ok(0) // FIXME: support multipart messages
     }
 
     fn pending_messages(&self) -> Result<Vec<Vec<HashMap<String, VarArg>>>> {
         println!("Channel::pending_messages()");
-        Err(MethodErr::no_arg())
+
+        Ok(vec![]) // FIXME: check for pending messages
     }
 
     fn delivery_reporting_support(&self) -> Result<u32> {
         println!("Channel::delivery_reporting_support()");
-        Err(MethodErr::no_arg())
+
+        Ok(0) // FIXME: MDNs
     }
 }