add plugin infrastructure

src/plugins/messaging.rs

@@ -0,0 +1,45 @@
+use plugin::{Plugin, PluginReturn, PluginProxy};
+use event::Event;
+use minidom::Element;
+use jid::Jid;
+use ns;
+
+#[derive(Debug)]
+pub struct MessageEvent {
+    from: Jid,
+    to: Jid,
+    body: String,
+}
+
+impl Event for MessageEvent {}
+
+pub struct MessagingPlugin {
+    proxy: PluginProxy,
+}
+
+impl MessagingPlugin {
+    pub fn new() -> MessagingPlugin {
+        MessagingPlugin {
+            proxy: PluginProxy::new(),
+        }
+    }
+}
+
+impl Plugin for MessagingPlugin {
+    fn get_proxy(&mut self) -> &mut PluginProxy {
+        &mut self.proxy
+    }
+
+    fn handle(&mut self, elem: &Element) -> PluginReturn {
+        if elem.is("message", ns::CLIENT) && elem.attr("type") == Some("chat") {
+            if let Some(body) = elem.get_child("body", ns::CLIENT) {
+                self.proxy.dispatch(MessageEvent { // TODO: safety!!!
+                    from: elem.attr("from").unwrap().parse().unwrap(),
+                    to: elem.attr("to").unwrap().parse().unwrap(),
+                    body: body.text(),
+                });
+            }
+        }
+        PluginReturn::Continue
+    }
+}