Refactor command handling

src/traits.rs

@@ -1,9 +1,48 @@
 use std::sync::Arc;
 
+use cursive::view::{View, ViewWrapper};
+use cursive::views::IdView;
+use cursive::Cursive;
+
+use commands::CommandResult;
 use queue::Queue;
 
 pub trait ListItem {
     fn is_playing(&self, queue: Arc<Queue>) -> bool;
     fn display_left(&self) -> String;
     fn display_right(&self) -> String;
+    fn play(&self, queue: Arc<Queue>);
+    fn queue(&self, queue: Arc<Queue>);
+}
+
+pub trait ViewExt: View {
+    fn on_command(&mut self,
+        _s: &mut Cursive,
+        _cmd: &String,
+        _args: &[String]
+    ) -> Result<CommandResult, String> {
+        Ok(CommandResult::Ignored)
+    }
+}
+
+impl<V: ViewExt> ViewExt for IdView<V> {
+    fn on_command(&mut self,
+        s: &mut Cursive,
+        cmd: &String,
+        args: &[String]
+    ) -> Result<CommandResult, String> {
+        self.with_view_mut(move |v| {
+            v.on_command(s, cmd, args)
+        }).unwrap()
+    }
+}
+
+pub trait IntoBoxedViewExt {
+    fn as_boxed_view_ext(self) -> Box<dyn ViewExt>;
+}
+
+impl<V: ViewExt> IntoBoxedViewExt for V {
+    fn as_boxed_view_ext(self) -> Box<dyn ViewExt> {
+        Box::new(self)
+    }
 }