Add Msg and MsgStore traits

cove-tui/src/main.rs

@@ -1,5 +1,6 @@
 #![warn(clippy::use_self)]
 
+mod traits;
 mod ui;
 
 use toss::terminal::Terminal;

cove-tui/src/traits.rs

@@ -0,0 +1,16 @@
+use async_trait::async_trait;
+use chrono::{DateTime, Utc};
+
+pub trait Msg {
+    type Id;
+    fn id(&self) -> Self::Id;
+
+    fn time(&self) -> DateTime<Utc>;
+    fn nick(&self) -> String;
+    fn content(&self) -> String;
+}
+
+#[async_trait]
+pub trait MsgStore<M: Msg> {
+    async fn path(room: &str, id: M::Id) -> Vec<M::Id>;
+}