Move cursor chronologically

src/ui/chat/tree.rs

@@ -139,6 +139,8 @@ impl<M: Msg, S: MsgStore<M>> InnerTreeViewState<M, S> {
         match event.code {
             KeyCode::Char('k') | KeyCode::Up if shift_only => self.move_cursor_up().await,
             KeyCode::Char('j') | KeyCode::Down if shift_only => self.move_cursor_down().await,
+            KeyCode::Char('h') | KeyCode::Left if shift_only => self.move_cursor_older().await,
+            KeyCode::Char('l') | KeyCode::Right if shift_only => self.move_cursor_newer().await,
             KeyCode::Char('g') | KeyCode::Home if shift_only => self.move_cursor_to_top().await,
             KeyCode::Char('G') | KeyCode::End if shift_only => self.move_cursor_to_bottom().await,
             KeyCode::Char('y') if event.modifiers == KeyModifiers::CONTROL => self.scroll_up(1),

src/ui/chat/tree/cursor.rs

@@ -211,6 +211,40 @@ impl<M: Msg, S: MsgStore<M>> InnerTreeViewState<M, S> {
         self.correction = Some(Correction::MakeCursorVisible);
     }
 
+    pub async fn move_cursor_older(&mut self) {
+        match &mut self.cursor {
+            Cursor::Msg(id) => {
+                if let Some(prev_id) = self.store.older_msg_id(id).await {
+                    *id = prev_id;
+                }
+            }
+            Cursor::Bottom | Cursor::Pseudo { .. } => {
+                if let Some(id) = self.store.newest_msg_id().await {
+                    self.cursor = Cursor::Msg(id);
+                }
+            }
+            _ => {}
+        }
+        self.correction = Some(Correction::MakeCursorVisible);
+    }
+
+    pub async fn move_cursor_newer(&mut self) {
+        match &mut self.cursor {
+            Cursor::Msg(id) => {
+                if let Some(prev_id) = self.store.newer_msg_id(id).await {
+                    *id = prev_id;
+                } else {
+                    self.cursor = Cursor::Bottom;
+                }
+            }
+            Cursor::Pseudo { .. } => {
+                self.cursor = Cursor::Bottom;
+            }
+            _ => {}
+        }
+        self.correction = Some(Correction::MakeCursorVisible);
+    }
+
     pub async fn move_cursor_to_top(&mut self) {
         if let Some(first_tree_id) = self.store.first_tree_id().await {
             self.cursor = Cursor::Msg(first_tree_id);