Implement TUI colon command mode

apps/tui/src/sidebar.rs

@@ -160,6 +160,47 @@ impl Sidebar {
         self.selected.as_ref()
     }
 
+    pub fn select_path(&mut self, path: &str, directory: bool) -> bool {
+        let target = collect_ids(&self.full)
+            .into_iter()
+            .find(|id| id.path() == path && id.is_directory() == directory);
+        let Some(target) = target else {
+            return false;
+        };
+        if !path.is_empty() {
+            let mut prefix = String::new();
+            for component in path
+                .split('/')
+                .take(path.split('/').count().saturating_sub(1))
+            {
+                if !prefix.is_empty() {
+                    prefix.push('/');
+                }
+                prefix.push_str(component);
+                self.expanded.insert(NodeId {
+                    path: prefix.clone(),
+                    directory: true,
+                });
+            }
+        }
+        self.selected = Some(target);
+        self.ensure_selected_visible();
+        true
+    }
+
+    pub fn completion_paths(&self) -> Vec<String> {
+        fn visit(nodes: &[SidebarNode], paths: &mut Vec<String>) {
+            for node in nodes {
+                paths.push(node.id.path.clone());
+                visit(&node.children, paths);
+            }
+        }
+
+        let mut paths = Vec::new();
+        visit(&self.full, &mut paths);
+        paths
+    }
+
     pub fn set_viewport_height(&mut self, height: usize) {
         self.viewport_height = height.max(1);
         self.ensure_selected_visible();
@@ -574,6 +615,31 @@ mod tests {
         );
     }
 
+    #[test]
+    fn command_selection_expands_ancestors_and_completion_uses_the_full_tree() {
+        let mut sidebar = sidebar();
+        assert!(sidebar.select_path("personal", true));
+        assert!(sidebar.select_path("personal/咖啡", false));
+        assert_eq!(sidebar.selected().map(NodeId::path), Some("personal/咖啡"));
+        assert!(
+            sidebar
+                .visible_rows()
+                .iter()
+                .any(|row| row.id.path() == "personal/咖啡")
+        );
+        assert_eq!(
+            sidebar.completion_paths(),
+            vec![
+                "personal",
+                "personal/email",
+                "personal/咖啡",
+                "work",
+                "work/server"
+            ]
+        );
+        assert!(!sidebar.select_path("personal/咖啡", true));
+    }
+
     #[test]
     fn empty_tree_has_no_stale_selection() {
         let mut sidebar = Sidebar::default();