LR-SIDEBAR-LOCAL-SYNC: Synchronize Folder in the Local folder menu

A Local folder that holds library photos (or has a folder with some inside)
now offers Synchronize Folder... like the Folders section. The check reads
the cached Folders tree only. Headless test covers shown and not shown.

crates/ui-egui/src/panels/left.rs

@@ -1024,6 +1024,9 @@ fn folder_tree(
         app.toast(ui.ctx(), e);
     }
     resp.context_menu(|ui| {
+        // the library actions of the Folders tree, when this folder (or one inside it) holds library photos
+        let library = app.caches.folder_tree(&app.session.catalog);
+        let held = library_node_for(&library, path);
         if (transient || indent > 0.0)
             && ui
                 .button(if transient { "Keep in Local" } else { "Add to Local" })
@@ -1067,6 +1070,9 @@ fn folder_tree(
         {
             let _ = f(path);
         }
+        if let Some(held) = &held {
+            synchronize_item(app, ui, &held.0, &held.1);
+        }
     });
     if open && indent < 12.0 * 8.0 {
         for (n, p) in subfolders(ui, path) {
@@ -1721,6 +1727,38 @@ fn row_menu(app: &mut LightcraftApp, resp: &egui::Response, n: &FolderNode) {
     }
 }
 
+/// The node Synchronize Folder… of a Local folder `path` works on, with the name its dialog shows:
+/// the Folders row for that very folder, else (a folder above rows) the folder itself, as a folder
+/// holding other folders. `None` when no library photo lies in `path` or inside it. Reads the
+/// cached Folders tree only; the disk is not touched.
+fn library_node_for(tree: &[FolderNode], path: &str) -> Option<(FolderNode, String)> {
+    use lightcraft_catalog::query::folder_within;
+    fn exact<'a>(tree: &'a [FolderNode], path: &str) -> Option<&'a FolderNode> {
+        tree.iter().find_map(|n| if same_folder(&n.path, path) { Some(n) } else { exact(&n.children, path) })
+    }
+    fn any_inside(tree: &[FolderNode], path: &str) -> bool {
+        tree.iter().any(|n| (n.count > 0 && folder_within(&n.path, path)) || any_inside(&n.children, path))
+    }
+    if let Some(n) = exact(tree, path).filter(|n| n.count > 0) {
+        return Some((n.clone(), lightcraft_catalog::folders::folder_label(&n.path)));
+    }
+    if !any_inside(tree, path) {
+        return None;
+    }
+    let name = std::path::Path::new(path).file_name().map(|f| f.to_string_lossy().to_string()).unwrap_or_else(|| path.to_string());
+    let node = FolderNode {
+        name: name.clone(),
+        path: path.to_string(),
+        count: 0,
+        own: 0,
+        volume: false,
+        selectable: false,
+        label: None,
+        children: Vec::new(),
+    };
+    Some((node, name))
+}
+
 /// Synchronize Folder… of a Folders row (widget `folderSynchronize`): opens its dialog, which
 /// scans the folder in the background.
 fn synchronize_item(app: &mut LightcraftApp, ui: &mut egui::Ui, n: &FolderNode, name: &str) {

crates/ui-egui/src/tests_sync.rs

@@ -5,6 +5,8 @@
 //! * Right-click a folder in the sidebar's Folders section ▸ Synchronize Folder…: a dialog opens
 //!   at once and scans the folder without holding up the app, then says how many photos are new,
 //!   missing, or have metadata updates.
+//! * Right-click a folder in the sidebar's Local section: Synchronize Folder… is there when the
+//!   folder holds library photos (or has a folder with some inside), and not when it holds none.
 //! * Synchronize with the defaults imports the new photos and leaves missing ones alone.
 //! * Ticking "Remove missing photos" also moves those to Recently Deleted.
 //! * Cancel leaves the library as it was.
@@ -302,3 +304,42 @@ fn the_folders_scan_shows_a_row_and_its_cross_closes_the_dialog() {
     h.settle(SETTLE);
     assert!(h.app.ui.dialog.is_none(), "a stopped scan opens nothing later");
 }
+
+/// Right-click the Local row of `folder`; whether Synchronize Folder… is in its menu.
+fn local_menu_offers_synchronize(h: &mut Headless, folder: &str) -> bool {
+    let row = format!("source:local:{folder}");
+    assert!(h.step_until(T, |h| h.app.widgets.iter().any(|(w, _)| *w == row)), "no row {row}");
+    let rect = h.app.widgets.iter().find(|(w, _)| *w == row).map(|(_, r)| *r).unwrap();
+    let c = rect.center();
+    let r = h.request("ui.click", json!({"x": c.x, "y": c.y, "button": "right"}), T);
+    assert_eq!(r["ok"], true, "{r}");
+    h.step();
+    h.step();
+    h.app.widgets.iter().any(|(w, _)| *w == "folderSynchronize")
+}
+
+#[test]
+fn a_local_folder_with_library_photos_offers_synchronize() {
+    let dir = Scratch::new("local-menu");
+    let mut h = changed_folder(&dir);
+    std::fs::create_dir_all(dir.path("empty")).unwrap();
+    // Local writes paths the way the OS does
+    let native = |f: &str| dir.0.join(f).to_string_lossy().to_string();
+    for f in ["trip", "empty"] {
+        let r = h.request("engine.execute", json!({"command": "local.addRoot", "params": {"path": native(f)}}), T);
+        assert_eq!(r["ok"], true, "{r}");
+    }
+    h.step();
+    assert!(!local_menu_offers_synchronize(&mut h, &native("empty")), "no library photos in it: nothing to synchronize");
+    // close that menu, then open the other folder's
+    let r = h.request("ui.key", json!({"key": "Escape"}), T);
+    assert_eq!(r["ok"], true, "{r}");
+    h.step();
+    h.step();
+    assert!(local_menu_offers_synchronize(&mut h, &native("trip")), "the folder holds library photos");
+    let r = h.request("ui.clickWidget", json!({"id": "folderSynchronize"}), T);
+    assert_eq!(r["ok"], true, "{r}");
+    h.step();
+    assert!(matches!(h.app.ui.dialog, Some(Dialog::SynchronizeFolder { .. })), "the dialog opens at once");
+    assert!(h.step_until(T, |h| matches!(&h.app.ui.dialog, Some(Dialog::SynchronizeFolder { counts: Some(_), .. }))));
+}