G2: distinct XML copy name and a name prompt for web Save As (#2788)

apps/effectcraft-web/src/app.rs

@@ -213,8 +213,17 @@ fn install_hooks(app: &mut EffectcraftApp) {
         }
         None
     }));
-    // Saving downloads the file: the chosen name is all a "save dialog" needs.
-    app.hooks.pick_save = Some(Box::new(|name: &str| Some(files::path_for(if name.is_empty() { "Untitled Project.ecproj" } else { name }))));
+    // Saving downloads the file: the chosen name is all a "save dialog" needs. A project (Save As,
+    // Save a Copy) asks for the name, starting from the open project's (#2788): without asking,
+    // Save As would replace the open project's file; Cancel cancels.
+    app.hooks.pick_save = Some(Box::new(|name: &str| {
+        let name = if name.is_empty() { "Untitled Project.ecproj" } else { name };
+        if !std::path::Path::new(name).extension().is_some_and(|e| e.eq_ignore_ascii_case("ecproj") || e.eq_ignore_ascii_case("ecprojx")) {
+            return Some(files::path_for(name));
+        }
+        let typed = web_sys::window().and_then(|w| w.prompt_with_message_and_default("Save project as:", name).ok().flatten());
+        crate::store::typed_save_name(name, typed).map(|n| files::path_for(&n))
+    }));
     app.hooks.audio_device = Some(Box::new(audio::open));
     app.hooks.audio_devices = Some(Box::new(|| vec!["Browser default output".into()]));
 }

apps/effectcraft-web/src/store.rs

@@ -152,6 +152,19 @@ pub fn key_path(key: &str) -> Option<&str> {
     key.strip_prefix(FILES).filter(|p| p.starts_with('/'))
 }
 
+/// The project file name typed in the web's Save As prompt (#2788): `None` when it was cancelled or
+/// left empty; folders are dropped (the file table is flat) and a name without an extension gets
+/// the default's (`Intro copy` → `Intro copy.ecproj`).
+pub fn typed_save_name(default: &str, typed: Option<String>) -> Option<String> {
+    let typed = typed?;
+    let name = typed.trim().rsplit(['/', '\\']).next().unwrap_or("").trim();
+    if name.is_empty() {
+        return None;
+    }
+    let ext = Path::new(default).extension().map(|e| e.to_string_lossy().to_string()).unwrap_or_default();
+    if ext.is_empty() || Path::new(name).extension().is_some() { Some(name.to_string()) } else { Some(format!("{name}.{ext}")) }
+}
+
 /// FNV-1a 64. Computed when a disk-cache key first needs the file, not on every write.
 fn content_hash(data: &[u8]) -> u64 {
     let mut h: u64 = 0xcbf2_9ce4_8422_2325;
@@ -436,6 +449,17 @@ pub struct SnapshotMeta {
 mod tests {
     use super::*;
 
+    #[test]
+    fn typed_save_names() {
+        let t = |s: &str| Some(s.to_string());
+        assert_eq!(typed_save_name("Intro.ecproj", t("Intro copy")).as_deref(), Some("Intro copy.ecproj"));
+        assert_eq!(typed_save_name("Intro.ecproj", t("  Other.ecproj ")).as_deref(), Some("Other.ecproj"));
+        assert_eq!(typed_save_name("Intro.ecproj", t("a/b\\Shot.ecproj")).as_deref(), Some("Shot.ecproj"));
+        assert_eq!(typed_save_name("Intro.ecproj", t("   ")), None);
+        assert_eq!(typed_save_name("Intro.ecproj", t("folder/")), None);
+        assert_eq!(typed_save_name("Intro.ecproj", None), None);
+    }
+
     fn store() -> Arc<Store> {
         let s = Arc::new(Store::default());
         let _ = s.clock.set(|| 1_000.0);