Print is off where it is not built; no blocked command runs from the palette (D-08)

crates/ely-platform/src/print.rs

@@ -2,6 +2,9 @@
 
 use std::path::Path;
 
+/// This build has a system print panel.
+pub const BUILT: bool = cfg!(target_os = "macos");
+
 /// Shows the print panel for `pdf`; false when cancelled.
 #[cfg(target_os = "macos")]
 pub fn print_pdf(pdf: &Path) -> anyhow::Result<bool> {
@@ -85,8 +88,8 @@ fn paper_for(sizes: &[(f64, f64)]) -> Option<(f64, f64)> {
 
 /// Printing needs a system panel this platform build lacks.
 #[cfg(not(target_os = "macos"))]
-pub fn print_pdf(pdf: &Path) -> anyhow::Result<bool> {
-    anyhow::bail!("printing {} is not built on this platform", pdf.display())
+pub fn print_pdf(_: &Path) -> anyhow::Result<bool> {
+    anyhow::bail!("printing is not built on this platform")
 }
 
 #[cfg(test)]

crates/ely-ui/src/commands.rs

@@ -131,6 +131,9 @@ fn label(command: &Command, cx: &App) -> SharedString {
 
 /// Why `id` cannot run; a document lifts the no-document block.
 pub fn blocked(id: &str, document: bool, cx: &App) -> Option<SharedString> {
+    if id == PRINT.id && !ely_platform::print::BUILT {
+        return Some(i18n::text(cx, "command.blocked.unbuilt", &[]));
+    }
     let command = RENAMING.iter().find(|command| command.id == id)?;
     let key = command.blocked.filter(|_| !document)?;
     Some(i18n::text(cx, key, &[]))
@@ -187,6 +190,10 @@ pub fn menus(
 }
 
 pub fn bind_keys(cx: &mut App) {
+    // Without a print panel, Print stays off the keyboard.
+    if ely_platform::print::BUILT {
+        cx.bind_keys([KeyBinding::new(PRINT.keys, Print, Some(CONTEXT))]);
+    }
     cx.bind_keys([
         KeyBinding::new(NEW.keys, New, Some(CONTEXT)),
         KeyBinding::new(OPEN.keys, Open, Some(CONTEXT)),
@@ -194,7 +201,6 @@ pub fn bind_keys(cx: &mut App) {
         KeyBinding::new(SAVE_AS.keys, SaveAs, Some(CONTEXT)),
         KeyBinding::new(RENAME.keys, Rename, Some(CONTEXT)),
         KeyBinding::new(EXPORT.keys, Export, Some(CONTEXT)),
-        KeyBinding::new(PRINT.keys, Print, Some(CONTEXT)),
         KeyBinding::new("secondary-w", CloseTab, Some(CONTEXT)),
         KeyBinding::new(TOGGLE_PALETTE, ToggleCommandPalette, Some(CONTEXT)),
         KeyBinding::new("secondary-q", Quit, None),

crates/ely-ui/src/i18n.rs

@@ -41,6 +41,7 @@ const EN: &[(&str, &str)] = &[
     ("command.file.export", "Export…"),
     ("command.file.print", "Print…"),
     ("command.blocked.no_document", "No open document"),
+    ("command.blocked.unbuilt", "Not built for this platform yet"),
     ("palette.group.file", "File"),
     ("gallery.ready", "Ready"),
     ("gallery.nav", "Navigation"),
@@ -96,6 +97,7 @@ const ZH_CN: &[(&str, &str)] = &[
     ("command.file.export", "导出…"),
     ("command.file.print", "打印…"),
     ("command.blocked.no_document", "没有打开的文档"),
+    ("command.blocked.unbuilt", "此平台尚未构建"),
     ("palette.group.file", "文件"),
     ("gallery.ready", "就绪"),
     ("gallery.nav", "导航"),

crates/ely-ui/src/shell/root.rs

@@ -157,16 +157,30 @@ impl Root {
     }
 
     fn attempt(&mut self, id: &'static str, cx: &mut Context<Self>) {
-        if let Some(reason) = commands::blocked(id, self.document, cx) {
-            log::info!("command: {id} blocked: {reason}");
-            self.last = Some(format!("{id} blocked").into());
-            self.toaster.update(cx, |toaster, cx| {
-                toaster.push(Toast::new(reason).severity(Severity::Warning), cx);
-            });
-            cx.notify();
-            return;
+        if !self.refused(id, cx) {
+            self.ran(id, cx);
         }
-        self.ran(id, cx);
+    }
+
+    /// Runs a palette pick; views act first, so check here.
+    pub fn run_from_palette(&mut self, id: &str, window: &mut Window, cx: &mut Context<Self>) {
+        if !self.refused(id, cx) {
+            commands::run(id, window, cx);
+        }
+    }
+
+    /// Whether `id` is blocked here; the reason shows.
+    fn refused(&mut self, id: &str, cx: &mut Context<Self>) -> bool {
+        let Some(reason) = commands::blocked(id, self.document, cx) else {
+            return false;
+        };
+        log::info!("command: {id} blocked: {reason}");
+        self.last = Some(format!("{id} blocked").into());
+        self.toaster.update(cx, |toaster, cx| {
+            toaster.push(Toast::new(reason).severity(Severity::Warning), cx);
+        });
+        cx.notify();
+        true
     }
 
     /// Shows `text` in the window's toaster.
@@ -305,6 +319,7 @@ impl Render for Root {
         if !self.palette {
             return frame.into_any_element();
         }
+        let run = cx.entity();
         let palette = CommandPalette::new("command-palette", move |_, cx| {
             this.update(cx, |this, cx| this.close_palette(cx));
         })
@@ -319,7 +334,7 @@ impl Render for Root {
             }),
         )
         .recent(self.recent.clone())
-        .on_run(move |value, window, cx| commands::run(value, window, cx));
+        .on_run(move |value, window, cx| run.update(cx, |root, cx| root.run_from_palette(value, window, cx)));
         frame.child(raise("palette", palette)).into_any_element()
     }
 }
@@ -332,3 +347,44 @@ fn view(path: &Path) -> std::io::Result<()> {
     }
     ely_platform::apps::open_default(path)
 }
+
+#[cfg(test)]
+mod tests {
+    use gpui::{FocusHandle, InteractiveElement as _, IntoElement, Render, TestAppContext, div};
+
+    /// A focused view that counts the saves it gets.
+    struct Saves(FocusHandle, usize);
+
+    impl Render for Saves {
+        fn render(&mut self, _: &mut gpui::Window, cx: &mut gpui::Context<Self>) -> impl IntoElement {
+            div().track_focus(&self.0).on_action(cx.listener(|saves, _: &crate::commands::Save, _, _| saves.1 += 1))
+        }
+    }
+
+    #[gpui::test]
+    fn a_blocked_palette_pick_never_reaches_the_view(cx: &mut TestAppContext) {
+        cx.update(|cx| {
+            ely_gpui_component::init_for_tests(cx);
+            crate::settings::install_defaults(cx);
+            crate::i18n::install(cx);
+        });
+        let window = cx.add_window(|_, cx| Saves(cx.focus_handle(), 0));
+        let (saves, root) = window
+            .update(cx, |view, window, cx| {
+                let saves = cx.entity();
+                let root = super::tool_root(ely_platform::AppId::Tree, saves.clone().into(), Vec::new(), window, cx);
+                // The root takes focus as it builds; give it back.
+                window.focus(&view.0, cx);
+                (saves, root)
+            })
+            .expect("the window lives");
+        cx.run_until_parked();
+        // Save without a document is blocked; so is Print unbuilt.
+        window
+            .update(cx, |_, window, cx| root.update(cx, |root, cx| root.run_from_palette("file.save", window, cx)))
+            .expect("the window lives");
+        cx.run_until_parked();
+        assert_eq!(cx.update(|cx| saves.read(cx).1), 0, "the view never gets it");
+        assert_eq!(cx.update(|cx| root.read(cx).toasts(cx).len()), 1, "the reason shows");
+    }
+}

tasks/BUGS.md

@@ -54,7 +54,7 @@
 - [x] D-05 邮件合并某条记录失败时内核文档泄漏 — 失败的记录照样关闭内核文档，再传出首个错误
 - [x] D-06 导航栏大纲点击按当前列表取下标，后台重读后可能越界 — 点击按绘制时的列表跳转；补点击路径的回归测试
 - [x] D-07 导航栏隐藏时仍随每次光标移动重读大纲与书签 — 隐藏时不跟随标签、不读；再显示时读一次
-- [ ] D-08 Linux、Windows 上“打印…”可用，导出 PDF 后才报“此平台未构建”
+- [x] D-08 Linux、Windows 上“打印…”可用，导出 PDF 后才报“此平台未构建” — 未构建平台禁用打印、不绑快捷键、错误不带路径；命令面板先查禁用
 - [x] M-01 键入期间外部以相同内容重写文件，丢掉上次停顿之后键入的全部文字 — 先等页面送出未送的键；同文只接过文件与字节、标签为已保存；磁盘回到上次保存的文字时保留编辑并恢复自动保存；R1–R4 字节、自动保存、在途写入、已保存基线；R5 PASS
 - [ ] M-02 `refresh` 归零版本计数却不换代，在途的一键让标签一直“未落定”
 - [ ] M-03 干净标签接过磁盘文字后关闭仍问“是否保存”