feat: add unread notification badge to dock icon

src-tauri/src/commands/window.rs

@@ -1,3 +1,5 @@
+#[cfg(target_os = "macos")]
+use cocoa::{appkit::NSApp, base::nil, foundation::NSString};
 use std::path::PathBuf;
 use tauri::utils::config::WindowEffectsConfig;
 use tauri::window::Effect;
@@ -166,3 +168,17 @@ pub fn open_window(
 
   Ok(())
 }
+
+#[tauri::command]
+pub fn set_badge(count: i32) {
+  #[cfg(target_os = "macos")]
+  unsafe {
+    let label = if count == 0 {
+      nil
+    } else {
+      NSString::alloc(nil).init_str(&format!("{}", count))
+    };
+    let dock_tile: cocoa::base::id = msg_send![NSApp(), dockTile];
+    let _: cocoa::base::id = msg_send![dock_tile, setBadgeLabel: label];
+  }
+}