v0.1.0-pre.044

kb-app-demo-desktop/src/main.rs

@@ -0,0 +1,42 @@
+// file: kb-app-demo-desktop/src/main.rs
+// version: 1
+
+//! Binary entry point for the desktop demo application.
+
+#![forbid(unsafe_code)]
+#![deny(unreachable_pub)]
+#![warn(missing_docs)]
+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
+
+use fs2::FileExt; // rust-rules: trait-import
+
+/// Starts the single desktop demo application instance.
+#[tokio::main]
+async fn main() -> std::process::ExitCode {
+    let mut lock_path = std::env::temp_dir();
+    lock_path.push("com_sasedev_kb_app_demo_desktop.lock");
+    let lock_file = match std::fs::File::create(&lock_path) {
+        std::result::Result::Ok(file) => file,
+        std::result::Result::Err(error) => {
+            eprintln!("cannot create application lock '{}': {error}", lock_path.display());
+            return std::process::ExitCode::FAILURE;
+        },
+    };
+    if let std::result::Result::Err(error) = lock_file.try_lock_exclusive() {
+        if error.kind() == std::io::ErrorKind::WouldBlock {
+            eprintln!("another kb-app-demo-desktop instance is already running");
+            return std::process::ExitCode::FAILURE;
+        }
+        eprintln!("cannot acquire application lock '{}': {error}", lock_path.display());
+        return std::process::ExitCode::FAILURE;
+    }
+    let _lock_file = lock_file;
+    let run_result = kb_app_demo_desktop::run().await;
+    return match run_result {
+        std::result::Result::Ok(()) => std::process::ExitCode::SUCCESS,
+        std::result::Result::Err(error) => {
+            eprintln!("application error: {error}");
+            std::process::ExitCode::FAILURE
+        },
+    };
+}