0.1.20

build.rs

@@ -7,9 +7,35 @@ fn main() {
     let version = resolve_app_version();
     println!("cargo:rustc-env=APP_VERSION={version}");
 
+    embed_windows_icon();
+
     slint_build::compile("ui/app.slint").expect("Slint build failed");
 }
 
+/// Shell icon for `rcalc.exe` in Explorer (needs `assets/icon.ico` + windres/rc).
+fn embed_windows_icon() {
+    let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap_or_default();
+    if target_os != "windows" {
+        return;
+    }
+
+    println!("cargo:rerun-if-changed=assets/icon.ico");
+
+    let mut res = winresource::WindowsResource::new();
+    res.set_icon("assets/icon.ico");
+
+    // Cross-compile from Linux: mingw windres is prefixed.
+    if cfg!(not(windows)) {
+        let target = env::var("TARGET").unwrap_or_default();
+        if target.contains("windows-gnu") {
+            res.set_windres_path("x86_64-w64-mingw32-windres");
+        }
+    }
+
+    res.compile()
+        .expect("failed to embed Windows icon (is windres/rc available?)");
+}
+
 /// Window / package version shown as `Rcalc-{version}`.
 ///
 /// On each `release` build the patch in `Cargo.toml` is incremented once