book: Include ashpd only on linux so that listings run on macos

book/listings/Cargo.toml

@@ -7,7 +7,6 @@ edition = "2021"
 [dependencies]
 adw = { version = "0.7", package = "libadwaita", features = ["v1_5"] }
 anyhow = "1.0"
-ashpd = { version = "0.9", features = ["gtk4"] }
 async-channel = "2.0"
 dirs = "5.0"
 gtk = { version = "0.9", package = "gtk4", features = ["v4_12"] }
@@ -20,6 +19,9 @@ tokio = { version = "1.33.0", features = ["rt-multi-thread"] }
 walkdir = "2.3"
 xshell = "0.2"
 
+[target.'cfg(target_os = "linux")'.dependencies]
+ashpd = { version = "0.9", features = ["gtk4"] }
+
 [build-dependencies]
 glib-build-tools = "0.20"
 

book/listings/main_event_loop/7/main.rs

@@ -1,5 +1,3 @@
-use ashpd::desktop::account::UserInformation;
-use ashpd::WindowIdentifier;
 use glib::clone;
 use gtk::prelude::*;
 use gtk::{glib, Application, ApplicationWindow, Button};
@@ -34,23 +32,7 @@ fn build_ui(app: &Application) {
         glib::spawn_future_local(clone!(
             #[weak]
             button,
-            async move {
-                // Get native of button for window identifier
-                let native = button.native().expect("Need to be able to get native.");
-                // Get window identifier so that the dialog will be modal to the main window
-                let identifier = WindowIdentifier::from_native(&native).await;
-                let request = UserInformation::request()
-                    .reason("App would like to access user information.")
-                    .identifier(identifier)
-                    .send()
-                    .await;
-
-                if let Ok(response) = request.and_then(|r| r.response()) {
-                    println!("User name: {}", response.name());
-                } else {
-                    println!("Could not access user information.")
-                }
-            }
+            async move { fetch_user_information(button).await }
         ));
     });
     // ANCHOR_END: callback
@@ -65,3 +47,30 @@ fn build_ui(app: &Application) {
     // Present window
     window.present();
 }
+
+#[cfg(target_os = "linux")]
+async fn fetch_user_information(button: Button) {
+    use ashpd::desktop::account::UserInformation;
+    use ashpd::WindowIdentifier;
+
+    // Get native of button for window identifier
+    let native = button.native().expect("Need to be able to get native.");
+    // Get window identifier so that the dialog will be modal to the main window
+    let identifier = WindowIdentifier::from_native(&native).await;
+    let request = UserInformation::request()
+        .reason("App would like to access user information.")
+        .identifier(identifier)
+        .send()
+        .await;
+
+    if let Ok(response) = request.and_then(|r| r.response()) {
+        println!("User name: {}", response.name());
+    } else {
+        println!("Could not access user information.")
+    }
+}
+
+#[cfg(not(target_os = "linux"))]
+async fn fetch_user_information(_button: Button) {
+    println!("fetching user information not available outside target_os = \"linux\"");
+}