properly implement "null" platform

Author: wgibbs-rs

Cargo.lock

@@ -1,8 +1,10 @@
 [package]
-name = "system-media"
-version = "0.1.0"
+name = "system_media"
+version = "0.1.5"
 edition = "2024"
 
+exclude = ["examples/*"]
+
 authors = ["William Gibbs <[email protected]>"]
 description = "Rust crate for interacting with the NowPlaying API"
 license = "MIT"

Cargo.toml

@@ -32,3 +32,6 @@ fn main() {
     println!("cargo:rustc-link-search=native={}", out_dir);
     println!("cargo:rustc-link-lib=static=swiftlib");
 }
+
+#[cfg(not(any(target_os = "macos")))]
+fn main() {}

build.rs

@@ -1 +1,57 @@
+use crate::{MediaBackend, MediaType};
+use std::error::Error;
 
+pub struct NullBackend;
+
+impl NullBackend {
+    pub fn new() -> Self {
+        Self
+    }
+}
+
+impl MediaBackend for NullBackend {
+    fn set_title(&self, title: &str) {
+        unimplemented!("system-media currently only supports macOS.");
+    }
+
+    fn set_artist(&self, artist: &str) {
+        unimplemented!("system-media currently only supports macOS.");
+    }
+
+    fn set_album(&self, album: &str) {
+        unimplemented!("system-media currently only supports macOS.");
+    }
+
+    fn set_genre(&self, genre: &str) {
+        unimplemented!("system-media currently only supports macOS.");
+    }
+
+    fn set_image(&self, path: &str) -> Result<(), Box<dyn Error>> {
+        unimplemented!("system-media currently only supports macOS.")
+    }
+
+    fn set_media_type(&self, media_type: MediaType) {
+        unimplemented!("system-media currently only supports macOS.");
+    }
+
+    fn set_playback_duration(&self, duration: f64) {
+        unimplemented!("system-media currently only supports macOS.");
+    }
+
+    fn set_elapsed_duration(&self, duration: f64) {
+        unimplemented!("system-media currently only supports macOS.");
+    }
+
+    fn set_playback_rate(&self, rate: f64) {
+        unimplemented!("system-media currently only supports macOS.");
+    }
+
+    fn start_session(&self) {
+        unimplemented!("system-media currently only supports macOS.");
+    }
+
+    fn stop_session(&self) {
+        unimplemented!("system-media currently only supports macOS.");
+        println!("how do we stop a session?");
+    }
+}