Decouple core Yaak logic from Tauri (#354)

crates-tauri/yaak-mac-window/src/commands.rs

@@ -0,0 +1,36 @@
+use tauri::{Runtime, Window, command};
+
+#[command]
+pub(crate) fn set_title<R: Runtime>(window: Window<R>, title: &str) {
+    #[cfg(target_os = "macos")]
+    {
+        crate::mac::update_window_title(window, title.to_string());
+    }
+
+    #[cfg(not(target_os = "macos"))]
+    {
+        let _ = window.set_title(title);
+    }
+}
+
+#[command]
+#[allow(unused)]
+pub(crate) fn set_theme<R: Runtime>(window: Window<R>, bg_color: &str) {
+    #[cfg(target_os = "macos")]
+    {
+        use log::warn;
+        match csscolorparser::parse(bg_color.trim()) {
+            Ok(color) => {
+                crate::mac::update_window_theme(window, color);
+            }
+            Err(err) => {
+                warn!("Failed to parse background color '{}': {}", bg_color, err)
+            }
+        }
+    }
+
+    #[cfg(not(target_os = "macos"))]
+    {
+        // Nothing yet for non-Mac platforms
+    }
+}