Factor out GUI code.

src/gui.rs

@@ -0,0 +1,27 @@
+use cxx_qt_lib::QString;
+use std::error::Error;
+
+pub mod colors;
+pub mod filesystem;
+
+pub fn run(root_path: std::path::PathBuf) -> Result<(), Box<dyn Error>> {
+    println!("Starting the GUI editor at {:?}", root_path);
+
+    use cxx_qt_lib::{QGuiApplication, QQmlApplicationEngine, QUrl};
+
+    let mut app = QGuiApplication::new();
+    let mut engine = QQmlApplicationEngine::new();
+
+    if let Some(engine) = engine.as_mut() {
+        engine.add_import_path(&QString::from("qml/"));
+    }
+    if let Some(engine) = engine.as_mut() {
+        engine.load(&QUrl::from("qml/main.qml"));
+    }
+
+    if let Some(app) = app.as_mut() {
+        app.exec();
+    }
+
+    Ok(())
+}