SettingsIO trait, save/load settings to/from file

uidev/src/testbed/testbed_dashboard.rs

@@ -1,7 +1,56 @@
 use crate::testbed::{Testbed, TestbedUpdateParams};
-use dash_frontend::frontend;
+use dash_frontend::{
+	frontend,
+	settings::{self, SettingsIO},
+};
 use wgui::layout::RcLayout;
 
+struct SimpleSettingsIO {
+	settings: settings::Settings,
+}
+
+impl SimpleSettingsIO {
+	fn new() -> Self {
+		let mut res = Self {
+			settings: settings::Settings::default(),
+		};
+		res.read_from_disk();
+		res
+	}
+}
+
+// just a simple impl of a config io for dashboard frontend
+// use ~/.config later
+impl settings::SettingsIO for SimpleSettingsIO {
+	fn get_mut(&mut self) -> &mut settings::Settings {
+		&mut self.settings
+	}
+
+	fn get(&self) -> &dash_frontend::settings::Settings {
+		&self.settings
+	}
+
+	fn save_to_disk(&mut self) {
+		log::info!("saving settings");
+		let data = self.settings.save();
+		std::fs::write("/tmp/testbed_settings.json", data).unwrap();
+	}
+
+	fn read_from_disk(&mut self) {
+		log::info!("loading settings");
+		if let Ok(res) = std::fs::read("/tmp/testbed_settings.json") {
+			let data = String::from_utf8(res).unwrap();
+			self.settings = settings::Settings::load(&data).unwrap();
+		}
+	}
+
+	fn mark_as_dirty(&mut self) {
+		// just save it, at least for now
+		// save_to_disk should be called later in time or at exit, not instantly
+		self.save_to_disk();
+	}
+}
+
 pub struct TestbedDashboard {
 	layout: RcLayout,
 	frontend: frontend::RcFrontend,
@@ -9,8 +58,10 @@ pub struct TestbedDashboard {
 
 impl TestbedDashboard {
 	pub fn new() -> anyhow::Result<Self> {
+		let settings = SimpleSettingsIO::new();
+
 		let (frontend, layout) = frontend::Frontend::new(frontend::InitParams {
-			settings: Default::default(),
+			settings: Box::new(settings),
 		})?;
 		Ok(Self { frontend, layout })
 	}