feat: add alert dialog for opening failures

src/main.rs

@@ -7,7 +7,7 @@ use std::{borrow::Cow, path::PathBuf, time::Duration};
 
 use color_eyre::eyre::{OptionExt, Result, bail};
 use gobject::GtkZiplineFolder;
-use relm::{Dialog, DialogInput, Toast, ToastInput};
+use relm::{Dialog, DialogInput, StandaloneDialog, Toast, ToastInput};
 use relm4::{
     Component, ComponentController, Controller, RelmApp, Sender,
     adw::{self, prelude::*},
@@ -400,11 +400,10 @@ fn main() -> Result<()> {
 
     color_eyre::install()?;
 
-    // TODO: show dialog in case these error
-    let config = get_config()?;
-
-    let app = RelmApp::new("net.uku3lig.Tyrolienne");
-    app.run_async::<Tyrolienne>(config);
+    match get_config() {
+        Ok(config) => RelmApp::new("net.uku3lig.Tyrolienne").run_async::<Tyrolienne>(config),
+        Err(e) => RelmApp::new("net.uku3lig.Tyrolienne").run::<StandaloneDialog>(e.to_string()),
+    }
 
     Ok(())
 }

src/relm.rs

@@ -148,3 +148,53 @@ impl SimpleComponent for Toast {
         }
     }
 }
+
+pub struct StandaloneDialog;
+
+impl SimpleComponent for StandaloneDialog {
+    type Init = String;
+    type Input = ();
+    type Output = ();
+    type Root = adw::ApplicationWindow;
+    type Widgets = ();
+
+    fn init_root() -> Self::Root {
+        adw::ApplicationWindow::builder()
+            .title("Tyrolienne")
+            .default_width(400)
+            .default_height(300)
+            .build()
+    }
+
+    fn init(
+        init: Self::Init,
+        root: Self::Root,
+        _sender: relm4::ComponentSender<Self>,
+    ) -> relm4::ComponentParts<Self> {
+        let dialog = adw::AlertDialog::builder()
+            .heading("Could not open Tyrolienne")
+            .body(init)
+            .close_response("close")
+            .build();
+        dialog.add_response("close", "Close");
+
+        dialog.connect_closed(clone!(
+            #[strong]
+            root,
+            move |_| root.close()
+        ));
+
+        root.connect_show(clone!(
+            #[strong]
+            dialog,
+            #[strong]
+            root,
+            move |_| dialog.present(Some(&root))
+        ));
+
+        relm4::ComponentParts {
+            model: StandaloneDialog,
+            widgets: (),
+        }
+    }
+}