Remove AppError

src/main.rs

@@ -67,7 +67,7 @@ fn with<LIB: ILibrary, DB: IDatabase>(builder: MusicHoardBuilder<LIB, DB>) {
     let listener = EventListener::new(channel.sender());
     let handler = EventHandler::new(channel.receiver());
 
-    let app = App::new(music_hoard).expect("failed to initialise application");
+    let app = App::new(music_hoard);
     let ui = Ui;
 
     // Run the TUI application.

src/tui/app.rs

@@ -1,28 +1,7 @@
-use std::fmt;
-
 use musichoard::collection::{album::Album, artist::Artist, track::Track, Collection};
 use ratatui::widgets::ListState;
 
-use crate::tui::{lib::IMusicHoard, Error};
-
-#[derive(Debug)]
-pub enum AppError {
-    Lib(String),
-}
-
-impl fmt::Display for AppError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        match *self {
-            Self::Lib(ref s) => write!(f, "the musichoard library returned an error: {s}"),
-        }
-    }
-}
-
-impl From<musichoard::Error> for AppError {
-    fn from(err: musichoard::Error) -> AppError {
-        AppError::Lib(err.to_string())
-    }
-}
+use crate::tui::lib::IMusicHoard;
 
 pub enum AppState<BS, IS, RS, ES> {
     Browse(BS),
@@ -57,8 +36,9 @@ pub trait IAppInteract {
 
     fn is_running(&self) -> bool;
     fn quit(&mut self);
+    fn force_quit(&mut self);
 
-    fn save(&mut self) -> Result<(), AppError>;
+    fn save(&mut self);
 
     fn state(&mut self) -> AppState<&mut Self::BS, &mut Self::IS, &mut Self::RS, &mut Self::ES>;
 }
@@ -337,17 +317,24 @@ pub struct App<MH: IMusicHoard> {
 }
 
 impl<MH: IMusicHoard> App<MH> {
-    pub fn new(mut music_hoard: MH) -> Result<Self, Error> {
-        // FIXME: if either returns an error start in an error state
-        music_hoard.load_from_database()?;
-        music_hoard.rescan_library()?;
+    pub fn new(mut music_hoard: MH) -> Self {
+        let state = match Self::init(&mut music_hoard) {
+            Ok(()) => AppState::Browse(()),
+            Err(err) => AppState::Error(err.to_string()),
+        };
         let selection = Selection::new(Some(music_hoard.get_collection()));
-        Ok(App {
+        App {
             running: true,
             music_hoard,
             selection,
-            state: AppState::Browse(()),
-        })
+            state,
+        }
+    }
+
+    fn init(music_hoard: &mut MH) -> Result<(), musichoard::Error> {
+        music_hoard.load_from_database()?;
+        music_hoard.rescan_library()?;
+        Ok(())
     }
 }
 
@@ -362,11 +349,19 @@ impl<MH: IMusicHoard> IAppInteract for App<MH> {
     }
 
     fn quit(&mut self) {
+        if !self.state.is_error() {
+            self.running = false;
+        }
+    }
+
+    fn force_quit(&mut self) {
         self.running = false;
     }
 
-    fn save(&mut self) -> Result<(), AppError> {
-        Ok(self.music_hoard.save_to_database()?)
+    fn save(&mut self) {
+        if let Err(err) = self.music_hoard.save_to_database() {
+            self.state = AppState::Error(err.to_string());
+        }
     }
 
     fn state(&mut self) -> AppState<&mut Self::BS, &mut Self::IS, &mut Self::RS, &mut Self::ES> {
@@ -642,14 +637,50 @@ mod tests {
     }
 
     #[test]
-    fn running() {
-        let mut app = App::new(music_hoard(COLLECTION.to_owned())).unwrap();
+    fn running_quit() {
+        let mut app = App::new(music_hoard(COLLECTION.to_owned()));
         assert!(app.is_running());
 
         app.quit();
         assert!(!app.is_running());
     }
 
+    #[test]
+    fn error_quit() {
+        let mut app = App::new(music_hoard(COLLECTION.to_owned()));
+        assert!(app.is_running());
+
+        app.state = AppState::Error(String::from("get rekt"));
+
+        app.quit();
+        assert!(app.is_running());
+
+        app.dismiss_error();
+
+        app.quit();
+        assert!(!app.is_running());
+    }
+
+    #[test]
+    fn running_force_quit() {
+        let mut app = App::new(music_hoard(COLLECTION.to_owned()));
+        assert!(app.is_running());
+
+        app.force_quit();
+        assert!(!app.is_running());
+    }
+
+    #[test]
+    fn error_force_quit() {
+        let mut app = App::new(music_hoard(COLLECTION.to_owned()));
+        assert!(app.is_running());
+
+        app.state = AppState::Error(String::from("get rekt"));
+
+        app.force_quit();
+        assert!(!app.is_running());
+    }
+
     #[test]
     fn save() {
         let mut music_hoard = music_hoard(COLLECTION.to_owned());
@@ -659,15 +690,47 @@ mod tests {
             .times(1)
             .return_once(|| Ok(()));
 
-        let mut app = App::new(music_hoard).unwrap();
+        let mut app = App::new(music_hoard);
 
-        let result = app.save();
-        assert!(result.is_ok());
+        app.save();
+        assert!(app.state.is_browse());
+    }
+
+    #[test]
+    fn save_error() {
+        let mut music_hoard = music_hoard(COLLECTION.to_owned());
+
+        music_hoard
+            .expect_save_to_database()
+            .times(1)
+            .return_once(|| Err(musichoard::Error::DatabaseError(String::from("get rekt"))));
+
+        let mut app = App::new(music_hoard);
+
+        app.save();
+
+        assert!(app.state.is_error());
+    }
+
+    #[test]
+    fn init_error() {
+        let mut music_hoard = MockIMusicHoard::new();
+
+        music_hoard
+            .expect_load_from_database()
+            .times(1)
+            .return_once(|| Err(musichoard::Error::DatabaseError(String::from("get rekt"))));
+        music_hoard.expect_get_collection().return_const(vec![]);
+
+        let app = App::new(music_hoard);
+
+        assert!(app.is_running());
+        assert!(app.state.is_error());
     }
 
     #[test]
     fn modifiers() {
-        let mut app = App::new(music_hoard(COLLECTION.to_owned())).unwrap();
+        let mut app = App::new(music_hoard(COLLECTION.to_owned()));
         assert!(app.is_running());
 
         assert_eq!(app.selection.active, Category::Artist);
@@ -759,7 +822,7 @@ mod tests {
         let mut collection = COLLECTION.to_owned();
         collection[0].albums[0].tracks = vec![];
 
-        let mut app = App::new(music_hoard(collection)).unwrap();
+        let mut app = App::new(music_hoard(collection));
         assert!(app.is_running());
 
         assert_eq!(app.selection.active, Category::Artist);
@@ -788,7 +851,7 @@ mod tests {
         let mut collection = COLLECTION.to_owned();
         collection[0].albums = vec![];
 
-        let mut app = App::new(music_hoard(collection)).unwrap();
+        let mut app = App::new(music_hoard(collection));
         assert!(app.is_running());
 
         assert_eq!(app.selection.active, Category::Artist);
@@ -827,7 +890,7 @@ mod tests {
 
     #[test]
     fn no_artists() {
-        let mut app = App::new(music_hoard(vec![])).unwrap();
+        let mut app = App::new(music_hoard(vec![]));
         assert!(app.is_running());
 
         assert_eq!(app.selection.active, Category::Artist);
@@ -880,7 +943,7 @@ mod tests {
 
     #[test]
     fn info_overlay() {
-        let mut app = App::new(music_hoard(COLLECTION.to_owned())).unwrap();
+        let mut app = App::new(music_hoard(COLLECTION.to_owned()));
         assert!(app.state().is_browse());
 
         app.show_info_overlay();
@@ -892,7 +955,7 @@ mod tests {
 
     #[test]
     fn reload_go_back() {
-        let mut app = App::new(music_hoard(COLLECTION.to_owned())).unwrap();
+        let mut app = App::new(music_hoard(COLLECTION.to_owned()));
         assert!(app.state().is_browse());
 
         app.show_reload_menu();
@@ -911,7 +974,7 @@ mod tests {
             .times(1)
             .return_once(|| Ok(()));
 
-        let mut app = App::new(music_hoard).unwrap();
+        let mut app = App::new(music_hoard);
         assert!(app.state().is_browse());
 
         app.show_reload_menu();
@@ -930,7 +993,7 @@ mod tests {
             .times(1)
             .return_once(|| Ok(()));
 
-        let mut app = App::new(music_hoard).unwrap();
+        let mut app = App::new(music_hoard);
         assert!(app.state().is_browse());
 
         app.show_reload_menu();
@@ -949,7 +1012,7 @@ mod tests {
             .times(1)
             .return_once(|| Err(musichoard::Error::DatabaseError(String::from("get rekt"))));
 
-        let mut app = App::new(music_hoard).unwrap();
+        let mut app = App::new(music_hoard);
         assert!(app.state().is_browse());
 
         app.show_reload_menu();
@@ -961,13 +1024,4 @@ mod tests {
         app.dismiss_error();
         assert!(app.state().is_browse());
     }
-
-    #[test]
-    fn errors() {
-        let app_err: AppError = musichoard::Error::DatabaseError(String::from("get rekt")).into();
-
-        assert!(!app_err.to_string().is_empty());
-
-        assert!(!format!("{:?}", app_err).is_empty());
-    }
 }

src/tui/event.rs

@@ -2,14 +2,11 @@ use crossterm::event::{KeyEvent, MouseEvent};
 use std::fmt;
 use std::sync::mpsc;
 
-use crate::tui::app::AppError;
-
 #[derive(Debug)]
 pub enum EventError {
     Send(Event),
     Recv,
     Io(std::io::Error),
-    App(String),
 }
 
 impl fmt::Display for EventError {
@@ -20,12 +17,6 @@ impl fmt::Display for EventError {
             Self::Io(ref e) => {
                 write!(f, "an I/O error was triggered during event handling: {e}")
             }
-            Self::App(ref s) => {
-                write!(
-                    f,
-                    "the application returned an error during event handling: {s}"
-                )
-            }
         }
     }
 }
@@ -42,12 +33,6 @@ impl From<mpsc::RecvError> for EventError {
     }
 }
 
-impl From<AppError> for EventError {
-    fn from(err: AppError) -> EventError {
-        EventError::App(err.to_string())
-    }
-}
-
 #[derive(Clone, Copy, Debug)]
 pub enum Event {
     Key(KeyEvent),
@@ -148,16 +133,13 @@ mod tests {
         }));
         let recv_err = EventError::Recv;
         let io_err = EventError::Io(io::Error::new(io::ErrorKind::Interrupted, "interrupted"));
-        let app_err: EventError = AppError::Lib(String::from("lib error")).into();
 
         assert!(!send_err.to_string().is_empty());
         assert!(!recv_err.to_string().is_empty());
         assert!(!io_err.to_string().is_empty());
-        assert!(!app_err.to_string().is_empty());
 
         assert!(!format!("{:?}", send_err).is_empty());
         assert!(!format!("{:?}", recv_err).is_empty());
         assert!(!format!("{:?}", io_err).is_empty());
-        assert!(!format!("{:?}", app_err).is_empty());
     }
 }

src/tui/handler.rs

@@ -1,4 +1,3 @@
-// FIXME: Can code here be less verbose
 use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
 
 #[cfg(test)]
@@ -18,24 +17,11 @@ pub trait IEventHandler<APP: IAppInteract> {
 }
 
 trait IEventHandlerPrivate<APP: IAppInteract> {
-    fn handle_key_event(app: &mut APP, key_event: KeyEvent) -> Result<(), EventError>;
-    fn handle_browse_key_event(
-        app: &mut <APP as IAppInteract>::BS,
-        key_event: KeyEvent,
-    ) -> Result<(), EventError>;
-    fn handle_info_key_event(
-        app: &mut <APP as IAppInteract>::IS,
-        key_event: KeyEvent,
-    ) -> Result<(), EventError>;
-    fn handle_reload_key_event(
-        app: &mut <APP as IAppInteract>::RS,
-        key_event: KeyEvent,
-    ) -> Result<(), EventError>;
-    fn handle_error_key_event(
-        app: &mut <APP as IAppInteract>::ES,
-        key_event: KeyEvent,
-    ) -> Result<(), EventError>;
-    fn quit(app: &mut APP) -> Result<(), EventError>;
+    fn handle_key_event(app: &mut APP, key_event: KeyEvent);
+    fn handle_browse_key_event(app: &mut <APP as IAppInteract>::BS, key_event: KeyEvent);
+    fn handle_info_key_event(app: &mut <APP as IAppInteract>::IS, key_event: KeyEvent);
+    fn handle_reload_key_event(app: &mut <APP as IAppInteract>::RS, key_event: KeyEvent);
+    fn handle_error_key_event(app: &mut <APP as IAppInteract>::ES, key_event: KeyEvent);
 }
 
 pub struct EventHandler {
@@ -52,7 +38,7 @@ impl EventHandler {
 impl<APP: IAppInteract> IEventHandler<APP> for EventHandler {
     fn handle_next_event(&self, app: &mut APP) -> Result<(), EventError> {
         match self.events.recv()? {
-            Event::Key(key_event) => Self::handle_key_event(app, key_event)?,
+            Event::Key(key_event) => Self::handle_key_event(app, key_event),
             Event::Mouse(_) => {}
             Event::Resize(_, _) => {}
         };
@@ -61,44 +47,37 @@ impl<APP: IAppInteract> IEventHandler<APP> for EventHandler {
 }
 
 impl<APP: IAppInteract> IEventHandlerPrivate<APP> for EventHandler {
-    fn handle_key_event(app: &mut APP, key_event: KeyEvent) -> Result<(), EventError> {
+    fn handle_key_event(app: &mut APP, key_event: KeyEvent) {
         match key_event.code {
             // Exit application on `ESC` or `q`.
             KeyCode::Esc | KeyCode::Char('q') => {
-                Self::quit(app)?;
+                app.save();
+                app.quit();
             }
             // Exit application on `Ctrl-C`.
             KeyCode::Char('c') | KeyCode::Char('C') => {
                 if key_event.modifiers == KeyModifiers::CONTROL {
-                    Self::quit(app)?;
+                    app.force_quit();
                 }
             }
             _ => match app.state() {
                 AppState::Browse(browse) => {
-                    <Self as IEventHandlerPrivate<APP>>::handle_browse_key_event(
-                        browse, key_event,
-                    )?;
+                    <Self as IEventHandlerPrivate<APP>>::handle_browse_key_event(browse, key_event);
                 }
                 AppState::Info(info) => {
-                    <Self as IEventHandlerPrivate<APP>>::handle_info_key_event(info, key_event)?;
+                    <Self as IEventHandlerPrivate<APP>>::handle_info_key_event(info, key_event);
                 }
                 AppState::Reload(reload) => {
-                    <Self as IEventHandlerPrivate<APP>>::handle_reload_key_event(
-                        reload, key_event,
-                    )?;
+                    <Self as IEventHandlerPrivate<APP>>::handle_reload_key_event(reload, key_event);
                 }
                 AppState::Error(error) => {
-                    <Self as IEventHandlerPrivate<APP>>::handle_error_key_event(error, key_event)?;
+                    <Self as IEventHandlerPrivate<APP>>::handle_error_key_event(error, key_event);
                 }
             },
-        };
-        Ok(())
+        }
     }
 
-    fn handle_browse_key_event(
-        app: &mut <APP as IAppInteract>::BS,
-        key_event: KeyEvent,
-    ) -> Result<(), EventError> {
+    fn handle_browse_key_event(app: &mut <APP as IAppInteract>::BS, key_event: KeyEvent) {
         match key_event.code {
             // Category change.
             KeyCode::Left => app.decrement_category(),
@@ -113,28 +92,18 @@ impl<APP: IAppInteract> IEventHandlerPrivate<APP> for EventHandler {
             // Othey keys.
             _ => {}
         }
-
-        Ok(())
     }
 
-    fn handle_info_key_event(
-        app: &mut <APP as IAppInteract>::IS,
-        key_event: KeyEvent,
-    ) -> Result<(), EventError> {
+    fn handle_info_key_event(app: &mut <APP as IAppInteract>::IS, key_event: KeyEvent) {
         match key_event.code {
             // Toggle overlay.
             KeyCode::Char('m') | KeyCode::Char('M') => app.hide_info_overlay(),
             // Othey keys.
             _ => {}
         }
-
-        Ok(())
     }
 
-    fn handle_reload_key_event(
-        app: &mut <APP as IAppInteract>::RS,
-        key_event: KeyEvent,
-    ) -> Result<(), EventError> {
+    fn handle_reload_key_event(app: &mut <APP as IAppInteract>::RS, key_event: KeyEvent) {
         match key_event.code {
             // Reload keys.
             KeyCode::Char('l') | KeyCode::Char('L') => app.reload_library(),
@@ -144,23 +113,11 @@ impl<APP: IAppInteract> IEventHandlerPrivate<APP> for EventHandler {
             // Othey keys.
             _ => {}
         }
-
-        Ok(())
     }
 
-    fn handle_error_key_event(
-        app: &mut <APP as IAppInteract>::ES,
-        _key_event: KeyEvent,
-    ) -> Result<(), EventError> {
+    fn handle_error_key_event(app: &mut <APP as IAppInteract>::ES, _key_event: KeyEvent) {
         // Any key dismisses the error.
         app.dismiss_error();
-        Ok(())
-    }
-
-    fn quit(app: &mut APP) -> Result<(), EventError> {
-        app.quit();
-        app.save()?;
-        Ok(())
     }
 }
 // GRCOV_EXCL_STOP

src/tui/mod.rs

@@ -81,9 +81,6 @@ impl<B: Backend, UI: IUi, APP: IAppInteract + IAppAccess> Tui<B, UI, APP> {
         handler: impl IEventHandler<APP>,
     ) -> Result<(), Error> {
         while app.is_running() {
-            // FIXME: rendering logic should be in render.rs - reverse Renderer/Ui relationship so
-            // that TAPP calls are renderer.render(ui, frame); Then rename ui -> app and render -> ui
-            // as it used to be originally.
             self.terminal.draw(|frame| UI::render(&mut app, frame))?;
             handler.handle_next_event(&mut app)?;
         }
@@ -123,7 +120,7 @@ impl<B: Backend, UI: IUi, APP: IAppInteract + IAppAccess> Tui<B, UI, APP> {
                         Ok(err) => return Err(err.into()),
                         // Calling std::panic::resume_unwind(err) as recommended by the Rust docs
                         // will not produce an error message. The panic error message is printed at
-                        // the location of the panic which at the time is hidden by the TAPP.
+                        // the location of the panic which at the time is hidden by the TUI.
                         Err(_) => return Err(Error::ListenerPanic),
                     }
                 }
@@ -211,7 +208,7 @@ mod tests {
     }
 
     fn app(collection: Collection) -> App<MockIMusicHoard> {
-        App::new(music_hoard(collection)).unwrap()
+        App::new(music_hoard(collection))
     }
 
     fn listener() -> MockIEventListener {