Introduce MaybeError type

src/pages/import.rs

@@ -4,7 +4,7 @@ use crate::pages::import::ImportMessage::*;
 use crate::data::entities::{WordData, WordGroup};
 use crate::navigation::{NavigatedPage, Page, RootMessage};
 use crate::notification::NotificationData::OpenFileError;
-use crate::notification::NotificationData;
+use crate::notification::{MaybeError, NotificationData};
 use crate::styling::*;
 use iced::widget::button::danger;
 use iced::widget::container::success;
@@ -373,7 +373,7 @@ impl ImportState {
         )
     }
 
-    fn extract_import_file(path: PathBuf) -> Result<(), NotificationData> {
+    fn extract_import_file(path: PathBuf) -> MaybeError {
         let file = File::open(path).map_err(|_| OpenFileError)?;
         let reader = BufReader::new(file);
         let mut archive = ZipArchive::new(reader).map_err(|_| OpenFileError)?;

src/pages/repetition.rs

@@ -6,7 +6,7 @@ use crate::data::entities::{CardStatistics, DeckSettings, WordData};
 use crate::data_provider::voice::get_voice;
 use crate::navigation::Page::PreviousPage;
 use crate::navigation::{KeyPressedPage, NavigatedPage, Page, RootMessage};
-use crate::notification::NotificationData;
+use crate::notification::{MaybeError, NotificationData};
 use crate::styling::*;
 use crate::{push_error, push_error_task};
 use chrono::Local;
@@ -337,7 +337,7 @@ pub enum RepetitionMessage {
 async fn play_sound(
     sink: Arc<Option<MixerDeviceSink>>,
     text: String,
-) -> Result<(), NotificationData> {
+) -> MaybeError {
     let data = get_voice(text.as_str()).await?;
     spawn_blocking(move || {
         if let Some(sink) = sink.as_ref()
@@ -347,6 +347,6 @@ async fn play_sound(
         }
     })
     .await
-    .unwrap();
+    .expect("Playing sound failed");
     Ok(())
 }

src/pages/repetition_settings.rs

@@ -4,7 +4,7 @@ use crate::data_provider::card_sets::{delete_set, update_deck};
 use crate::data_provider::card_stats::{delete_stats, load_stats_of_deck};
 use crate::navigation::Page::PreviousPage;
 use crate::navigation::{NavigatedPage, Page, RootMessage};
-use crate::notification::NotificationData;
+use crate::notification::MaybeError;
 use crate::pages::repetition_settings::RepetitionSettingsMessage::*;
 use crate::styling::*;
 use crate::{push_error, push_error_task};
@@ -13,7 +13,7 @@ use iced::widget::text_input::Catalog;
 use iced::widget::{button, column, row, scrollable, space, text, text_input};
 use iced::{Element, Task};
 use iced_core::Length::Fill;
-use iced_core::{Padding, Theme, color};
+use iced_core::{color, Padding, Theme};
 use parking_lot::Mutex;
 use std::sync::Arc;
 use std::time::Duration;
@@ -179,7 +179,7 @@ impl NavigatedPage<RepetitionSettingsMessage> for RepetitionSettingsState {
     }
 }
 
-fn update_deck_stats(deck: &DeckSettings, state: &AppState) -> Result<(), NotificationData> {
+fn update_deck_stats(deck: &DeckSettings, state: &AppState) -> MaybeError {
     let mut db_stats = load_stats_of_deck(deck, &state.connection).expect("Wrong db operation");
     let filtered_words = deck.get_word_list(state);
     filtered_words.iter().for_each(|word| {

src/pages/repetitions.rs

@@ -1,12 +1,12 @@
 use crate::app::AppState;
 use crate::core::srs::{AppendMode, OrderMode};
-use crate::data::Id;
 use crate::data::entities::{CardStatistics, DeckSettings};
+use crate::data::Id;
 use crate::data_provider::card_sets::update_deck;
 use crate::data_provider::card_stats::{add_stat_list, load_stats_of_deck};
 use crate::navigation::Page::{History, PreviousPage, Repetition, RepetitionSettings};
 use crate::navigation::{NavigatedPage, Page, RootMessage};
-use crate::notification::{NotificationData, NotificationRequest};
+use crate::notification::{MaybeError, NotificationRequest};
 use crate::pages::history::HistoryState;
 use crate::pages::repetition::RepetitionState;
 use crate::pages::repetition_settings::RepetitionSettingsState;
@@ -16,17 +16,17 @@ use crate::push_error_task;
 use crate::styling::*;
 use chrono::{Days, Local, Utc};
 use hashbrown::{HashMap, HashSet};
+use iced::widget::button::{danger, Status};
 pub use iced::widget::button::{Catalog, Style};
-use iced::widget::button::{Status, danger};
 use iced::widget::tooltip::Position::Top;
 use iced::widget::{
-    Column, Row, button, column, container, lazy, radio, row, scrollable, space, svg, text,
-    text_input, tooltip,
+    button, column, container, lazy, radio, row, scrollable, space, svg, text, text_input, tooltip,
+    Column, Row,
 };
 use iced::{Background, Border, Center, Color, Element, Fill, Length, Shadow, Task, Theme};
-use iced_core::Padding;
 use iced_core::border::Radius;
 use iced_core::svg::Handle;
+use iced_core::Padding;
 use parking_lot::Mutex;
 use std::ops::Deref;
 use std::sync::Arc;
@@ -562,7 +562,7 @@ impl RepetitionsState {
 }
 
 impl RepetitionsState {
-    fn append_all_words(state: &mut AppState, deck: &DeckViewData) -> Result<(), NotificationData> {
+    fn append_all_words(state: &mut AppState, deck: &DeckViewData) -> MaybeError {
         let existing = &deck.existing_words_indices;
         let mut created_set = HashSet::with_capacity(existing.len());
         existing.iter().for_each(|c| {
@@ -580,7 +580,7 @@ impl RepetitionsState {
         state: &mut AppState,
         deck: &DeckSettings,
         indices: impl Iterator<Item = usize>,
-    ) -> Result<(), NotificationData> {
+    ) -> MaybeError {
         let words = &state.dictionary;
         let stats = &mut indices
             .map(|i| {
@@ -618,7 +618,7 @@ impl RepetitionsState {
         self.selected_deck_index = None;
     }
 
-    fn fill_deck_word_indices(&mut self) -> Result<(), NotificationData> {
+    fn fill_deck_word_indices(&mut self) -> MaybeError {
         let state = &self.state.lock();
         let mut deck = self.selected_deck().unwrap().clone();
         let added: Vec<_> = load_stats_of_deck(&deck, &state.connection)?