Introduce MaybeError type

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)?