обновление

src/app.rs

@@ -1,9 +1,9 @@
-use std::time::Duration;
+use std::time::{Duration, Instant};
 
 use crate::audio::AudioPlayer;
 use crate::library::{Library, SortMode};
 use crate::state::{RepeatMode, SavedState};
-use crate::track::scan_dir;
+use crate::track::{scan_dir, Track};
 
 #[derive(Clone, Copy, PartialEq)]
 pub enum Panel {
@@ -25,23 +25,33 @@ pub struct App {
     pub active_panel: Panel,
     pub input_mode: InputMode,
     pub search_buffer: String,
-    /// Исходный (неотфильтрованный) список треков — для пересборки библиотеки
-    raw_tracks: Vec<crate::track::Track>,
-    /// Директория с музыкой — чтобы сохранить в state
+    raw_tracks: Vec<Track>,
     music_dir: String,
     pub repeat: RepeatMode,
     pub shuffle: bool,
+    pub show_help: bool,
+    status_set_at: Instant,
 }
 
+const STATUS_RESET_AFTER: Duration = Duration::from_secs(2);
+
 impl App {
     pub fn new(music_dir: &str) -> Result<Self, Box<dyn std::error::Error>> {
-        let tracks = scan_dir(music_dir);
+        let tracks = match crate::state::load_cache(music_dir) {
+            Some(cached) => cached,
+            None => {
+                let scanned = scan_dir(music_dir);
+                crate::state::save_cache(music_dir, &scanned);
+                scanned
+            }
+        };
+
         let library = Library::build(tracks.clone(), SortMode::ByArtist);
 
         let mut app = Self {
             library,
             player: AudioPlayer::new()?,
-            status: "? — help".into(),
+            status: "F1 — помощь".into(),
             playing_index: None,
             active_panel: Panel::Left,
             input_mode: InputMode::Normal,
@@ -50,9 +60,10 @@ impl App {
             music_dir: music_dir.to_string(),
             repeat: RepeatMode::Off,
             shuffle: false,
+            show_help: false,
+            status_set_at: Instant::now(),
         };
 
-        // Восстанавливаем сохранённое состояние
         let saved = crate::state::load();
         if let Some(vol) = saved.volume {
             app.player.set_volume(vol);
@@ -63,20 +74,138 @@ impl App {
         if let Some(sh) = saved.shuffle {
             app.shuffle = sh;
         }
-        if saved.sort_by_filename == Some(true) {
-            app.library = Library::build(app.raw_tracks.clone(), SortMode::ByFilename);
+        if let Some(mode) = saved.sort_mode {
+            if mode != SortMode::ByArtist {
+                app.library = Library::build(app.raw_tracks.clone(), mode);
+            }
         }
 
+        app.restore_playing(&saved);
         Ok(app)
     }
 
+    fn set_status(&mut self, text: String) {
+        self.status = text;
+        self.status_set_at = Instant::now();
+    }
+
+    fn default_status(&self) -> String {
+        match self.playing_index.and_then(|i| self.library.track(i)) {
+            Some(t) => format!("▶ {} — {}", t.artist, t.title),
+            None => "F1 — помощь".into(),
+        }
+    }
+
+    pub fn tick_status(&mut self) {
+        if self.input_mode == InputMode::Search {
+            return;
+        }
+        if self.status_set_at.elapsed() < STATUS_RESET_AFTER {
+            return;
+        }
+        let default = self.default_status();
+        if self.status != default {
+            self.status = default;
+        }
+    }
+
+    fn restore_playing(&mut self, saved: &SavedState) {
+        let Some(path_str) = &saved.last_playing_path else {
+            return;
+        };
+
+        let target_path = std::path::PathBuf::from(path_str);
+        let Some(idx) = self
+            .library
+            .all_tracks
+            .iter()
+            .position(|t| t.path == target_path)
+        else {
+            return;
+        };
+
+        let start_pos = saved.last_playing_pos_secs.map(Duration::from_secs);
+
+        if let Some(track) = self.library.track(idx).cloned() {
+            if self.player.play(&track.path, start_pos).is_ok() {
+                self.playing_index = Some(idx);
+                self.library.sync_with_playing(idx);
+                self.player.toggle_pause();
+                self.set_status(format!("Восстановлен: {} — {}", track.artist, track.title));
+            }
+        }
+    }
+
+    pub fn toggle_help(&mut self) {
+        self.show_help = !self.show_help;
+    }
+
+    pub fn next_track(&mut self) {
+        let total = self.library.all_tracks.len();
+        if total == 0 {
+            self.set_status("Библиотека пуста".into());
+            return;
+        }
+
+        let next = match self.playing_index {
+            Some(i) if i + 1 < total => i + 1,
+            Some(_) => {
+                if self.repeat == RepeatMode::Off {
+                    self.set_status("Конец плейлиста".into());
+                    return;
+                }
+                0
+            }
+            None => 0,
+        };
+
+        self.play_index(next);
+        self.library.sync_with_playing(next);
+    }
+
+    pub fn prev_track(&mut self) {
+        let total = self.library.all_tracks.len();
+        if total == 0 {
+            self.set_status("Библиотека пуста".into());
+            return;
+        }
+
+        let prev = match self.playing_index {
+            Some(0) => {
+                if self.repeat == RepeatMode::Off {
+                    self.set_status("Это первый трек".into());
+                    return;
+                }
+                total - 1
+            }
+            Some(i) => i - 1,
+            None => 0,
+        };
+
+        self.play_index(prev);
+        self.library.sync_with_playing(prev);
+    }
+
     fn persist(&self) {
+        let playing_path = self
+            .playing_index
+            .and_then(|i| self.library.track(i))
+            .map(|t| t.path.to_string_lossy().to_string());
+
+        let playing_pos = if self.playing_index.is_some() {
+            Some(self.player.position().as_secs())
+        } else {
+            None
+        };
+
         let state = SavedState {
             last_path: Some(self.music_dir.clone()),
             volume: Some(self.player.volume()),
-            sort_by_filename: Some(self.library.sort_mode == SortMode::ByFilename),
+            sort_mode: Some(self.library.sort_mode),
             repeat: Some(self.repeat),
             shuffle: Some(self.shuffle),
+            last_playing_path: playing_path,
+            last_playing_pos_secs: playing_pos,
         };
         crate::state::save(&state);
     }
@@ -85,40 +214,39 @@ impl App {
         self.persist();
     }
 
-    // ── Поиск ──────────────────────────────────────────────────
-
     pub fn start_search(&mut self) {
         self.input_mode = InputMode::Search;
         self.search_buffer.clear();
-        self.status = "Поиск: ".into();
+        self.status_set_at = Instant::now();
     }
 
     pub fn cancel_search(&mut self) {
         self.input_mode = InputMode::Normal;
         self.search_buffer.clear();
         self.rebuild_library();
-        self.status = "Поиск отменён".into();
+        self.set_status("Поиск отменён".into());
     }
 
     pub fn commit_search(&mut self) {
         self.input_mode = InputMode::Normal;
-        self.status = if self.search_buffer.is_empty() {
-            "Фильтр сброшен".into()
+        let msg = if self.search_buffer.is_empty() {
+            "Фильтр сброшен".to_string()
         } else {
             format!("Фильтр: {}", self.search_buffer)
         };
+        self.set_status(msg);
     }
 
     pub fn search_push(&mut self, c: char) {
         self.search_buffer.push(c);
         self.rebuild_library();
-        self.status = format!("Поиск: {}", self.search_buffer);
+        self.status_set_at = Instant::now();
     }
 
     pub fn search_pop(&mut self) {
         self.search_buffer.pop();
         self.rebuild_library();
-        self.status = format!("Поиск: {}", self.search_buffer);
+        self.status_set_at = Instant::now();
     }
 
     fn rebuild_library(&mut self) {
@@ -133,8 +261,6 @@ impl App {
         }
     }
 
-    // ── Навигация ──────────────────────────────────────────────
-
     pub fn up(&mut self) {
         match self.active_panel {
             Panel::Left => self.library.artist_move(-1),
@@ -154,27 +280,29 @@ impl App {
             Panel::Left => Panel::Right,
             Panel::Right => Panel::Left,
         };
-        self.status = match self.active_panel {
-            Panel::Left => "Активна: исполнители".into(),
-            Panel::Right => "Активна: альбомы/треки".into(),
+        let msg = match self.active_panel {
+            Panel::Left => "Активна: левая панель".to_string(),
+            Panel::Right => "Активна: правая панель".to_string(),
         };
+        self.set_status(msg);
     }
 
-    /// f — прыжок к играющему треку
     pub fn jump_to_playing(&mut self) {
         if let Some(i) = self.playing_index {
             self.library.sync_with_playing(i);
             self.active_panel = Panel::Right;
-            self.status = "→ к играющему треку".into();
+            self.set_status("→ к играющему треку".into());
         } else {
-            self.status = "Ничего не играет".into();
+            self.set_status("Ничего не играет".into());
         }
     }
 
-    /// g — в начало, G — в конец
     pub fn goto_start(&mut self) {
         match self.active_panel {
-            Panel::Left => self.library.artist_selected = 0,
+            Panel::Left => {
+                self.library.artist_selected = 0;
+                self.library.left_state.select(Some(0));
+            }
             Panel::Right => self.library.right_goto_start(),
         }
     }
@@ -184,24 +312,25 @@ impl App {
             Panel::Left => {
                 if !self.library.artists.is_empty() {
                     self.library.artist_selected = self.library.artists.len() - 1;
+                    self.library
+                        .left_state
+                        .select(Some(self.library.artist_selected));
                 }
             }
             Panel::Right => self.library.right_goto_end(),
         }
     }
 
-    // ── Playback ───────────────────────────────────────────────
-
     pub fn play_index(&mut self, index_in_library: usize) {
         let Some(track) = self.library.track(index_in_library).cloned() else {
             return;
         };
-        match self.player.play(&track.path) {
+        match self.player.play(&track.path, None) {
             Ok(_) => {
-                self.status = format!("▶ {} — {}", track.artist, track.title);
                 self.playing_index = Some(index_in_library);
+                self.set_status(format!("▶ {} — {}", track.artist, track.title));
             }
-            Err(e) => self.status = format!("Ошибка: {}", e),
+            Err(e) => self.set_status(format!("Ошибка: {}", e)),
         }
     }
 
@@ -209,27 +338,25 @@ impl App {
         if let Some(idx) = self.library.right_track_index() {
             self.play_index(idx);
         } else {
-            self.status = "Выделен заголовок альбома".into();
+            self.set_status("Выделен заголовок группы".into());
         }
     }
 
     pub fn stop(&mut self) {
         self.player.stop();
         self.playing_index = None;
-        self.status = "Остановлено".into();
+        self.set_status("Остановлено".into());
     }
 
     pub fn toggle_pause(&mut self) {
         self.player.toggle_pause();
     }
 
-    /// Автопереход с учётом repeat и shuffle
     pub fn maybe_advance(&mut self) {
         if self.playing_index.is_none() || !self.player.is_finished() {
             return;
         }
 
-        // Repeat One — играем тот же трек
         if self.repeat == RepeatMode::One {
             if let Some(i) = self.playing_index {
                 self.play_index(i);
@@ -243,7 +370,6 @@ impl App {
         }
 
         let next = if self.shuffle {
-            // Псевдослучайный выбор без rand-крейта
             let seed = std::time::SystemTime::now()
                 .duration_since(std::time::UNIX_EPOCH)
                 .map(|d| d.as_nanos() as usize)
@@ -256,8 +382,7 @@ impl App {
                     if self.repeat == RepeatMode::All {
                         0
                     } else {
-                        // Off — останавливаемся
-                        self.status = "Конец плейлиста".into();
+                        self.set_status("Конец плейлиста".into());
                         self.playing_index = None;
                         return;
                     }
@@ -275,37 +400,39 @@ impl App {
             RepeatMode::All => RepeatMode::One,
             RepeatMode::One => RepeatMode::Off,
         };
-        self.status = match self.repeat {
-            RepeatMode::Off => "Repeat: off".into(),
-            RepeatMode::All => "Repeat: all".into(),
-            RepeatMode::One => "Repeat: one".into(),
+        let msg = match self.repeat {
+            RepeatMode::Off => "Repeat: off".to_string(),
+            RepeatMode::All => "Repeat: all".to_string(),
+            RepeatMode::One => "Repeat: one".to_string(),
         };
+        self.set_status(msg);
     }
 
     pub fn toggle_shuffle(&mut self) {
         self.shuffle = !self.shuffle;
-        self.status = if self.shuffle {
-            "Shuffle: on".into()
+        let msg = if self.shuffle {
+            "Shuffle: on".to_string()
         } else {
-            "Shuffle: off".into()
+            "Shuffle: off".to_string()
         };
+        self.set_status(msg);
     }
 
-    // ── Громкость, перемотка ───────────────────────────────────
-
     pub fn volume_up(&mut self) {
         self.player.change_volume(0.05);
-        self.status = format!("Громкость: {}%", (self.player.volume() * 100.0) as u32);
+        let msg = format!("Громкость: {}%", (self.player.volume() * 100.0) as u32);
+        self.set_status(msg);
     }
 
     pub fn volume_down(&mut self) {
         self.player.change_volume(-0.05);
-        self.status = format!("Громкость: {}%", (self.player.volume() * 100.0) as u32);
+        let msg = format!("Громкость: {}%", (self.player.volume() * 100.0) as u32);
+        self.set_status(msg);
     }
 
     pub fn seek(&mut self, delta_secs: i64) {
         if self.playing_index.is_none() {
-            self.status = "Ничего не воспроизводится".into();
+            self.set_status("Ничего не воспроизводится".into());
             return;
         }
         let total = self
@@ -317,22 +444,22 @@ impl App {
         match self.player.seek_by(delta_secs, total) {
             Ok(new_pos) => {
                 let sign = if delta_secs >= 0 { "+" } else { "" };
-                self.status = format!(
+                let msg = format!(
                     "Перемотка {}{}с → {:02}:{:02}",
                     sign,
                     delta_secs,
                     new_pos.as_secs() / 60,
                     new_pos.as_secs() % 60,
                 );
+                self.set_status(msg);
             }
-            Err(_) => self.status = "Перемотка недоступна".into(),
+            Err(_) => self.set_status("Перемотка недоступна".into()),
         }
     }
 
-    /// Перемотка по цифрам 1–9 (10%..90%)
     pub fn seek_percent(&mut self, percent: u8) {
         if self.playing_index.is_none() {
-            self.status = "Ничего не воспроизводится".into();
+            self.set_status("Ничего не воспроизводится".into());
             return;
         }
         let total = match self
@@ -342,21 +469,22 @@ impl App {
         {
             Some(d) if !d.is_zero() => d,
             _ => {
-                self.status = "Длительность неизвестна".into();
+                self.set_status("Длительность неизвестна".into());
                 return;
             }
         };
         let target = total.mul_f32(percent as f32 / 100.0);
         match self.player.seek_to(target) {
             Ok(_) => {
-                self.status = format!(
+                let msg = format!(
                     "→ {}% ({:02}:{:02})",
                     percent,
                     target.as_secs() / 60,
                     target.as_secs() % 60,
                 );
+                self.set_status(msg);
             }
-            Err(_) => self.status = "Перемотка недоступна".into(),
+            Err(_) => self.set_status("Перемотка недоступна".into()),
         }
     }
 
@@ -369,7 +497,8 @@ impl App {
 
     pub fn toggle_sort(&mut self) {
         let new_mode = match self.library.sort_mode {
-            SortMode::ByArtist => SortMode::ByFilename,
+            SortMode::ByArtist => SortMode::ByAlbum,
+            SortMode::ByAlbum => SortMode::ByFilename,
             SortMode::ByFilename => SortMode::ByArtist,
         };
 
@@ -391,9 +520,11 @@ impl App {
             self.library.sync_with_playing(i);
         }
 
-        self.status = match new_mode {
-            SortMode::ByArtist => "Сортировка: по артисту/альбому".into(),
-            SortMode::ByFilename => "Сортировка: по имени файла".into(),
+        let msg = match new_mode {
+            SortMode::ByArtist => "Сортировка: по артисту/альбому".to_string(),
+            SortMode::ByAlbum => "Сортировка: по альбому/артисту".to_string(),
+            SortMode::ByFilename => "Сортировка: по имени файла".to_string(),
         };
+        self.set_status(msg);
     }
 }

src/audio.rs

@@ -124,7 +124,6 @@ where
     fn total_duration(&self) -> Option<Duration> {
         self.inner.total_duration()
     }
-    // ВАЖНО: пробрасываем try_seek, иначе Sink::try_seek вернёт NotSupported
     fn try_seek(&mut self, pos: Duration) -> Result<(), rodio::source::SeekError> {
         self.inner.try_seek(pos)
     }
@@ -150,17 +149,31 @@ impl AudioPlayer {
         })
     }
 
-    pub fn play(&mut self, path: &PathBuf) -> Result<(), Box<dyn std::error::Error>> {
+    /// Запускает трек, опционально перематывая в `start_pos` ДО начала воспроизведения.
+    /// Перемотка делается на декодере — это предотвращает щелчок на старте.
+    pub fn play(
+        &mut self,
+        path: &PathBuf,
+        start_pos: Option<Duration>,
+    ) -> Result<(), Box<dyn std::error::Error>> {
         self.sink.stop();
         self.paused_pos = None;
+
         let file = File::open(path)?;
-        // Decoder::try_from автоматически настраивает seekable и byte_len[citation:1][citation:19]
-        let decoder = Decoder::try_from(file)?;
+        let mut decoder = Decoder::try_from(file)?;
+
+        if let Some(pos) = start_pos {
+            if !pos.is_zero() {
+                let _ = decoder.try_seek(pos);
+            }
+        }
+
         let tapped = TapSource {
             inner: decoder,
             bus: self.spectrum.clone(),
         };
         self.sink.append(tapped);
+        // ВАЖНО: явно снимаем паузу — sink.stop() не сбрасывает состояние pause.
         self.sink.play();
         Ok(())
     }

src/library.rs

@@ -1,16 +1,20 @@
 use ratatui::widgets::ListState;
+use serde::{Deserialize, Serialize};
 
 use crate::track::Track;
 
 #[derive(Clone)]
 pub enum RightRow {
+    /// Заголовок группы: в режиме ByArtist — название альбома,
+    /// в режиме ByAlbum — имя исполнителя.
     AlbumHeader { name: String },
     Track { index_in_library: usize },
 }
 
-#[derive(Clone, Copy, PartialEq)]
+#[derive(Clone, Copy, PartialEq, Serialize, Deserialize)]
 pub enum SortMode {
     ByArtist,
+    ByAlbum,
     ByFilename,
 }
 
@@ -25,11 +29,8 @@ pub struct Library {
     pub artist_selected: usize,
     pub right_selected: usize,
     pub sort_mode: SortMode,
-    /// Активный фильтр поиска (пусто — без фильтра)
     pub filter: String,
-    /// Состояние скролла левой панели (сохраняется между кадрами)
     pub left_state: ListState,
-    /// Состояние скролла правой панели
     pub right_state: ListState,
 }
 
@@ -43,7 +44,6 @@ impl Library {
         mode: SortMode,
         filter: String,
     ) -> Self {
-        // Применяем фильтр
         if !filter.is_empty() {
             let f = filter.to_lowercase();
             tracks.retain(|t| {
@@ -54,108 +54,165 @@ impl Library {
         }
 
         match mode {
-            SortMode::ByArtist => {
-                use std::collections::BTreeMap;
+            SortMode::ByArtist => Self::build_by_artist(tracks, mode, filter),
+            SortMode::ByAlbum => Self::build_by_album(tracks, mode, filter),
+            SortMode::ByFilename => Self::build_by_filename(tracks, mode, filter),
+        }
+    }
 
-                let mut map: BTreeMap<String, BTreeMap<String, Vec<Track>>> = BTreeMap::new();
-                for t in tracks.drain(..) {
-                    map.entry(t.artist.clone())
-                        .or_default()
-                        .entry(t.album.clone())
-                        .or_default()
-                        .push(t);
-                }
+    fn build_by_artist(
+        mut tracks: Vec<Track>,
+        mode: SortMode,
+        filter: String,
+    ) -> Self {
+        use std::collections::BTreeMap;
 
-                let mut all_tracks = Vec::new();
-                let mut artists = Vec::new();
+        let mut map: BTreeMap<String, BTreeMap<String, Vec<Track>>> = BTreeMap::new();
+        for t in tracks.drain(..) {
+            map.entry(t.artist.clone())
+                .or_default()
+                .entry(t.album.clone())
+                .or_default()
+                .push(t);
+        }
 
-                for (artist_name, albums_map) in map {
-                    let mut rows = Vec::new();
+        let mut all_tracks = Vec::new();
+        let mut artists = Vec::new();
 
-                    for (album_name, mut album_tracks) in albums_map {
-                        album_tracks.sort_by(|a, b| {
-                            a.track_number
-                                .unwrap_or(u32::MAX)
-                                .cmp(&b.track_number.unwrap_or(u32::MAX))
-                                .then(a.title.cmp(&b.title))
-                        });
+        for (artist_name, albums_map) in map {
+            let mut rows = Vec::new();
 
-                        rows.push(RightRow::AlbumHeader { name: album_name });
-
-                        for t in album_tracks {
-                            let idx = all_tracks.len();
-                            all_tracks.push(t);
-                            rows.push(RightRow::Track {
-                                index_in_library: idx,
-                            });
-                        }
-                    }
-
-                    artists.push(ArtistView {
-                        name: artist_name,
-                        rows,
-                    });
-                }
-
-                // Вычисляем right_selected ДО перемещения artists
-                let right_selected = first_track_row_in(artists.first());
-
-                let mut left_state = ListState::default();
-                let mut right_state = ListState::default();
-                if !artists.is_empty() {
-                    left_state.select(Some(0));
-                }
-                right_state.select(Some(right_selected));
-
-                Library {
-                    all_tracks,
-                    artists,
-                    artist_selected: 0,
-                    right_selected,
-                    sort_mode: mode,
-                    filter,
-                    left_state,
-                    right_state,
-                }
-            }
-
-            SortMode::ByFilename => {
-                tracks.sort_by(|a, b| a.path.cmp(&b.path));
-                let all_tracks = tracks;
-
-                let mut rows = Vec::new();
-                rows.push(RightRow::AlbumHeader {
-                    name: "Все файлы".into(),
+            for (album_name, mut album_tracks) in albums_map {
+                album_tracks.sort_by(|a, b| {
+                    a.track_number
+                        .unwrap_or(u32::MAX)
+                        .cmp(&b.track_number.unwrap_or(u32::MAX))
+                        .then(a.title.cmp(&b.title))
                 });
-                for i in 0..all_tracks.len() {
+
+                rows.push(RightRow::AlbumHeader { name: album_name });
+
+                for t in album_tracks {
+                    let idx = all_tracks.len();
+                    all_tracks.push(t);
                     rows.push(RightRow::Track {
-                        index_in_library: i,
+                        index_in_library: idx,
                     });
                 }
+            }
 
-                let artists = vec![ArtistView {
-                    name: "Все файлы".into(),
-                    rows,
-                }];
+            artists.push(ArtistView {
+                name: artist_name,
+                rows,
+            });
+        }
 
-                let right_selected = first_track_row_in(artists.first());
+        Self::finalize(all_tracks, artists, mode, filter)
+    }
 
-                let mut left_state = ListState::default();
-                left_state.select(Some(0));
-                let mut right_state = ListState::default();
-                right_state.select(Some(right_selected));
+    fn build_by_album(
+        mut tracks: Vec<Track>,
+        mode: SortMode,
+        filter: String,
+    ) -> Self {
+        use std::collections::BTreeMap;
 
-                Library {
-                    all_tracks,
-                    artists,
-                    artist_selected: 0,
-                    right_selected,
-                    sort_mode: mode,
-                    filter,
-                    left_state,
-                    right_state,
+        // Album -> Artist -> Vec<Track>
+        let mut map: BTreeMap<String, BTreeMap<String, Vec<Track>>> = BTreeMap::new();
+        for t in tracks.drain(..) {
+            map.entry(t.album.clone())
+                .or_default()
+                .entry(t.artist.clone())
+                .or_default()
+                .push(t);
+        }
+
+        let mut all_tracks = Vec::new();
+        let mut albums = Vec::new();
+
+        for (album_name, artists_map) in map {
+            let mut rows = Vec::new();
+
+            for (artist_name, mut artist_tracks) in artists_map {
+                artist_tracks.sort_by(|a, b| {
+                    a.track_number
+                        .unwrap_or(u32::MAX)
+                        .cmp(&b.track_number.unwrap_or(u32::MAX))
+                        .then(a.title.cmp(&b.title))
+                });
+
+                // Заголовок группы = имя исполнителя
+                rows.push(RightRow::AlbumHeader { name: artist_name });
+
+                for t in artist_tracks {
+                    let idx = all_tracks.len();
+                    all_tracks.push(t);
+                    rows.push(RightRow::Track {
+                        index_in_library: idx,
+                    });
                 }
             }
+
+            albums.push(ArtistView {
+                name: album_name,
+                rows,
+            });
+        }
+
+        Self::finalize(all_tracks, albums, mode, filter)
+    }
+
+    fn build_by_filename(
+        mut tracks: Vec<Track>,
+        mode: SortMode,
+        filter: String,
+    ) -> Self {
+        tracks.sort_by(|a, b| a.path.cmp(&b.path));
+        let all_tracks = tracks;
+
+        let mut rows = Vec::new();
+        rows.push(RightRow::AlbumHeader {
+            name: "Все файлы".into(),
+        });
+        for i in 0..all_tracks.len() {
+            rows.push(RightRow::Track {
+                index_in_library: i,
+            });
+        }
+
+        let groups = vec![ArtistView {
+            name: "Все файлы".into(),
+            rows,
+        }];
+
+        Self::finalize(all_tracks, groups, mode, filter)
+    }
+
+    /// Общая инициализация ListState и позиций курсора.
+    fn finalize(
+        all_tracks: Vec<Track>,
+        groups: Vec<ArtistView>,
+        mode: SortMode,
+        filter: String,
+    ) -> Self {
+        let right_selected = first_track_row_in(groups.first());
+
+        let mut left_state = ListState::default();
+        let mut right_state = ListState::default();
+        if !groups.is_empty() {
+            left_state.select(Some(0));
+        }
+        right_state.select(Some(right_selected));
+
+        Library {
+            all_tracks,
+            artists: groups,
+            artist_selected: 0,
+            right_selected,
+            sort_mode: mode,
+            filter,
+            left_state,
+            right_state,
         }
     }
 
@@ -191,7 +248,6 @@ impl Library {
         self.artist_selected = new as usize;
         self.right_selected = self.first_track_row();
 
-        // Синхронизируем ListState — иначе ratatui не знает о смене позиции
         self.left_state.select(Some(self.artist_selected));
         self.right_state.select(Some(self.right_selected));
     }
@@ -255,8 +311,8 @@ impl Library {
     }
 }
 
-fn first_track_row_in(artist: Option<&ArtistView>) -> usize {
-    artist
+fn first_track_row_in(group: Option<&ArtistView>) -> usize {
+    group
         .and_then(|a| {
             a.rows
                 .iter()

src/main.rs

@@ -7,7 +7,7 @@ mod ui;
 
 use std::time::Duration;
 
-use crossterm::event::{self, Event, KeyCode, KeyEventKind};
+use crossterm::event::{self, Event, KeyCode, KeyEvent, KeyEventKind, KeyModifiers};
 
 use crate::app::{App, InputMode};
 
@@ -27,6 +27,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     loop {
         app.maybe_advance();
+        app.tick_status();  // ← автосброс статуса через 2 секунды
         app.player.spectrum.recompute();
         terminal.draw(|f| ui::draw(f, &mut app))?;
 
@@ -35,7 +36,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                 if key.kind == KeyEventKind::Release {
                     continue;
                 }
-                if handle_key(key.code, &mut app) {
+                if handle_key(key, &mut app) {
                     app.on_exit();
                     break;
                 }
@@ -47,10 +48,48 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     Ok(())
 }
 
-fn handle_key(code: KeyCode, app: &mut App) -> bool {
-    // Режим поиска
+fn handle_key(key: KeyEvent, app: &mut App) -> bool {
+    let ctrl = key.modifiers.contains(KeyModifiers::CONTROL);
+
+    if key.code == KeyCode::F(1) {
+        app.toggle_help();
+        return false;
+    }
+
+    if app.show_help {
+        if key.code == KeyCode::Esc {
+            app.toggle_help();
+        }
+        return false;
+    }
+
+    if ctrl {
+        match key.code {
+            KeyCode::Right => {
+                app.next_track();
+                return false;
+            }
+            KeyCode::Left => {
+                app.prev_track();
+                return false;
+            }
+            KeyCode::Char(c) => match c.to_ascii_lowercase() {
+                'd' => {
+                    app.next_track();
+                    return false;
+                }
+                'a' => {
+                    app.prev_track();
+                    return false;
+                }
+                _ => {}
+            },
+            _ => {}
+        }
+    }
+
     if app.input_mode == InputMode::Search {
-        match code {
+        match key.code {
             KeyCode::Esc => app.cancel_search(),
             KeyCode::Enter => app.commit_search(),
             KeyCode::Backspace => app.search_pop(),
@@ -60,8 +99,7 @@ fn handle_key(code: KeyCode, app: &mut App) -> bool {
         return false;
     }
 
-    // Обычный режим
-    match code {
+    match key.code {
         KeyCode::Char('+') | KeyCode::Char('=') => {
             app.volume_up();
             return false;
@@ -101,7 +139,7 @@ fn handle_key(code: KeyCode, app: &mut App) -> bool {
         _ => {}
     }
 
-    if let KeyCode::Char(c) = code {
+    if let KeyCode::Char(c) = key.code {
         match c {
             '1'..='9' => {
                 let pct = (c as u8 - b'0') * 10;
@@ -117,7 +155,6 @@ fn handle_key(code: KeyCode, app: &mut App) -> bool {
                 't' => app.toggle_sort(),
                 'f' => app.jump_to_playing(),
                 'g' => {
-                    // 'g' (строчная) — в начало, 'G' (заглавная) — в конец
                     if c == 'G' {
                         app.goto_end();
                     } else {

src/state.rs

@@ -3,13 +3,18 @@ use std::path::PathBuf;
 
 use serde::{Deserialize, Serialize};
 
+use crate::library::SortMode;
+use crate::track::Track;
+
 #[derive(Serialize, Deserialize, Default)]
 pub struct SavedState {
     pub last_path: Option<String>,
     pub volume: Option<f32>,
-    pub sort_by_filename: Option<bool>,
+    pub sort_mode: Option<SortMode>,
     pub repeat: Option<RepeatMode>,
     pub shuffle: Option<bool>,
+    pub last_playing_path: Option<String>,
+    pub last_playing_pos_secs: Option<u64>,
 }
 
 #[derive(Serialize, Deserialize, Clone, Copy, PartialEq, Debug, Default)]
@@ -24,6 +29,10 @@ fn config_path() -> Option<PathBuf> {
     dirs::config_dir().map(|p| p.join("rumus").join("state.toml"))
 }
 
+fn cache_path() -> Option<PathBuf> {
+    dirs::data_dir().map(|p| p.join("rumus").join("library.bin"))
+}
+
 pub fn load() -> SavedState {
     let Some(path) = config_path() else {
         return SavedState::default();
@@ -44,4 +53,39 @@ pub fn save(state: &SavedState) {
     if let Ok(text) = toml::to_string_pretty(state) {
         let _ = fs::write(path, text);
     }
+}
+
+// ── Кэш плейлиста (bincode) ────────────────────────────────────
+
+#[derive(Serialize, Deserialize)]
+pub struct PlaylistCache {
+    pub source_dir: String,
+    pub tracks: Vec<Track>,
+}
+
+pub fn load_cache(expected_dir: &str) -> Option<Vec<Track>> {
+    let path = cache_path()?;
+    let bytes = fs::read(&path).ok()?;
+    let cache: PlaylistCache = bincode::deserialize(&bytes).ok()?;
+    if cache.source_dir == expected_dir {
+        Some(cache.tracks)
+    } else {
+        None
+    }
+}
+
+pub fn save_cache(source_dir: &str, tracks: &[Track]) {
+    let Some(path) = cache_path() else {
+        return;
+    };
+    if let Some(parent) = path.parent() {
+        let _ = fs::create_dir_all(parent);
+    }
+    let cache = PlaylistCache {
+        source_dir: source_dir.to_string(),
+        tracks: tracks.to_vec(),
+    };
+    if let Ok(bytes) = bincode::serialize(&cache) {
+        let _ = fs::write(path, bytes);
+    }
 }

src/track.rs

@@ -3,8 +3,9 @@ use std::time::Duration;
 
 use lofty::file::{AudioFile, TaggedFileExt};
 use lofty::tag::Accessor;
+use serde::{Deserialize, Serialize};
 
-#[derive(Clone)]
+#[derive(Clone, Serialize, Deserialize)]
 pub struct Track {
     pub path: PathBuf,
     pub title: String,
@@ -69,7 +70,6 @@ impl Track {
     }
 }
 
-/// Собирает все аудиофайлы в директории (без сортировки)
 pub fn scan_dir(dir: &str) -> Vec<Track> {
     use walkdir::WalkDir;
     let mut tracks = Vec::new();

src/ui.rs

@@ -1,6 +1,6 @@
 use ratatui::prelude::*;
 use ratatui::widgets::{
-    Bar, BarChart, BarGroup, Block, Borders, List, ListItem, Paragraph,
+    Bar, BarChart, BarGroup, Block, Borders, Clear, List, ListItem, Paragraph,
 };
 
 use crate::app::{App, InputMode, Panel};
@@ -26,9 +26,15 @@ pub fn draw(f: &mut Frame, app: &mut App) {
     draw_right_panel(f, app, top[1]);
     draw_equalizer(f, app, chunks[1]);
     draw_status(f, app, chunks[2]);
+
+    if app.show_help {
+        draw_help(f, f.area());
+    }
 }
 
 fn draw_left_panel(f: &mut Frame, app: &mut App, area: Rect) {
+    f.render_widget(Clear, area);
+
     let items: Vec<ListItem> = app
         .library
         .artists
@@ -49,8 +55,14 @@ fn draw_left_panel(f: &mut Frame, app: &mut App, area: Rect) {
     };
     app.library.left_state.select(sel);
 
+    let title = match app.library.sort_mode {
+        SortMode::ByArtist => " Исполнители ",
+        SortMode::ByAlbum => " Альбомы ",
+        SortMode::ByFilename => " Источник ",
+    };
+
     let list = List::new(items)
-        .block(Block::default().borders(Borders::ALL).title(" Исполнители "))
+        .block(Block::default().borders(Borders::ALL).title(title))
         .highlight_style(highlight)
         .highlight_symbol("> ");
 
@@ -66,6 +78,8 @@ fn fmt_dur(d: std::time::Duration) -> String {
 }
 
 fn draw_right_panel(f: &mut Frame, app: &mut App, area: Rect) {
+    f.render_widget(Clear, area);
+
     let rows = app.library.current_right_rows();
 
     let items: Vec<ListItem> = rows
@@ -137,20 +151,31 @@ fn draw_right_panel(f: &mut Frame, app: &mut App, area: Rect) {
         })
         .collect();
 
+    let selected_name = app
+        .library
+        .artists
+        .get(app.library.artist_selected)
+        .map(|a| a.name.as_str())
+        .unwrap_or("—");
+
     let title = match app.library.sort_mode {
         SortMode::ByArtist => {
-            let artist_name = app
-                .library
-                .artists
-                .get(app.library.artist_selected)
-                .map(|a| a.name.as_str())
-                .unwrap_or("—");
             if app.library.filter.is_empty() {
-                format!(" Альбомы и треки — {} ", artist_name)
+                format!(" Альбомы и треки — {} ", selected_name)
             } else {
                 format!(
                     " Альбомы и треки — {} [{}] ",
-                    artist_name, app.library.filter
+                    selected_name, app.library.filter
+                )
+            }
+        }
+        SortMode::ByAlbum => {
+            if app.library.filter.is_empty() {
+                format!(" Исполнители и треки — {} ", selected_name)
+            } else {
+                format!(
+                    " Исполнители и треки — {} [{}] ",
+                    selected_name, app.library.filter
                 )
             }
         }
@@ -235,8 +260,6 @@ fn draw_equalizer(f: &mut Frame, app: &App, area: Rect) {
 }
 
 fn draw_status(f: &mut Frame, app: &App, area: Rect) {
-    // Раскладка нижней строки:
-    // [ Статус ................. ] [ 01:23 / 03:45 ] [ Mode ] [ vol: NN% ]
     let inner = Layout::default()
         .direction(Direction::Horizontal)
         .constraints([
@@ -247,7 +270,6 @@ fn draw_status(f: &mut Frame, app: &App, area: Rect) {
         ])
         .split(area);
 
-    // ── Статус / поиск / пауза ────────────────────────────────
     let (status_text, status_title) = if app.input_mode == InputMode::Search {
         (format!("> {}", app.search_buffer), " Поиск ")
     } else {
@@ -259,7 +281,6 @@ fn draw_status(f: &mut Frame, app: &App, area: Rect) {
         .block(Block::default().borders(Borders::ALL).title(status_title));
     f.render_widget(status, inner[0]);
 
-    // ── Время: текущее / полное ───────────────────────────────
     let (pos, total) = app.progress();
     let time_text = format!(
         "{:02}:{:02} / {:02}:{:02}",
@@ -270,11 +291,9 @@ fn draw_status(f: &mut Frame, app: &App, area: Rect) {
     );
     let time = Paragraph::new(time_text)
         .alignment(Alignment::Center)
-		.style(Style::default().fg(Color::Rgb(70, 130, 180)))
         .block(Block::default().borders(Borders::ALL).title(" Время "));
     f.render_widget(time, inner[1]);
 
-    // ── Repeat / Shuffle ──────────────────────────────────────
     let mode_str = match (app.repeat, app.shuffle) {
         (RepeatMode::Off, false) => "".to_string(),
         (RepeatMode::Off, true) => "SHUF".to_string(),
@@ -288,10 +307,74 @@ fn draw_status(f: &mut Frame, app: &App, area: Rect) {
         .block(Block::default().borders(Borders::ALL).title(" Mode "));
     f.render_widget(mode, inner[2]);
 
-    // ── Громкость ─────────────────────────────────────────────
     let vol_text = format!("vol: {}%", (app.player.volume() * 100.0) as u32);
     let vol = Paragraph::new(vol_text)
         .alignment(Alignment::Center)
-        .block(Block::default().borders(Borders::ALL).title(" Звук "));
+        .block(Block::default().borders(Borders::ALL).title(" "));
     f.render_widget(vol, inner[3]);
+}
+
+fn draw_help(f: &mut Frame, screen: Rect) {
+    let width = 60u16.min(screen.width.saturating_sub(4));
+    let height = 34u16.min(screen.height.saturating_sub(4));
+
+    let x = (screen.width.saturating_sub(width)) / 2;
+    let y = (screen.height.saturating_sub(height)) / 2;
+    let area = Rect::new(x, y, width, height);
+
+    f.render_widget(Clear, area);
+
+    let header = Style::default()
+        .fg(Color::Yellow)
+        .add_modifier(Modifier::BOLD);
+    let title_color = Style::default().fg(Color::Rgb(100, 149, 237));
+
+    let help_text = vec![
+        Line::from(Span::styled(
+            "  Управление плеером  ",
+            title_color.add_modifier(Modifier::BOLD),
+        )),
+        Line::from(""),
+        Line::from(Span::styled("  Навигация", header)),
+        Line::from("  w / ↑          вверх по списку"),
+        Line::from("  s / ↓          вниз по списку"),
+        Line::from("  Tab            переключить панель"),
+        Line::from("  g / G          в начало / в конец списка"),
+        Line::from("  f              к играющему треку"),
+        Line::from(""),
+        Line::from(Span::styled("  Воспроизведение", header)),
+        Line::from("  Enter          играть выделенный трек"),
+        Line::from("  Space          пауза / продолжить"),
+        Line::from("  z              стоп"),
+        Line::from("  Ctrl+→ / Ctrl+d   следующий трек"),
+        Line::from("  Ctrl+← / Ctrl+a   предыдущий трек"),
+        Line::from("  r              repeat: off → all → one"),
+        Line::from("  x              shuffle вкл/выкл"),
+        Line::from(""),
+        Line::from(Span::styled("  Перемотка", header)),
+        Line::from("  a / ←          −5 секунд"),
+        Line::from("  d / →          +5 секунд"),
+        Line::from("  1..9           перейти к 10%..90% трека"),
+        Line::from(""),
+        Line::from(Span::styled("  Звук и прочее", header)),
+        Line::from("  + / -          громкость"),
+        Line::from("  /              поиск"),
+        Line::from("  t              сортировка: артист → альбом → файл"),
+        Line::from("  F1             эта справка"),
+        Line::from("  q / Esc        выход"),
+        Line::from(""),
+        Line::from(Span::styled(
+            "  F1 или Esc — закрыть  ",
+            Style::default().fg(Color::DarkGray),
+        )),
+    ];
+
+    let help = Paragraph::new(help_text).block(
+        Block::default()
+            .borders(Borders::ALL)
+            .border_style(title_color)
+            .title(" Помощь "),
+    );
+
+    f.render_widget(help, area);
 }