feat: add refetch lyrics shortcut (r key)

- Add DeleteCache() to remove cached lyrics/translations/covers
- Add DeleteLocalLyrics() to remove local .lrc/.lyric files
- Add refetch() in player model to re-fetch lyrics from scratch
- Update help panel to show 'd' and 'r' keybindings
- Update README and README_zh keybinding tables

Author: pykeguo

README.md

@@ -103,6 +103,7 @@ lyrics
 | `q` `Ctrl+C` | Quit           |
 | `?`          | Toggle help    |
 | `d`          | Toggle debug   |
+| `r`          | Refetch lyrics |
 
 ### How lyrics are resolved
 

README_zh.md

@@ -103,6 +103,7 @@ lyrics
 | `q` `Ctrl+C` | 退出 |
 | `?`          | 帮助 |
 | `d`          | 调试 |
+| `r`          | 重新获取歌词 |
 
 ### 歌词解析逻辑
 

internal/lyric/cache.go

@@ -94,6 +94,12 @@ func SaveCoverToCache(artist, title string, data []byte) error {
 	return os.WriteFile(CacheCoverPath(artist, title), data, 0644)
 }
 
+func DeleteCache(artist, title string) {
+	os.Remove(CachePath(artist, title))
+	os.Remove(CacheTransPath(artist, title))
+	os.Remove(CacheCoverPath(artist, title))
+}
+
 func splitLines(data []byte) []string {
 	return splitLinesStr(string(data))
 }

internal/lyric/loader.go

@@ -227,6 +227,24 @@ func loadEmbedded(path string) []Line {
 	return BuildLines(lines, nil)
 }
 
+func DeleteLocalLyrics(file, title string) {
+	dir, name, ok := util.SplitPath(file)
+	if !ok {
+		return
+	}
+
+	bases := []string{dir + "/" + name}
+	if len(title) > 0 && title != name {
+		bases = append(bases, dir+"/"+title)
+	}
+
+	for _, b := range bases {
+		for _, ext := range []string{".lyric", ".lrc", ".t.lyric", ".t.lrc"} {
+			os.Remove(b + ext)
+		}
+	}
+}
+
 func SaveToLocal(file, title, lrc, tlyric string) error {
 	dir, name, ok := util.SplitPath(file)
 	if !ok {

internal/player/model.go

@@ -70,6 +70,8 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		case "d":
 			m.showDebug = !m.showDebug
 			return m, nil
+		case "r":
+			return m.refetch()
 		}
 
 	case tea.WindowSizeMsg:
@@ -122,6 +124,35 @@ func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	return m, nil
 }
 
+func (m Model) refetch() (tea.Model, tea.Cmd) {
+	lyric.DeleteLocalLyrics(m.track.File, m.track.Title)
+	lyric.DeleteCache(m.track.Artist, m.track.Title)
+
+	m.lyrics = nil
+	m.curFile = ""
+	m.lyricSource = "refetching"
+	m.fetchingMsg = "refetching lyrics..."
+	m.fetching = true
+	m.errMsg = ""
+
+	file := m.track.File
+	dt := m.track.Duration
+	artist := m.track.Artist
+	title := m.track.Title
+	cmd := func() tea.Msg {
+		lrc, tlyric, err := lyric.FetchContent(file, dt, artist, title)
+		return fetchDoneMsg{
+			file:   file,
+			artist: artist,
+			title:  title,
+			lrc:    lrc,
+			tlyric: tlyric,
+			err:    err,
+		}
+	}
+	return m, cmd
+}
+
 func (m Model) poll() (Model, tea.Cmd) {
 	track := cmus.Remote()
 	m.track = track

internal/player/view.go

@@ -284,6 +284,8 @@ func (m Model) renderHelp() string {
 	keys := []struct{ key, desc string }{
 		{"q / Ctrl+C", "quit"},
 		{"?", "toggle help"},
+		{"d", "toggle debug"},
+		{"r", "refetch lyrics"},
 	}
 
 	helpLines := make([]string, 0, len(keys))