65 lines
1.3 KiB
Go
65 lines
1.3 KiB
Go
package radio
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import (
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"os"
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"strings"
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"sync"
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"github.com/pkg/errors"
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)
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// Playlist holds a list of paths to a song files.
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type Playlist struct {
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sync.Mutex
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filePath string
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playlist []string
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cur int
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repeat bool
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}
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// NewPlaylist returns an instance of a Playlist struct with a loaded playlist.
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// Returns an error if failed to load a playlist file.
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func NewPlaylist(filePath string, repeat bool) (*Playlist, error) {
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p := &Playlist{filePath: filePath, repeat: repeat}
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return p, p.load()
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}
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// Next returns the next song to play. Returns an empty string if repeat is
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// false and the end of a playlist was reached.
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func (p *Playlist) Next() (song string) {
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if p.cur == len(p.playlist) {
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// If the end of a playlist was reached and repeat is set to true,
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// then go back to the head of it, thus repeating it. Return an empty
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// string otherwise.
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if p.repeat {
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p.cur = 0
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} else {
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return ""
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}
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}
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song = p.playlist[p.cur]
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p.cur++
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return
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}
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// Load reads a playlist file.
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func (p *Playlist) load() error {
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data, err := os.ReadFile(p.filePath)
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if err != nil {
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return errors.Wrap(err, "cannot open a playlist file")
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}
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if len(data) == 0 {
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return errors.New("a playlist file is empty. Did not update")
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}
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p.playlist = strings.Split(string(data), "\n")
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p.cur = 0
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return nil
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}
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func (p *Playlist) Reload() error {
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return p.load()
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}
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