// cueSheetForFile returns parsed CUE file for the given audio file.
// Example. Given a FLAC file path it returns a CUE sheet found in the
// same directory which describes the FLAC file.
func cueSheetForFile(p *Path) (*cue.Sheet, error) {
base := p.Base()
parent, err := p.Parent()
if err != nil {
return nil, err
}
file, err := os.Open(parent.File())
if err != nil {
return nil, err
}
defer file.Close()
names, err := file.Readdirnames(-1)
if err != nil {
return nil, err
}
for _, name := range names {
if ext(name) == cueExt {
child, err := parent.Child(name)
if err != nil {
continue
}
sheet, err := cue.ParseFile(child.File())
if err != nil {
return nil, err
}
for _, f := range sheet.Files {
if f.Name == base {
return sheet, nil
}
}
}
}
return nil, nil
}
// readTracks returns sorted tracks list in the given directory.
// Parameter is garanteed to be a folder.
func readTracks(p *Path) ([]Entry, error) {
file, err := os.Open(p.File())
if err != nil {
return nil, err
}
defer file.Close()
names, err := file.Readdirnames(-1)
if err != nil {
return nil, err
}
sort.Strings(names)
// Process CUE files first and then only audio files which was not
// found inside CUE ones.
tracks := make([]Entry, 0, len(names))
// Standalone audio files.
standaloneFiles := make([]string, 0, len(names))
// Files used in CUEs. As far as tracks for them were generated from
// corresponding CUE file they must not be processed as standalone.
cueFiles := make([]string, 0, len(names))
for _, name := range names {
cp, err := p.Child(name)
if err != nil {
return nil, err
}
if cp.IsDir() {
continue
}
if cp.Ext() == cueExt {
sheet, err := cue.ParseFile(cp.File())
if err != nil {
continue
}
cueTracks, err := cueSheetTracks(p, sheet)
if err != nil {
continue
}
tracks = append(tracks, cueTracks...)
for _, f := range sheet.Files {
cueFiles = append(
cueFiles, f.Name)
}
} else {
standaloneFiles = append(standaloneFiles, name)
}
}
// Now process non-cue audio files.
sort.Strings(cueFiles)
for _, name := range standaloneFiles {
if stringsPresent(cueFiles, name) {
continue
}
pp, err := p.Child(name)
if err != nil {
// TODO: Log ignored file.
} else {
ext := strings.ToLower(pp.Ext())
if format(ext) != nil {
track, err := pp.Track()
if err != nil {
panic("not track")
}
tracks = append(tracks, track)
}
}
}
return tracks, nil
}