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metadata.go
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/
metadata.go
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package internal
import (
"bytes"
"fmt"
"io/fs"
"errors"
"github.com/dhowden/tag"
"path/filepath"
"regexp"
)
var (
multipleUnderscoresRegex = regexp.MustCompile(`_{2,}`)
ErrMissingMetadataError = errors.New("missing metadata")
)
func computeDestinationPath(fsys fs.FS, overrides MetadataOverride, path string) (string, error) {
content, err := fs.ReadFile(fsys, path)
if err != nil {
return "", fmt.Errorf("error reading file: %w", err)
}
metadata, err := tag.ReadFrom(bytes.NewReader(content))
if err != nil {
return "", fmt.Errorf("error parsing metadata: %w", err)
}
if metadata.Artist() == "" && overrides.Artist == "" && metadata.AlbumArtist() == "" {
return "", fmt.Errorf("%w: artist", ErrMissingMetadataError)
}
if metadata.Album() == "" && overrides.Album == "" {
return "", fmt.Errorf("%w: album", ErrMissingMetadataError)
}
if metadata.Title() == "" {
return "", fmt.Errorf("%w: title", ErrMissingMetadataError)
}
track, _ := metadata.Track()
if track == 0 {
return "", fmt.Errorf("%w: track", ErrMissingMetadataError)
}
artist := overrides.Artist
if artist == "" {
if metadata.AlbumArtist() != "" {
artist = metadata.AlbumArtist()
} else {
artist = metadata.Artist()
}
}
album := overrides.Album
if album == "" {
album = metadata.Album()
}
return filepath.Join(
escape(artist),
escape(album),
fmt.Sprintf("%02d_%v", track, escape(metadata.Title())),
) + filepath.Ext(path), nil
}
func escape(s string) string {
runes := []rune{}
for _, r := range s {
switch r {
case '"', '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '<', '>', '?', ':', '{', '}', '[', ']', '\'', '-', ',', '.':
continue
case ' ':
runes = append(runes, '_')
default:
runes = append(runes, r)
}
}
return multipleUnderscoresRegex.ReplaceAllString(string(runes), "_")
}