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Document the scrobblerlog package

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Philipp Wolfer 2025-05-01 13:22:20 +02:00
parent 91c28bac0c
commit 588a6cf96f
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1 changed files with 22 additions and 1 deletions
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23
pkg/scrobblerlog/parser.go
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@ -20,11 +20,18 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
// Package to parse and writer .scrobbler.log files as written by Rockbox.
// Package to parse and write .scrobbler.log files as written by Rockbox.
//
// The parser supports reading version 1.1 and 1.0 of the scrobbler log file
// format. The latter is only supported if encoded in UTF-8.
//
// When written it always writes version 1.1 of the scrobbler log file format,
// which includes the MusicBrainz recording ID as the last field of each row.
//
// See
// - https://www.rockbox.org/wiki/LastFMLog
// - https://git.rockbox.org/cgit/rockbox.git/tree/apps/plugins/lastfm_scrobbler.c
// - https://web.archive.org/web/20110110053056/http://www.audioscrobbler.net/wiki/Portable_Player_Logging
package scrobblerlog
import (
@ -79,6 +86,10 @@ type ScrobblerLog struct {
FallbackTimezone *time.Location
}
// Parses a scrobbler log file from the given reader.
//
// The reader must provide a valid scrobbler log file with a valid header.
// This function implicitly calls [ScrobblerLog.ReadHeader].
func (l *ScrobblerLog) Parse(data io.Reader, ignoreSkipped bool) error {
l.Records = make([]Record, 0)
@ -106,6 +117,7 @@ func (l *ScrobblerLog) Parse(data io.Reader, ignoreSkipped bool) error {
// fmt.Printf("row: %v\n", row)
// We consider only the last field (recording MBID) optional
// This was added in the 1.1 file format.
if len(row) < 7 {
line, _ := tsvReader.FieldPos(0)
return fmt.Errorf("invalid record in scrobblerlog line %v", line)
@ -126,6 +138,11 @@ func (l *ScrobblerLog) Parse(data io.Reader, ignoreSkipped bool) error {
return nil
}
// Append writes the given records to the writer.
//
// The writer should be for an existing scrobbler log file or
// [ScrobblerLog.WriteHeader] should be called before this function.
// Returns the last timestamp of the records written.
func (l *ScrobblerLog) Append(data io.Writer, records []Record) (lastTimestamp time.Time, err error) {
tsvWriter := csv.NewWriter(data)
tsvWriter.Comma = '\t'
@ -153,6 +170,9 @@ func (l *ScrobblerLog) Append(data io.Writer, records []Record) (lastTimestamp t
return
}
// Parses just the header of a scrobbler log file from the given reader.
//
// This function sets [ScrobblerLog.TZ] and [ScrobblerLog.Client].
func (l *ScrobblerLog) ReadHeader(reader *bufio.Reader) error {
// Skip header
for i := 0; i < 3; i++ {
@ -191,6 +211,7 @@ func (l *ScrobblerLog) ReadHeader(reader *bufio.Reader) error {
return nil
}
// Writes the header of a scrobbler log file to the given writer.
func (l *ScrobblerLog) WriteHeader(writer io.Writer) error {
headers := []string{
"#AUDIOSCROBBLER/1.1\n",