eg

scanner/utilities.go

@@ -0,0 +1,69 @@
+package scanner
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/dhowden/tag"
+)
+
+var audioExtensions = map[string]string{
+	"mp3":  "audio/mpeg",
+	"flac": "audio/x-flac",
+	"aac":  "audio/x-aac",
+	"m4a":  "audio/m4a",
+	"ogg":  "audio/ogg",
+}
+
+func isAudio(fullPath string) (string, string, bool) {
+	exten := filepath.Ext(fullPath)[1:]
+	mine, ok := audioExtensions[exten]
+	if !ok {
+		return "", "", false
+	}
+	return mine, exten, true
+}
+
+var coverFilenames = map[string]bool{
+	"cover.png":   true,
+	"cover.jpg":   true,
+	"cover.jpeg":  true,
+	"folder.png":  true,
+	"folder.jpg":  true,
+	"folder.jpeg": true,
+	"album.png":   true,
+	"album.jpg":   true,
+	"album.jpeg":  true,
+	"front.png":   true,
+	"front.jpg":   true,
+	"front.jpeg":  true,
+}
+
+func isCover(fullPath string) bool {
+	_, filename := path.Split(fullPath)
+	_, ok := coverFilenames[strings.ToLower(filename)]
+	return ok
+}
+
+func readTags(fullPath string) (tag.Metadata, error) {
+	trackData, err := os.Open(fullPath)
+	if err != nil {
+		return nil, fmt.Errorf("when tags from disk: %v", err)
+	}
+	defer trackData.Close()
+	tags, err := tag.ReadFrom(trackData)
+	if err != nil {
+		return nil, err
+	}
+	return tags, nil
+}
+
+func logElapsed(start time.Time, name string) {
+	elapsed := time.Since(start)
+	log.Printf("finished %s in %s\n", name, elapsed)
+}