tools: move to cmd subdir

cmd/tag/main.go

@@ -0,0 +1,102 @@
+// Copyright 2015, David Howden
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+The tag tool reads metadata from media files (as supported by the tag library).
+*/
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/dhowden/tag"
+	"github.com/dhowden/tag/mbz"
+)
+
+var raw bool
+var extractMBZ bool
+
+var usage = func() {
+	fmt.Fprintf(os.Stderr, "usage: %s [optional flags] filename\n", os.Args[0])
+	flag.PrintDefaults()
+}
+
+func init() {
+	flag.BoolVar(&raw, "raw", false, "show raw tag data")
+	flag.BoolVar(&extractMBZ, "mbz", false, "extract MusicBrainz tag data (if available)")
+
+	flag.Usage = usage
+}
+
+func main() {
+	flag.Parse()
+
+	if flag.NArg() != 1 {
+		usage()
+		return
+	}
+
+	f, err := os.Open(flag.Arg(0))
+	if err != nil {
+		fmt.Printf("error loading file: %v", err)
+		return
+	}
+	defer f.Close()
+
+	m, err := tag.ReadFrom(f)
+	if err != nil {
+		fmt.Printf("error reading file: %v\n", err)
+		return
+	}
+
+	printMetadata(m)
+
+	if raw {
+		fmt.Println()
+		fmt.Println()
+
+		tags := m.Raw()
+		for k, v := range tags {
+			if _, ok := v.(*tag.Picture); ok {
+				fmt.Printf("%#v: %v\n", k, v)
+				continue
+			}
+			fmt.Printf("%#v: %#v\n", k, v)
+		}
+	}
+
+	if extractMBZ {
+		b, err := json.MarshalIndent(mbz.Extract(m), "", "  ")
+		if err != nil {
+			fmt.Printf("error marshalling MusicBrainz info: %v\n", err)
+			return
+		}
+
+		fmt.Printf("\nMusicBrainz Info:\n%v\n", string(b))
+	}
+}
+
+func printMetadata(m tag.Metadata) {
+	fmt.Printf("Metadata Format: %v\n", m.Format())
+	fmt.Printf("File Type: %v\n", m.FileType())
+
+	fmt.Printf(" Title: %v\n", m.Title())
+	fmt.Printf(" Album: %v\n", m.Album())
+	fmt.Printf(" Artist: %v\n", m.Artist())
+	fmt.Printf(" Composer: %v\n", m.Composer())
+	fmt.Printf(" Genre: %v\n", m.Genre())
+	fmt.Printf(" Year: %v\n", m.Year())
+
+	track, trackCount := m.Track()
+	fmt.Printf(" Track: %v of %v\n", track, trackCount)
+
+	disc, discCount := m.Disc()
+	fmt.Printf(" Disc: %v of %v\n", disc, discCount)
+
+	fmt.Printf(" Picture: %v\n", m.Picture())
+	fmt.Printf(" Lyrics: %v\n", m.Lyrics())
+}