split code into library and binary

cmd/main.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"fmt"
+	"honnef.co/go/id3"
+	"os"
+)
+
+func main() {
+	id3.Logging = true
+	tags, err := id3.Open(os.Args[1])
+	if err != nil {
+		panic(err)
+	}
+
+	err = tags.Parse()
+	if err != nil {
+		panic(err)
+	}
+
+	tags.Clear() // Remove all existing tags
+	tags.SetArtists([]string{"dominikh", "some other güy"})
+	fmt.Println(tags.Save())
+	// tags.SetTitle("A test file.")
+	// tags.SetAlbum("Proud test productions")
+	// tags.SetArtist("dominikh")
+	// // tags.SetTrack(1)
+	// tags.SetRecordingTime(time.Date(2009, 11, 10, 23, 0, 0, 0, time.UTC))
+	// tags.SetPublisher("Gophers united")
+	// tags.SetBPM(200) // utz utz utz
+	// fmt.Println(tags.Save())
+}

doc.go

@@ -0,0 +1,44 @@
+/*
+Foo bar.
+
+Supported versions
+
+This library supports reading v2.3 and v2.4 tags, but only writing
+v2.4 tags.
+
+The primary reason for not allowing writing older versions is that
+they cannot represent all data that is available with v2.4, and
+designing the API in a way that's both user friendly and able to
+reject data is not worth the trouble.
+
+Automatic upgrading
+
+The library's internal representation of tags matches that of v2.4.
+When tags with an older version are being read, they will be
+automatically converted to v2.4.
+
+One consequence of this is that when you read a file with v2.3 tags
+and immediately save it, it will now be a file with valid v2.4 tags.
+
+The upgrade process makes following changes to the tags:
+
+  - TYER, TDAT and TIME get replaced by TDRC
+  - TORY gets replaced by TDOR
+  - XDOR gets replaced by TDOR
+  - The slash as a separator for multiple values gets replaced by null bytes
+
+One special case is the TRDA frame because there is no way to
+automatically convert it to v2.4. The upgrade process will not
+directly delete the frame, so that you can manually upgrade it if
+desired, but it won't be written back to the file. In reality, the frame
+should be both rarely used and insignifcant enough to be a big loss.
+
+
+Accessing and manipulating frames
+
+There are two ways to access frames: Using provided getter and setter
+methods (there is one for every standard frame), and working directly
+with the underlying frames.
+
+*/
+package id3

frames.go

@@ -1,4 +1,4 @@
-package main
+package id3
 
 import (
 	"bytes"

genres.go

@@ -1,4 +1,4 @@
-package main
+package id3
 
 var Genres = []string{
 	"Blues",