fix ci

Optimize: algorithm in `kgm`

.github/workflows/build.yml

@@ -17,17 +17,23 @@ on:
 
 jobs:
   test:
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
     strategy:
       matrix:
-        os: [ windows-latest, ubuntu-latest, macos-latest ]
         include:
-          - os: ubuntu-latest
+          - target: "linux/amd64"
+            GOOS: "linux"
+            GOARCH: "amd64"
             BIN_SUFFIX: ""
-          - os: macos-latest
+          - target: "windows/amd64"
-            BIN_SUFFIX: ""
+            GOOS: "windows"
-          - os: windows-latest
+            GOARCH: "amd64"
             BIN_SUFFIX: ".exe"
+          - target: "darwin/amd64"
+            GOOS: "darwin"
+            GOARCH: "amd64"
+            BIN_SUFFIX: ""
+
     steps:
       - name: Checkout codebase
         uses: actions/checkout@v2
@@ -37,7 +43,7 @@ jobs:
       - name: Set up Go 1.x
         uses: actions/setup-go@v2
         with:
-          go-version: ^1.16
+          go-version: ^1.17
 
       - name: Setup vars
         id: vars
@@ -47,11 +53,13 @@ jobs:
 
       - name: Build
         env:
+          GOOS: ${{ matrix.GOOS }}
+          GOARCH: ${{ matrix.GOARCH }}
           CGO_ENABLED: 0
-        run: go build -trimpath -ldflags="-w -s -X main.AppVersion=${{ steps.vars.outputs.git_tag }}" -v -o um-${{ runner.os }}${{ matrix.BIN_SUFFIX }} ./cmd/um
+        run: go build -v -trimpath -ldflags="-w -s -X main.AppVersion=${{ steps.vars.outputs.git_tag }}" -o um-${{ matrix.GOOS }}-${{ matrix.GOARCH }}${{ matrix.BIN_SUFFIX }} ./cmd/um
 
       - name: Publish artifact
         uses: actions/upload-artifact@v2
         with:
-          name: um-${{ runner.os }}${{ matrix.BIN_SUFFIX }}
+          name: um-${{ matrix.GOOS }}-${{ matrix.GOARCH }}
-          path: ./um-${{ runner.os }}${{ matrix.BIN_SUFFIX }}
+          path: ./um-${{ matrix.GOOS }}-${{ matrix.GOARCH }}${{ matrix.BIN_SUFFIX }}

.github/workflows/release.yml

@@ -0,0 +1,84 @@
+name: Create Release
+
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  create_release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Get current time
+        id: date
+        run: echo "::set-output name=date::$(date +'%Y/%m/%d')"
+
+      - name: Create release
+        id: release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: "Build ${{ steps.date.outputs.date }}"
+          draft: true
+    outputs:
+      upload_url: "${{ steps.release.outputs.upload_url }}"
+  build:
+    needs:
+      - create_release
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - target: "linux/amd64"
+            GOOS: "linux"
+            GOARCH: "amd64"
+            BIN_SUFFIX: ""
+          - target: "windows/amd64"
+            GOOS: "windows"
+            GOARCH: "amd64"
+            BIN_SUFFIX: ".exe"
+          - target: "windows/386"
+            GOOS: "windows"
+            GOARCH: "386"
+            BIN_SUFFIX: ".exe"
+          - target: "darwin/amd64"
+            GOOS: "darwin"
+            GOARCH: "amd64"
+            BIN_SUFFIX: ""
+
+    steps:
+      - name: Checkout codebase
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Setup vars
+        id: vars
+        run: |
+          echo "::set-output name=short_sha::$(git rev-parse --short HEAD)"
+          echo "::set-output name=git_tag::$(git describe --tags --always)"
+
+      - name: Set up Go 1.x
+        uses: actions/setup-go@v2
+        with:
+          go-version: ^1.17
+
+      - name: Build
+        env:
+          GOOS: ${{ matrix.GOOS }}
+          GOARCH: ${{ matrix.GOARCH }}
+          CGO_ENABLED: 0
+        run: go build -trimpath -v -ldflags="-w -s -X main.AppVersion=${{ steps.vars.outputs.git_tag }}" -o um ./cmd/um
+
+      - name: Upload release assets
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ needs.create_release.outputs.upload_url }}
+          asset_path: um
+          asset_name: um-${{ matrix.GOOS }}-${{ matrix.GOARCH }}${{ matrix.BIN_SUFFIX }}
+          asset_content_type: application/octet-stream
+

README.md

@@ -1,18 +1,25 @@
 # Unlock Music Project - CLI Edition
+
 Original: Web Edition https://github.com/ix64/unlock-music
+
 - [Release Download](https://github.com/unlock-music/cli/releases/latest)
 
 ## Features
+
 - [x] All Algorithm Supported By `ix64/unlock-music`
 - [ ] Complete Cover Image
 - [ ] Parse Meta Data
 - [ ] Complete Meta Data
 
 ## Hou to Build
-- Requirements: **Golang 1.16**
+
+- Requirements: **Golang 1.17**
 
 1. Clone this repo `git clone https://github.com/unlock-music/cli && cd cli`
 2. Build the executable `go build ./cmd/um`
 
 ## How to use
+
+- Drag the encrypted file to `um.exe` (Tested on Windows)
+- Run: `./um [-o <output dir>] [-i] <input dir/file>`
 - Use `./um -h` to show help menu

algo/common/dispatch.go

@@ -1,12 +1,30 @@
 package common
 
+import (
+	"path/filepath"
+	"strings"
+)
+
 type NewDecoderFunc func([]byte) Decoder
 
-var decoderRegistry = make(map[string][]NewDecoderFunc)
+type decoderItem struct {
+	noop    bool
+	decoder NewDecoderFunc
+}
 
-func RegisterDecoder(ext string, dispatchFunc NewDecoderFunc) {
+var decoderRegistry = make(map[string][]decoderItem)
-	decoderRegistry[ext] = append(decoderRegistry[ext], dispatchFunc)
+
+func RegisterDecoder(ext string, noop bool, dispatchFunc NewDecoderFunc) {
+	decoderRegistry[ext] = append(decoderRegistry[ext],
+		decoderItem{noop: noop, decoder: dispatchFunc})
 }
-func GetDecoder(ext string) []NewDecoderFunc {
+func GetDecoder(filename string, skipNoop bool) (rs []NewDecoderFunc) {
-	return decoderRegistry[ext]
+	ext := strings.ToLower(strings.TrimLeft(filepath.Ext(filename), "."))
+	for _, dec := range decoderRegistry[ext] {
+		if skipNoop && dec.noop {
+			continue
+		}
+		rs = append(rs, dec.decoder)
+	}
+	return
 }

algo/common/raw.go

@@ -1,17 +1,27 @@
 package common
 
+import (
+	"errors"
+	"strings"
+)
+
 type RawDecoder struct {
 	file     []byte
 	audioExt string
 }
 
-//goland:noinspection GoUnusedExportedFunction
 func NewRawDecoder(file []byte) Decoder {
 	return &RawDecoder{file: file}
 }
 
-func (d RawDecoder) Validate() error {
+func (d *RawDecoder) Validate() error {
-	return nil
+	for ext, sniffer := range snifferRegistry {
+		if sniffer(d.file) {
+			d.audioExt = strings.ToLower(ext)
+			return nil
+		}
+	}
+	return errors.New("audio doesn't recognized")
 }
 
 func (d RawDecoder) Decode() error {
@@ -27,21 +37,19 @@ func (d RawDecoder) GetAudioData() []byte {
 }
 
 func (d RawDecoder) GetAudioExt() string {
-	return "." + d.audioExt
+	return d.audioExt
 }
 
 func (d RawDecoder) GetMeta() Meta {
 	return nil
 }
-func DecoderFuncWithExt(ext string) NewDecoderFunc {
+
-	return func(file []byte) Decoder {
-		return &RawDecoder{file: file, audioExt: ext}
-	}
-}
 func init() {
-	/*RegisterDecoder("mp3", DecoderFuncWithExt("mp3"))
+	RegisterDecoder("mp3", true, NewRawDecoder)
-	RegisterDecoder("flac", DecoderFuncWithExt("flac"))
+	RegisterDecoder("flac", true, NewRawDecoder)
-	RegisterDecoder("wav", DecoderFuncWithExt("wav"))
+	RegisterDecoder("ogg", true, NewRawDecoder)
-	RegisterDecoder("ogg", DecoderFuncWithExt("ogg"))
+	RegisterDecoder("m4a", true, NewRawDecoder)
-	RegisterDecoder("m4a", DecoderFuncWithExt("m4a"))*/
+	RegisterDecoder("wav", true, NewRawDecoder)
+	RegisterDecoder("wma", true, NewRawDecoder)
+	RegisterDecoder("aac", true, NewRawDecoder)
 }

algo/common/sniff.go

@@ -5,12 +5,14 @@ import "bytes"
 type Sniffer func(header []byte) bool
 
 var snifferRegistry = map[string]Sniffer{
-	".m4a":  SnifferM4A,
+	".mp3":  SnifferMP3,
-	".ogg":  SnifferOGG,
 	".flac": SnifferFLAC,
+	".ogg":  SnifferOGG,
+	".m4a":  SnifferM4A,
 	".wav":  SnifferWAV,
 	".wma":  SnifferWMA,
-	".mp3":  SnifferMP3,
+	".aac":  SnifferAAC,
+	".dff":  SnifferDFF,
 }
 
 func SniffAll(header []byte) (string, bool) {
@@ -42,3 +44,12 @@ func SnifferWAV(header []byte) bool {
 func SnifferWMA(header []byte) bool {
 	return bytes.HasPrefix(header, []byte("\x30\x26\xb2\x75\x8e\x66\xcf\x11\xa6\xd9\x00\xaa\x00\x62\xce\x6c"))
 }
+func SnifferAAC(header []byte) bool {
+	return bytes.HasPrefix(header, []byte{0xFF, 0xF1})
+}
+
+// SnifferDFF sniff a DSDIFF format
+// reference to: https://www.sonicstudio.com/pdf/dsd/DSDIFF_1.5_Spec.pdf
+func SnifferDFF(header []byte) bool {
+	return bytes.HasPrefix(header, []byte("FRM8"))
+}

algo/kgm/kgm.go

@@ -40,7 +40,7 @@ func (d Decoder) GetAudioData() []byte {
 }
 
 func (d Decoder) GetAudioExt() string {
-	return ""
+	return "" // use sniffer
 }
 
 func (d Decoder) GetMeta() common.Meta {
@@ -58,9 +58,8 @@ func (d *Decoder) Validate() error {
 
 	d.key = d.file[0x1c:0x2c]
 	d.key = append(d.key, 0x00)
-	_ = d.file[0x2c:0x3c] //key2
+	_ = d.file[0x2c:0x3c] //todo: key2
 	return nil
-
 }
 
 func (d *Decoder) Decode() error {
@@ -69,18 +68,15 @@ func (d *Decoder) Decode() error {
 	lenData := len(dataEncrypted)
 	initMask()
 	if fullMaskLen < lenData {
-		logging.Log().Warn("文件过大，处理后的音频不完整,请向我们报告此文件的信息")
+		logging.Log().Warn("The file is too large and the processed audio is incomplete, " +
+			"please report to us about this file at https://github.com/unlock-music/cli/issues")
 		lenData = fullMaskLen
 	}
 	d.audio = make([]byte, lenData)
 
 	for i := 0; i < lenData; i++ {
-		med8 := d.key[i%17] ^ dataEncrypted[i]
+		med8 := dataEncrypted[i] ^ d.key[i%17] ^ maskV2PreDef[i%(16*17)] ^ maskV2[i>>4]
-		med8 ^= (med8 & 0xf) << 4
+		d.audio[i] = med8 ^ (med8&0xf)<<4
-
-		msk8 := maskV2PreDef[i%272] ^ maskV2[i>>4]
-		msk8 ^= (msk8 & 0xf) << 4
-		d.audio[i] = med8 ^ msk8
 	}
 	if d.isVpr {
 		for i := 0; i < lenData; i++ {
@@ -91,8 +87,8 @@ func (d *Decoder) Decode() error {
 }
 func init() {
 	// Kugou
-	common.RegisterDecoder("kgm", NewDecoder)
+	common.RegisterDecoder("kgm", false, NewDecoder)
-	common.RegisterDecoder("kgma", NewDecoder)
+	common.RegisterDecoder("kgma", false, NewDecoder)
 	// Viper
-	common.RegisterDecoder("vpr", NewDecoder)
+	common.RegisterDecoder("vpr", false, NewDecoder)
 }

algo/kgm/mask.go

@@ -6,7 +6,7 @@ import (
 	"github.com/ulikunitz/xz"
 	"github.com/unlock-music/cli/internal/logging"
 	"go.uber.org/zap"
-	"io/ioutil"
+	"io"
 )
 
 var maskDiffVpr = []byte{
@@ -41,7 +41,7 @@ var maskV2 []byte
 var fullMaskLen int
 var initMaskOK = false
 
-//todo: 根据需求解压Mask大小
+//todo: decompress mask on demand
 func initMask() {
 	if initMaskOK {
 		return
@@ -50,7 +50,7 @@ func initMask() {
 	if err != nil {
 		logging.Log().Fatal("load kgm mask failed", zap.Error(err))
 	}
-	maskV2, err = ioutil.ReadAll(maskReader)
+	maskV2, err = io.ReadAll(maskReader)
 	if err != nil {
 		logging.Log().Fatal("load kgm mask failed", zap.Error(err))
 	}

algo/kwm/kwm.go

@@ -124,5 +124,6 @@ func padOrTruncate(raw string, length int) string {
 
 func init() {
 	// Kuwo Mp3/Flac
-	common.RegisterDecoder("kwm", NewDecoder)
+	common.RegisterDecoder("kwm", false, NewDecoder)
+	common.RegisterDecoder("kwm", false, common.NewRawDecoder)
 }

algo/ncm/ncm.go

@@ -61,7 +61,6 @@ func (d *Decoder) Validate() error {
 	return nil
 }
 
-//todo: 读取前进行检查长度，防止越界
 func (d *Decoder) readKeyData() error {
 	if d.offsetKey == 0 || d.offsetKey+4 > d.fileLen {
 		return errors.New("invalid cover file offset")
@@ -247,5 +246,5 @@ func (d Decoder) GetMeta() common.Meta {
 
 func init() {
 	// Netease Mp3/Flac
-	common.RegisterDecoder("ncm", NewDecoder)
+	common.RegisterDecoder("ncm", false, NewDecoder)
 }

algo/qmc/mask_key256.go

@@ -39,7 +39,7 @@ func NewKey256FromMask44(mask44 []byte) (*Key256Mask, error) {
 	return q, nil
 }
 
-func (q *Key256Mask) getMatrix44() (mask44 []byte, err error) {
+func (q *Key256Mask) GetMatrix44() ([]byte, error) {
 	if len(q.matrix) != 128 {
 		return nil, ErrMaskLength128
 	}
@@ -53,7 +53,7 @@ func (q *Key256Mask) getMatrix44() (mask44 []byte, err error) {
 					return nil, ErrMaskDecode
 				}
 			}
-			q.matrix[idx44] = q.matrix[it256[0]]
+			matrix44[idx44] = q.matrix[it256[0]]
 			idx44++
 		}
 	}

algo/qmc/qmc.go

@@ -102,27 +102,27 @@ func DecoderFuncWithExt(ext string) common.NewDecoderFunc {
 
 //goland:noinspection SpellCheckingInspection
 func init() {
-	common.RegisterDecoder("qmc0", DecoderFuncWithExt("mp3")) //QQ Music Mp3
+	common.RegisterDecoder("qmc0", false, DecoderFuncWithExt("mp3")) //QQ Music Mp3
-	common.RegisterDecoder("qmc3", DecoderFuncWithExt("mp3")) //QQ Music Mp3
+	common.RegisterDecoder("qmc3", false, DecoderFuncWithExt("mp3")) //QQ Music Mp3
 
-	common.RegisterDecoder("qmc2", DecoderFuncWithExt("m4a")) //QQ Music M4A
+	common.RegisterDecoder("qmc2", false, DecoderFuncWithExt("m4a")) //QQ Music M4A
-	common.RegisterDecoder("qmc4", DecoderFuncWithExt("m4a")) //QQ Music M4A
+	common.RegisterDecoder("qmc4", false, DecoderFuncWithExt("m4a")) //QQ Music M4A
-	common.RegisterDecoder("qmc6", DecoderFuncWithExt("m4a")) //QQ Music M4A
+	common.RegisterDecoder("qmc6", false, DecoderFuncWithExt("m4a")) //QQ Music M4A
-	common.RegisterDecoder("qmc8", DecoderFuncWithExt("m4a")) //QQ Music M4A
+	common.RegisterDecoder("qmc8", false, DecoderFuncWithExt("m4a")) //QQ Music M4A
 
-	common.RegisterDecoder("qmcflac", DecoderFuncWithExt("flac")) //QQ Music Flac
+	common.RegisterDecoder("qmcflac", false, DecoderFuncWithExt("flac")) //QQ Music Flac
-	common.RegisterDecoder("qmcogg", DecoderFuncWithExt("ogg"))   //QQ Music Ogg
+	common.RegisterDecoder("qmcogg", false, DecoderFuncWithExt("ogg"))   //QQ Music Ogg
-	common.RegisterDecoder("tkm", DecoderFuncWithExt("m4a"))      //QQ Music Accompaniment M4a
+	common.RegisterDecoder("tkm", false, DecoderFuncWithExt("m4a"))      //QQ Music Accompaniment M4a
 
-	common.RegisterDecoder("bkcmp3", DecoderFuncWithExt("mp3"))   //Moo Music Mp3
+	common.RegisterDecoder("bkcmp3", false, DecoderFuncWithExt("mp3"))   //Moo Music Mp3
-	common.RegisterDecoder("bkcflac", DecoderFuncWithExt("flac")) //Moo Music Flac
+	common.RegisterDecoder("bkcflac", false, DecoderFuncWithExt("flac")) //Moo Music Flac
 
-	common.RegisterDecoder("666c6163", DecoderFuncWithExt("flac")) //QQ Music Weiyun Flac
+	common.RegisterDecoder("666c6163", false, DecoderFuncWithExt("flac")) //QQ Music Weiyun Flac
-	common.RegisterDecoder("6d7033", DecoderFuncWithExt("mp3"))    //QQ Music Weiyun Mp3
+	common.RegisterDecoder("6d7033", false, DecoderFuncWithExt("mp3"))    //QQ Music Weiyun Mp3
-	common.RegisterDecoder("6f6767", DecoderFuncWithExt("ogg"))    //QQ Music Weiyun Ogg
+	common.RegisterDecoder("6f6767", false, DecoderFuncWithExt("ogg"))    //QQ Music Weiyun Ogg
-	common.RegisterDecoder("6d3461", DecoderFuncWithExt("m4a"))    //QQ Music Weiyun M4a
+	common.RegisterDecoder("6d3461", false, DecoderFuncWithExt("m4a"))    //QQ Music Weiyun M4a
-	common.RegisterDecoder("776176", DecoderFuncWithExt("wav"))    //QQ Music Weiyun Wav
+	common.RegisterDecoder("776176", false, DecoderFuncWithExt("wav"))    //QQ Music Weiyun Wav
 
-	common.RegisterDecoder("mgg", NewMgg256Decoder)     //QQ Music New Ogg
+	common.RegisterDecoder("mgg", false, NewMgg256Decoder)     //QQ Music New Ogg
-	common.RegisterDecoder("mflac", NewMflac256Decoder) //QQ Music New Flac
+	common.RegisterDecoder("mflac", false, NewMflac256Decoder) //QQ Music New Flac
 }

algo/tm/tm.go

@@ -70,10 +70,10 @@ func DecoderFuncWithExt(ext string) common.NewDecoderFunc {
 
 func init() {
 	// QQ Music IOS M4a
-	common.RegisterDecoder("tm2", DecoderFuncWithExt("m4a"))
+	common.RegisterDecoder("tm2", false, DecoderFuncWithExt("m4a"))
-	common.RegisterDecoder("tm6", DecoderFuncWithExt("m4a"))
+	common.RegisterDecoder("tm6", false, DecoderFuncWithExt("m4a"))
 	// QQ Music IOS Mp3
-	common.RegisterDecoder("tm0", common.DecoderFuncWithExt("mp3"))
+	common.RegisterDecoder("tm0", false, common.NewRawDecoder)
-	common.RegisterDecoder("tm3", common.DecoderFuncWithExt("mp3"))
+	common.RegisterDecoder("tm3", false, common.NewRawDecoder)
 
 }

algo/xm/xm.go

@@ -97,10 +97,10 @@ func DecoderFuncWithExt(ext string) common.NewDecoderFunc {
 
 func init() {
 	// Xiami Wav/M4a/Mp3/Flac
-	common.RegisterDecoder("xm", NewDecoder)
+	common.RegisterDecoder("xm", false, NewDecoder)
 	// Xiami Typed Format
-	common.RegisterDecoder("wav", DecoderFuncWithExt("wav"))
+	common.RegisterDecoder("wav", false, DecoderFuncWithExt("wav"))
-	common.RegisterDecoder("mp3", DecoderFuncWithExt("mp3"))
+	common.RegisterDecoder("mp3", false, DecoderFuncWithExt("mp3"))
-	common.RegisterDecoder("flac", DecoderFuncWithExt("flac"))
+	common.RegisterDecoder("flac", false, DecoderFuncWithExt("flac"))
-	common.RegisterDecoder("m4a", DecoderFuncWithExt("m4a"))
+	common.RegisterDecoder("m4a", false, DecoderFuncWithExt("m4a"))
 }

cmd/um/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"errors"
+	"fmt"
 	"github.com/unlock-music/cli/algo/common"
 	_ "github.com/unlock-music/cli/algo/kgm"
 	_ "github.com/unlock-music/cli/algo/kwm"
@@ -12,38 +13,67 @@ import (
 	"github.com/unlock-music/cli/internal/logging"
 	"github.com/urfave/cli/v2"
 	"go.uber.org/zap"
-	"log"
 	"os"
 	"path/filepath"
+	"runtime"
 	"strings"
 )
 
-var AppVersion = "0.0.3"
+var AppVersion = "v0.0.6"
 
 func main() {
 	app := cli.App{
 		Name:     "Unlock Music CLI",
 		HelpName: "um",
 		Usage:    "Unlock your encrypted music file https://github.com/unlock-music/cli",
-		Version:  AppVersion,
+		Version:  fmt.Sprintf("%s (%s,%s/%s)", AppVersion, runtime.Version(), runtime.GOOS, runtime.GOARCH),
 		Flags: []cli.Flag{
-			&cli.StringFlag{Name: "input", Aliases: []string{"i"}, Usage: "path to input file or dir", Required: true},
+			&cli.StringFlag{Name: "input", Aliases: []string{"i"}, Usage: "path to input file or dir", Required: false},
-			&cli.StringFlag{Name: "output", Aliases: []string{"o"}, Usage: "path to output dir", Required: true},
+			&cli.StringFlag{Name: "output", Aliases: []string{"o"}, Usage: "path to output dir", Required: false},
+			&cli.BoolFlag{Name: "skip-noop", Aliases: []string{"n"}, Usage: "skip noop decoder", Required: false, Value: true},
 		},
+
 		Action:          appMain,
-		Copyright:       "Copyright (c) 2020 Unlock Music https://github.com/unlock-music/cli/blob/master/LICENSE",
+		Copyright:       "Copyright (c) 2020 - 2021 Unlock Music https://github.com/unlock-music/cli/blob/master/LICENSE",
 		HideHelpCommand: true,
-		UsageText:       "um -i /path/to/input -o /path/to/output/dir",
+		UsageText:       "um [-o /path/to/output/dir] [--extra-flags] [-i] /path/to/input",
 	}
 	err := app.Run(os.Args)
 	if err != nil {
-		log.Fatal(err)
+		logging.Log().Fatal("run app failed", zap.Error(err))
 	}
 }
 
-func appMain(c *cli.Context) error {
+func appMain(c *cli.Context) (err error) {
 	input := c.String("input")
+	if input == "" {
+		switch c.Args().Len() {
+		case 0:
+			input, err = os.Getwd()
+			if err != nil {
+				return err
+			}
+		case 1:
+			input = c.Args().Get(0)
+		default:
+			return errors.New("please specify input file (or directory)")
+		}
+	}
+
 	output := c.String("output")
+	if output == "" {
+		var err error
+		output, err = os.Getwd()
+		if err != nil {
+			return err
+		}
+		if input == output {
+			return errors.New("input and output path are same")
+		}
+	}
+
+	skipNoop := c.Bool("skip-noop")
+
 	inputStat, err := os.Stat(input)
 	if err != nil {
 		return err
@@ -62,10 +92,9 @@ func appMain(c *cli.Context) error {
 	}
 
 	if inputStat.IsDir() {
-		return dealDirectory(input, output)
+		return dealDirectory(input, output, skipNoop)
 	} else {
-		ext := strings.TrimLeft(filepath.Ext(inputStat.Name()), ".")
+		allDec := common.GetDecoder(inputStat.Name(), skipNoop)
-		allDec := common.GetDecoder(ext)
 		if len(allDec) == 0 {
 			logging.Log().Fatal("skipping while no suitable decoder")
 		}
@@ -73,7 +102,7 @@ func appMain(c *cli.Context) error {
 	}
 
 }
-func dealDirectory(inputDir string, outputDir string) error {
+func dealDirectory(inputDir string, outputDir string, skipNoop bool) error {
 	items, err := os.ReadDir(inputDir)
 	if err != nil {
 		return err
@@ -82,8 +111,7 @@ func dealDirectory(inputDir string, outputDir string) error {
 		if item.IsDir() {
 			continue
 		}
-		ext := strings.TrimLeft(filepath.Ext(item.Name()), ".")
+		allDec := common.GetDecoder(item.Name(), skipNoop)
-		allDec := common.GetDecoder(ext)
 		if len(allDec) == 0 {
 			logging.Log().Info("skipping while no suitable decoder", zap.String("file", item.Name()))
 			continue

go.mod

@@ -1,12 +1,17 @@
 module github.com/unlock-music/cli
 
-go 1.16
+go 1.17
 
 require (
-	github.com/cpuguy83/go-md2man/v2 v2.0.0 // indirect
-	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/ulikunitz/xz v0.5.10
 	github.com/urfave/cli/v2 v2.3.0
-	go.uber.org/multierr v1.6.0 // indirect
+	go.uber.org/zap v1.19.1
-	go.uber.org/zap v1.16.0
+)
+
+require (
+	github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d // indirect
+	github.com/russross/blackfriday/v2 v2.0.1 // indirect
+	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
+	go.uber.org/atomic v1.7.0 // indirect
+	go.uber.org/multierr v1.6.0 // indirect
 )

go.sum

@@ -1,13 +1,11 @@
-github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8=
+github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
+github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
-github.com/cpuguy83/go-md2man/v2 v2.0.0 h1:EoUDS0afbrsXAZ9YQ9jdu/mZ2sXgT1/2yyNng4PGlyM=
-github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
-github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
@@ -15,51 +13,57 @@ github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
+github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
 github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
-github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
+github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
-github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
-github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
+github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
-github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
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 github.com/urfave/cli/v2 v2.3.0/go.mod h1:LJmUH05zAU44vOAcrfzZQKsZbVcdbOG8rtL3/XcUArI=
-go.uber.org/atomic v1.6.0/go.mod h1:sABNBOSYdrvTF6hTgEIbc7YasKWGhgEQZyfxyTvoXHQ=
+github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 go.uber.org/atomic v1.7.0 h1:ADUqmZGgLDDfbSL9ZmPxKTybcoEYHgpYfELNoN+7hsw=
 go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
-go.uber.org/multierr v1.5.0/go.mod h1:FeouvMocqHpRaaGuG9EjoKcStLC43Zu/fmqdUMPcKYU=
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 go.uber.org/multierr v1.6.0/go.mod h1:cdWPpRnG4AhwMwsgIHip0KRBQjJy5kYEpYjJxpXp9iU=
-go.uber.org/tools v0.0.0-20190618225709-2cfd321de3ee/go.mod h1:vJERXedbb3MVM5f9Ejo0C68/HhF8uaILCdgjnY+goOA=
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