From e6d67acfeb79ecf5f3ada216ed48bf5f4b503122 Mon Sep 17 00:00:00 2001
From: Hiroyuki Tanaka <h.tanaka.0325@gmail.com>
Date: Mon, 6 Jul 2020 22:11:53 +0900
Subject: [PATCH 1/9] Implements imgconv

---
 kadai1/tanaka0325/README.md               |  58 ++++++++++++
 kadai1/tanaka0325/converter/conv_image.go |  81 +++++++++++++++++
 kadai1/tanaka0325/converter/convert.go    | 104 ++++++++++++++++++++++
 kadai1/tanaka0325/converter/exts.go       |  14 +++
 kadai1/tanaka0325/go.mod                  |   5 ++
 kadai1/tanaka0325/go.sum                  |   4 +
 kadai1/tanaka0325/images/sample1.jpg      | Bin 0 -> 10979 bytes
 kadai1/tanaka0325/images2/img/sample3.jpg | Bin 0 -> 10979 bytes
 kadai1/tanaka0325/images2/sample2.jpg     | Bin 0 -> 10979 bytes
 kadai1/tanaka0325/imgconv.go              |   7 ++
 10 files changed, 273 insertions(+)
 create mode 100644 kadai1/tanaka0325/README.md
 create mode 100644 kadai1/tanaka0325/converter/conv_image.go
 create mode 100644 kadai1/tanaka0325/converter/convert.go
 create mode 100644 kadai1/tanaka0325/converter/exts.go
 create mode 100644 kadai1/tanaka0325/go.mod
 create mode 100644 kadai1/tanaka0325/go.sum
 create mode 100644 kadai1/tanaka0325/images/sample1.jpg
 create mode 100644 kadai1/tanaka0325/images2/img/sample3.jpg
 create mode 100644 kadai1/tanaka0325/images2/sample2.jpg
 create mode 100644 kadai1/tanaka0325/imgconv.go

diff --git a/kadai1/tanaka0325/README.md b/kadai1/tanaka0325/README.md
new file mode 100644
index 0000000..912ed3f
--- /dev/null
+++ b/kadai1/tanaka0325/README.md
@@ -0,0 +1,58 @@
+# Image Converter
+
+## Spec
+
+```
+## 次の仕様を満たすコマンドを作って下さい
+
+- ディレクトリを指定する
+- 指定したディレクトリ以下のJPGファイルをPNGに変換（デフォルト）
+- ディレクトリ以下は再帰的に処理する
+- 変換前と変換後の画像形式を指定できる（オプション）
+
+## 以下を満たすように開発してください
+
+- mainパッケージと分離する
+- 自作パッケージと標準パッケージと準標準パッケージのみ使う
+- 準標準パッケージ：golang.org/x以下のパッケージ
+- ユーザ定義型を作ってみる
+- GoDocを生成してみる
+- Go Modulesを使ってみる
+```
+
+## Usage
+
+```zsh
+# build
+$ go build -o ./imgconv
+
+# display help
+$ ./imgconv -h
+Usage of ./imgconv:
+  -f string
+        file extention before convert (default "jpg")
+  -n    dry run
+  -t string
+        file extention after convert (default "png")
+
+# single directory
+$ ./imgconv images
+
+# multi directories
+$ ./imgconv images images2
+
+# customize ext
+$ ./imgconv -f png -t gif images
+
+# dry run
+$ ./imgconv -n images
+images/sample1.jpg => images/sample1.png
+images2/img/sample3.jpg => images2/img/sample3.png
+images2/sample2.jpg => images2/sample2.png
+```
+
+## 感想
+
+- long option(?) はどうやってやれば良いのだろうか
+- そもそも作りとしてこれで良いのだろうか・・・めっちゃ悩みました
+
diff --git a/kadai1/tanaka0325/converter/conv_image.go b/kadai1/tanaka0325/converter/conv_image.go
new file mode 100644
index 0000000..2be5c9a
--- /dev/null
+++ b/kadai1/tanaka0325/converter/conv_image.go
@@ -0,0 +1,81 @@
+package converter
+
+import (
+	"fmt"
+	"image"
+	"image/gif"
+	"image/jpeg"
+	"image/png"
+	"io"
+	"os"
+
+	"golang.org/x/image/bmp"
+	"golang.org/x/image/tiff"
+)
+
+type convImage struct {
+	filename string
+	fromExt  string
+	toExt    string
+	image    image.Image
+}
+
+func (i *convImage) decode() error {
+	r, err := os.Open(i.filename + "." + i.fromExt)
+	if err != nil {
+		return err
+	}
+	defer r.Close()
+
+	img, err := decodeHelper(r, i.fromExt)
+	if err != nil {
+		return fmt.Errorf("decode error: %w", err)
+	}
+
+	i.image = img
+	return nil
+}
+
+func decodeHelper(r io.Reader, ext string) (image.Image, error) {
+	switch ext {
+	case "png":
+		return png.Decode(r)
+	case "jpg", "jpeg":
+		return jpeg.Decode(r)
+	case "gif":
+		return gif.Decode(r)
+	case "bmp":
+		return bmp.Decode(r)
+	case "tiff", "tif":
+		return tiff.Decode(r)
+	}
+	return nil, fmt.Errorf("%s is not allowed", ext)
+}
+
+func (i *convImage) encode() error {
+	w, err := os.Create(i.filename + "." + i.toExt)
+	if err != nil {
+		return err
+	}
+	defer func() error {
+		if err := w.Close(); err != nil {
+			return err
+		}
+		return nil
+	}()
+
+	switch i.toExt {
+	case "png":
+		return png.Encode(w, i.image)
+	case "jpg", "jpeg":
+		return jpeg.Encode(w, i.image, nil)
+	case "gif":
+		return gif.Encode(w, i.image, nil)
+	case "bmp":
+		return gif.Encode(w, i.image, nil)
+	case "tiff", "tif":
+		return gif.Encode(w, i.image, nil)
+	}
+
+	return fmt.Errorf("cannot encode image")
+}
diff --git a/kadai1/tanaka0325/converter/convert.go b/kadai1/tanaka0325/converter/convert.go
new file mode 100644
index 0000000..c5ee5c2
--- /dev/null
+++ b/kadai1/tanaka0325/converter/convert.go
@@ -0,0 +1,104 @@
+package converter
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+// flags
+var (
+	allowedExts = exts{"png", "jpg", "jpeg", "gif", "bmp", "tiff", "tif"}
+	f           = flag.String("f", "jpg", "file extention before convert")
+	t           = flag.String("t", "png", "file extention after convert")
+	dryRun      = flag.Bool("n", false, "dry run")
+)
+
+// Convert is to convert image file format
+func Convert() {
+	// check options ext
+	flag.Parse()
+	to := strings.ToLower(*t)
+	from := strings.ToLower(*f)
+	targetExts := []string{to, from}
+	for _, e := range targetExts {
+		if err := allowedExts.include(e); err != nil {
+			log.Fatal(fmt.Errorf("%w. ext is only allowd in %s", err, allowedExts))
+		}
+	}
+
+	// get target image paths from args
+	dns := flag.Args()
+	udns := uniq(dns)
+	paths, err := getPaths(udns, from)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// convert
+	imgs, err := createConvImages(paths, from, to)
+	if err != nil {
+		log.Fatal(err)
+	}
+	for _, img := range imgs {
+		if err := img.decode(); err != nil {
+			log.Fatal(err)
+		}
+
+		if *dryRun {
+			fmt.Println(img.filename+"."+img.fromExt, "=>", img.filename+"."+img.toExt)
+		} else {
+			if err := img.encode(); err != nil {
+				log.Fatal(err)
+			}
+		}
+	}
+}
+
+func uniq(s []string) []string {
+	m := map[string]bool{}
+	u := []string{}
+
+	for _, v := range s {
+		if !m[v] {
+			m[v] = true
+			u = append(u, v)
+		}
+	}
+
+	return u
+}
+
+func getPaths(dns []string, from string) ([]string, error) {
+	paths := []string{}
+
+	for _, dn := range dns {
+		if err := filepath.Walk(dn, func(path string, info os.FileInfo, err error) error {
+			if filepath.Ext(path) == "."+from {
+				paths = append(paths, path)
+			}
+			return nil
+		}); err != nil {
+			return nil, err
+		}
+	}
+
+	return paths, nil
+}
+
+func createConvImages(paths []string, from, to string) ([]convImage, error) {
+	images := []convImage{}
+	for _, p := range paths {
+		i := convImage{
+			filename: strings.Replace(p, "."+from, "", 1),
+			fromExt:  strings.ToLower(from),
+			toExt:    strings.ToLower(to),
+		}
+		images = append(images, i)
+	}
+
+	return images, nil
+}
diff --git a/kadai1/tanaka0325/converter/exts.go b/kadai1/tanaka0325/converter/exts.go
new file mode 100644
index 0000000..5343d8d
--- /dev/null
+++ b/kadai1/tanaka0325/converter/exts.go
@@ -0,0 +1,14 @@
+package converter
+
+import "errors"
+
+type exts []string
+
+func (es exts) include(w string) error {
+	for _, e := range es {
+		if e == w {
+			return nil
+		}
+	}
+	return errors.New(w + " is not allowed")
+}
diff --git a/kadai1/tanaka0325/go.mod b/kadai1/tanaka0325/go.mod
new file mode 100644
index 0000000..80a8fb1
--- /dev/null
+++ b/kadai1/tanaka0325/go.mod
@@ -0,0 +1,5 @@
+module github.com/gopherdojo/dojo8/kadai1/tanaka0325
+
+go 1.14
+
+require golang.org/x/image v0.0.0-20200618115811-c13761719519
diff --git a/kadai1/tanaka0325/go.sum b/kadai1/tanaka0325/go.sum
new file mode 100644
index 0000000..83da957
--- /dev/null
+++ b/kadai1/tanaka0325/go.sum
@@ -0,0 +1,4 @@
+github.com/gopherdojo/dojo8 v0.0.0-20200703052727-6a79d18126bf h1:lpYevjFQMxI5VNBc3WXV6Z5pDDrdppdDKwmeBoyt5BE=
+golang.org/x/image v0.0.0-20200618115811-c13761719519 h1:1e2ufUJNM3lCHEY5jIgac/7UTjd6cgJNdatjPdFWf34=
+golang.org/x/image v0.0.0-20200618115811-c13761719519/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
diff --git a/kadai1/tanaka0325/images/sample1.jpg b/kadai1/tanaka0325/images/sample1.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..7a1088190cee7554271ea0f297a9bbf8bd4ab023
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literal 0
HcmV?d00001

diff --git a/kadai1/tanaka0325/imgconv.go b/kadai1/tanaka0325/imgconv.go
new file mode 100644
index 0000000..badc036
--- /dev/null
+++ b/kadai1/tanaka0325/imgconv.go
@@ -0,0 +1,7 @@
+package main
+
+import "github.com/gopherdojo/dojo8/kadai1/tanaka0325/converter"
+
+func main() {
+	converter.Convert()
+}

From 5868629da1d545702c4d128bd85668dc1c56803c Mon Sep 17 00:00:00 2001
From: Hiroyuki Tanaka <h.tanaka.0325@gmail.com>
Date: Tue, 7 Jul 2020 01:39:13 +0900
Subject: [PATCH 2/9] Create testdata dir

---
 kadai1/tanaka0325/README.md                      |  15 ++++++++-------
 .../tanaka0325/{ => testdata}/images/sample1.jpg | Bin
 .../{ => testdata}/images2/img/sample3.jpg       | Bin
 .../{ => testdata}/images2/sample2.jpg           | Bin
 4 files changed, 8 insertions(+), 7 deletions(-)
 rename kadai1/tanaka0325/{ => testdata}/images/sample1.jpg (100%)
 rename kadai1/tanaka0325/{ => testdata}/images2/img/sample3.jpg (100%)
 rename kadai1/tanaka0325/{ => testdata}/images2/sample2.jpg (100%)

diff --git a/kadai1/tanaka0325/README.md b/kadai1/tanaka0325/README.md
index 912ed3f..dd5b852 100644
--- a/kadai1/tanaka0325/README.md
+++ b/kadai1/tanaka0325/README.md
@@ -36,19 +36,20 @@ Usage of ./imgconv:
         file extention after convert (default "png")
 
 # single directory
-$ ./imgconv images
+$ ./imgconv testdata/images
 
 # multi directories
-$ ./imgconv images images2
+$ ./imgconv testdata/images testdata/images2
 
 # customize ext
-$ ./imgconv -f png -t gif images
+$ ./imgconv -f png -t gif testdata/images
 
 # dry run
-$ ./imgconv -n images
-images/sample1.jpg => images/sample1.png
-images2/img/sample3.jpg => images2/img/sample3.png
-images2/sample2.jpg => images2/sample2.png
+$ ./imgconv -n testdata/images testdata/images2
+testdata/images/sample1.jpg => testdata/images/sample1.png
+testdata/images2/img/sample3.jpg => testdata/images2/img/sample3.png
+testdata/images2/sample2.jpg => testdata/images2/sample2.png
+
 ```
 
 ## 感想
diff --git a/kadai1/tanaka0325/images/sample1.jpg b/kadai1/tanaka0325/testdata/images/sample1.jpg
similarity index 100%
rename from kadai1/tanaka0325/images/sample1.jpg
rename to kadai1/tanaka0325/testdata/images/sample1.jpg
diff --git a/kadai1/tanaka0325/images2/img/sample3.jpg b/kadai1/tanaka0325/testdata/images2/img/sample3.jpg
similarity index 100%
rename from kadai1/tanaka0325/images2/img/sample3.jpg
rename to kadai1/tanaka0325/testdata/images2/img/sample3.jpg
diff --git a/kadai1/tanaka0325/images2/sample2.jpg b/kadai1/tanaka0325/testdata/images2/sample2.jpg
similarity index 100%
rename from kadai1/tanaka0325/images2/sample2.jpg
rename to kadai1/tanaka0325/testdata/images2/sample2.jpg

From 51e8c55a01b2e5be8150caa90d0a70c4be5102ec Mon Sep 17 00:00:00 2001
From: Hiroyuki Tanaka <h.tanaka.0325@gmail.com>
Date: Wed, 15 Jul 2020 23:05:54 +0900
Subject: [PATCH 3/9] change structure

---
 kadai1/tanaka0325/README.md                   |   2 +-
 kadai1/tanaka0325/imgconv.go                  |   7 ------
 kadai1/tanaka0325/imgconv/cmd/imgconv/main.go |   9 ++++++++
 .../{converter => imgconv}/conv_image.go      |   2 +-
 .../tanaka0325/{converter => imgconv}/exts.go |   2 +-
 kadai1/tanaka0325/{ => imgconv}/go.mod        |   2 +-
 kadai1/tanaka0325/{ => imgconv}/go.sum        |   0
 .../convert.go => imgconv/imgconv.go}         |  21 +++++++++++-------
 .../{ => imgconv}/testdata/images/sample1.jpg | Bin
 .../testdata/images2/img/sample3.jpg          | Bin
 .../testdata/images2/sample2.jpg              | Bin
 11 files changed, 26 insertions(+), 19 deletions(-)
 delete mode 100644 kadai1/tanaka0325/imgconv.go
 create mode 100644 kadai1/tanaka0325/imgconv/cmd/imgconv/main.go
 rename kadai1/tanaka0325/{converter => imgconv}/conv_image.go (98%)
 rename kadai1/tanaka0325/{converter => imgconv}/exts.go (91%)
 rename kadai1/tanaka0325/{ => imgconv}/go.mod (54%)
 rename kadai1/tanaka0325/{ => imgconv}/go.sum (100%)
 rename kadai1/tanaka0325/{converter/convert.go => imgconv/imgconv.go} (86%)
 rename kadai1/tanaka0325/{ => imgconv}/testdata/images/sample1.jpg (100%)
 rename kadai1/tanaka0325/{ => imgconv}/testdata/images2/img/sample3.jpg (100%)
 rename kadai1/tanaka0325/{ => imgconv}/testdata/images2/sample2.jpg (100%)

diff --git a/kadai1/tanaka0325/README.md b/kadai1/tanaka0325/README.md
index dd5b852..e239401 100644
--- a/kadai1/tanaka0325/README.md
+++ b/kadai1/tanaka0325/README.md
@@ -24,7 +24,7 @@
 
 ```zsh
 # build
-$ go build -o ./imgconv
+$ go build -o imgconv ./cmd/imgconv
 
 # display help
 $ ./imgconv -h
diff --git a/kadai1/tanaka0325/imgconv.go b/kadai1/tanaka0325/imgconv.go
deleted file mode 100644
index badc036..0000000
--- a/kadai1/tanaka0325/imgconv.go
+++ /dev/null
@@ -1,7 +0,0 @@
-package main
-
-import "github.com/gopherdojo/dojo8/kadai1/tanaka0325/converter"
-
-func main() {
-	converter.Convert()
-}
diff --git a/kadai1/tanaka0325/imgconv/cmd/imgconv/main.go b/kadai1/tanaka0325/imgconv/cmd/imgconv/main.go
new file mode 100644
index 0000000..344f749
--- /dev/null
+++ b/kadai1/tanaka0325/imgconv/cmd/imgconv/main.go
@@ -0,0 +1,9 @@
+package main
+
+import (
+	"github.com/gopherdojo/dojo8/kadai1/tanaka0325/imgconv"
+)
+
+func main() {
+	imgconv.Run()
+}
diff --git a/kadai1/tanaka0325/converter/conv_image.go b/kadai1/tanaka0325/imgconv/conv_image.go
similarity index 98%
rename from kadai1/tanaka0325/converter/conv_image.go
rename to kadai1/tanaka0325/imgconv/conv_image.go
index 2be5c9a..7a873e5 100644
--- a/kadai1/tanaka0325/converter/conv_image.go
+++ b/kadai1/tanaka0325/imgconv/conv_image.go
@@ -1,4 +1,4 @@
-package converter
+package imgconv
 
 import (
 	"fmt"
diff --git a/kadai1/tanaka0325/converter/exts.go b/kadai1/tanaka0325/imgconv/exts.go
similarity index 91%
rename from kadai1/tanaka0325/converter/exts.go
rename to kadai1/tanaka0325/imgconv/exts.go
index 5343d8d..ab81016 100644
--- a/kadai1/tanaka0325/converter/exts.go
+++ b/kadai1/tanaka0325/imgconv/exts.go
@@ -1,4 +1,4 @@
-package converter
+package imgconv
 
 import "errors"
 
diff --git a/kadai1/tanaka0325/go.mod b/kadai1/tanaka0325/imgconv/go.mod
similarity index 54%
rename from kadai1/tanaka0325/go.mod
rename to kadai1/tanaka0325/imgconv/go.mod
index 80a8fb1..ad64074 100644
--- a/kadai1/tanaka0325/go.mod
+++ b/kadai1/tanaka0325/imgconv/go.mod
@@ -1,4 +1,4 @@
-module github.com/gopherdojo/dojo8/kadai1/tanaka0325
+module github.com/gopherdojo/dojo8/kadai1/tanaka0325/imgconv
 
 go 1.14
 
diff --git a/kadai1/tanaka0325/go.sum b/kadai1/tanaka0325/imgconv/go.sum
similarity index 100%
rename from kadai1/tanaka0325/go.sum
rename to kadai1/tanaka0325/imgconv/go.sum
diff --git a/kadai1/tanaka0325/converter/convert.go b/kadai1/tanaka0325/imgconv/imgconv.go
similarity index 86%
rename from kadai1/tanaka0325/converter/convert.go
rename to kadai1/tanaka0325/imgconv/imgconv.go
index c5ee5c2..2edc0d1 100644
--- a/kadai1/tanaka0325/converter/convert.go
+++ b/kadai1/tanaka0325/imgconv/imgconv.go
@@ -1,4 +1,4 @@
-package converter
+package imgconv
 
 import (
 	"flag"
@@ -9,18 +9,23 @@ import (
 	"strings"
 )
 
-// flags
 var (
+	// flags
+	f      = flag.String("f", "jpg", "file extention before convert")
+	t      = flag.String("t", "png", "file extention after convert")
+	dryRun = flag.Bool("n", false, "dry run")
+
+	// allow extensions
 	allowedExts = exts{"png", "jpg", "jpeg", "gif", "bmp", "tiff", "tif"}
-	f           = flag.String("f", "jpg", "file extention before convert")
-	t           = flag.String("t", "png", "file extention after convert")
-	dryRun      = flag.Bool("n", false, "dry run")
 )
 
-// Convert is to convert image file format
-func Convert() {
-	// check options ext
+func init() {
 	flag.Parse()
+}
+
+// Run is to convert image file format
+func Run() {
+	// check options ext
 	to := strings.ToLower(*t)
 	from := strings.ToLower(*f)
 	targetExts := []string{to, from}
diff --git a/kadai1/tanaka0325/testdata/images/sample1.jpg b/kadai1/tanaka0325/imgconv/testdata/images/sample1.jpg
similarity index 100%
rename from kadai1/tanaka0325/testdata/images/sample1.jpg
rename to kadai1/tanaka0325/imgconv/testdata/images/sample1.jpg
diff --git a/kadai1/tanaka0325/testdata/images2/img/sample3.jpg b/kadai1/tanaka0325/imgconv/testdata/images2/img/sample3.jpg
similarity index 100%
rename from kadai1/tanaka0325/testdata/images2/img/sample3.jpg
rename to kadai1/tanaka0325/imgconv/testdata/images2/img/sample3.jpg
diff --git a/kadai1/tanaka0325/testdata/images2/sample2.jpg b/kadai1/tanaka0325/imgconv/testdata/images2/sample2.jpg
similarity index 100%
rename from kadai1/tanaka0325/testdata/images2/sample2.jpg
rename to kadai1/tanaka0325/imgconv/testdata/images2/sample2.jpg

From 6c9f2bb5307f7b7424f6bef96f2bd0108c122b9c Mon Sep 17 00:00:00 2001
From: Hiroyuki Tanaka <h.tanaka.0325@gmail.com>
Date: Wed, 15 Jul 2020 23:34:19 +0900
Subject: [PATCH 4/9] error handling

---
 kadai1/tanaka0325/imgconv/cmd/imgconv/main.go | 10 +++++++++-
 kadai1/tanaka0325/imgconv/imgconv.go          | 15 ++++++++-------
 2 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/kadai1/tanaka0325/imgconv/cmd/imgconv/main.go b/kadai1/tanaka0325/imgconv/cmd/imgconv/main.go
index 344f749..95155e0 100644
--- a/kadai1/tanaka0325/imgconv/cmd/imgconv/main.go
+++ b/kadai1/tanaka0325/imgconv/cmd/imgconv/main.go
@@ -1,9 +1,17 @@
 package main
 
 import (
+	"fmt"
+	"os"
+
 	"github.com/gopherdojo/dojo8/kadai1/tanaka0325/imgconv"
 )
 
 func main() {
-	imgconv.Run()
+	if err := imgconv.Run(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+
+	os.Exit(0)
 }
diff --git a/kadai1/tanaka0325/imgconv/imgconv.go b/kadai1/tanaka0325/imgconv/imgconv.go
index 2edc0d1..28410ad 100644
--- a/kadai1/tanaka0325/imgconv/imgconv.go
+++ b/kadai1/tanaka0325/imgconv/imgconv.go
@@ -3,7 +3,6 @@ package imgconv
 import (
 	"flag"
 	"fmt"
-	"log"
 	"os"
 	"path/filepath"
 	"strings"
@@ -24,14 +23,14 @@ func init() {
 }
 
 // Run is to convert image file format
-func Run() {
+func Run() error {
 	// check options ext
 	to := strings.ToLower(*t)
 	from := strings.ToLower(*f)
 	targetExts := []string{to, from}
 	for _, e := range targetExts {
 		if err := allowedExts.include(e); err != nil {
-			log.Fatal(fmt.Errorf("%w. ext is only allowd in %s", err, allowedExts))
+			return fmt.Errorf("%w. ext is only allowd in %s", err, allowedExts)
 		}
 	}
 
@@ -40,27 +39,29 @@ func Run() {
 	udns := uniq(dns)
 	paths, err := getPaths(udns, from)
 	if err != nil {
-		log.Fatal(err)
+		return err
 	}
 
 	// convert
 	imgs, err := createConvImages(paths, from, to)
 	if err != nil {
-		log.Fatal(err)
+		return err
 	}
 	for _, img := range imgs {
 		if err := img.decode(); err != nil {
-			log.Fatal(err)
+			return err
 		}
 
 		if *dryRun {
 			fmt.Println(img.filename+"."+img.fromExt, "=>", img.filename+"."+img.toExt)
 		} else {
 			if err := img.encode(); err != nil {
-				log.Fatal(err)
+				return err
 			}
 		}
 	}
+
+	return nil
 }
 
 func uniq(s []string) []string {

From d5664c88b021cfea3f74bdfeae3b6b2c9aab02d8 Mon Sep 17 00:00:00 2001
From: Hiroyuki Tanaka <h.tanaka.0325@gmail.com>
Date: Thu, 16 Jul 2020 15:55:58 +0900
Subject: [PATCH 5/9] =?UTF-8?q?=E3=82=AA=E3=83=97=E3=82=B7=E3=83=A7?=
 =?UTF-8?q?=E3=83=B3=E3=80=81=E5=BC=95=E6=95=B0=E3=81=AE=E5=9F=BA=E6=9C=AC?=
 =?UTF-8?q?=E7=9A=84=E3=81=AA=E5=87=A6=E7=90=86=E3=81=AE=E5=A0=B4=E6=89=80?=
 =?UTF-8?q?=E3=82=92=E7=A7=BB=E5=8B=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 kadai1/tanaka0325/README.md                   |  1 +
 kadai1/tanaka0325/imgconv/args.go             | 17 +++++++
 kadai1/tanaka0325/imgconv/cmd/imgconv/main.go | 15 +++++-
 kadai1/tanaka0325/imgconv/exts.go             | 14 -----
 kadai1/tanaka0325/imgconv/go.mod.back         |  5 ++
 kadai1/tanaka0325/imgconv/go.sum              |  1 -
 kadai1/tanaka0325/imgconv/imgconv.go          | 51 ++++---------------
 kadai1/tanaka0325/imgconv/options.go          | 35 +++++++++++++
 8 files changed, 81 insertions(+), 58 deletions(-)
 create mode 100644 kadai1/tanaka0325/imgconv/args.go
 delete mode 100644 kadai1/tanaka0325/imgconv/exts.go
 create mode 100644 kadai1/tanaka0325/imgconv/go.mod.back
 create mode 100644 kadai1/tanaka0325/imgconv/options.go

diff --git a/kadai1/tanaka0325/README.md b/kadai1/tanaka0325/README.md
index e239401..c04f8c5 100644
--- a/kadai1/tanaka0325/README.md
+++ b/kadai1/tanaka0325/README.md
@@ -24,6 +24,7 @@
 
 ```zsh
 # build
+$ cd imgconv
 $ go build -o imgconv ./cmd/imgconv
 
 # display help
diff --git a/kadai1/tanaka0325/imgconv/args.go b/kadai1/tanaka0325/imgconv/args.go
new file mode 100644
index 0000000..5bb286f
--- /dev/null
+++ b/kadai1/tanaka0325/imgconv/args.go
@@ -0,0 +1,17 @@
+package imgconv
+
+type Args []string
+
+func (args Args) uniq() []string {
+	m := map[string]bool{}
+	u := []string{}
+
+	for _, v := range args {
+		if !m[v] {
+			m[v] = true
+			u = append(u, v)
+		}
+	}
+
+	return u
+}
diff --git a/kadai1/tanaka0325/imgconv/cmd/imgconv/main.go b/kadai1/tanaka0325/imgconv/cmd/imgconv/main.go
index 95155e0..10a5a56 100644
--- a/kadai1/tanaka0325/imgconv/cmd/imgconv/main.go
+++ b/kadai1/tanaka0325/imgconv/cmd/imgconv/main.go
@@ -1,14 +1,27 @@
 package main
 
 import (
+	"flag"
 	"fmt"
 	"os"
 
 	"github.com/gopherdojo/dojo8/kadai1/tanaka0325/imgconv"
 )
 
+var options imgconv.Options
+var args imgconv.Args
+
+func init() {
+	options.From = flag.String("f", "jpg", "file extention before convert")
+	options.To = flag.String("t", "png", "file extention after convert")
+	options.DryRun = flag.Bool("n", false, "dry run")
+	flag.Parse()
+
+	args = flag.Args()
+}
+
 func main() {
-	if err := imgconv.Run(); err != nil {
+	if err := imgconv.Run(options, args); err != nil {
 		fmt.Fprintln(os.Stderr, err)
 		os.Exit(1)
 	}
diff --git a/kadai1/tanaka0325/imgconv/exts.go b/kadai1/tanaka0325/imgconv/exts.go
deleted file mode 100644
index ab81016..0000000
--- a/kadai1/tanaka0325/imgconv/exts.go
+++ /dev/null
@@ -1,14 +0,0 @@
-package imgconv
-
-import "errors"
-
-type exts []string
-
-func (es exts) include(w string) error {
-	for _, e := range es {
-		if e == w {
-			return nil
-		}
-	}
-	return errors.New(w + " is not allowed")
-}
diff --git a/kadai1/tanaka0325/imgconv/go.mod.back b/kadai1/tanaka0325/imgconv/go.mod.back
new file mode 100644
index 0000000..ad64074
--- /dev/null
+++ b/kadai1/tanaka0325/imgconv/go.mod.back
@@ -0,0 +1,5 @@
+module github.com/gopherdojo/dojo8/kadai1/tanaka0325/imgconv
+
+go 1.14
+
+require golang.org/x/image v0.0.0-20200618115811-c13761719519
diff --git a/kadai1/tanaka0325/imgconv/go.sum b/kadai1/tanaka0325/imgconv/go.sum
index 83da957..394251b 100644
--- a/kadai1/tanaka0325/imgconv/go.sum
+++ b/kadai1/tanaka0325/imgconv/go.sum
@@ -1,4 +1,3 @@
-github.com/gopherdojo/dojo8 v0.0.0-20200703052727-6a79d18126bf h1:lpYevjFQMxI5VNBc3WXV6Z5pDDrdppdDKwmeBoyt5BE=
 golang.org/x/image v0.0.0-20200618115811-c13761719519 h1:1e2ufUJNM3lCHEY5jIgac/7UTjd6cgJNdatjPdFWf34=
 golang.org/x/image v0.0.0-20200618115811-c13761719519/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
diff --git a/kadai1/tanaka0325/imgconv/imgconv.go b/kadai1/tanaka0325/imgconv/imgconv.go
index 28410ad..be2338d 100644
--- a/kadai1/tanaka0325/imgconv/imgconv.go
+++ b/kadai1/tanaka0325/imgconv/imgconv.go
@@ -1,49 +1,30 @@
 package imgconv
 
 import (
-	"flag"
 	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
 )
 
-var (
-	// flags
-	f      = flag.String("f", "jpg", "file extention before convert")
-	t      = flag.String("t", "png", "file extention after convert")
-	dryRun = flag.Bool("n", false, "dry run")
-
-	// allow extensions
-	allowedExts = exts{"png", "jpg", "jpeg", "gif", "bmp", "tiff", "tif"}
-)
-
-func init() {
-	flag.Parse()
-}
+var allowedExts = []string{"png", "jpg", "jpeg", "gif", "bmp", "tiff", "tif"}
 
 // Run is to convert image file format
-func Run() error {
-	// check options ext
-	to := strings.ToLower(*t)
-	from := strings.ToLower(*f)
-	targetExts := []string{to, from}
-	for _, e := range targetExts {
-		if err := allowedExts.include(e); err != nil {
-			return fmt.Errorf("%w. ext is only allowd in %s", err, allowedExts)
-		}
+func Run(options Options, args Args) error {
+	// validator
+	if err := options.validate(allowedExts); err != nil {
+		return err
 	}
 
 	// get target image paths from args
-	dns := flag.Args()
-	udns := uniq(dns)
-	paths, err := getPaths(udns, from)
+	udns := args.uniq()
+	paths, err := getPaths(udns, *options.From)
 	if err != nil {
 		return err
 	}
 
 	// convert
-	imgs, err := createConvImages(paths, from, to)
+	imgs, err := createConvImages(paths, *options.From, *options.To)
 	if err != nil {
 		return err
 	}
@@ -52,7 +33,7 @@ func Run() error {
 			return err
 		}
 
-		if *dryRun {
+		if *options.DryRun {
 			fmt.Println(img.filename+"."+img.fromExt, "=>", img.filename+"."+img.toExt)
 		} else {
 			if err := img.encode(); err != nil {
@@ -64,20 +45,6 @@ func Run() error {
 	return nil
 }
 
-func uniq(s []string) []string {
-	m := map[string]bool{}
-	u := []string{}
-
-	for _, v := range s {
-		if !m[v] {
-			m[v] = true
-			u = append(u, v)
-		}
-	}
-
-	return u
-}
-
 func getPaths(dns []string, from string) ([]string, error) {
 	paths := []string{}
 
diff --git a/kadai1/tanaka0325/imgconv/options.go b/kadai1/tanaka0325/imgconv/options.go
new file mode 100644
index 0000000..99accea
--- /dev/null
+++ b/kadai1/tanaka0325/imgconv/options.go
@@ -0,0 +1,35 @@
+package imgconv
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+)
+
+type Options struct {
+	From   *string
+	To     *string
+	DryRun *bool
+}
+
+func (opt Options) validate(allow_list []string) error {
+	to := strings.ToLower(*opt.To)
+	from := strings.ToLower(*opt.From)
+	targetExts := []string{to, from}
+	for _, e := range targetExts {
+		if err := include(allow_list, e); err != nil {
+			return fmt.Errorf("%w. ext is only allowd in %s", err, allow_list)
+		}
+	}
+
+	return nil
+}
+
+func include(list []string, w string) error {
+	for _, e := range list {
+		if e == w {
+			return nil
+		}
+	}
+	return errors.New(w + " is not allowed")
+}

From bcdcd95b03b69bdf373b8273058adec11e7876af Mon Sep 17 00:00:00 2001
From: Hiroyuki Tanaka <h.tanaka.0325@gmail.com>
Date: Fri, 17 Jul 2020 11:41:46 +0900
Subject: [PATCH 6/9] refactoring 1

---
 kadai1/tanaka0325/imgconv/imgconv.go | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/kadai1/tanaka0325/imgconv/imgconv.go b/kadai1/tanaka0325/imgconv/imgconv.go
index be2338d..e201b92 100644
--- a/kadai1/tanaka0325/imgconv/imgconv.go
+++ b/kadai1/tanaka0325/imgconv/imgconv.go
@@ -16,9 +16,8 @@ func Run(options Options, args Args) error {
 		return err
 	}
 
-	// get target image paths from args
-	udns := args.uniq()
-	paths, err := getPaths(udns, *options.From)
+	// get target image flepaths from args
+	paths, err := getTargetFilePaths(args, *options.From)
 	if err != nil {
 		return err
 	}
@@ -45,11 +44,12 @@ func Run(options Options, args Args) error {
 	return nil
 }
 
-func getPaths(dns []string, from string) ([]string, error) {
+func getTargetFilePaths(args Args, from string) ([]string, error) {
+	uns := args.uniq()
 	paths := []string{}
 
-	for _, dn := range dns {
-		if err := filepath.Walk(dn, func(path string, info os.FileInfo, err error) error {
+	for _, n := range uns {
+		if err := filepath.Walk(n, func(path string, info os.FileInfo, err error) error {
 			if filepath.Ext(path) == "."+from {
 				paths = append(paths, path)
 			}

From a265027b090933f341e5b57875b7c91978a94f84 Mon Sep 17 00:00:00 2001
From: Hiroyuki Tanaka <h.tanaka.0325@gmail.com>
Date: Fri, 17 Jul 2020 11:58:37 +0900
Subject: [PATCH 7/9] Add comments

---
 kadai1/tanaka0325/imgconv/args.go       | 1 +
 kadai1/tanaka0325/imgconv/conv_image.go | 1 +
 kadai1/tanaka0325/imgconv/imgconv.go    | 1 +
 kadai1/tanaka0325/imgconv/options.go    | 1 +
 4 files changed, 4 insertions(+)

diff --git a/kadai1/tanaka0325/imgconv/args.go b/kadai1/tanaka0325/imgconv/args.go
index 5bb286f..c5cd6f6 100644
--- a/kadai1/tanaka0325/imgconv/args.go
+++ b/kadai1/tanaka0325/imgconv/args.go
@@ -1,5 +1,6 @@
 package imgconv
 
+// Args is type for command line arguments.
 type Args []string
 
 func (args Args) uniq() []string {
diff --git a/kadai1/tanaka0325/imgconv/conv_image.go b/kadai1/tanaka0325/imgconv/conv_image.go
index 7a873e5..cb92ef3 100644
--- a/kadai1/tanaka0325/imgconv/conv_image.go
+++ b/kadai1/tanaka0325/imgconv/conv_image.go
@@ -13,6 +13,7 @@ import (
 	"golang.org/x/image/tiff"
 )
 
+// convImage is type included infomation to convert file format.
 type convImage struct {
 	filename string
 	fromExt  string
diff --git a/kadai1/tanaka0325/imgconv/imgconv.go b/kadai1/tanaka0325/imgconv/imgconv.go
index e201b92..29db8da 100644
--- a/kadai1/tanaka0325/imgconv/imgconv.go
+++ b/kadai1/tanaka0325/imgconv/imgconv.go
@@ -1,3 +1,4 @@
+// Imgconv package is to convert images file format.
 package imgconv
 
 import (
diff --git a/kadai1/tanaka0325/imgconv/options.go b/kadai1/tanaka0325/imgconv/options.go
index 99accea..3a31e15 100644
--- a/kadai1/tanaka0325/imgconv/options.go
+++ b/kadai1/tanaka0325/imgconv/options.go
@@ -6,6 +6,7 @@ import (
 	"strings"
 )
 
+// Args is type for command line options.
 type Options struct {
 	From   *string
 	To     *string

From a235d16896efedd9f69e4dd79f7e8fcdc62ad2c4 Mon Sep 17 00:00:00 2001
From: Hiroyuki Tanaka <h.tanaka.0325@gmail.com>
Date: Fri, 17 Jul 2020 23:18:43 +0900
Subject: [PATCH 8/9] refactoring

---
 kadai1/tanaka0325/imgconv/args.go             |  1 +
 kadai1/tanaka0325/imgconv/cmd/imgconv/main.go |  4 +-
 kadai1/tanaka0325/imgconv/cnv_image.go        | 81 ++++++++++++++++
 kadai1/tanaka0325/imgconv/conv_image.go       | 82 -----------------
 kadai1/tanaka0325/imgconv/go.mod.back         |  5 -
 kadai1/tanaka0325/imgconv/imgconv.go          | 92 +++++++++++++------
 kadai1/tanaka0325/imgconv/options.go          |  7 +-
 7 files changed, 153 insertions(+), 119 deletions(-)
 create mode 100644 kadai1/tanaka0325/imgconv/cnv_image.go
 delete mode 100644 kadai1/tanaka0325/imgconv/conv_image.go
 delete mode 100644 kadai1/tanaka0325/imgconv/go.mod.back

diff --git a/kadai1/tanaka0325/imgconv/args.go b/kadai1/tanaka0325/imgconv/args.go
index c5cd6f6..4212901 100644
--- a/kadai1/tanaka0325/imgconv/args.go
+++ b/kadai1/tanaka0325/imgconv/args.go
@@ -10,6 +10,7 @@ func (args Args) uniq() []string {
 	for _, v := range args {
 		if !m[v] {
 			m[v] = true
+
 			u = append(u, v)
 		}
 	}
diff --git a/kadai1/tanaka0325/imgconv/cmd/imgconv/main.go b/kadai1/tanaka0325/imgconv/cmd/imgconv/main.go
index 10a5a56..875aefa 100644
--- a/kadai1/tanaka0325/imgconv/cmd/imgconv/main.go
+++ b/kadai1/tanaka0325/imgconv/cmd/imgconv/main.go
@@ -12,8 +12,8 @@ var options imgconv.Options
 var args imgconv.Args
 
 func init() {
-	options.From = flag.String("f", "jpg", "file extention before convert")
-	options.To = flag.String("t", "png", "file extention after convert")
+	options.From = flag.String("f", "jpg", "file extension before convert")
+	options.To = flag.String("t", "png", "file extension after convert")
 	options.DryRun = flag.Bool("n", false, "dry run")
 	flag.Parse()
 
diff --git a/kadai1/tanaka0325/imgconv/cnv_image.go b/kadai1/tanaka0325/imgconv/cnv_image.go
new file mode 100644
index 0000000..869a7d9
--- /dev/null
+++ b/kadai1/tanaka0325/imgconv/cnv_image.go
@@ -0,0 +1,81 @@
+package imgconv
+
+import (
+	"image"
+	"image/gif"
+	"image/jpeg"
+	"image/png"
+	"io"
+
+	"golang.org/x/image/bmp"
+	"golang.org/x/image/tiff"
+)
+
+type Decoder interface {
+	Decode(io.Reader) (image.Image, error)
+}
+
+type Encoder interface {
+	Encode(io.Writer, image.Image) error
+}
+
+type DecodeEncoder interface {
+	Decoder
+	Encoder
+}
+
+type CnvImage struct{}
+
+// CnvImagePng is type for png format.
+type CnvImagePNG CnvImage
+
+func (ip CnvImagePNG) Decode(r io.Reader) (image.Image, error) { return png.Decode(r) }
+
+func (ip CnvImagePNG) Encode(w io.Writer, i image.Image) error { return png.Encode(w, i) }
+
+// CnvImageJPEG is type for jpeg format.
+type CnvImageJPEG CnvImage
+
+func (ip CnvImageJPEG) Decode(r io.Reader) (image.Image, error) { return jpeg.Decode(r) }
+
+func (ip CnvImageJPEG) Encode(w io.Writer, i image.Image) error { return jpeg.Encode(w, i, nil) }
+
+// CnvImageGIF is type for gif format.
+type CnvImageGIF CnvImage
+
+func (ip CnvImageGIF) Decode(r io.Reader) (image.Image, error) { return gif.Decode(r) }
+
+func (ip CnvImageGIF) Encode(w io.Writer, i image.Image) error {
+	return gif.Encode(w, i, &gif.Options{NumColors: 256})
+}
+
+// CnvImageBMP is type for bmp format.
+type CnvImageBMP CnvImage
+
+func (ip CnvImageBMP) Decode(r io.Reader) (image.Image, error) { return bmp.Decode(r) }
+
+func (ip CnvImageBMP) Encode(w io.Writer, i image.Image) error { return bmp.Encode(w, i) }
+
+// CnvImageTIFF is type for tiff format.
+type CnvImageTIFF CnvImage
+
+func (ip CnvImageTIFF) Decode(r io.Reader) (image.Image, error) { return tiff.Decode(r) }
+
+func (ip CnvImageTIFF) Encode(w io.Writer, i image.Image) error { return tiff.Encode(w, i, nil) }
+
+func newCnvImage(ext string) DecodeEncoder {
+	switch ext {
+	case "png":
+		return &CnvImagePNG{}
+	case "jpg", "jpeg":
+		return &CnvImageJPEG{}
+	case "gif":
+		return &CnvImageGIF{}
+	case "bmp":
+		return &CnvImageBMP{}
+	case "tiff", "tif":
+		return &CnvImageTIFF{}
+	}
+
+	return nil
+}
diff --git a/kadai1/tanaka0325/imgconv/conv_image.go b/kadai1/tanaka0325/imgconv/conv_image.go
deleted file mode 100644
index cb92ef3..0000000
--- a/kadai1/tanaka0325/imgconv/conv_image.go
+++ /dev/null
@@ -1,82 +0,0 @@
-package imgconv
-
-import (
-	"fmt"
-	"image"
-	"image/gif"
-	"image/jpeg"
-	"image/png"
-	"io"
-	"os"
-
-	"golang.org/x/image/bmp"
-	"golang.org/x/image/tiff"
-)
-
-// convImage is type included infomation to convert file format.
-type convImage struct {
-	filename string
-	fromExt  string
-	toExt    string
-	image    image.Image
-}
-
-func (i *convImage) decode() error {
-	r, err := os.Open(i.filename + "." + i.fromExt)
-	if err != nil {
-		return err
-	}
-	defer r.Close()
-
-	img, err := decodeHelper(r, i.fromExt)
-	if err != nil {
-		return fmt.Errorf("decode error: %w", err)
-	}
-
-	i.image = img
-	return nil
-}
-
-func decodeHelper(r io.Reader, ext string) (image.Image, error) {
-	switch ext {
-	case "png":
-		return png.Decode(r)
-	case "jpg", "jpeg":
-		return jpeg.Decode(r)
-	case "gif":
-		return gif.Decode(r)
-	case "bmp":
-		return bmp.Decode(r)
-	case "tiff", "tif":
-		return tiff.Decode(r)
-	}
-	return nil, fmt.Errorf("%s is not allowed", ext)
-}
-
-func (i *convImage) encode() error {
-	w, err := os.Create(i.filename + "." + i.toExt)
-	if err != nil {
-		return err
-	}
-	defer func() error {
-		if err := w.Close(); err != nil {
-			return err
-		}
-		return nil
-	}()
-
-	switch i.toExt {
-	case "png":
-		return png.Encode(w, i.image)
-	case "jpg", "jpeg":
-		return jpeg.Encode(w, i.image, nil)
-	case "gif":
-		return gif.Encode(w, i.image, nil)
-	case "bmp":
-		return gif.Encode(w, i.image, nil)
-	case "tiff", "tif":
-		return gif.Encode(w, i.image, nil)
-	}
-
-	return fmt.Errorf("cannot encode image")
-}
diff --git a/kadai1/tanaka0325/imgconv/go.mod.back b/kadai1/tanaka0325/imgconv/go.mod.back
deleted file mode 100644
index ad64074..0000000
--- a/kadai1/tanaka0325/imgconv/go.mod.back
+++ /dev/null
@@ -1,5 +0,0 @@
-module github.com/gopherdojo/dojo8/kadai1/tanaka0325/imgconv
-
-go 1.14
-
-require golang.org/x/image v0.0.0-20200618115811-c13761719519
diff --git a/kadai1/tanaka0325/imgconv/imgconv.go b/kadai1/tanaka0325/imgconv/imgconv.go
index 29db8da..e80c35c 100644
--- a/kadai1/tanaka0325/imgconv/imgconv.go
+++ b/kadai1/tanaka0325/imgconv/imgconv.go
@@ -9,47 +9,85 @@ import (
 )
 
 var allowedExts = []string{"png", "jpg", "jpeg", "gif", "bmp", "tiff", "tif"}
+var fromExt string
+var toExt string
 
-// Run is to convert image file format
+// Run is to convert image file format.
 func Run(options Options, args Args) error {
-	// validator
+	// // validator
 	if err := options.validate(allowedExts); err != nil {
 		return err
 	}
 
+	fromExt = *options.From
+	toExt = *options.To
+
 	// get target image flepaths from args
-	paths, err := getTargetFilePaths(args, *options.From)
+	paths, err := getTargetFilePaths(args, fromExt)
 	if err != nil {
 		return err
 	}
 
 	// convert
-	imgs, err := createConvImages(paths, *options.From, *options.To)
-	if err != nil {
-		return err
-	}
-	for _, img := range imgs {
-		if err := img.decode(); err != nil {
-			return err
-		}
+	for _, path := range paths {
+		filename := strings.Replace(path, "."+fromExt, "", -1)
+		// "))
+		f := newCnvImage(fromExt)
+		t := newCnvImage(toExt)
 
 		if *options.DryRun {
-			fmt.Println(img.filename+"."+img.fromExt, "=>", img.filename+"."+img.toExt)
-		} else {
-			if err := img.encode(); err != nil {
-				return err
-			}
+			fmt.Printf("%s.%s => %s.%s \n", filename, fromExt, filename, toExt)
+		} else if err := convert(f, t, filename); err != nil {
+			return err
 		}
 	}
 
 	return nil
 }
 
+func convert(d Decoder, e Encoder, filename string) (err error) {
+	// open file
+	r, err := os.Open(filename + "." + fromExt)
+	if err != nil {
+		return
+	}
+	defer r.Close()
+
+	// decode
+	img, err := d.Decode(r)
+	if err != nil {
+		return
+	}
+
+	// create file
+	w, err := os.Create(filename + "." + toExt)
+	if err != nil {
+		return err
+	}
+
+	defer func() {
+		err = w.Close()
+	}()
+
+	// encode
+	if err := e.Encode(w, img); err != nil {
+		return err
+	}
+
+	return
+}
+
 func getTargetFilePaths(args Args, from string) ([]string, error) {
 	uns := args.uniq()
-	paths := []string{}
 
+	paths := []string{}
 	for _, n := range uns {
+		if ok, err := isDir(n); err != nil {
+			return nil, err
+		} else if !ok {
+			return nil, fmt.Errorf("%s is not a directory", n)
+		}
+
 		if err := filepath.Walk(n, func(path string, info os.FileInfo, err error) error {
 			if filepath.Ext(path) == "."+from {
 				paths = append(paths, path)
@@ -63,16 +101,16 @@ func getTargetFilePaths(args Args, from string) ([]string, error) {
 	return paths, nil
 }
 
-func createConvImages(paths []string, from, to string) ([]convImage, error) {
-	images := []convImage{}
-	for _, p := range paths {
-		i := convImage{
-			filename: strings.Replace(p, "."+from, "", 1),
-			fromExt:  strings.ToLower(from),
-			toExt:    strings.ToLower(to),
-		}
-		images = append(images, i)
+func isDir(path string) (bool, error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return false, err
+	}
+
+	fi, err := f.Stat()
+	if err != nil {
+		return false, err
 	}
 
-	return images, nil
+	return fi.IsDir(), nil
 }
diff --git a/kadai1/tanaka0325/imgconv/options.go b/kadai1/tanaka0325/imgconv/options.go
index 3a31e15..1d91f04 100644
--- a/kadai1/tanaka0325/imgconv/options.go
+++ b/kadai1/tanaka0325/imgconv/options.go
@@ -13,13 +13,14 @@ type Options struct {
 	DryRun *bool
 }
 
-func (opt Options) validate(allow_list []string) error {
+func (opt Options) validate(allowList []string) error {
 	to := strings.ToLower(*opt.To)
 	from := strings.ToLower(*opt.From)
 	targetExts := []string{to, from}
+
 	for _, e := range targetExts {
-		if err := include(allow_list, e); err != nil {
-			return fmt.Errorf("%w. ext is only allowd in %s", err, allow_list)
+		if err := include(allowList, e); err != nil {
+			return fmt.Errorf("%w. ext is only allowd in %s", err, allowList)
 		}
 	}
 

From 4d6cc8d5c721d3e0c4b169742c3e426001a90d75 Mon Sep 17 00:00:00 2001
From: Hiroyuki Tanaka <h.tanaka.0325@gmail.com>
Date: Sat, 18 Jul 2020 12:50:58 +0900
Subject: [PATCH 9/9] Fix typo

---
 kadai1/tanaka0325/imgconv/options.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kadai1/tanaka0325/imgconv/options.go b/kadai1/tanaka0325/imgconv/options.go
index 1d91f04..e3e231c 100644
--- a/kadai1/tanaka0325/imgconv/options.go
+++ b/kadai1/tanaka0325/imgconv/options.go
@@ -6,7 +6,7 @@ import (
 	"strings"
 )
 
-// Args is type for command line options.
+// Options is type for command line options.
 type Options struct {
 	From   *string
 	To     *string