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1 change: 1 addition & 0 deletions .gitignore
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kadai1/image-convert
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29 changes: 29 additions & 0 deletions kadai1/README.md
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# 課題 1:画像変換コマンドを作ろう

画像を指定の形式に変換する
変換後の画像ファイルは元の画像と同じディレクトリに配置される

## コマンドラインオプション

| オプション | 値の説明 | デフォルト値 |
| ---------- | -------------------------------------- | ------------ |
| -from | 変換前の画像形式(jpg,jpeg,pngから選択) | jpg |
| -to | 変換後の画像形式(jpg,jpeg,pngから選択) | png |
| -dir | ディレクトリの指定 | ./ |

## 使い方

- ビルド

```bash
go build -o image-convert
```

- ディレクトリを指定して実行

```bash
./image-convert [...options] [directory]
```
```example
./image-convert -from png -to jpg -dir d1
```
67 changes: 67 additions & 0 deletions kadai1/convert/convert.go
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package convert

import (
"image"
"image/jpeg"
"image/png"
"os"
"path/filepath"
)

func GetSelectedExtensionPath(fileType string, directory string) ([]string, error) {
var retval []string
err := filepath.Walk(directory, func(path string, info os.FileInfo, err error) error {
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パスはディレクトリも含んでいるため、ディレクトリではないかのチェックが必要です。
例えばxxx.jpgという名前のディレクトリがあると誤動作します。

if err != nil {
return err
}
if filepath.Ext(path) == "."+fileType {
if f, err := os.Stat(path); !(os.IsNotExist(err) || f.IsDir()) {
retval = append(retval, path)
}
}

return nil
})
if err != nil {
return nil, err
}
return retval, nil
}

func ConvertImage(fileName string, to string) error {
f, err := os.Open(fileName)
if err != nil {
return err
}
defer f.Close()

img, _, err := image.Decode(f)
if err != nil {
return err
}

out, err := os.Create(fileName[:len(fileName)-len(filepath.Ext(fileName))+1] + to)
if err != nil {
return err
}
defer out.Close()

switch to {
case "jpg", "jpeg":
if err := jpeg.Encode(out, img, nil); err != nil {
return err
}
case "png":
if err := png.Encode(out, img); err != nil {
return err
}
default:

}

if err := os.Remove(fileName); err != nil {
return err
}

return nil
}
Binary file added kadai1/d1/JPG.png
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12 changes: 12 additions & 0 deletions kadai1/go.mod
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module image-convert

go 1.17

require (
github.com/yuin/goldmark v1.3.5 // indirect
golang.org/x/mod v0.4.2 // indirect
golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4 // indirect
golang.org/x/sys v0.0.0-20210510120138-977fb7262007 // indirect
golang.org/x/tools v0.1.5 // indirect
golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
)
28 changes: 28 additions & 0 deletions kadai1/go.sum
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@@ -0,0 +1,28 @@
github.com/yuin/goldmark v1.3.5 h1:dPmz1Snjq0kmkz159iL7S6WzdahUTHnHB5M56WFVifs=
github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/mod v0.4.2 h1:Gz96sIWK3OalVv/I/qNygP42zyoKp3xptRVCWRFEBvo=
golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4 h1:4nGaVu0QrbjT/AK2PRLuQfQuh6DJve+pELhqTdAj3x0=
golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210510120138-977fb7262007 h1:gG67DSER+11cZvqIMb8S8bt0vZtiN6xWYARwirrOSfE=
golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
golang.org/x/tools v0.1.5 h1:ouewzE6p+/VEB31YYnTbEJdi8pFqKp4P4n85vwo3DHA=
golang.org/x/tools v0.1.5/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
36 changes: 36 additions & 0 deletions kadai1/main.go
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package main

import (
"flag"
"image-convert/convert"
"log"
)

type cmdArgs struct {
from string
to string
dir string
}

func parseArgs() *cmdArgs {
var cmd cmdArgs
flag.StringVar(&cmd.from, "from", "jpg", "from")
flag.StringVar(&cmd.to, "to", "png", "to")
flag.StringVar(&cmd.dir, "dir", "./", "directory")
flag.Parse()
return &cmd
}

func main() {
var args = parseArgs()
var convertList, err = convert.GetSelectedExtensionPath(args.from, args.dir)
if err != nil {
log.Fatal(err)
}
for _, v := range convertList {
err := convert.ConvertImage(v, args.to)
if err != nil {
log.Fatal(err)
}
}
}