Kadai2 edm20627

kadai1/edm20627/.gitignore

@@ -0,0 +1,17 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+.DS_store

kadai1/edm20627/README.md

@@ -0,0 +1,12 @@
+# 画像変換コマンド
+指定ディレクトリ以下の画像ファイルを変換します。
+
+## 使用方法
+
+`cmd --from jpg --to png ディレクトリ`
+
+## オプション
+
+* `--from(-f)` 変換対象の画像形式(デフォルト: jpg)
+* `--to(-t)` 変換後の画像形式(デフォルト: png)
+* `--delete(-d)` 変換前の画像を削除(デフォルト: 無効)

kadai1/edm20627/go.mod

@@ -0,0 +1,3 @@
+module github.com/edm20627/gopherdojo-studyroom/kadai1/edm20627
+
+go 1.15

kadai1/edm20627/imageconvert/imageconvert.go

@@ -0,0 +1,108 @@
+package imageconvert
+
+import (
+	"errors"
+	"image"
+	"image/gif"
+	"image/jpeg"
+	"image/png"
+	"os"
+	"path/filepath"
+)
+
+// Supported extensions.
+var SupportedFormat = []string{"png", "jpg", "jpeg", "gif"}
+
+type ConvertImage struct {
+	filepaths    []string
+	From, To     string
+	DeleteOption bool
+}
+
+// Get the target files for image conversion.
+func (ci *ConvertImage) Get(dirs []string) error {
+	for _, dir := range dirs {
+		err := filepath.Walk(dir,
+			func(path string, info os.FileInfo, err error) error {
+				if info == nil {
+					return errors.New(path + " is not directory")
+				}
+				if info.IsDir() || filepath.Ext(path)[1:] != ci.From {
+					return nil
+				}
+				ci.filepaths = append(ci.filepaths, path)
+				return nil
+			})
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Perform image conversion.
+func (ci *ConvertImage) Convert() error {
+	for _, path := range ci.filepaths {
+		err := convert(path, ci.To, ci.DeleteOption)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Check for supported extensions.
+func (ci *ConvertImage) Valid() bool {
+	for _, v := range SupportedFormat {
+		if v == ci.From {
+			for _, v := range SupportedFormat {
+				if v == ci.To {
+					return true
+				}
+			}
+		}
+	}
+	return false
+}
+
+func convert(path string, to string, deleteOption bool) error {
+	f, err := os.Open(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	img, _, err := image.Decode(f)
+	if err != nil {
+		return err
+	}
+
+	out, err := os.Create(path[:len(path)-len(filepath.Ext(path))+1] + to)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+
+	switch to {
+	case "png":
+		if err := png.Encode(out, img); err != nil {
+			return err
+		}
+	case "jpg", "jpeg":
+		if err := jpeg.Encode(out, img, nil); err != nil {
+			return err
+		}
+	case "gif":
+		if err := gif.Encode(out, img, nil); err != nil {
+			return err
+		}
+	}
+
+	if deleteOption {
+		if err := os.Remove(path); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

kadai1/edm20627/main.go

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+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/edm20627/gopherdojo-studyroom/kadai1/edm20627/imageconvert"
+)
+
+var ci = imageconvert.ConvertImage{}
+
+func init() {
+	flag.StringVar(&ci.From, "-from", "jpg", "Specify the image format before conversion")
+	flag.StringVar(&ci.From, "f", "jpg", "Specify the image format before conversion (short)")
+	flag.StringVar(&ci.To, "-to", "png", "Specify the converted image format")
+	flag.StringVar(&ci.To, "t", "png", "Specify the converted image format (short)")
+	flag.BoolVar(&ci.DeleteOption, "-delete", false, "Delete the image before conversion")
+	flag.BoolVar(&ci.DeleteOption, "d", false, "Delete the image before conversion (short)")
+}
+
+func main() {
+	flag.Parse()
+	dirs := flag.Args()
+
+	if !ci.Valid() {
+		fmt.Fprintln(os.Stderr, "supported formt is "+strings.Join(imageconvert.SupportedFormat, ", "))
+		os.Exit(1)
+	}
+
+	err := ci.Get(dirs)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+
+	err = ci.Convert()
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}

kadai2/edm20627/.gitignore

@@ -0,0 +1,17 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+.DS_store

kadai2/edm20627/README.md

@@ -0,0 +1,12 @@
+# 画像変換コマンド
+指定ディレクトリ以下の画像ファイルを変換します。
+
+## 使用方法
+
+`cmd --from jpg --to png ディレクトリ`
+
+## オプション
+
+* `--from(-f)` 変換対象の画像形式(デフォルト: jpg)
+* `--to(-t)` 変換後の画像形式(デフォルト: png)
+* `--delete(-d)` 変換前の画像を削除(デフォルト: 無効)

kadai2/edm20627/go.mod

@@ -0,0 +1,3 @@
+module github.com/edm20627/gopherdojo-studyroom/kadai2/edm20627
+
+go 1.15

kadai2/edm20627/go.sum

@@ -0,0 +1 @@
+github.com/edm20627/gopherdojo-studyroom v0.0.0-20200808023015-dd3cfe05cf7a h1:qrHQJOIqb8bC1Ulkv5H6eGp3DZgRA93eLUJr6XK/Gjk=

kadai2/edm20627/imageconvert/imageconvert.go

@@ -0,0 +1,117 @@
+package imageconvert
+
+import (
+	"errors"
+	"image"
+	"image/gif"
+	"image/jpeg"
+	"image/png"
+	"os"
+	"path/filepath"
+)
+
+// Supported extensions.
+var SupportedFormat = []string{"png", "jpg", "jpeg", "gif"}
+
+var (
+	ErrNotSpecified = errors.New("Need to specify directory or file")
+	ErrNotDirectory = errors.New("Specify directory or file is not directory")
+)
+
+type ConvertImage struct {
+	Filepaths    []string
+	From, To     string
+	DeleteOption bool
+}
+
+// Get the target files for image conversion.
+func (ci *ConvertImage) Get(dirs []string) error {
+	if len(dirs) == 0 {
+		return ErrNotSpecified
+	}
+
+	for _, dir := range dirs {
+		err := filepath.Walk(dir,
+			func(path string, info os.FileInfo, err error) error {
+				if info == nil {
+					return ErrNotDirectory
+				}
+				if info.IsDir() || filepath.Ext(path)[1:] != ci.From {
+					return nil
+				}
+				ci.Filepaths = append(ci.Filepaths, path)
+				return nil
+			})
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Perform image conversion.
+func (ci *ConvertImage) Convert() error {
+	for _, path := range ci.Filepaths {
+		err := convert(path, ci.To, ci.DeleteOption)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Check for supported extensions.
+func (ci *ConvertImage) Valid() bool {
+	var fromSupported, toSupported bool
+	for _, v := range SupportedFormat {
+		if v == ci.From {
+			fromSupported = true
+		}
+		if v == ci.To {
+			toSupported = true
+		}
+	}
+	return fromSupported && toSupported
+}
+
+func convert(path string, to string, deleteOption bool) error {
+	f, err := os.Open(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	img, _, err := image.Decode(f)
+	if err != nil {
+		return err
+	}
+
+	out, err := os.Create(path[:len(path)-len(filepath.Ext(path))+1] + to)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+
+	switch to {
+	case "png":
+		if err := png.Encode(out, img); err != nil {
+			return err
+		}
+	case "jpg", "jpeg":
+		if err := jpeg.Encode(out, img, nil); err != nil {
+			return err
+		}
+	case "gif":
+		if err := gif.Encode(out, img, nil); err != nil {
+			return err
+		}
+	}
+
+	if deleteOption {
+		if err := os.Remove(path); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}