一文秒懂Go 编写命令行工具的代码

module btb

go 1.15

require (
	github.com/cheggaaa/pb/v3 v3.0.5
	github.com/fatih/color v1.10.0
	github.com/urfave/cli/v2 v2.3.0
)

import (
	"btb/constants"
	"btb/service"
	"github.com/urfave/cli/v2"
	"log"
	"os"
)

func main() {
	var model string
	downloadPath := constants.DownloadPath
	markdownPath := constants.MarkdownPath

	app := &cli.App{
		Flags: []cli.Flag{
			&cli.StringFlag{
				Name:  "model",
				Usage:  "operating mode; r:replace, b:backup",
				DefaultText: "b",
				Aliases:  []string{"m"},
				Required: true,
				Destination: &model,
			},
			&cli.StringFlag{
				Name:  "download-path",
				Usage:  "The path where the image is stored",
				Aliases:  []string{"dp"},
				Destination: &downloadPath,
				Required: true,
				Value:  constants.DownloadPath,
			},
			&cli.StringFlag{
				Name:  "markdown-path",
				Usage:  "The path where the markdown file is stored",
				Aliases:  []string{"mp"},
				Destination: &markdownPath,
				Required: true,
				Value:  constants.MarkdownPath,
			},
		},
		Action: func(c *cli.Context) error {
			service.DownLoadPic(markdownPath, downloadPath)

			return nil
		},
		Name: "btb",
		Usage: "Help you backup and replace your blog's images",
	}

	err := app.Run(os.Args)
	if err != nil {
		log.Fatal(err)
	}
}

func DownLoadPic(markdownPath, downloadPath string) {
	wg := sync.WaitGroup{}
	allFile, err := util.GetAllFile(markdownPath)
	wg.Add(len(*allFile))

	if err != nil {
		log.Fatal("read file error")
	}

	for _, filePath := range *allFile {

		go func(filePath string) {
			allLine, err := util.ReadFileLine(filePath)
			if err != nil {
				log.Fatal(err)
			}
			availableImgs := util.MatchAvailableImg(allLine)
			bar := pb.ProgressBarTemplate(constants.PbTmpl).Start(len(*availableImgs))
			bar.Set("fileName", filePath).
				SetWidth(120)

			for _, url := range *availableImgs {
				if err != nil {
					log.Fatal(err)
				}
				err := util.DownloadFile(url, *genFullFileName(downloadPath, filePath, &url))
				if err != nil {
					log.Fatal(err)
				}
				bar.Increment()

			}
			bar.Finish()
			wg.Done()

		}(filePath)
	}
	wg.Wait()
	color.Green("Successful handling of [%v] files.\n", len(*allFile))

	if err != nil {
		log.Fatal(err)
	}
}

# Binary name
BINARY=btb
GOBUILD=go build -ldflags "-s -w" -o ${BINARY}
GOCLEAN=go clean
RMTARGZ=rm -rf *.gz
VERSION=0.0.1

release:
	# Clean
	$(GOCLEAN)
	$(RMTARGZ)
	# Build for mac
	CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 $(GOBUILD)
	tar czvf ${BINARY}-mac64-${VERSION}.tar.gz ./${BINARY}
	# Build for arm
	$(GOCLEAN)
	CGO_ENABLED=0 GOOS=linux GOARCH=arm64 $(GOBUILD)
	tar czvf ${BINARY}-arm64-${VERSION}.tar.gz ./${BINARY}
	# Build for linux
	$(GOCLEAN)
	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 $(GOBUILD)
	tar czvf ${BINARY}-linux64-${VERSION}.tar.gz ./${BINARY}
	# Build for win
	$(GOCLEAN)
	CGO_ENABLED=0 GOOS=windows GOARCH=amd64 $(GOBUILD).exe
	tar czvf ${BINARY}-win64-${VERSION}.tar.gz ./${BINARY}.exe
	$(GOCLEAN)

curl -fsSL https://raw.githubusercontent.com/crossoverJie/btb/master/install.sh | bash