第一个golang项目增加help指令并调整指令模式

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第一个golang项目增加help指令并调整指令模式

调整指令模式
增加help指令
减少了配置文件的解析读取次数
新指令模式
打包并运行

上一篇文章

调整指令模式

version指令修改为-v和-version
replace指令修改为-r和-replace
dir参数修改为-d和 -directory

package commandsimport ("flag""fmt""log""os""strings""github.com/spf13/viper"
)var (help    boolversion boolreplace booldirectory string
)func Init() {flag.BoolVar(&help, "h", false, "this `help` and exit")flag.BoolVar(&help, "help", false, "this `help` and exit")flag.BoolVar(&version, "v", false, "show `version` and exit")flag.BoolVar(&version, "version", false, "show `version` and exit")flag.BoolVar(&replace, "r", false, "send `replace` to process and replace content for scan files under directory.")flag.BoolVar(&replace, "replace", false, "send `replace` to process and replace content for scan files under directory.")// 注意 `directory`。默认是 -d string，有了 `directory` 之后，变为 -d directoryflag.StringVar(&directory, "d", "", "send `directory` to process: standard, standard-fix, saas, saas-fix")flag.StringVar(&directory, "directory", "", "send `directory` to process: standard, standard-fix, saas, saas-fix")// 改变默认的 Usageflag.Usage = usageviper.SetConfigName("config") // 配置文件名（不包含扩展名）viper.SetConfigType("toml")   // 配置文件格式viper.AddConfigPath(".")      // 查找配置文件的路径if err := viper.ReadInConfig(); err != nil {log.Fatalf("Error reading config file, %s", err)}flag.Parse()
}func usage() {version := viper.Get("version").(string)cmd := os.Args[0]fmt.Fprintf(os.Stderr, `%s version: %s
Usage: %s [-hvq] [-d,directory directory]Options:
`, cmd, version, cmd)flag.PrintDefaults()
}func Run() {Init()if help {flag.Usage()} else if version {Version()} else if replace {dir := "standard"if strings.TrimSpace(directory) != "" {dir = directory}Replace(dir)} else {flag.Usage()}
}

增加help指令

-h和-help指令，打印程序已知参数列表及参数说明

func usage() {version := viper.Get("version").(string)cmd := os.Args[0]fmt.Fprintf(os.Stderr, `%s version: %s
Usage: %s [-hvq] [-d,directory directory]Options:
`, cmd, version, cmd)flag.PrintDefaults()
}

减少了配置文件的解析读取次数

在程序执行初始化时解析一次，后续皆可使用

func Init() {flag.BoolVar(&help, "h", false, "this `help` and exit")flag.BoolVar(&help, "help", false, "this `help` and exit")flag.BoolVar(&version, "v", false, "show `version` and exit")flag.BoolVar(&version, "version", false, "show `version` and exit")flag.BoolVar(&replace, "r", false, "send `replace` to process and replace content for scan files under directory.")flag.BoolVar(&replace, "replace", false, "send `replace` to process and replace content for scan files under directory.")// 注意 `directory`。默认是 -d string，有了 `directory` 之后，变为 -d directoryflag.StringVar(&directory, "d", "", "send `directory` to process: standard, standard-fix, saas, saas-fix")flag.StringVar(&directory, "directory", "", "send `directory` to process: standard, standard-fix, saas, saas-fix")// 改变默认的 Usageflag.Usage = usageviper.SetConfigName("config") // 配置文件名（不包含扩展名）viper.SetConfigType("toml")   // 配置文件格式viper.AddConfigPath(".")      // 查找配置文件的路径if err := viper.ReadInConfig(); err != nil {log.Fatalf("Error reading config file, %s", err)}flag.Parse()
}

新指令模式

func Run() {Init()if help {flag.Usage()} else if version {Version()} else if replace {dir := "standard"if strings.TrimSpace(directory) != "" {dir = directory}Replace(dir)} else {flag.Usage()}
}

打包并运行

go build -v -ldflags "-linkmode external -extldflags '-static' -w" -o devtools.exe main.go
devtools.exe -h
devtools.exe -help
devtools.exe -v
devtools.exe -version
devtools.exe -r -d saas
devtools.exe -replace -directory saas

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