cmdline-擴充golang std.flag

這是一個建立於 的文章，其中的資訊可能已經有所發展或是發生改變。

基於golang 1.6.2 flag 源碼做了一個擴充
使命令列協助資訊更完整更清晰，更便於使用
源碼地址： http://github.com/vipally/cmdline

//Ally(vipally@gmail.com) modify from std.flag version 1.6.2
//1. Add LogicName and Required field for every flag, and modify the flag define interface
//2. Add Summary and Details for commond line info
//3. Add interface GetUsage() string
//4. Modify the Parse() logic

func main() {    cmdline.Summary("command copy is used to copy a file to another path.")    cmdline.Details(`Command copy is used to copy a file to another path.    If the destnation file is exist, default ask for if will cover it.    If flag -y used, it will cover the destnation file without ask.    If flag -n used, it will not cover the destnation file without ask.`)    cmdline.String("s", "src", ".", true, "source file path")    cmdline.String("d", "dst", ".", true, "destnation file path")    cmdline.Bool("c", "cover", false, false, "if cover the destnation file")    cmdline.Bool("y", "yes", false, false, "if auto select yes when ask for cover")    cmdline.Bool("n", "no", false, false, "if auto select no when ask for cover")    cmdline.Parse()    //[error] require but lack of flag -s=<src>    //Usage of [copy.exe]:    //  Summary:    //    command copy is used to copy a file to another path    //    //  Usage:    //    copy.exe [-c=<cover>] -d=<dst> [-n=<no>] -s=<src> [-y=<yes>]    //  -c=<cover>    //      if cover the destnation file    //  -d=<dst>  required  string (default ".")    //      destnation file path    //  -n=<no>    if auto select no when ask for cover    //  -s=<src>  required  string (default ".")    //      source file path    //  -y=<yes>    //      if auto select yes when ask for cover    //    //  Details:    //    Command copy is used to copy a file to another path.    //    If the destnation file is exist, default ask for if will cover it.    //    If flag -y used, it will cover the destnation file without ask.    //    If flag -n used, it will not cover the destnation file without ask.}