从零实现一个命令行解析器

出发点

分享下从零实现一个命令解析器的所有细节。

项目地址

https://github.com/guonaihong/clop

一个简单的例子(以 linux cat 命令举例)

package main import ( "fmt" "github.com/guonaihong/clop" ) type cat struct { NumberNonblank bool `clop:"-c;--number-nonblank" usage:"number nonempty output lines, overrides"` ShowEnds bool `clop:"-E;--show-ends" usage:"display $ at end of each line"` Number bool `clop:"-n;--number" usage:"number all output lines"` SqueezeBlank bool `clop:"-s;--squeeze-blank" usage:"suppress repeated empty output lines"` ShowTab bool `clop:"-T;--show-tabs" usage:"display TAB characters as ^I"` ShowNonprinting bool `clop:"-v;--show-nonprinting" usage:"use ^ and M- notation, except for LFD and TAB" ` Files []string `clop:"args=files"` } func main() { c := cat{} err := clop.Bind(&c) fmt.Printf("%#v, %s\n", c, err) }