golang 实现的命令行解析库 clop v0.0.1版本发布
clop
clop 是一款基于struct的命令行解析器，麻雀虽小，五脏俱全。(从零实现)
地址
https://gitee.com/guonaihong/clop
https://github.com/guonaihong/clop
feature
- 支持环境变量绑定
env DEBUG=xx ./proc - 支持参数搜集
cat a.txt b.txt，可以把a.txt, b.txt散装成员归归类，收集到你指定的结构体成员里 - 支持短选项
proc -d或者长选项proc --debug不在话下 - posix风格命令行支持，支持命令组合
ls -ltr是ls -l -t -r简写形式，方便实现普通posix 标准命令 - 子命令支持，方便实现git风格子命令
git add，简洁的子命令注册方式，只要会写结构提就行，3,4,5到无穷尽子命令也支持，只要你喜欢，用上clop就可以实现 - 默认值支持
default:"1"，支持多种数据类型，让你省去类型转换的烦恼 - 贴心的重复命令报错
- 严格的短选项，长选项报错。避免二义性选项诞生
- 效验模式支持，不需要写一堆的
if x!= ""orif y!=0浪费青春的代码
内容
Installation
go get github.com/guonaihong/clop
Quick start
package main import ( "fmt" "github.com/guonaihong/clop" ) type Hello struct { File string `clop:"-f; --file" usage:"file"` } func main() { h := Hello{} clop.Bind(&h) fmt.Printf("%#v\n", h) } // ./one -f test // main.Hello{File:"test"} // ./one --file test // main.Hello{File:"test"}
example
required flag
package main import ( "fmt" "github.com/guonaihong/clop" ) type curl struct { Url string `clop:"-u; --url" usage:"url" valid:"required"` } func main() { c := curl{} clop.Bind(&c) }
set default value
可以使用default tag设置默认值，普通类型直接写，复合类型用json表示
package main import ( "fmt" "github.com/guonaihong/clop" ) type defaultExample struct { Int int `default:"1"` Float64 float64 `default:"3.64"` Float32 float32 `default:"3.32"` SliceString []string `default:"[\"one\", \"two\"]"` SliceInt []int `default:"[1,2,3,4,5]"` SliceFloat64 []float64 `default:"[1.1,2.2,3.3,4.4,5.5]"` } func main() { de := defaultExample{} clop.Bind(&de) fmt.Printf("%v\n", de) } // run // ./use_def // output: // {1 3.64 3.32 [one two] [1 2 3 4 5] [1.1 2.2 3.3 4.4 5.5]}
Support environment variables
// file name use_env.go package main import ( "fmt" "github.com/guonaihong/clop" ) type env struct { OmpNumThread string `clop:"env=omp_num_thread" usage:"omp num thread"` Path string `clop:"env=XPATH" usage:"xpath"` Max int `clop:"env=MAX" usage:"max thread"` } func main() { e := env{} clop.Bind(&e) fmt.Printf("%#v\n", e) } // run // env XPATH=`pwd` omp_num_thread=3 MAX=4 ./use_env // output // main.env{OmpNumThread:"3", Path:"/home/guo", Max:4}
subcommand
package main import ( "fmt" "github.com/guonaihong/clop" ) type add struct { All bool `clop:"-A; --all" usage:"add changes from all tracked and untracked files"` Force bool `clop:"-f; --force" usage:"allow adding otherwise ignored files"` Pathspec []string `clop:"args=pathspec"` } type mv struct { Force bool `clop:"-f; --force" usage:"allow adding otherwise ignored files"` } type git struct { Add add `clop:"subcommand=add" usage:"Add file contents to the index"` Mv mv `clop:"subcommand=mv" usage:"Move or rename a file, a directory, or a symlink"` } func main() { g := git{} clop.Bind(&g) fmt.Printf("git:%#v\n", g) fmt.Printf("git:set mv(%t) or set add(%t)\n", clop.IsSetSubcommand("mv"), clop.IsSetSubcommand("add")) } // run: // ./git add -f // output: // git:main.git{Add:main.add{All:false, Force:true, Pathspec:[]string(nil)}, Mv:main.mv{Force:false}} // git:set mv(false) or set add(true)
Implementing linux command options
cat
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) } /* Usage: ./cat [Flags] <files> Flags: -E,--show-ends display $ at end of each line -T,--show-tabs display TAB characters as ^I -c,--number-nonblank number nonempty output lines, overrides -n,--number number all output lines -s,--squeeze-blank suppress repeated empty output lines -v,--show-nonprinting use ^ and M- notation, except for LFD and TAB Args: <files> */
