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在Go语言中构建命令行
source link: https://sunqi.site/posts/old-sun-learning-go-notes-8-2/
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在Go语言中构建命令行
2023-01-05 约 217 字
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命令行也是应用开发时必不可少的作用，命令行的样式相对比较统一，Go中提供了flag包用于定义命令行参数。
package main
import (
"flag"
"fmt"
)
func main() {
wordPtr := flag.String("word", "foo", "a string")
numbPtr := flag.Int("numb", 42, "an int")
forkPtr := flag.Bool("fork", false, "a bool")
var svar string
flag.StringVar(&svar, "svar", "bar", "a string var")
flag.Parse()
fmt.Println("word:", *wordPtr)
fmt.Println("numb:", *numbPtr)
fmt.Println("fork:", *forkPtr)
fmt.Println("svar:", svar)
fmt.Println("tail:", flag.Args())
}
go run test_command_line.go --help
返回如下，基本可以满足常用命令行的构建
Usage of /tmp/go-build3476798509/b001/exe/test_command_line:
-fork
a bool
-numb int
an int (default 42)
-svar string
a string var (default "bar")
-word string
a string (default "foo")
当然也有很多第三方提供的Parser
- Kong is a command-line parser for Go(https://github.com/alecthomas/kong)
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