cflag

cflag

cflag - Wraps and extends go flag.FlagSet to build simple command line applications

• Supports auto-rendering of pretty help messages
• Allows adding short options to flag options, and multiples
• Allows binding named arguments
• Allows setting arguments or options as required
• Allows setting validators for arguments or options

中文说明

Install

go get github.com/gookit/goutil/cflag

Go docs

• Go docs

Usage

Examples, code please see _example/cmd.go

package main

import (
	"github.com/gookit/goutil/cflag"
	"github.com/gookit/goutil/cliutil"
)

var opts = struct {
    age  int
    name string
    str1 string
    lOpt string
    bol  bool
}{}

// go run ./_example/cmd.go
// go run ./cflag/_example/cmd.go -h
// go run ./cflag/_example/cmd.go --name inhere --lo val ab cd
func main() {
	c := cflag.New(func(c *cflag.CFlags) {
		c.Desc = "this is a demo command"
		c.Version = "0.5.1"
	})
	c.IntVar(&opts.age, "age", 0, "this is a int option;;a")
	c.StringVar(&opts.name, "name", "", "this is a string option and required;true")
	c.StringVar(&opts.str1, "str1", "def-val", "this is a string option with default value;;s")
	c.StringVar(&opts.lOpt, "long-opt", "", "this is a string option with shorts;;lo")

	c.AddArg("arg1", "this is arg1", true, nil)
	c.AddArg("arg2", "this is arg2", true, nil)

	c.Func = func(c *cflag.CFlags) error {
		cliutil.Magentaln("hello, this is command:", c.Name())
		cliutil.Infoln("option.age =", opts.age)
		cliutil.Infoln("option.name =", opts.name)
		cliutil.Infoln("option.str1 =", opts.str1)
		cliutil.Infoln("option.lOpt =", opts.lOpt)
		cliutil.Infoln("arg1 =", c.Arg("arg1").String())
		cliutil.Infoln("arg2 =", c.Arg("arg2").String())
		cliutil.Infoln("remain args =", c.RemainArgs())

		return nil
	}

	// c.MustParse(os.Args[1:])
	c.MustParse(nil)
}

Bind and get arguments

Bind arguments:

	c.AddArg("arg1", "this is arg1", true, nil)
	c.AddArg("arg2", "this is arg2", true, nil)

Get arguments by name:

	cliutil.Infoln("arg1 =", c.Arg("arg1").String())
	cliutil.Infoln("arg2 =", c.Arg("arg2").String())

Set required and short options

Options can be set as required, and short option names can be set.

TIPs: Implements required and shorts by extending usage with options parsed

Format:

• format1: desc;required
• format2: desc;required;shorts
• required: a bool string. mark option is required
  • True: true,on,yes
  • False: false,off,no,''
• shorts: shortcut names for option, allow multi values, split by comma ,

Examples:

    // set option 'name' is required
	c.StringVar(&opts.name, "name", "", "this is a string option and required;true")
    // set option 'str1' shorts: s
	c.StringVar(&opts.str1, "str1", "def-val", "this is a string option with default value;;s")

Show help

go run ./cflag/_example/cmd.go -h

Output:

Run command

go run ./cflag/_example/cmd.go --name inhere -a 12 --lo val ab cd
go run ./cflag/_example/cmd.go --name inhere -a 12 --lo val ab cd de fg

Output:

required Check

go run ./cflag/_example/cmd.go -a 22
go run ./cflag/_example/cmd.go --name inhere

Output:

Cli application

Use cflag to quickly build a multi-command application.

package main

import (
	"github.com/gookit/goutil/cflag"
	"github.com/gookit/goutil/dump"
)

var c1Opts = struct {
	age  int
	name string
}{}

var c2Opts = struct {
	str1 string
	lOpt string
	bol  bool
}{}

// go run ./_example/app.go
// go run ./cflag/_example/app.go -h
// go run ./cflag/_example/app.go demo -h
func main() {
	app := cflag.NewApp()
	app.Desc = "this is my cli application"
	app.Version = "1.0.2"

	// go run ./cflag/_example/app.go demo --name inhere --age 333 val0 val1
	c1 := cflag.NewCmd("demo", "this is a demo command")
	c1.OnAdd = func(c *cflag.Cmd) {
		c.IntVar(&c1Opts.age, "age", 0, "this is a int option;;a")
		c.StringVar(&c1Opts.name, "name", "", "this is a string option and required;true")

		c.AddArg("arg1", "this is arg1", true, nil)
		c.AddArg("arg2", "this is arg2", false, nil)
	}
	c1.Func = func(c *cflag.Cmd) error {
		dump.P(c1Opts, c.Args())
		return nil
	}

	// Multiple commands can be added
	app.Add(c1)

	app.Run()
}

Show commands

go run ./cflag/_example/app.go -h

Run command

go run ./cflag/_example/app.go demo --name inhere --age 333 val0 val1