GCli

A simple to use command line application, written using golang.

中文说明

Screenshots

Features

• Simple to use
• Support for adding multiple commands and supporting command aliases
• When the command entered is incorrect, a similar command will be prompted(including an alias prompt)
• Support option binding --long, support for adding short options(-s)
• POSIX-style short flag combining (-a -b = -ab).
• Support binding argument to specified name, support required, optional, array three settings
  • It will be automatically detected and collected when the command is run.
• Supports rich color output. powered by gookit/color
  • Supports html tab-style color rendering, compatible with Windows
  • Built-in info, error, success, danger and other styles, can be used directly
• Built-in user interaction methods: ReadLine, Confirm, Select, MultiSelect ...
• Built-in progress display methods: Txt, Bar, Loading, RoundTrip, DynamicText ...
• Automatically generate command help information and support color display
• Supports generation of zsh and bash command completion script files
• Supports a single command as a stand-alone application

GoDoc

• godoc for gopkg
• godoc for github

Quick start

import "gopkg.in/gookit/gcli.v2" // is recommended
// or
import "github.com/gookit/gcli"

package main

import (
    "runtime"
    "github.com/gookit/gcli"
    "github.com/gookit/gcli/_examples/cmd"
)

// for test run: go build ./_examples/cliapp.go && ./cliapp
func main() {
    runtime.GOMAXPROCS(runtime.NumCPU())

    app := gcli.NewApp()
    app.Version = "1.0.3"
    app.Description = "this is my cli application"
    // app.SetVerbose(gcli.VerbDebug)

    app.Add(cmd.ExampleCommand())
    app.Add(&gcli.Command{
        Name: "demo",
        // allow color tag and {$cmd} will be replace to 'demo'
        UseFor: "this is a description <info>message</> for {$cmd}", 
        Aliases: []string{"dm"},
        Func: func (cmd *gcli.Command, args []string) error {
            gcli.Print("hello, in the demo command\n")
            return 0
        },
    })

    // .... add more ...

    app.Run()
}

Usage

• build a demo package

% go build ./_examples/cliapp.go                                                           

Display version

% ./cliapp --version
this is my cli application

Version: 1.0.3                                                           

Display app help

by ./cliapp or ./cliapp -h or ./cliapp --help

Examples:

./cliapp
./cliapp -h # can also
./cliapp --help # can also

Run a command

% ./cliapp example -c some.txt -d ./dir --id 34 -n tom -n john val0 val1 val2 arrVal0 arrVal1 arrVal2

you can see:

Display command help

by ./cliapp example -h or ./cliapp example --help

Display command tips

Generate auto completion scripts

import  "github.com/gookit/gcli/builtin"

    // ...
    // add gen command(gen successful you can remove it)
    app.Add(builtin.GenAutoCompleteScript())

Build and run command(This command can be deleted after success.)：

% go build ./_examples/cliapp.go && ./cliapp genac -h // display help
% go build ./_examples/cliapp.go && ./cliapp genac // run gen command

will see:

INFO: 
  {shell:zsh binName:cliapp output:auto-completion.zsh}

Now, will write content to file auto-completion.zsh
Continue? [yes|no](default yes): y

OK, auto-complete file generate successful

After running, it will generate an auto-completion.{zsh|bash} file in the current directory, and the shell environment name is automatically obtained. Of course you can specify it manually at runtime

Generated shell script file ref：

• bash env auto-completion.bash
• zsh env auto-completion.zsh

Preview:

Write a command

About argument definition

• Required argument cannot be defined after optional argument
• Only one array parameter is allowed
• The (array) argument of multiple values ​​can only be defined at the end

Simple use

app.Add(&gcli.Command{
    Name: "demo",
    // allow color tag and {$cmd} will be replace to 'demo'
    UseFor: "this is a description <info>message</> for command", 
    Aliases: []string{"dm"},
    Func: func (cmd *gcli.Command, args []string) error {
        gcli.Print("hello, in the demo command\n")
        return nil
    },
})

Write go file

the source file at: example.go

package cmd

import (
	"fmt"
	"github.com/gookit/color"
	"github.com/gookit/gcli"
)

// options for the command
var exampleOpts = struct {
	id  int
	c   string
	dir string
	opt string
	names gcli.Strings
}{}

// ExampleCommand command definition
func ExampleCommand() *gcli.Command {
	cmd := &gcli.Command{
		Name:        "example",
		UseFor: "this is a description message",
		Aliases:     []string{"exp", "ex"},
		Func:          exampleExecute,
		// {$binName} {$cmd} is help vars. '{$cmd}' will replace to 'example'
		Examples: `{$binName} {$cmd} --id 12 -c val ag0 ag1
  <cyan>{$fullCmd} --names tom --names john -n c</> test use special option`,
	}

	// bind options
	cmd.IntOpt(&exampleOpts.id, "id", "", 2, "the id option")
	cmd.StrOpt(&exampleOpts.c, "config", "c", "value", "the config option")
	// notice `DIRECTORY` will replace to option value type
	cmd.StrOpt(&exampleOpts.dir, "dir", "d", "", "the `DIRECTORY` option")
	// setting option name and short-option name
	cmd.StrOpt(&exampleOpts.opt, "opt", "o", "", "the option message")
	// setting a special option var, it must implement the flag.Value interface
	cmd.VarOpt(&exampleOpts.names, "names", "n", "the option message")

	// bind args with names
	cmd.AddArg("arg0", "the first argument, is required", true)
	cmd.AddArg("arg1", "the second argument, is required", true)
	cmd.AddArg("arg2", "the optional argument, is optional")
	cmd.AddArg("arrArg", "the array argument, is array", false, true)

	return cmd
}

// command running
// example run:
// 	go run ./_examples/cliapp.go ex -c some.txt -d ./dir --id 34 -n tom -n john val0 val1 val2 arrVal0 arrVal1 arrVal2
func exampleExecute(c *gcli.Command, args []string) error {
	fmt.Print("hello, in example command\n")
	
	magentaln := color.Magenta.Println

	magentaln("All options:")
	fmt.Printf("%+v\n", exampleOpts)
	magentaln("Raw args:")
	fmt.Printf("%v\n", args)

	magentaln("Get arg by name:")
	arr := c.Arg("arrArg")
	fmt.Printf("named array arg '%s', value: %v\n", arr.Name, arr.Value)

	magentaln("All named args:")
	for _, arg := range c.Args() {
		fmt.Printf("named arg '%s': %+v\n", arg.Name, *arg)
	}

	return nil
}

• display the command help：

go build ./_examples/cliapp.go && ./cliapp example -h

Progress display

• progress.Bar progress bar

25/50 [==============>-------------]  50%

• progress.Txt text progress bar

Data handling ... ... 50% (25/50)

• progress.LoadBar pending/loading progress bar
• progress.Counter counter
• progress.RoundTrip round trip progress bar

[===     ] -> [    === ] -> [ ===    ]

• progress.DynamicText dynamic text message

Examples:

package main

import "time"
import "github.com/gookit/gcli/progress"

func main()  {
	speed := 100
	maxSteps := 110
	p := progress.Bar(maxSteps)
	p.Start()

	for i := 0; i < maxSteps; i++ {
		time.Sleep(time.Duration(speed) * time.Millisecond)
		p.Advance()
	}

	p.Finish()
}

more demos please see progress_demo.go

run demos:

go run ./_examples/cliapp.go prog txt
go run ./_examples/cliapp.go prog bar
go run ./_examples/cliapp.go prog roundTrip

Interactive methods

console interactive methods

• interact.ReadInput
• interact.ReadLine
• interact.ReadFirst
• interact.Confirm
• interact.Select/Choice
• interact.MultiSelect/Checkbox
• interact.Question/Ask
• interact.ReadPassword

Examples:

package main

import "fmt"
import "github.com/gookit/gcli/interact"

func main() {
	username, _ := interact.ReadLine("Your name?")
	password := interact.ReadPassword("Your password?")
	
	ok := interact.Confirm("ensure continue?")
	if !ok {
		// do something...
	}
    
	fmt.Printf("username: %s, password: %s\n", username, password)
}

CLI Color

Color output display

Usage

package main

import (
    "github.com/gookit/color"
)

func main() {
	// simple usage
	color.Cyan.Printf("Simple to use %s\n", "color")

	// internal theme/style:
	color.Info.Tips("message")
	color.Info.Prompt("message")
	color.Info.Println("message")
	color.Warn.Println("message")
	color.Error.Println("message")
	
	// custom color
	color.New(color.FgWhite, color.BgBlack).Println("custom color style")

	// can also:
	color.Style{color.FgCyan, color.OpBold}.Println("custom color style")
	
	// use defined color tag
	color.Print("use color tag: <suc>he</><comment>llo</>, <cyan>wel</><red>come</>\n")

	// use custom color tag
	color.Print("custom color tag: <fg=yellow;bg=black;op=underscore;>hello, welcome</>\n")

	// set a style tag
	color.Tag("info").Println("info style text")

	// prompt message
	color.Info.Prompt("prompt style message")
	color.Warn.Prompt("prompt style message")

	// tips message
	color.Info.Tips("tips style message")
	color.Warn.Tips("tips style message")
}

More usage

Basic color

support on windows cmd.exe

• color.Bold
• color.Black
• color.White
• color.Gray
• color.Red
• color.Green
• color.Yellow
• color.Blue
• color.Magenta
• color.Cyan

color.Bold.Println("bold message")
color.Yellow.Println("yellow message")

Extra themes

support on windows cmd.exe

• color.Info
• color.Note
• color.Light
• color.Error
• color.Danger
• color.Notice
• color.Success
• color.Comment
• color.Primary
• color.Warning
• color.Question
• color.Secondary

color.Info.Println("Info message")
color.Success.Println("Success message")

Use like html tag

not support on windows cmd.exe

// use style tag
color.Print("<suc>he</><comment>llo</>, <cyan>wel</><red>come</>")
color.Println("<suc>hello</>")
color.Println("<error>hello</>")
color.Println("<warning>hello</>")

// custom color attributes
color.Print("<fg=yellow;bg=black;op=underscore;>hello, welcome</>\n")

For more information on the use of color libraries, please visit gookit/color

Ref

• issue9/term https://github.com/issue9/term
• beego/bee https://github.com/beego/bee
• inhere/console https://github/inhere/php-console
• ANSI escape code

License

MIT