cli

// main.go
// This is a HelloWorld-like example

package main

import (
	"os"

	"github.com/mkideal/cli"
)

type argT struct {
	Name string `cli:"name" usage:"tell me your name"`
}

func main() {
	os.Exit(cli.Run(new(argT), func(ctx *cli.Context) error {
		argv := ctx.Argv().(*argT)
		ctx.String("Hello, %s!\n", argv.Name)
		return nil
	}))
}

$ go build -o hello
$ ./hello --name Clipher
Hello, Clipher!

// main.go
// This example show basic usage of flag

package main

import (
	"os"

	"github.com/mkideal/cli"
)

type argT struct {
	cli.Helper
	Port int  `cli:"p,port" usage:"short and long format flags both are supported"`
	X    bool `cli:"x" usage:"boolean type"`
	Y    bool `cli:"y" usage:"boolean type, too"`
}

func main() {
	os.Exit(cli.Run(new(argT), func(ctx *cli.Context) error {
		argv := ctx.Argv().(*argT)
		ctx.String("port=%d, x=%v, y=%v\n", argv.Port, argv.X, argv.Y)
		return nil
	}))
}

$ go build -o app
$ ./app -h
Options:

  -h, --help     display help information
  -p, --port     short and long format flags both are supported
  -x             boolean type
  -y             boolean type, too
$ ./app -p=8080 -x
port=8080, x=true, y=false
$ ./app -p 8080 -x=true
port=8080, x=true, y=false
$ ./app -p8080 -y true
port=8080, x=false, y=true
$ ./app --port=8080 -xy
port=8080, x=true, y=true
$ ./app --port 8080 -yx
port=8080, x=true, y=true

// main.go
// This example show how to use required flag

package main

import (
	"os"

	"github.com/mkideal/cli"
)

type argT struct {
	cli.Helper
	Id uint8 `cli:"*id" usage:"this is a required flag, note the *"`
}

func main() {
	os.Exit(cli.Run(new(argT), func(ctx *cli.Context) error {
		argv := ctx.Argv().(*argT)
		ctx.String("%d\n", argv.Id)
		return nil
	}))
}

$ go build -o app
$ ./app
ERR! required argument --id missing
$ ./app --id=2
2

…

$ go build -o app
$ ./app -h
Options:

  -h, --help                       display help information
      --basic[=2]                  basic usage of default
      --env[=$HOME]                env variable as default
      --expr[=$BASE_PORT+1000]     expression as default
      --devdir[=$HOME/dev]         directory of developer
$ ./app
2, /Users/wang, 1000, /Users/wang/dev
$ BASE_PORT=8000 ./app --basic=3
3, /Users/wang, 9000, /Users/wang/dev

// main.go
// This example show how to use slice as a flag

package main

import (
	"os"

	"github.com/mkideal/cli"
)

type argT struct {
	// []bool, []int, []float32, ... supported too.
	Friends []string `cli:"F" usage:"my friends"`
}

func main() {
	os.Exit(cli.Run(new(argT), func(ctx *cli.Context) error {
		ctx.JSONln(ctx.Argv())
		return nil
	}))
}

$ go build -o app
$ ./app
{"Friends":null}
$ ./app -FAlice -FBob -F Charlie
{"Friends":["Alice","Bob","Charlie"]}

// main.go
// This example show how to use map as a flag

package main

import (
	"os"

	"github.com/mkideal/cli"
)

type argT struct {
	Macros map[string]int `cli:"D" usage:"define macros"`
}

func main() {
	os.Exit(cli.Run(new(argT), func(ctx *cli.Context) error {
		ctx.JSONln(ctx.Argv())
		return nil
	}))
}

$ go build -o app
$ ./app
{"Macros":null}
$ ./app -Dx=not-a-number
ERR! `not-a-number` couldn't converted to an int value
$ ./app -Dx=1 -D y=2
{"Macros":{"x":1,"y":2}}

// main.go
// This example show usage of force flag
// Force flag has prefix !, and must be a boolean.
// Will prevent validating flags if some force flag assigned true

package main

import (
	"os"

	"github.com/mkideal/cli"
)

type argT struct {
	Version  bool `cli:"!v" usage:"force flag, note the !"`
	Required int  `cli:"*r" usage:"required flag"`
}

func main() {
	os.Exit(cli.Run(new(argT), func(ctx *cli.Context) error {
		argv := ctx.Argv().(*argT)
		if argv.Version {
			ctx.String("v0.0.1\n")
		}
		return nil
	}))
}

$ go build -o app
$ ./app
ERR! required argument -r missing

# -v is a force flag, and assigned true, so `ERR` disappear.
$ ./app -v
v0.0.1

…

…

// main.go
// This example demonstrates cli.AutoHelper

package main

import (
	"os"

	"github.com/mkideal/cli"
)

type argT struct {
	Help bool `cli:"h,help" usage:"show help"`
}

// AutoHelp implements cli.AutoHelper interface
// NOTE: cli.Helper is a predefined type which implements cli.AutoHelper
func (argv *argT) AutoHelp() bool {
	return argv.Help
}

func main() {
	os.Exit(cli.Run(new(argT), func(ctx *cli.Context) error {
		return nil
	}))
}

$ go build -o app
$ ./app -h
Options:

  -h, --help     show help

…

$ go build -o app
$ ./app --age=-1
ERR! age -1 out of range
$ ./app --age=1000
ERR! age 1000 out of range
$ ./app -g balabala
ERR! invalid gender balabala
$ ./app --age 88 --gender female
{"Help":false,"Age":88,"Gender":"female"}

// main.go
// This example introduce prompt and pw tag

package main

import (
	"os"

	"github.com/mkideal/cli"
)

type argT struct {
	cli.Helper
	Username string `cli:"u,username" usage:"github account" prompt:"type github account"`
	Password string `pw:"p,password" usage:"password of github account" prompt:"type the password"`
}

func main() {
	os.Exit(cli.Run(new(argT), func(ctx *cli.Context) error {
		argv := ctx.Argv().(*argT)
		ctx.String("username=%s, password=%s\n", argv.Username, argv.Password)
		return nil
	}))
}

$ go build -o app
$ ./app
type github account: hahaha # visible
type the password: # invisible because of `pw` tag
username=hahaha, password=123456

// main.go
// This example show how to use decoder

package main

import (
	"os"
	"strings"

	"github.com/mkideal/cli"
)

type exampleDecoder struct {
	list []string
}

// Decode implements cli.Decoder interface
func (d *exampleDecoder) Decode(s string) error {
	d.list = strings.Split(s, ",")
	return nil
}

type argT struct {
	Example exampleDecoder `cli:"d" usage:"example decoder"`
}

func main() {
	os.Exit(cli.Run(new(argT), func(ctx *cli.Context) error {
		argv := ctx.Argv().(*argT)
		ctx.JSONln(argv.Example.list)
		return nil
	}))
}

$ go build -o app
$ ./app -d a,b,c
["a","b","c"]

// main.go
// This example show how to use builtin Decoder: PidFile

package main

import (
	"os"

	"github.com/mkideal/cli"
	clix "github.com/mkideal/cli/ext"
)

type argT struct {
	cli.Helper
	PidFile clix.PidFile `cli:"pid" usage:"pid file" dft:"013-pidfile.pid"`
}

func main() {
	os.Exit(cli.Run(new(argT), func(ctx *cli.Context) error {
		argv := ctx.Argv().(*argT)

		if err := argv.PidFile.New(); err != nil {
			return err
		}
		defer argv.PidFile.Remove()

		return nil
	}))
}

// main.go
// This example show how to use builtin Decoder: Time and Duration

package main

import (
	"os"

	"github.com/mkideal/cli"
	clix "github.com/mkideal/cli/ext"
)

type argT struct {
	Time     clix.Time     `cli:"t" usage:"time"`
	Duration clix.Duration `cli:"d" usage:"duration"`
}

func main() {
	os.Exit(cli.Run(new(argT), func(ctx *cli.Context) error {
		argv := ctx.Argv().(*argT)
		ctx.String("time=%v, duration=%v\n", argv.Time, argv.Duration)
		return nil
	}))
}

$ go build -o app
$ ./app -t '2016-1-2 3:5' -d=10ms
time=2016-01-02 03:05:00 +0800 CST, duration=10ms

// main.go
// This example show how to use builtin Decoder: File

package main

import (
	"os"

	"github.com/mkideal/cli"
	clix "github.com/mkideal/cli/ext"
)

type argT struct {
	Content clix.File `cli:"f,file" usage:"read content from file or stdin"`
}

func main() {
	os.Exit(cli.Run(new(argT), func(ctx *cli.Context) error {
		argv := ctx.Argv().(*argT)
		ctx.String(argv.Content.String())
		return nil
	}))
}

$ go build -o app
# read from stdin
$ echo hello | ./app -f
hello
# read from file
$ echo hello > test.txt && ./app -f test.txt
hello
$ rm test.txt

…

$ go build -o app
$ ./app
{
    "A": "",
    "B": 0,
    "C": false
}
$ ./app -c '{"A": "hello", "b": 22, "C": true}'
{
    "A": "hello",
    "B": 22,
    "C": true
}

// main.go
// This example show how to use builtin parser: jsonfile
// It's similar to json, but read string from file.

package main

import (
	"os"

	"github.com/mkideal/cli"
)

type config struct {
	A string
	B int
	C bool
}

typ