commander

go-commander

The solution for Go command-line interfaces, drive by <docopt>, inspired by <commander.js>

Features

• Has all the features of docopt.
• Usage like commander.js as simple and readable.
• Automatic generated a help message, see documents of docopt.
• Automatically execute the correct action function, don't worry about conflict.
• Can customize the action function, better with context.

Installation

To install commander according to your $GOPATH:

go get github.com/WindomZ/go-commander

To use commander in your Go code:

import "github.com/WindomZ/go-commander"

Examples

Quick example

Such as the following help message

Usage:
  quick_example tcp <host> <port> [--timeout=<seconds>]
  quick_example serial <port> [--baud=9600] [--timeout=<seconds>]
  quick_example -h|--help
  quick_example -v|--version

Options:
  -h --help     show help message
  -v --version  show version

To coding with go-commander just like this:

import "github.com/WindomZ/go-commander"
...

// quick_example
commander.Program.
	Command("quick_example").
	Version("0.1.1rc")

// quick_example tcp <host> <port> [--timeout=<seconds>]
commander.Program.
	Command("tcp <host> <port>").
	Option("--timeout=<seconds>").
	Action(func() {
		fmt.Printf("tcp %s %s %s\n",
			commander.Program.MustString("<host>"),
			commander.Program.MustString("<port>"),
			commander.Program.MustString("--timeout"),
		)
	})

// quick_example serial <port> [--baud=9600] [--timeout=<seconds>]
commander.Program.
	Command("serial <port>").
	Option("--baud=9600").
	Option("--timeout=<seconds>").
	Action(func() {
		fmt.Printf("serial %s %s %s\n",
			commander.Program.MustString("<port>"),
			commander.Program.MustString("--baud"),
			commander.Program.MustString("--timeout"),
		)
	})

commander.Program.Parse()

Get the terminal output:

$ quick_example --version
# output: 0.1.1rc

$ quick_example tcp 127.0.0.1 1080 --timeout=110
# output: tcp 127.0.0.1 1080 110

$ quick_example serial 80 --baud=5800 --timeout=120
# output: serial 80 5800 120

Counted example

Such as the following help message

Usage:
  counted_example -v...
  counted_example go [go]
  counted_example (--path=<path>)...
  counted_example <file> <file>
  counted_example -h|--help
  counted_example -v|--version

Options:
  -h --help     show help message
  -v --version  show version

To coding with go-commander just like this:

import "github.com/WindomZ/go-commander"
...

// counted_example -v...
commander.Program.
	Command("counted_example").
	Option("-v...", "", func(c commander.Context) {
		fmt.Println("-v =", c.Get("-v"))
	})

// counted_example go [go]
commander.Program.
	Command("go [go]").
	Action(func(c commander.Context) {
		fmt.Println("go =", c.Get("go"))
	})

// counted_example (--path=<path>)...
commander.Program.
	Command("(--path=<path>)...", "", func(c commander.Context) {
		fmt.Printf("--path = %q\n",
			c.MustStrings("--path"))
	})

// counted_example <file> <file>
commander.Program.
	Command("<file> <file>", "", func(c commander.Context) {
		fmt.Printf("<file> = %q\n",
			c.MustStrings("<file>"))
	})

commander.Program.Parse()

Get the terminal output:

$ counted_example -vvvvvvvvvv
# output: -v = 10

$ counted_example go go
# output: go = 2

$ counted_example --path ./here --path ./there
# output: --path = ["./here" "./there"]

$ counted_example this.txt that.txt
# output: <file> = ["this.txt" "that.txt"]

Calculator example

Such as the following help message

simple calculator example

Usage:
  calculator_example <value> ( ( + | - | * | / ) <value> )...
  calculator_example <function> <value> [( , <value> )]...
  calculator_example -h|--help
  calculator_example -v|--version

Options:
  -h --help     show help message
  -v --version  show version

Examples:
  calculator_example 1 + 2 + 3 + 4 + 5
  calculator_example 1 + 2 '*' 3 / 4 - 5    # note quotes around '*'
  calculator_example sum 10 , 20 , 30 , 40

To coding with go-commander just like this:

import . "github.com/WindomZ/go-commander"
...

// calculator_example
Program.Command("calculator_example").
	Version("0.0.1").
	Description("Simple calculator example")

// calculator_example <value> ( ( + | - | * | / ) <value> )...
Program.Command("<value> ( ( + | - | * | / ) <value> )...", "", func() {
	var result int
	values := Program.MustStrings("<value>")
	for index, value := range values {
		if i, err := strconv.Atoi(value); err != nil {
		} else if index == 0 {
			result = i
		} else {
			switch Program.GetArg(index*2 - 1) {
			case "+":
				result += i
			case "-":
				result -= i
			case "*":
				result *= i
			case "/":
				result /= i
			}
		}
	}
	fmt.Println(Program.ArgsString(), "=", result)
})

// calculator_example <function> <value> [( , <value> )]...
Program.Command("<function> <value> [( , <value> )]...", "", func() {
	var result int
	switch Program.MustString("<function>") {
	case "sum":
		values := Program.MustStrings("<value>")
		for _, value := range values {
			if i, err := strconv.Atoi(value); err == nil {
				result += i
			}
		}
	}
	fmt.Println(Program.ArgsString(), "=", result)
})

// Examples: ...
Program.Annotation("Examples",
	[]string{
		"calculator_example 1 + 2 + 3 + 4 + 5",
		"calculator_example 1 + 2 '*' 3 / 4 - 5    # note quotes around '*'",
		"calculator_example sum 10 , 20 , 30 , 40",
	},
)

commander.Program.Parse()

Get the terminal output:

$ calculator_example 1 + 2 + 3 + 4 + 5
# output: 15

$ calculator_example 1 + 2 '*' 3 / 4 - 5
# output: -3

$ calculator_example sum 10 , 20 , 30 , 40
# output: 100

License

The MIT License