main.go

// Copyright © 2018 Brian Shumate <brian@brianshumate.com>
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
//    this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

package main

import (
	"fmt"
	"os"
	"strings"
)

func IsHelp(argument string) bool {
	switch argument {
	case
		"?",
		"/?",
		"h",
		"-h",
		"/h",
		"help",
		"-help",
		"--help":
		return true
	}
	return false
}

func IsProduct(product string) bool {
	switch product {
	case
		"consul",
		"consul-template",
		"envconsul",
		"nomad",
		"packer",
		"sentinel",
		"terraform",
		"vagrant",
		"vault":
		return true
	}
	return false
}

func main() {
	args := os.Args[1:]

	switch len(args) {
	case 0:
		fmt.Println("show info")
		fmt.Println("if nothing installed, show or mention help command")

	case 1:
		if IsHelp(args[0]) {
			fmt.Println("show help")
			os.Exit(0)
		}

		if IsProduct(args[0]) {
			fmt.Println(fmt.Sprintf("install and switch to latest %s", args[0]))
		} else {
			fmt.Println(fmt.Sprintf("invalid product: %s", args[0]))
			os.Exit(1)
		}

	case 2:
		if IsHelp(args[0]) {
			fmt.Println("show help")
			os.Exit(1)
		}

		if IsProduct(args[0]) {
			if strings.HasPrefix(args[1], "-") {
				fmt.Println(fmt.Sprintf("uninstall %s version %s", args[0], args[1]))
			} else {
				fmt.Println(fmt.Sprintf("install and switch to %s version %s", args[0], args[1]))
			}
		} else {
			fmt.Println(fmt.Sprintf("invalid product: %s", args[0]))
			os.Exit(1)
		}

	default:
		fmt.Println("show usage")
		os.Exit(1)
	}
}