main.go

package main

import (
	"fmt"
	"github.com/urfave/cli"
	"github.com/y13i/j2y/lib"
	"golang.org/x/crypto/ssh/terminal"
	"os"
)

func main() {
	app := cli.NewApp()

	app.Name    = "j2y"
	app.Usage   = "convert JSON to YAML"
	app.Version = "0.0.8"

	app.Flags = []cli.Flag{
		cli.StringFlag{
			Name:  "output, o",
			Value: "STDOUT",
			Usage: "path of output destination file path",
		},

		cli.BoolFlag{
			Name:  "eval, e",
			Usage: "treat argument as raw data instead of file path",
		},

		cli.BoolFlag{
			Name:  "reverse, r",
			Usage: "convert YAML to JSON",
		},

		cli.BoolFlag{
			Name:  "minify, m",
			Usage: "output JSON in single line format",
		},
	}

	app.Action = func(command *cli.Context) error {
		var source      string
		var outputBytes []byte

		if terminal.IsTerminal(0) {
			if command.Bool("eval") {
				source = "ARGV"
			} else {
				if command.Args().First() == "" {
					fmt.Println("`j2y --help` to view usage.")
					os.Exit(1)
				}

				source = "FILE"
			}
		} else {
			source = "STDIN"
		}

		inputBytes := j2yLib.GetInputBytes(source, command.Args().First())

		if command.Bool("reverse") {
			outputBytes = j2yLib.YamlToJson(inputBytes, command.Bool("minify"))
		} else {
			outputBytes = j2yLib.JsonToYaml(inputBytes)
		}

		j2yLib.Output(outputBytes, command.String("output"))

		return nil
	}

	app.Run(os.Args)
}