Go version of https://gist.github.com/anonymous/4ea6a6c8762188d2031d9a229fe77389

yamlworlds.go

package main

import (
	"flag"
	"fmt"
	"io/ioutil"
	"os"

	"gopkg.in/yaml.v2"
)

// Place worlds.yml in the same directory as this file.
//
// A Go version of https://gist.github.com/anonymous/4ea6a6c8762188d2031d9a229fe77389
func main() {
	name := flag.String("name", "", "Name of world to export from worlds.yml")
	flag.Parse()

	if *name == "" {
		flag.Usage()
		os.Exit(1)
	}

	body, err := ioutil.ReadFile("worlds.yml")
	if err != nil {
		panic(err)
	}

	// unmarshal the file body into the map
	var data map[string]map[string]interface{}
	if err = yaml.Unmarshal(body, &data); err != nil {
		panic(err)
	}

	// get the world we want
	y, err := yaml.Marshal(data["worlds"][*name])

	if err != nil {
		panic(err)
	}

	// check for missing world
	if len(y) < 6 {
		fmt.Printf("404 world not found : %v\n", *name)
		os.Exit(1)
	}

	// write the world out to a yaml file
	filename := fmt.Sprintf("%v.yml", *name)
	ioutil.WriteFile(filename, y, 0600)
}