main.go

package main

import (
	"log"

	"github.com/hashicorp/hcl"
	"github.com/k0kubun/pp"
)

type Config struct {
	Hoge Hoge `hcl:"hoge"`
}

type Hoge struct {
	Fuga int    `hcl:"fuga"`
	Piyo string `hcl:"piyo"`
}

func parse(input string) {
	var result Config
	obj, err := hcl.Parse(input)
	if err != nil {
		log.Fatal(err)
	}
	if err := hcl.DecodeObject(&result, obj); err != nil {
		log.Fatal(err)
	}
	pp.Println(result)
}

func main() {
	parse(`
		hoge {
			fuga = 1
			piyo = "baz"
		}
	`)
	parse(`
		hoge {
			fuga = "bar" /* wrong */
			piyo = "baz"
		}
	`)
}

$ go run main.go

main.Config{
  Hoge: main.Hoge{
    Fuga: 1,
    Piyo: "baz",
  },
}
2015/11/02 19:30:52 strconv.ParseInt: parsing "bar": invalid syntax
exit status 1