HCL v2 Write Custom Traversal

issue.url

https://github.com/hashicorp/hcl/issues/696

main.go

package main

import (
	"fmt"

	"github.com/hashicorp/hcl/v2"
	"github.com/hashicorp/hcl/v2/hclsyntax"
	"github.com/hashicorp/hcl/v2/hclwrite"
)

func main() {
	file := hclwrite.NewEmptyFile()
	body := file.Body()

	dataBody := hclwrite.NewEmptyFile().Body()

	dataBody.SetAttributeTraversal("config.hcl", hcl.Traversal{
		hcl.TraverseRoot{Name: "data"},
		hcl.TraverseAttr{Name: "template_file"},
		hcl.TraverseAttr{Name: "vault_config"},
		hcl.TraverseAttr{Name: "rendered"},
	})

	dataTokens := dataBody.BuildTokens(nil)

	dataAttrTokens := hclwrite.Tokens{
		&hclwrite.Token{
			Type:  hclsyntax.TokenEqual,
			Bytes: nil,
		},
		&hclwrite.Token{
			Type:  hclsyntax.TokenOBrace,
			Bytes: []byte("{\n"),
		},
	}
	dataAttrTokens = append(dataAttrTokens, dataTokens...)
	dataAttrTokens = append(dataAttrTokens, &hclwrite.Token{
		Type:  hclsyntax.TokenCBrace,
		Bytes: []byte("}"),
	})

	body.SetAttributeRaw("data", dataAttrTokens)

	hclwrite.Format(file.Bytes())

	fmt.Printf("%s", hclwrite.Format(file.Bytes()))
}

output.hcl

data = {
  config.hcl = data.template_file.vault_config.rendered
}