Question - Write Remain

[chriskolenko]

I'm trying to dynamically create some HCL files from golang.

I'm trying to write the following objects

type Modules struct {
	Modules []*Module `hcl:"module,block"`
}

type Module struct {
	Name    string      `hcl:"name,label"`
	Source  string      `hcl:"source"`
	Options interface{} `hcl:",remain"`
}

Using the follow, I'm not able to generate the remaining attributes

func Encode(val interface{}) []byte {
	f := hclwrite.NewEmptyFile()
	gohcl.EncodeIntoBody(val, f.Body())
	return f.Bytes()
}

##Output

module "bar" {
  source = "./bar"
}

##Expected

module "bar" {
  source = "./bar"
  
  foo = "bar"
  bar = ["foo", "bar"]
}

[apparentlymart]

Hi @chriskolenko,

Indeed, this is a known assymetry in hclwrite vs. the normal decoding API, and it is because the hcl.Body API is designed for schema-driven decoding and doesn't have enough information on it's own to determine what is a suitable native syntax representation of a body.

To meet this use-case you will need to drop down to the lower-level API in the hclwrite package and manipulate the body syntax tree directly, or to write a more specific struct type which enumerates exactly which attributes you want to include so gohcl can know what schema to use to encode this data.