tm_hcl_expression Function

This function receives a string as a parameter and returns the string contents as an expression. It is particularly useful to circumvent some limitations on HCL and Terraform when building complex expressions from dynamic data.

Since this function produces an expression, not a final evaluated value, it is only allowed to be used in contexts where partial evaluation is allowed, which currently is only the generate_hcl.content block.

The function signature is:

tm_hcl_expression(string) -> expr

Examples

To use tm_hcl_expression, let's say we have a global named data defined like this:

globals {
  data = "data"
}

You can use this global to build a complex expression when generation code, like this:

generate_hcl "test.hcl" {
  content {
    expr = tm_hcl_expression("data.google_active_folder._parent_id.id.${global.data}")
  }
}

Which will generate:

expr = data.google_active_folder._parent_id.id.data