Is there any way to separate terraform's expression into multiple lines?

Question

I want to know the way to separate terraform expressions into multiple lines because they're sometimes too long if in 1 line.

• terraform's version I use

$ terraform version
Terraform v0.14.2

• long expression example : If the bucket name is not specified, create a new bucket name. If specified, use it.

locals {
  bucket_name = var.bucket_name == "" ? "hoge-${formatdate("YYYYMMDDHHmmss", timestamp())}" : var.bucket_name
}

• I want to change the example expression like below

locals {
  bucket_name = var.bucket_name == "" ? \
                "hoge-${formatdate("YYYYMMDDHHmmss", timestamp())}" : \
                 var.bucket_name
}

But this raise an Error: Invalid expression.

Is there any way to separate an expression into multiple lines?

Answer 1

You can just put it in brackets:

locals {
  bucket_name = (var.bucket_name == "" 
              ? "hoge-${formatdate("YYYYMMDDHHmmss", timestamp())}" 
              : var.bucket_name)
}