Support each.* references in blocks w/ for_each

[radeksimko]

Background

Terraform supports each.key and each.value references within resource, data or module block and anywhere where for_each meta-argument is supported, for example

resource "azurerm_resource_group" "rg" {
  for_each = {
    a_group = "eastus"
    another_group = "westus2"
  }
  name     = each.key
  location = each.value
}

https://www.terraform.io/language/expressions/references#block-local-values
https://www.terraform.io/language/meta-arguments/for_each

We don't provide any kind of support for this type of reference and if we were to do any kind of thorough validation of them we'd probably flag them as invalid today.

Expected UX

Completion

Hover

Semantic Highlighting

Proposal

• hashicorp/hcl-lang
  • Introduce BodyExtensions{ForEach bool} into schema.BodySchema
  • Reflect ForEach in decoder.PathDecoder.CandidatesAtPos()
  • Reflect ForEach in decoder.PathDecoder.HoverAtPos()
  • Reflect ForEach in decoder.PathDecoder.SemanticTokensInFile()
  • Reflect ForEach in decoder.Decoder.Symbols()
• hashicorp/terraform-schema
  • Replace for_each attribute with BodyExtensions{ForEach: true} in resource, data and module block bodies
• hashicorp/terraform-ls
  • bump terraform-schema & hcl-lang

[github-actions]

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