Update HCL/Terraform grammar to hashicorp/syntax

[dbanck]

Description

This PR replaces the grammar for highlighting .hcl, .nomad, .workflow and Terraform (.tf, .tfvars) files with an updated one.

We started maintaining HCL based grammars in hashicorp/syntax about 2 years ago and have fixed many edge cases since then. This grammar is also used in the vscode-hcl extension.

Another reason for this update proposal is, that Terraform 1.8 shipped with provider-defined functions. These are enabled by a :: namespace syntax in HCL that isn't supported by the old grammar. The new grammar streamlines the highlighting for functions.

I ran script/add-grammar --replace Terraform.tmLanguage https://github.com/hashicorp/syntax to generate most of the changes. The repository is already present as a submodule and was added in #6604.

Let me know if I missed anything 🙂

Checklist

• I am changing the source of a syntax highlighting grammar
  • Old: https://github.com/alexlouden/Terraform.tmLanguage
  • New: https://github.com/hashicorp/syntax

UX Changes (GithHub Dark Default)

Generic configuration

Before

After

Some edge case examples

Conditionals & Comments

Before

After

Function Calls

Before

After

Block Labels

Before

After

Happy to look into differences/bugs if you find any with the new grammar.

[lildude]

LGTM. Thanks.

Note: this PR will not be merged until close to when the next release is made. See here for more details.