`terraform fmt` does not handle `.tfmock.hcl` files

[HenriBlacksmith]

Terraform Version

Terraform v1.7.1

Use Cases

When using the Terraform 1.7 mocks feature as suggested in the official tutorial: https://developer.hashicorp.com/terraform/language/tests/mocking#mock-provider-data

Terraform formatting does not apply to the .tfmock.hcl files

terraform fmt tests/aws/data.tfmock.hcl
╷
│ Error: Only .tf, .tfvars, and .tftest.hcl files can be processed with terraform fmt
│ 
│ 
╵

Attempted Solutions

Renaming the file with .tftest.hcl extension before formatting is a workaround to get it formatted with:
terraform fmt tests/aws/data.tftest.hcl

Proposal

Extending fmt subcommand to .tfmock.hcl files

References

No response

[liamcervante]

Thanks @HenriBlacksmith, this seems perfectly reasonable to me. It should be a fairly easy fix, we just need to add the new extension to https://github.com/hashicorp/terraform/blob/main/internal/command/fmt.go#L31-L34 and add some test cases.

We can launch this in the next minor release. I'll get around to implementing eventually, but will happily review any PRs from willing contributors before then!

[HenriBlacksmith]

@liamcervante will see if I can give it a try, except if anyone is faster (suits me too).

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