packer fmt: support formatting multiple named templates

[tomeon]

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Description

This is a request for supporting multiple template and/or directory arguments to packer fmt, rather than the current limitation to a single template (or directory, or stdin). Basically hashicorp/terraform#28191, but for Packer. Related: numtide/treefmt-nix#169.

Use Case(s)

1. Support for/compliance with the treefmt formatter specification, and
2. Greater user control over the precise set of files-to-be-formatted.

Potential configuration

$ packer fmt this.pkr.hcl yet/another.pkrvars.hcl but/wait/theres/more.pkr.hcl

Potential References

• command/fmt: support formatting multiple files terraform#28191
• Add packer fmt formatter numtide/treefmt-nix#169

Thank you in advance for your consideration!

[nywilken]

@tomeon thanks for opening up this request. This looks like a nice enhancement for the fmt command. Thanks for bubbling this up.