Add support for the output command

[david-obee]

Description

This PR adds support for the terraform output command, detailed in https://www.terraform.io/docs/commands/output.html.

Related Issue

#40

Motivation and Context

This is a useful command that has been missing. While similar results are achievable by interpreting the output of the terraform show command, this is much more straight forward to use if you only need output values.

How Has This Been Tested?

Covered the code with unit tests, as per the style of those for the other commands. All command line arguments used are tested.

This has been tested in a project Cake pipeline. A Terraform environment is created, after which we access two outputs using this new command.

Screenshots (if appropriate):

Not applicable.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[megakid]

Looks good to me

[reda-chakkour]

@david-obee @megakid Any reason this never landed?

[david-obee]

Hi @reda-chakkour, I'm not sure unfortunately, I don't have write access to the repo, so it needs one of the maintainers to approve and merge it

[nils-a]

LGTM!

[nils-a]

@david-obee your changes have been merged, thanks for your contribution 👍