Display Terraform path, version and constraint in the status bar

[radeksimko]

Problem Statement

Users don't always use a single Terraform version when they manage multiple codebases. Many of them upgrade when it's convenient or necessary.

Users would therefore benefit from knowing the requirements of the module they're working with and the Terraform that was discovered as installed (and would be used for fmt or validate).

Expected User Experience

Proposal

• Introduce module.terraform command to expose details about Terraform installation terraform-ls#995
• Extension to run that custom command to obtain TF version & constraint after change

Outstanding questions

• How to keep TF version up to date on LS side - see Detect and re-load terraform version & path change terraform-ls#69
• See also client/executeCommand microsoft/language-server-protocol#1119 which would likely help updating the UI from server-side, instead of client constantly asking on every change

We could ship an MVP which only displays the constraint as that would only change with configuration change.

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.