Completion of module source and version

[radeksimko]

Problem Statement

Module sources are not always easy to get right and often times these are copy-pasted, or typed manually (which increases the risk of typos). Either way the user would benefit from some extra help there.

module "example" {
  source = # HERE
}

Relatedly users would benefit from being able to pick a version from a list, instead of typing it in.

Expected User Experience

source

• User will be provided with any known/tracked local modules (i.e. local file paths)
• User will be provided with any matching module sources from the Registry
• Required inputs will be pre-filled, if the feature is enabled

Screen.Recording.2022-04-22.at.11.52.58.mov

version

User will be provided with a list of published versions for a given Terraform Registry-published module.

Screen.Recording.2022-04-22.at.11.53.45.mov

Typing will filter versions and versions will be sorted with the latest ones on top (unlike in the recorded demo).

Proposal

hashicorp/terraform-ls#869

Implementation Notes

LSP autocompletion part of the spec uses isIncomplete which we should probably use for the dynamic results from the API
https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_completion

for speed clients should be able to filter an already received completion list if the user continues typing. Servers can opt out of this using a CompletionList and mark it as isIncomplete.

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