Walk hierarchy asynchronously

[radeksimko]

Current Version

v0.4.0

Use-cases

Currently the whole hierarchy is walked through to discover root modules on initialization synchronously:

terraform-ls/langserver/handlers/initialize.go

Lines 58 to 66 in e40f7c5

	walker := rootmodule.NewWalker()
	walker.SetLogger(lh.logger)
	err = walker.WalkInitializedRootModules(fh.Dir(), func(dir string) error {
	lh.logger.Printf("Adding root module (via %T): %s", rmm, dir)
	return rmm.AddRootModule(dir)
	})
	if err != nil {
	return serverCaps, err
	}

This can result in:

1. delay in adding paths to the watcher
2. delayed initial response to the client, which means the client may refuse to provide any functionality until initialize request is responded to

Proposal

Run walker asynchronously.

It should still be cancellable per session though.

[ghost]

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