Add completion for require relative

[vinistock]

We currently have completion for regular requires, which search the indexed files based on require paths. We can also provide require_relative completion, which would be a nice improvement.

I think the implementation would be something like this:

• First, refactor the current completion so that we're handling CallNode instead of StringNode

  ruby-lsp/lib/ruby_lsp/requests/completion.rb

  Line 58 in e5a2c89

  def on_string_node_enter(node)

• Then, check if the method call is require and execute the current implementation
• If it's require_relative, then we want to
  • Expand the path given as argument. For example, if we have require_relative "../something/", we need to expand it to the absolute path using Pathname
  • After we have the absolute path, we need to list all Ruby files available that path to provide as completion suggestions. Likely doing something along the lines of Dir.glob("#{absolute_path}/**/*.rb")

[namrata18s]

hi @vinistock , can I work on this issue?

[vinistock]

Of course! Assigning it to you.