Check out ElixirLS: Introducing ElixirLS, the Elixir Language Server
I really like the idea of LanguageServer - and atom is already taking advantage of it. The author of ElixirLS said he is working with Elixir core tem (see the link).
Don’t know the current status, but Elixir 1.6 seems to make this happen, probably with code formatter. I guess both need supports from Elixir compiler.
