Replace unknown local function

[sheldak]

I propose extending code actions by adding suggestions for calling or referencing unknown local functions. For example, the following code:

defmodule Example do
  def main do
    fo()
  end

  def foo do
    42
  end
end

calls non-existing function fo/0. But since there is a similar existing function foo, we can introduce a code action that replaces the above code with:

defmodule Example do
  def main do
    foo() # <-- changed here
  end

  def foo do
    42
  end
end

I used String.jaro_distance/2 with a threshold of 0.77 to create at most 5 suggestions (similar to did you mean functionality).

[sheldak]

@lukaszsamson The feature is finished but I get some CI errors that don't seem to be connected with it. Could you help me with it and/or give some feedback regarding this new code action?

[lukaszsamson]

@sheldak I'll review it shortly

[sheldak]

@lukaszsamson After merging the new master it passes all the tests

[lukaszsamson]

@sheldak #1057 is merged now, would you consider to rework this PR on top of the current master?

[sheldak]

@sheldak #1057 is merged now, would you consider to rework this PR on top of the current master?

Sure, I will definitely go back to that at some point. However, currently, I have other priorities so it may take some time.