workspace command: extract an expression to a function

[NJichev]

A workspace command that extracts a selected expression to a private function:

Example:

defmodule Example do
  def run() do
    n = 2
    |m = n + 2
    # Calculate
    k = m + n|
    g = 3
  end
end

Selecting the specified region between the pipes should result in:

defmodule Example do
  def run(list) do
    n = 2
    fun(n)
    g = 3
  end

  defp fun(n) do
    m = n + 2
    # Calculate
    k = m + n
  end
end

Consider the following scenarios:

• Any unbound variables in this expression should become extra arguments to the function and be passed from the caller