elixir

Elixir: Resume code execution after reaching IEx.pry


In ruby Ctrl - d allows to resume the execution of the code after reaching a binding.pry. What is the equivalent in Elixir for IEx.pry ?


Solution

  • As documented in IEx.pry/0, you can call respawn to resume the execution.

    This is useful for debugging a particular chunk of code when executed by a particular process. The process becomes the evaluator of IEx commands and is temporarily changed to have a custom group leader. Those values are reverted by calling IEx.Helpers.respawn/0, which starts a new IEx shell, freeing up the pried one.

    iex(1)> defmodule A do
    ...(1)>   require IEx
    ...(1)>   def a do
    ...(1)>     a = 1
    ...(1)>     b = 2
    ...(1)>     IEx.pry
    ...(1)>     IO.puts a + b
    ...(1)>   end
    ...(1)> end
    {:module, A,
     <<70, 79, 82, 49, 0, 0, 12, 144, 66, 69, 65, 77, 65, 116, 85, 56, 0, 0, 0, 110,
       0, 0, 0, 12, 8, 69, 108, 105, 120, 105, 114, 46, 65, 8, 95, 95, 105, 110,
       102, 111, 95, 95, 9, 102, 117, 110, 99, ...>>, {:a, 0}}
    iex(2)> A.a
    Break reached: A.a/0 (iex:6)
    pry(1)> a
    1
    pry(2)> b
    2
    pry(3)> respawn
    
    Interactive Elixir (1.5.1) - press Ctrl+C to exit (type h() ENTER for help)
    3
    :ok