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rewire

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Dependency injection for Elixir. Zero code changes required.

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rewire lib rewire block.ex
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lib/rewire/block.ex 

defmodule Rewire.Block do

  @moduledoc false



  def rewire_block(

        opts = %{

          module_shorthand: module_shorthand,

          new_module_ast: new_module_ast

        },

        block

      ) do

    quote do

      # First, we generate the rewired module.

      unquote(Rewire.Module.rewire_module(opts))



      # Then, we replace all references to the original module with our rewired one.

      unquote(rewire_test_block(block, module_shorthand, new_module_ast))

    end

  end



  defp rewire_test_block(block, module_shorthand, new_module_ast) do

    Macro.prewalk(block, fn

      {:__aliases__, meta, [^module_shorthand]} ->

        {:__aliases__, meta, new_module_ast}



      expr ->

        expr

    end)

  end

end