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assert_value

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ExUnit's assert on steroids that writes and updates tests for you

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assert_value lib assert_value diff.ex
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lib/assert_value/diff.ex 

defmodule AssertValue.Diff do



  @prefixes %{eq: " ", ins: "+", del: "-"}



  def diff(a, b) when is_binary(a) and is_binary(b) do

    a = AssertValue.StringTools.to_lines(a)

    b = AssertValue.StringTools.to_lines(b)

    List.myers_difference(a, b)

    |> format_diff

  end



  defp format_diff(diff) do

    diff

    |> Enum.map(fn({k, v}) ->

        Enum.map(v, fn(s) ->

          @prefixes[k] <> s

        end)

      end)

    |> List.flatten

    |> Enum.join("\n")

    |> Kernel.<>("\n")

  end



end