bench_phoenix_mjml.exs

mjml_path = "samples/try_it_live.html.mjml"

file_read = fn ->
  mjml_path
    |> Path.basename   # generate_html_path -> generate_mjml_path
    |> Path.rootname   # generate_mjml_path
    |> fn file_name -> "tmp/#{UUID.uuid1}-#{file_name}" end.()  # generate_mjml_path
    |> Path.absname # generate_html_path
    |> fn path -> # generate_html_path -> convert_into_html
      File.mkdir("tmp") # convert_into_html
      System.cmd("mjml", [mjml_path, "-o", path]) # convert_into_html
      path # convert_into_html
    end.()
    |> fn path -> {File.read!(path), path} end.()
    |> fn {bytes, path} -> File.rm!(path) && bytes end.()
    |> EEx.compile_string(engine: Phoenix.HTML.Engine, line: 0, trim: true)
end

stdout_read = fn ->
  {html, 0} = System.cmd("mjml", [mjml_path, "-s"])
  html
    |> EEx.compile_string(engine: Phoenix.HTML.Engine, line: 0, trim: true)
end

if file_read.() !=  stdout_read.() do
  IO.puts "Both implementations differ"
  System.halt(1)
end

%{
  "file_read" => file_read,
  "stdout_read" => stdout_read
}
|> Benchee.run time: 60