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protox

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A fast, easy to use and 100% conformant Elixir library for Google Protocol Buffers (aka protobuf)

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protox lib protox protoc.ex
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lib/protox/protoc.ex 

defmodule Protox.Protoc do



  @moduledoc false



  def run([proto_file]) do

    do_run([proto_file], ["-I", "#{proto_file |> Path.dirname() |> Path.expand()}"])

  end





  def run(proto_files) do

    do_run(proto_files, ["-I", "#{common_directory_path(proto_files)}"])

  end





  # -- Private





  defp do_run(proto_files, args) do

    outfile_name = "protox_#{Protox.Util.random_string()}"

    outfile_path = Path.join([Mix.Project.build_path(), outfile_name])

    cmd_args = ["--include_imports", "-o", outfile_path] ++ args ++ proto_files



    ret = case System.cmd("protoc", cmd_args) do

      {_, 0}   -> {:ok, File.read!(outfile_path)}

      {msg, _} -> {:error, msg}

    end



    :ok = File.rm(outfile_path)



    ret

  end





  defp common_directory_path(paths_rel) do

    paths = Enum.map(paths_rel, &Path.expand/1)



    min_path = paths |> Enum.min() |> Path.split()

    max_path = paths |> Enum.max() |> Path.split()



    min_path

    |> Enum.zip(max_path)

    |> Enum.take_while(fn {a, b} -> a == b end)

    |> Enum.map(fn {x, _} -> x end)

    |> Path.join()

  end



end