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snakebridge

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Compile-time generator for type-safe Elixir bindings to Python libraries

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snakebridge lib snakebridge python_runner system.ex
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lib/snakebridge/python_runner/system.ex 

defmodule SnakeBridge.PythonRunner.System do

  @moduledoc false



  @behaviour SnakeBridge.PythonRunner



  @impl SnakeBridge.PythonRunner

  def run(script, args, opts \\ []) when is_binary(script) and is_list(args) do

    with {:ok, python, _meta} <- Snakepit.PythonRuntime.resolve_executable() do

      env = build_env(opts)

      cmd_opts = Keyword.merge([stderr_to_stdout: true, env: env], Keyword.drop(opts, [:env]))



      case System.cmd(python, ["-c", script | args], cmd_opts) do

        {output, 0} -> {:ok, output}

        {output, status} -> {:error, {:python_exit, status, output}}

      end

    end

  end



  defp build_env(opts) do

    runtime_env = Snakepit.PythonRuntime.runtime_env()



    extra_env =

      Snakepit.PythonRuntime.config()

      |> Map.get(:extra_env, %{})

      |> Enum.to_list()



    user_env =

      opts

      |> Keyword.get(:env, %{})

      |> Enum.to_list()



    runtime_env ++ extra_env ++ user_env

  end

end