An Elixir sigil for executing terminal commands similar to Ruby.

ExecuteSigil.ex

defmodule ExecuteSigil do

  @doc """
  Handles the sigil %x. Takes the given command line string, unescapes the necessary 
  characters and replaces interpolations, executes it, and returns the 
  results as a string. 
  
  ## Examples
  
      iex> %x"echo Hello \x45\x6c\x69\x78\x69\x72\x21"
      "Hello Elixir!\n"
      
  """
  defmacro sigil_x({ :<<>>, _line, [string] }, []) when is_binary(string) do
    string
      |> Macro.unescape_string()
      |> System.cmd()
  end

  defmacro sigil_x({ :<<>>, line, pieces }, []) do
    binary = { :<<>>, line, Macro.unescape_tokens(pieces) }
    quote do: System.cmd(unquote(binary))
  end
  
  @doc """
  Handles the sigil %X. Takes the given command line string, executes it, and returns the 
  results as a string. Does not unescape characters or replace interpolations.
  
  ## Examples
  
      iex> %X"echo Hello \x45\x6c\x69\x78\x69\x72\x21"
      "Hello x45x6cx69x78x69x72x21\n"
      
  """
  defmacro sigil_X({ :<<>>, _line, [string] }, []) when is_binary(string) do
    System.cmd(string)
  end
end