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toolshed lib_src core grep.ex
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lib_src/core/grep.ex 

defmodule Toolshed.Core.Grep do

  @doc """

  Run a regular expression on a file and print the matching lines.



      iex> grep ~r/video/, "/etc/mime.types"



  If colored is enabled for the shell, the matches will be highlighted red.

  """

  @spec grep(Regex.t(), Path.t()) :: :"do not show this result in output"

  def grep(regex, path) do

    File.stream!(path)

    |> Stream.filter(&Regex.match?(regex, &1))

    |> Stream.map(fn line ->

      Regex.replace(regex, line, &IO.ANSI.format([:red, &1]))

    end)

    |> Stream.each(&IO.write/1)

    |> Stream.run()



    IEx.dont_display_result()

  end

end