shadow copy of https://shyr.io/blog/iex-copy-to-clipboard

helper.exs

defmodule Helpers do
  def copy(term) do
    text =
      if is_binary(term) do
        term
      else
        inspect(term, limit: :infinity, pretty: true)
      end

    port = Port.open({:spawn, "pbcopy"}, [])
    true = Port.command(port, text)
    true = Port.close(port)

    :ok
  end
end