gistfile1.txt

Pry.config.commands.command "edit-line", "Edits the current line in your editor" do
  require 'tempfile' unless defined? Tempfile

  to_edit = (eval_string =~ /^\s*$/ ? target.eval('inp[-1] || ""') : eval_string)

  temp_file = Tempfile.new('edit-line')
  temp_file.puts to_edit
  temp_file.close

  # HACK 1. this is a helper in the default command set.
  invoke_editor(temp_file.path, 0)

  eval_string.replace File.read(temp_file.path).sub(/\n*$/, "")

  temp_file.unlink

  unless eval_string =~ /^\s+$/
    # HACK 2. Ensure the user can see the result of this eval by making
    # sure val is not empty...
    opts[:val].replace(" ")
    class << opts[:val]; def replace(*args); end; end

    run "show-input"
  end
end