class IRB::ExtendCommand::ShowSource

def show_source(source)
  file_content = IRB::Color.colorize_code(File.read(source.file))
  code = file_content.lines[(source.first_line - 1)...source.last_line].join
  content = <<~CONTENT
    #{bold("From")}: #{source.file}:#{source.first_line}
    #{code}
  CONTENT
  Pager.page_content(content)
end