class Byebug::EditCommand

def execute
  if !@match[1]
    unless @state.file
      return errmsg "We are not in a state that has an associated file.\n"
    end
    file = @state.file
    line = @state.line if @state.line
  elsif (@pos_match = /([^:]+)[:]([0-9]+)/.match(@match[1]))
    file, line = @pos_match.captures
  elsif File.exist?(@match[1])
    file = @match[1]
  else
    return errmsg "Invalid file[:line] number specification: #{@match[1]}\n"
  end
  editor = ENV['EDITOR'] || 'vim'
  if File.readable?(file)
    system("#{editor} +#{line} #{file}") if line
    system("#{editor} #{file}") unless line
  else
    errmsg "File \"#{file}\" is not readable.\n"
  end
end