String leftFileName = commandLine.getArgs()[0];
String rightFileName = commandLine.getArgs()[1];
Reader leftReader = getReader(getFileInputStream(leftFileName));
Reader rightReader = getReader(getFileInputStream(rightFileName));
Parser leftParser = new AlParser(leftReader);
Parser rightParser = new AlParser(rightReader);
int width = createInt(commandLine, "width", PresentationFormatter.DEFAULT_WIDTH);
Formatter formatter = new PresentationFormatter(getErr(), width);
boolean showDiff = commandLine.hasOption('d');
List<Alignment> leftAlignmentList = leftParser.parse();
List<Alignment> rightAlignmentList = rightParser.parse();
Diff diff = compare(leftAlignmentList, rightAlignmentList);
if (showDiff) {