ceylonでカレンダー

cal.ceylon

//@3846masa
import ceylon.time { now, date, Date }

void run() {
  Date today = now().date();

  Integer start_wday = date(today.year, today.month, 1).dayOfWeek.integer;
  Integer all_days = today.month.numberOfDays();

  for (day in (1 - start_wday)..all_days) {
    String day_str = (day <= 0) then "" else day.string;
    process.write(day_str.padLeading(2));
    String pad = ((day + start_wday) % 7 == 0) then "\n" else " ";
    process.write(pad);
  }

  process.write("\n");
}