calendar.rs

extern crate time;
 
fn main() {
  let now = time::now();
  let year = now.tm_year as uint + 1900;
  let month = now.tm_mon as uint + 1;
 
  let first_wday = {
    let mut t = now.clone();
    t.tm_mday = 1;
    t.to_local().tm_wday as uint
  };
 
  let last_day = match month {
    1 | 3 | 5 | 7 | 8 | 10 | 12 => 31u,
    4 | 6 | 9 | 11 => 30,
    _ if year % 4 == 0 && year % 100 != 0 || year % 400 == 0 => 29,
    _ => 28,
  };
      
  let xs =
    range(0u, first_wday).map(|_| format!("  "))
    .chain(range(1u, last_day + 1).map(|x| format!("{:2u}", x)))
    .collect::<Vec<_>>()
    .as_slice()
    .chunks(7)
    .map(|x| x.connect(" "))
    .collect::<Vec<_>>()
    .connect("\n");
        
  println!("{}", xs);
}