https://github.com/akkartik/mu/blob/master/screen.mu

     1 # example program: managing the display using 'screen' objects
     2
     3 # The zero screen below means 'use the real screen'. Tests can also use fake
     4 # screens.
     5 def main [
     6   open-console
     7   clear-screen null/screen  # non-scrolling app
     8   10:char <- copy 97/a
     9   print null/screen, 10:char/a, 1/red, 2/green
    10   1:num/raw, 2:num/raw <- cursor-position null/screen
    11   wait-for-event null/console
    12   clear-screen null/screen
    13   move-cursor null/screen, 0/row, 4/column
    14   10:char <- copy 98/b
    15   print null/screen, 10:char
    16   wait-for-event null/console
    17   move-cursor null/screen, 0/row, 0/column
    18   clear-line null/screen
    19   wait-for-event null/console
    20   cursor-down null/screen
    21   wait-for-event null/console
    22   cursor-right null/screen
    23   wait-for-event null/console
    24   cursor-left null/screen
    25   wait-for-event null/console
    26   cursor-up null/screen
    27   wait-for-event null/console
    28   close-console
    29 ]