This is based on Ron Aaron's "Magic 8th Ball" - CLI version. See,1864.msg10733.html

First is the list of responses. This is just an array.

~~~{ 'OK   'Yes   'Absolutely!   'Surely   'Perhaps   'Could_be   'Hard_to_say   'Maybe   'Unclear   'Ask_later   'Down_for_maintenance   'ABEND_12345   'No   'Definitely_not!   'Leave_me_alone } 'PROPHESIES const ~~~

To get a random prophecy: get the length of the array, a random number, and calculate an index based on these to fetch.

~~~:prophesy (-s)   PROPHESIES dup a:length n:random n:abs swap mod a:fetch ; ~~~

This finishes the core of the application. The remaining part is the user interface. RETRO doesn't have GUI bindings, so I'm only implementing the CLI interface.

My approach is a little different from the original. I split the input "processing" into a separate word. RETRO doesn't have a null string, so I left out the check for that. Exit with CTRL+C.

~~~:process-input (s-)   s:empty [ 'C'mon,_don't_be_like_that!_Ask_a_question: s:put nl ] s:case   drop prophesy '\nThe_8th_ball_says:\n\t%s\n\n s:format s:put                 '\nAsk_again_and_you_shall_be_answered:\n s:format s:put ;   :8th-ball-cli (-)   'Ask_your_question_of_the_8th-ball.__Satisfaction_guaranteed! s:put nl   repeat     s:get process-input   again ; ~~~