VolksForth/AtariST/UNDO.FB

\\ Undo for the VolksForth command line             cas2013apr05                                                                The tool extends the VolksForth "decode" function               with an UNDO. If there was a typo in the previous line          pressing the UNDO key will re-fetch the last entered line so    that it can be edited                                                                                                           Published in VD 3/87 by Bernd Pennemann                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         \ Undo for Atari ST                                 cas2013apr05Onlyforth                                                                                                                       | $6100 Constant #undo                                                                                                          : undoSTdecode ( addr pos1 key -- addr pos2 )                     over 0= if                                                        #undo case? if at? >r >r                                                       over #tib @  dup span ! type                                    r> r> at exit then then                        STdecode ;                                                                                                                    Input: keyboard  STkey STkey? undoSTdecode STexpect ;                                                                           keyboard save