VolksForth/msdos/ced.fb

\ Commandline EDitor for volksFORTH rev. 3.80        cas 10nov05This File contains definitions to create an editable Forth      command line with history.                                      The commandline histroy allows older commands to be recalled.   These older commands will be stored in Screen 0 in a file called"history" and will be preserved even when calling SAVE-SYSTEM.                                                                                                                                  Keys:                                                             Cursor left/right                                             Delete Char                             <del> und <-            Delete Line                             <esc>                   toggle Insert                           <ins>                   finish line                             <enter>                 Jump to Beginning/End of Line           <pos1> <end>            recall older commands                                       \ Commandline EDitor LOAD-Screen                     cas 10nov05                                                                                                                                : curleft ( -- )  at? 1- at ;                                   : currite ( -- )  at? 1+ at ;                                                                                                   1 5 +thru  \ enhanced Input                                                                                                     .( Commandline Editor loaded ) cr                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               \ History -- Commandhistory                          cas 10nov05makefile history  1 more                                                                                                        | Variable line#       line# off                                | Variable lastline#   lastline# off                                                                                            | : 'history ( n -- addr )  isfile push  history                    c/l *   b/blk /mod  block + ;                                                                                               | : @line ( n -- addr len )  'history c/l -trailing ;           | : !history ( addr line# -- )                                        'history dup c/l blank  span @ c/l min cmove update ;     | : @history ( addr line# -- )                                        @line rot swap dup span ! cmove ;                                                                                         | : +line ( n addr -- )  dup @  rot + l/s  mod  swap ! ;        \ End of input                                       cas 10nov05                                                                | Variable maxchars               | Variable insert insert on                                                                   | : -text ( a1 a2 l -- 0=equal )  bounds                              ?DO count I c@ - ?dup IF nip ENDLOOP exit THEN LOOP 0= ;                                                                  | : done ( a p1 -- a p2 )  2dup                                       at?  rot -  span @ dup maxchars !  + at space blankline         line# @ @line  span @ = IF span @ -text 0=exit 2dup THEN        drop  lastline# @ !history  1 lastline# +line ;