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Diff for /gforth/history.fs between versions 1.3 and 1.9

version 1.3, 1994/11/03 15:27:57 version 1.9, 1996/01/07 17:22:11
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 \ History file support                                 16oct94py  \ History file support                                 16oct94py
   
 0 Value history  \ Copyright (C) 1995 Free Software Foundation, Inc.
   
 2Variable forward^  \ This file is part of Gforth.
 2Variable backward^  
 2Variable end^  \ Gforth is free software; you can redistribute it and/or
   \ modify it under the terms of the GNU General Public License
 : get-history ( addr len -- wid )  \ as published by the Free Software Foundation; either version 2
   2dup r/w open-file 0<  \ of the License, or (at your option) any later version.
   IF  drop r/w create-file throw  ELSE  nip nip  THEN  
   to history  \ This program is distributed in the hope that it will be useful,
   history file-size throw  \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   2dup forward^ 2! 2dup backward^ 2! end^ 2! ;  \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   \ GNU General Public License for more details.
 s" gforth.history" get-history  
   \ You should have received a copy of the GNU General Public License
 \ moving in history file                               16oct94py  \ along with this program; if not, write to the Free Software
   \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 : clear-line ( max span addr pos1 -- max addr )  
   backspaces over spaces swap backspaces ;  0 Value history
   
 : clear-tib ( max span addr pos -- max 0 addr 0 false )  2Variable forward^
   clear-line 0 tuck dup ;  2Variable backward^
   2Variable end^
 : get-line ( max addr -- max span addr pos dpos )  
   history file-position throw  backward^ 2!  : force-open ( addr len -- handle )
   2dup swap history read-line throw drop    2dup r/w open-file 0<
   2dup type tuck    IF  drop r/w create-file throw  ELSE  nip nip  THEN ;
   history file-position throw  forward^ 2! ;  
   : get-history ( addr len -- wid )
 : next-line  ( max span addr pos1 -- max span addr pos2 false )    force-open to history
   clear-line    history file-size throw
   forward^ 2@ history reposition-file throw    2dup forward^ 2! 2dup backward^ 2! end^ 2! ;
   get-line  0 ;  
   s" ~/.gforth-history" get-history
 : prev-line  ( max span addr pos1 -- max span addr pos2 false )  
   clear-line over 2 + negate s>d backward^ 2@ d+ 0. dmax  : history-cold
   2dup history reposition-file throw      Defers 'cold
   BEGIN   2over swap history read-line throw  WHILE      s" ~/.gforth-history" get-history ;
           >r history file-position throw  
           2dup backward^ 2@ d<  WHILE  2swap 2drop rdrop  ' history-cold IS 'cold
   REPEAT  ELSE  >r history file-position throw  THEN  
   forward^ 2!  backward^ 2!  r> tuck 2dup type 0 ;  \ moving in history file                               16oct94py
   
 : ctrl  ( "<char>" -- ctrl-code )  : clear-line ( max span addr pos1 -- max addr )
   char [char] @ - postpone Literal ; immediate    backspaces over spaces swap backspaces ;
   
 Create lfpad #lf c,  : clear-tib ( max span addr pos -- max 0 addr 0 false )
     clear-line 0 tuck dup ;
 : (enter)  ( max span addr pos1 -- max span addr pos2 true )  
   >r end^ 2@ history reposition-file throw  : hist-pos    ( -- ud )  history file-position throw ;
   2dup swap history write-file throw  : hist-setpos ( ud -- )  history reposition-file throw ;
   lfpad 1 history write-file throw  
   history file-position throw 2dup backward^ 2! end^ 2!  : get-line ( addr len -- len' flag )
   r> (ret) ;    swap history read-line throw ;
   
 \ some other key commands                              16oct94py  : next-line  ( max span addr pos1 -- max span addr pos2 false )
     clear-line
 : first-pos  ( max span addr pos1 -- max span addr 0 0 )    forward^ 2@ 2dup hist-setpos backward^ 2!
   backspaces 0 0 ;    2dup get-line drop
 : end-pos  ( max span addr pos1 -- max span addr span 0 )    hist-pos  forward^ 2!
   type-rest 2drop over 0 ;    tuck 2dup type 0 ;
   
 : extract-word ( addr len -- addr' len' )  dup >r  : prev-line  ( max span addr pos1 -- max span addr pos2 false )
   BEGIN  1- dup 0>=  WHILE  2dup + c@ bl =  UNTIL  THEN  1+    clear-line  backward^ 2@ forward^ 2!
   tuck + r> rot - ;    over 2 + negate s>d backward^ 2@ d+ 0. dmax 2dup hist-setpos
     BEGIN
 Create prefix-found  0 , 0 ,        backward^ 2!   2dup get-line  WHILE
         hist-pos 2dup forward^ 2@ d<  WHILE
 : word-lex ( nfa1 nfa2 -- -1/0/1 )        rot drop
   dup 0=  IF  2drop 1  EXIT  THEN    REPEAT  2drop  THEN
   cell+ >r cell+ count $1F and    tuck 2dup type 0 ;
   dup r@ c@ $1F and =  
   IF  r> char+ capscomp 0<=  EXIT  THEN  : ctrl  ( "<char>" -- ctrl-code )
   nip r> c@ $1F and < ;    char [char] @ - postpone Literal ; immediate
   
 : search-prefix  ( addr len1 -- suffix len2 )  0 >r  context  Create lfpad #lf c,
   BEGIN  BEGIN  dup @ over  cell - @ =  WHILE  cell -  REPEAT  
          dup >r -rot r> @ @  : (enter)  ( max span addr pos1 -- max span addr pos2 true )
          BEGIN  dup  WHILE  >r dup r@ cell+ c@ $1F and <=    >r end^ 2@ hist-setpos
                 IF  2dup r@ cell+ char+ capscomp  0=    2dup swap history write-line throw
                     IF  r> dup r@ word-lex    hist-pos 2dup backward^ 2! end^ 2!
                         IF  dup prefix-found @ word-lex    r> (ret) ;
                             0>= IF  rdrop dup >r  THEN  
                         THEN >r  \ some other key commands                              16oct94py
                     THEN  
                 THEN  r> @  : first-pos  ( max span addr pos1 -- max span addr 0 0 )
          REPEAT  drop rot cell -  dup vp u> 0=    backspaces 0 0 ;
   UNTIL  drop r> dup prefix-found ! ?dup  : end-pos  ( max span addr pos1 -- max span addr span 0 )
   IF    cell+ count $1F and rot /string rot drop    type-rest 2drop over 0 ;
   ELSE  2drop s" "  THEN  ;  
   : extract-word ( addr len -- addr' len' )  dup >r
 : tab-expand ( max span addr pos1 -- max span addr pos2 0 )    BEGIN  1- dup 0>=  WHILE  2dup + c@ bl =  UNTIL  THEN  1+
   prefix-found cell+ @  0 ?DO  (del)  LOOP    tuck + r> rot - ;
   2dup extract-word search-prefix  
   dup prefix-found @ 0<> - prefix-found cell+ !  Create prefix-found  0 , 0 ,
   bounds ?DO  I c@ (ins)  LOOP  
   prefix-found @ IF  bl (ins)  THEN  0 ;  : word-lex ( nfa1 nfa2 -- -1/0/1 )
       dup 0=
 : kill-prefix  ( key -- key )      IF
   dup #tab <> IF  0 0 prefix-found 2!  THEN ;          2drop 1  EXIT
       THEN
 ' kill-prefix IS everychar      name>string 2>r name>string
       dup r@ =
 ' next-line  ctrl N cells ctrlkeys + !      IF
 ' prev-line  ctrl P cells ctrlkeys + !          rdrop r> capscomp 0<= EXIT
 ' clear-tib  ctrl K cells ctrlkeys + !      THEN
 ' first-pos  ctrl A cells ctrlkeys + !      r> <
 ' end-pos    ctrl E cells ctrlkeys + !      nip rdrop ;
 ' (enter)    #lf    cells ctrlkeys + !  
 ' (enter)    #cr    cells ctrlkeys + !  : search-voc ( addr len nfa1 nfa2 -- addr len nfa3 )
 ' tab-expand #tab   cells ctrlkeys + !      >r
       BEGIN
           dup
       WHILE
           >r dup r@ name>string nip <=
           IF
               2dup r@ name>string drop capscomp  0=
               IF
                   r> dup r@ word-lex
                   IF
                       dup prefix-found @ word-lex
                       0>=
                       IF
                           rdrop dup >r
                       THEN
                   THEN
                   >r
               THEN
           THEN
           r> @
       REPEAT
       drop r> ;
   
   : prefix-string ( addr len nfa -- addr' len' )
       dup prefix-found !  ?dup
       IF
           name>string rot /string rot drop
           dup 1+ prefix-found cell+ !
       ELSE
           2drop s" " prefix-found cell+ off
       THEN ;
   
   : search-prefix  ( addr1 len1 -- addr2 len2 )
       0 vp dup @ 1- cells over +
       DO  I 2@ <>
           IF  I cell+ @ @ swap  search-voc  THEN
           [ -1 cells ] Literal +LOOP
       prefix-string ;
   
   : kill-expand ( max span addr pos1 -- max span addr pos2 )
       prefix-found cell+ @  0 ?DO  (del)  LOOP ;
   
   : tib-full? ( max span addr pos addr' len' -- max span addr pos addr1 u flag )
       5 pick over 4 pick + prefix-found @ 0<> - < ;
   
   : tab-expand ( max span addr pos1 -- max span addr pos2 0 )
       kill-expand  2dup extract-word search-prefix
       tib-full?
       IF    7 emit  2drop  0 0 prefix-found 2!
       ELSE  bounds ?DO  I c@ (ins)  LOOP  THEN
       prefix-found @ IF  bl (ins)  THEN  0 ;
   
   : kill-prefix  ( key -- key )
     dup #tab <> IF  0 0 prefix-found 2!  THEN ;
   
   ' kill-prefix IS everychar
   
   ' next-line  ctrl N cells ctrlkeys + !
   ' prev-line  ctrl P cells ctrlkeys + !
   ' clear-tib  ctrl K cells ctrlkeys + !
   ' first-pos  ctrl A cells ctrlkeys + !
   ' end-pos    ctrl E cells ctrlkeys + !
   ' (enter)    #lf    cells ctrlkeys + !
   ' (enter)    #cr    cells ctrlkeys + !
   ' tab-expand #tab   cells ctrlkeys + !
Removed from v.1.3  
changed lines
  Added in v.1.9

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