File:  [gforth] / gforth / history.fs
Revision 1.14: download - view: text, annotated - select for diffs
Tue Mar 4 22:09:53 1997 UTC (25 years, 4 months ago) by pazsan
Branches: MAIN
CVS tags: v0-3-0, HEAD
fixed key? problem on Win32
Minor fixes

    1: \ command line edit and history support                 16oct94py
    2: 
    3: \ Copyright (C) 1995 Free Software Foundation, Inc.
    4: 
    5: \ This file is part of Gforth.
    6: 
    7: \ Gforth is free software; you can redistribute it and/or
    8: \ modify it under the terms of the GNU General Public License
    9: \ as published by the Free Software Foundation; either version 2
   10: \ of the License, or (at your option) any later version.
   11: 
   12: \ This program is distributed in the hope that it will be useful,
   13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15: \ GNU General Public License for more details.
   16: 
   17: \ You should have received a copy of the GNU General Public License
   18: \ along with this program; if not, write to the Free Software
   19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   20: 
   21: :noname
   22:     char [char] @ - ;
   23: :noname
   24:     char [char] @ - postpone Literal ;
   25: interpret/compile: ctrl  ( "<char>" -- ctrl-code )
   26: 
   27: \ command line editing                                  16oct94py
   28: 
   29: : >string  ( span addr pos1 -- span addr pos1 addr2 len )
   30:   over 3 pick 2 pick chars /string ;
   31: : type-rest ( span addr pos1 -- span addr pos1 back )
   32:   >string tuck type ;
   33: : (del)  ( max span addr pos1 -- max span addr pos2 )
   34:   1- >string over 1+ -rot move
   35:   rot 1- -rot  #bs emit  type-rest bl emit 1+ backspaces ;
   36: : (ins)  ( max span addr pos1 char -- max span addr pos2 )
   37:   >r >string over 1+ swap move 2dup chars + r> swap c!
   38:   rot 1+ -rot type-rest 1- backspaces 1+ ;
   39: : ?del ( max span addr pos1 -- max span addr pos2 0 )
   40:   dup  IF  (del)  THEN  0 ;
   41: : (ret)  type-rest drop true space ;
   42: : back  dup  IF  1- #bs emit  ELSE  #bell emit  THEN 0 ;
   43: : forw 2 pick over <> IF  2dup + c@ emit 1+  ELSE  #bell emit  THEN 0 ;
   44: : eof  2 pick over or 0=  IF
   45:         bye
   46:     ELSE  2 pick over <>
   47: 	IF  forw drop (del)  ELSE  #bell emit  THEN  0
   48:     THEN ;
   49: 
   50: ' forw  ctrl F cells ctrlkeys + !
   51: ' back  ctrl B cells ctrlkeys + !
   52: ' ?del  ctrl H cells ctrlkeys + !
   53: ' eof   ctrl D cells ctrlkeys + !
   54: 
   55: ' (ins) IS insert-char
   56: 
   57: \ history support                                       16oct94py
   58: 
   59: 0 Value history \ history file fid
   60: 
   61: 2Variable forward^
   62: 2Variable backward^
   63: 2Variable end^
   64: 
   65: : force-open ( addr len -- fid )
   66:   2dup r/w open-file 0<
   67:   IF  drop r/w create-file throw  ELSE  nip nip  THEN ;
   68: 
   69: : get-history ( addr len -- )
   70:   force-open to history
   71:   history file-size throw
   72:   2dup forward^ 2! 2dup backward^ 2! end^ 2! ;
   73: 
   74: s" GFORTHHIST" getenv dup 0= [IF]
   75:     2drop s" ~/.gforth-history"
   76: [THEN] get-history
   77: 
   78: : history-cold
   79:     Defers 'cold
   80:     s" GFORTHHIST" getenv dup 0= IF
   81: 	2drop s" ~/.gforth-history"
   82:     THEN  get-history ;
   83: 
   84: ' history-cold IS 'cold
   85: 
   86: \ moving in history file                               16oct94py
   87: 
   88: : clear-line ( max span addr pos1 -- max addr )
   89:   backspaces over spaces swap backspaces ;
   90: 
   91: : clear-tib ( max span addr pos -- max 0 addr 0 false )
   92:   clear-line 0 tuck dup ;
   93: 
   94: : hist-pos    ( -- ud )  history file-position throw ;
   95: : hist-setpos ( ud -- )  history reposition-file throw ;
   96: 
   97: : get-line ( addr len -- len' flag )
   98:   swap history read-line throw ;
   99: 
  100: : next-line  ( max span addr pos1 -- max span addr pos2 false )
  101:   clear-line
  102:   forward^ 2@ 2dup hist-setpos backward^ 2!
  103:   2dup get-line drop
  104:   hist-pos  forward^ 2!
  105:   tuck 2dup type 0 ;
  106: 
  107: : prev-line  ( max span addr pos1 -- max span addr pos2 false )
  108:   clear-line  backward^ 2@ forward^ 2!
  109:   over 2 + negate s>d backward^ 2@ d+ 0. dmax 2dup hist-setpos
  110:   BEGIN
  111:       backward^ 2!   2dup get-line  WHILE
  112:       hist-pos 2dup forward^ 2@ d<  WHILE
  113:       rot drop
  114:   REPEAT  2drop  THEN
  115:   tuck 2dup type 0 ;
  116: 
  117: Create lfpad #lf c,
  118: 
  119: : (enter)  ( max span addr pos1 -- max span addr pos2 true )
  120:   >r end^ 2@ hist-setpos
  121:   2dup swap history write-line throw
  122:   hist-pos 2dup backward^ 2! end^ 2!
  123:   r> (ret) ;
  124: 
  125: \ some other key commands                              16oct94py
  126: 
  127: : first-pos  ( max span addr pos1 -- max span addr 0 0 )
  128:   backspaces 0 0 ;
  129: : end-pos  ( max span addr pos1 -- max span addr span 0 )
  130:   type-rest 2drop over 0 ;
  131: 
  132: : extract-word ( addr len -- addr' len' )  dup >r
  133:   BEGIN  1- dup 0>=  WHILE  2dup + c@ bl =  UNTIL  THEN  1+
  134:   tuck + r> rot - ;
  135: 
  136: Create prefix-found  0 , 0 ,
  137: 
  138: : word-lex ( nfa1 nfa2 -- -1/0/1 )
  139:     dup 0=
  140:     IF
  141: 	2drop 1  EXIT
  142:     THEN
  143:     name>string 2>r name>string
  144:     dup r@ =
  145:     IF
  146: 	rdrop r> capscomp 0<= EXIT
  147:     THEN
  148:     r> <
  149:     nip rdrop ;
  150: 
  151: : search-voc ( addr len nfa1 nfa2 -- addr len nfa3 )
  152:     >r
  153:     BEGIN
  154: 	dup
  155:     WHILE
  156: 	>r dup r@ name>string nip <=
  157: 	IF
  158: 	    2dup r@ name>string drop capscomp  0=
  159: 	    IF
  160: 		r> dup r@ word-lex
  161: 		IF
  162: 		    dup prefix-found @ word-lex
  163: 		    0>=
  164: 		    IF
  165: 			rdrop dup >r
  166: 		    THEN
  167: 		THEN
  168: 		>r
  169: 	    THEN
  170: 	THEN
  171: 	r> @
  172:     REPEAT
  173:     drop r> ;
  174: 
  175: : prefix-string ( addr len nfa -- addr' len' )
  176:     dup prefix-found !  ?dup
  177:     IF
  178: 	name>string rot /string rot drop
  179: 	dup 1+ prefix-found cell+ !
  180:     ELSE
  181: 	2drop s" " prefix-found cell+ off
  182:     THEN ;
  183: 
  184: : search-prefix  ( addr1 len1 -- addr2 len2 )
  185:     0 vp dup @ 1- cells over +
  186:     DO  I 2@ <>
  187:         IF  I cell+ @ @ swap  search-voc  THEN
  188: 	[ -1 cells ] Literal +LOOP
  189:     prefix-string ;
  190: 
  191: : kill-expand ( max span addr pos1 -- max span addr pos2 )
  192:     prefix-found cell+ @  0 ?DO  (del)  LOOP ;
  193: 
  194: : tib-full? ( max span addr pos addr' len' -- max span addr pos addr1 u flag )
  195:     5 pick over 4 pick + prefix-found @ 0<> - < ;
  196: 
  197: : tab-expand ( max span addr pos1 -- max span addr pos2 0 )
  198:     kill-expand  2dup extract-word search-prefix
  199:     tib-full?
  200:     IF    7 emit  2drop  0 0 prefix-found 2!
  201:     ELSE  bounds ?DO  I c@ (ins)  LOOP  THEN
  202:     prefix-found @ IF  bl (ins)  THEN  0 ;
  203: 
  204: : kill-prefix  ( key -- key )
  205:   dup #tab <> IF  0 0 prefix-found 2!  THEN ;
  206: 
  207: ' kill-prefix IS everychar
  208: 
  209: ' next-line  ctrl N cells ctrlkeys + !
  210: ' prev-line  ctrl P cells ctrlkeys + !
  211: ' clear-tib  ctrl K cells ctrlkeys + !
  212: ' first-pos  ctrl A cells ctrlkeys + !
  213: ' end-pos    ctrl E cells ctrlkeys + !
  214: ' (enter)    #lf    cells ctrlkeys + !
  215: ' (enter)    #cr    cells ctrlkeys + !
  216: ' tab-expand #tab   cells ctrlkeys + !

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