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added more.fs for people with old terminals.
WORDS and SEE now now respect the terminal size.
a lot of reordering in the Makefile, approaching the GNU standards.
factored NAME>STRING out of many words.
use AC_DECL_SYS_SIGLIST test in configure.in.
removed emitcounter (it was not used anyway).
SYSTEM now unpreps and repreps the terminal.
fixed byg in prims2x.fs.
added NEEDS, ?CSP, !CSP.
rewrote ALIAS?.

    1: \ History file 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: 0 Value history
   22: 
   23: 2Variable forward^
   24: 2Variable backward^
   25: 2Variable end^
   26: 
   27: : force-open ( addr len -- handle )
   28:   2dup r/w open-file 0<
   29:   IF  drop r/w create-file throw  ELSE  nip nip  THEN ;
   30: 
   31: : get-history ( addr len -- wid )
   32:   force-open to history
   33:   history file-size throw
   34:   2dup forward^ 2! 2dup backward^ 2! end^ 2! ;
   35: 
   36: s" ~/.gforth-history" get-history
   37: 
   38: : history-cold
   39:     Defers 'cold
   40:     s" ~/.gforth-history" get-history ;
   41: 
   42: ' history-cold IS 'cold
   43: 
   44: \ moving in history file                               16oct94py
   45: 
   46: : clear-line ( max span addr pos1 -- max addr )
   47:   backspaces over spaces swap backspaces ;
   48: 
   49: : clear-tib ( max span addr pos -- max 0 addr 0 false )
   50:   clear-line 0 tuck dup ;
   51: 
   52: : hist-pos    ( -- ud )  history file-position throw ;
   53: : hist-setpos ( ud -- )  history reposition-file throw ;
   54: 
   55: : get-line ( addr len -- len' flag )
   56:   swap history read-line throw ;
   57: 
   58: : next-line  ( max span addr pos1 -- max span addr pos2 false )
   59:   clear-line
   60:   forward^ 2@ 2dup hist-setpos backward^ 2!
   61:   2dup get-line drop
   62:   hist-pos  forward^ 2!
   63:   tuck 2dup type 0 ;
   64: 
   65: : prev-line  ( max span addr pos1 -- max span addr pos2 false )
   66:   clear-line  backward^ 2@ forward^ 2!
   67:   over 2 + negate s>d backward^ 2@ d+ 0. dmax 2dup hist-setpos
   68:   BEGIN
   69:       backward^ 2!   2dup get-line  WHILE
   70:       hist-pos 2dup forward^ 2@ d<  WHILE
   71:       rot drop
   72:   REPEAT  2drop  THEN
   73:   tuck 2dup type 0 ;
   74: 
   75: : ctrl  ( "<char>" -- ctrl-code )
   76:   char [char] @ - postpone Literal ; immediate
   77: 
   78: Create lfpad #lf c,
   79: 
   80: : (enter)  ( max span addr pos1 -- max span addr pos2 true )
   81:   >r end^ 2@ hist-setpos
   82:   2dup swap history write-line throw
   83:   hist-pos 2dup backward^ 2! end^ 2!
   84:   r> (ret) ;
   85: 
   86: \ some other key commands                              16oct94py
   87: 
   88: : first-pos  ( max span addr pos1 -- max span addr 0 0 )
   89:   backspaces 0 0 ;
   90: : end-pos  ( max span addr pos1 -- max span addr span 0 )
   91:   type-rest 2drop over 0 ;
   92: 
   93: : extract-word ( addr len -- addr' len' )  dup >r
   94:   BEGIN  1- dup 0>=  WHILE  2dup + c@ bl =  UNTIL  THEN  1+
   95:   tuck + r> rot - ;
   96: 
   97: Create prefix-found  0 , 0 ,
   98: 
   99: : word-lex ( nfa1 nfa2 -- -1/0/1 )
  100:     dup 0=
  101:     IF
  102: 	2drop 1  EXIT
  103:     THEN
  104:     name>string 2>r name>string
  105:     dup r@ =
  106:     IF
  107: 	rdrop r> capscomp 0<= EXIT
  108:     THEN
  109:     r> <
  110:     nip rdrop ;
  111: 
  112: : search-voc ( addr len nfa1 nfa2 -- addr len nfa3 )
  113:     >r
  114:     BEGIN
  115: 	dup
  116:     WHILE
  117: 	>r dup r@ name>string nip <=
  118: 	IF
  119: 	    2dup r@ name>string drop capscomp  0=
  120: 	    IF
  121: 		r> dup r@ word-lex
  122: 		IF
  123: 		    dup prefix-found @ word-lex
  124: 		    0>=
  125: 		    IF
  126: 			rdrop dup >r
  127: 		    THEN
  128: 		THEN
  129: 		>r
  130: 	    THEN
  131: 	THEN
  132: 	r> @
  133:     REPEAT
  134:     drop r> ;
  135: 
  136: : prefix-string ( addr len nfa -- addr' len' )
  137:     dup prefix-found !  ?dup
  138:     IF
  139: 	name>string rot /string rot drop
  140: 	dup 1+ prefix-found cell+ !
  141:     ELSE
  142: 	2drop s" " prefix-found cell+ off
  143:     THEN ;
  144: 
  145: : search-prefix  ( addr1 len1 -- addr2 len2 )
  146:     0 vp dup @ 1- cells over +
  147:     DO  I 2@ <>
  148:         IF  I cell+ @ @ swap  search-voc  THEN
  149: 	[ -1 cells ] Literal +LOOP
  150:     prefix-string ;
  151: 
  152: : kill-expand ( max span addr pos1 -- max span addr pos2 )
  153:     prefix-found cell+ @  0 ?DO  (del)  LOOP ;
  154: 
  155: : tib-full? ( max span addr pos addr' len' -- max span addr pos addr1 u flag )
  156:     5 pick over 4 pick + prefix-found @ 0<> - < ;
  157: 
  158: : tab-expand ( max span addr pos1 -- max span addr pos2 0 )
  159:     kill-expand  2dup extract-word search-prefix
  160:     tib-full?
  161:     IF    7 emit  2drop  0 0 prefix-found 2!
  162:     ELSE  bounds ?DO  I c@ (ins)  LOOP  THEN
  163:     prefix-found @ IF  bl (ins)  THEN  0 ;
  164: 
  165: : kill-prefix  ( key -- key )
  166:   dup #tab <> IF  0 0 prefix-found 2!  THEN ;
  167: 
  168: ' kill-prefix IS everychar
  169: 
  170: ' next-line  ctrl N cells ctrlkeys + !
  171: ' prev-line  ctrl P cells ctrlkeys + !
  172: ' clear-tib  ctrl K cells ctrlkeys + !
  173: ' first-pos  ctrl A cells ctrlkeys + !
  174: ' end-pos    ctrl E cells ctrlkeys + !
  175: ' (enter)    #lf    cells ctrlkeys + !
  176: ' (enter)    #cr    cells ctrlkeys + !
  177: ' tab-expand #tab   cells ctrlkeys + !