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Annotation of gforth/history.fs, revision 1.8

1.4       pazsan      1: \ History file support                                 16oct94py
                      2: 
1.8     ! anton       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: 
1.4       pazsan     21: 0 Value history
                     22: 
                     23: 2Variable forward^
                     24: 2Variable backward^
                     25: 2Variable end^
                     26: 
1.7       pazsan     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: 
1.4       pazsan     31: : get-history ( addr len -- wid )
1.7       pazsan     32:   force-open to history
1.4       pazsan     33:   history file-size throw
                     34:   2dup forward^ 2! 2dup backward^ 2! end^ 2! ;
                     35: 
1.6       anton      36: s" ~/.gforth-history" get-history
1.4       pazsan     37: 
1.6       anton      38: : history-cold
                     39:     Defers 'cold
                     40:     s" ~/.gforth-history" get-history ;
1.4       pazsan     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: 
1.7       pazsan     52: : hist-pos    ( -- ud )  history file-position throw ;
                     53: : hist-setpos ( ud -- )  history reposition-file throw ;
1.4       pazsan     54: 
1.7       pazsan     55: : get-line ( addr len -- len' flag )
                     56:   swap history read-line throw ;
                     57: 
1.4       pazsan     58: : next-line  ( max span addr pos1 -- max span addr pos2 false )
                     59:   clear-line
1.7       pazsan     60:   forward^ 2@ 2dup hist-setpos backward^ 2!
                     61:   2dup get-line drop
                     62:   hist-pos  forward^ 2!
                     63:   tuck 2dup type 0 ;
1.4       pazsan     64: 
                     65: : prev-line  ( max span addr pos1 -- max span addr pos2 false )
1.7       pazsan     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 ;
1.4       pazsan     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 )
1.7       pazsan     81:   >r end^ 2@ hist-setpos
                     82:   2dup swap history write-line throw
                     83:   hist-pos 2dup backward^ 2! end^ 2!
1.4       pazsan     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=  IF  2drop 1  EXIT  THEN
                    101:   cell+ >r cell+ count $1F and
                    102:   dup r@ c@ $1F and =
                    103:   IF  r> char+ capscomp 0<=  EXIT  THEN
                    104:   nip r> c@ $1F and < ;
                    105: 
1.7       pazsan    106: : search-voc ( addr len nfa1 nfa2 -- addr len nfa3 ) >r
                    107:     BEGIN  dup  WHILE  >r dup r@ cell+ c@ $1F and <=
                    108:        IF  2dup r@ cell+ char+ capscomp  0=
                    109:            IF  r> dup r@ word-lex
                    110:                IF  dup prefix-found @ word-lex
                    111:                    0>= IF  rdrop dup >r  THEN
                    112:                THEN >r
                    113:            THEN
                    114:        THEN  r> @
                    115:     REPEAT drop r> ;
                    116: 
                    117: : prefix-string ( addr len nfa -- addr' len' )
                    118:     dup prefix-found !  ?dup
                    119:     IF  cell+ count $1F and rot /string rot drop
                    120:        dup 1+ prefix-found cell+ !
                    121:     ELSE
                    122:        2drop s" " prefix-found cell+ off
                    123:     THEN ;
                    124: 
                    125: : search-prefix  ( addr1 len1 -- addr2 len2 )
                    126:     0 vp dup @ 1- cells over +
                    127:     DO  I 2@ <>
                    128:         IF  I cell+ @ @ swap  search-voc  THEN
                    129:        [ -1 cells ] Literal +LOOP
                    130:     prefix-string ;
                    131: 
                    132: : kill-expand ( max span addr pos1 -- max span addr pos2 )
                    133:     prefix-found cell+ @  0 ?DO  (del)  LOOP ;
                    134: 
                    135: : tib-full? ( max span addr pos addr' len' -- max span addr pos addr1 u flag )
                    136:     5 pick over 4 pick + prefix-found @ 0<> - < ;
1.4       pazsan    137: 
                    138: : tab-expand ( max span addr pos1 -- max span addr pos2 0 )
1.7       pazsan    139:     kill-expand  2dup extract-word search-prefix
                    140:     tib-full?
                    141:     IF    7 emit  2drop  0 0 prefix-found 2!
                    142:     ELSE  bounds ?DO  I c@ (ins)  LOOP  THEN
                    143:     prefix-found @ IF  bl (ins)  THEN  0 ;
1.4       pazsan    144: 
                    145: : kill-prefix  ( key -- key )
                    146:   dup #tab <> IF  0 0 prefix-found 2!  THEN ;
                    147: 
                    148: ' kill-prefix IS everychar
                    149: 
                    150: ' next-line  ctrl N cells ctrlkeys + !
                    151: ' prev-line  ctrl P cells ctrlkeys + !
                    152: ' clear-tib  ctrl K cells ctrlkeys + !
                    153: ' first-pos  ctrl A cells ctrlkeys + !
                    154: ' end-pos    ctrl E cells ctrlkeys + !
                    155: ' (enter)    #lf    cells ctrlkeys + !
                    156: ' (enter)    #cr    cells ctrlkeys + !
                    157: ' tab-expand #tab   cells ctrlkeys + !