Annotation of gforth/history.fs, revision 1.22

1.11      pazsan      1: \ command line edit and history support                 16oct94py
1.4       pazsan      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: 
1.11      pazsan     21: :noname
                     22:     char [char] @ - ;
                     23: :noname
                     24:     char [char] @ - postpone Literal ;
1.12      anton      25: interpret/compile: ctrl  ( "<char>" -- ctrl-code )
1.11      pazsan     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 ;
1.22    ! pazsan     44: : eof ( max span addr pos1 -- max span addr pos2 0 )
        !            45:     2 pick over <>
        !            46:     IF  forw drop (del)  ELSE  #bell emit  THEN  0 ;
1.11      pazsan     47: 
                     48: ' forw  ctrl F cells ctrlkeys + !
                     49: ' back  ctrl B cells ctrlkeys + !
                     50: ' ?del  ctrl H cells ctrlkeys + !
                     51: ' eof   ctrl D cells ctrlkeys + !
                     52: 
                     53: ' (ins) IS insert-char
                     54: 
                     55: \ history support                                       16oct94py
                     56: 
1.13      anton      57: 0 Value history \ history file fid
1.4       pazsan     58: 
                     59: 2Variable forward^
                     60: 2Variable backward^
                     61: 2Variable end^
                     62: 
1.13      anton      63: : force-open ( addr len -- fid )
1.19      anton      64:     2dup r/w open-file
                     65:     IF
                     66:        drop r/w create-file throw
                     67:     ELSE
                     68:        nip nip
                     69:     THEN ;
1.4       pazsan     70: 
1.15      jwilke     71: s" os-class" environment? [IF] s" unix" compare 0= [ELSE] true [THEN] 
                     72: [IF]
1.16      pazsan     73: : history-file ( -- addr u )
1.14      pazsan     74:     s" GFORTHHIST" getenv dup 0= IF
                     75:        2drop s" ~/.gforth-history"
1.16      pazsan     76:     THEN ;
1.15      jwilke     77: [ELSE]
                     78: 
1.16      pazsan     79: : history-dir ( -- addr u )
1.15      jwilke     80:   s" TMP" getenv ?dup ?EXIT drop
                     81:   s" TEMP" getenv ?dup ?EXIT drop
                     82:   s" c:/" ;
                     83: 
1.16      pazsan     84: : history-file ( -- addr u )
1.15      jwilke     85:   s" GFORTHHIST" getenv ?dup ?EXIT
                     86:   drop
                     87:   history-dir pad place
1.16      pazsan     88:   s" /ghist.fs" pad +place pad count ;
                     89: [THEN]
1.15      jwilke     90: 
1.4       pazsan     91: \ moving in history file                               16oct94py
                     92: 
                     93: : clear-line ( max span addr pos1 -- max addr )
                     94:   backspaces over spaces swap backspaces ;
                     95: 
                     96: : clear-tib ( max span addr pos -- max 0 addr 0 false )
                     97:   clear-line 0 tuck dup ;
                     98: 
1.7       pazsan     99: : hist-pos    ( -- ud )  history file-position throw ;
                    100: : hist-setpos ( ud -- )  history reposition-file throw ;
1.4       pazsan    101: 
1.7       pazsan    102: : get-line ( addr len -- len' flag )
                    103:   swap history read-line throw ;
                    104: 
1.4       pazsan    105: : next-line  ( max span addr pos1 -- max span addr pos2 false )
                    106:   clear-line
1.7       pazsan    107:   forward^ 2@ 2dup hist-setpos backward^ 2!
                    108:   2dup get-line drop
                    109:   hist-pos  forward^ 2!
                    110:   tuck 2dup type 0 ;
1.4       pazsan    111: 
1.20      pazsan    112: : find-prev-line ( max addr -- max span addr pos2 )
                    113:   backward^ 2@ forward^ 2!
1.7       pazsan    114:   over 2 + negate s>d backward^ 2@ d+ 0. dmax 2dup hist-setpos
                    115:   BEGIN
                    116:       backward^ 2!   2dup get-line  WHILE
                    117:       hist-pos 2dup forward^ 2@ d<  WHILE
                    118:       rot drop
1.20      pazsan    119:   REPEAT  2drop  THEN  tuck ;
                    120: 
                    121: : prev-line  ( max span addr pos1 -- max span addr pos2 false )
                    122:     clear-line find-prev-line 2dup type 0 ;
1.4       pazsan    123: 
                    124: Create lfpad #lf c,
                    125: 
                    126: : (enter)  ( max span addr pos1 -- max span addr pos2 true )
1.7       pazsan    127:   >r end^ 2@ hist-setpos
                    128:   2dup swap history write-line throw
                    129:   hist-pos 2dup backward^ 2! end^ 2!
1.4       pazsan    130:   r> (ret) ;
                    131: 
                    132: \ some other key commands                              16oct94py
                    133: 
                    134: : first-pos  ( max span addr pos1 -- max span addr 0 0 )
                    135:   backspaces 0 0 ;
                    136: : end-pos  ( max span addr pos1 -- max span addr span 0 )
                    137:   type-rest 2drop over 0 ;
                    138: 
                    139: : extract-word ( addr len -- addr' len' )  dup >r
                    140:   BEGIN  1- dup 0>=  WHILE  2dup + c@ bl =  UNTIL  THEN  1+
                    141:   tuck + r> rot - ;
                    142: 
                    143: Create prefix-found  0 , 0 ,
                    144: 
                    145: : word-lex ( nfa1 nfa2 -- -1/0/1 )
1.9       anton     146:     dup 0=
                    147:     IF
                    148:        2drop 1  EXIT
                    149:     THEN
                    150:     name>string 2>r name>string
                    151:     dup r@ =
                    152:     IF
                    153:        rdrop r> capscomp 0<= EXIT
                    154:     THEN
                    155:     r> <
                    156:     nip rdrop ;
1.4       pazsan    157: 
1.9       anton     158: : search-voc ( addr len nfa1 nfa2 -- addr len nfa3 )
                    159:     >r
                    160:     BEGIN
                    161:        dup
                    162:     WHILE
                    163:        >r dup r@ name>string nip <=
                    164:        IF
                    165:            2dup r@ name>string drop capscomp  0=
                    166:            IF
                    167:                r> dup r@ word-lex
                    168:                IF
                    169:                    dup prefix-found @ word-lex
                    170:                    0>=
                    171:                    IF
                    172:                        rdrop dup >r
                    173:                    THEN
                    174:                THEN
                    175:                >r
1.7       pazsan    176:            THEN
1.9       anton     177:        THEN
                    178:        r> @
                    179:     REPEAT
                    180:     drop r> ;
1.7       pazsan    181: 
                    182: : prefix-string ( addr len nfa -- addr' len' )
                    183:     dup prefix-found !  ?dup
1.9       anton     184:     IF
                    185:        name>string rot /string rot drop
1.7       pazsan    186:        dup 1+ prefix-found cell+ !
                    187:     ELSE
                    188:        2drop s" " prefix-found cell+ off
                    189:     THEN ;
                    190: 
                    191: : search-prefix  ( addr1 len1 -- addr2 len2 )
                    192:     0 vp dup @ 1- cells over +
                    193:     DO  I 2@ <>
1.17      pazsan    194:         IF  I cell+ @ wordlist-id @ swap  search-voc  THEN
1.7       pazsan    195:        [ -1 cells ] Literal +LOOP
                    196:     prefix-string ;
                    197: 
                    198: : kill-expand ( max span addr pos1 -- max span addr pos2 )
                    199:     prefix-found cell+ @  0 ?DO  (del)  LOOP ;
                    200: 
                    201: : tib-full? ( max span addr pos addr' len' -- max span addr pos addr1 u flag )
                    202:     5 pick over 4 pick + prefix-found @ 0<> - < ;
1.4       pazsan    203: 
                    204: : tab-expand ( max span addr pos1 -- max span addr pos2 0 )
1.7       pazsan    205:     kill-expand  2dup extract-word search-prefix
                    206:     tib-full?
                    207:     IF    7 emit  2drop  0 0 prefix-found 2!
                    208:     ELSE  bounds ?DO  I c@ (ins)  LOOP  THEN
                    209:     prefix-found @ IF  bl (ins)  THEN  0 ;
1.4       pazsan    210: 
                    211: : kill-prefix  ( key -- key )
                    212:   dup #tab <> IF  0 0 prefix-found 2!  THEN ;
                    213: 
                    214: ' kill-prefix IS everychar
                    215: 
                    216: ' next-line  ctrl N cells ctrlkeys + !
                    217: ' prev-line  ctrl P cells ctrlkeys + !
                    218: ' clear-tib  ctrl K cells ctrlkeys + !
                    219: ' first-pos  ctrl A cells ctrlkeys + !
                    220: ' end-pos    ctrl E cells ctrlkeys + !
                    221: ' (enter)    #lf    cells ctrlkeys + !
                    222: ' (enter)    #cr    cells ctrlkeys + !
                    223: ' tab-expand #tab   cells ctrlkeys + !
1.19      anton     224: 
                    225: \ initializing history
                    226: 
                    227: : get-history ( addr len -- )
                    228:     ['] force-open catch
                    229:     ?dup-if
                    230:        \ !! >stderr
1.21      pazsan    231:         \ history-file type ." : " .error cr
                    232:        drop 2drop
1.19      anton     233:        ['] false ['] false ['] (ret)
                    234:     else
                    235:        to history
                    236:        history file-size throw
                    237:        2dup forward^ 2! 2dup backward^ 2! end^ 2!
                    238:        ['] next-line ['] prev-line ['] (enter)
                    239:     endif
                    240:     dup
                    241:     [ #lf    cells ctrlkeys + ]L !
                    242:     [ #cr    cells ctrlkeys + ]L !
                    243:     [ ctrl P cells ctrlkeys + ]L !
                    244:     [ ctrl N cells ctrlkeys + ]L !
                    245: ;
                    246: 
                    247: : history-cold ( -- )
                    248:     history-file get-history ;
                    249: 
                    250: ' history-cold INIT8 chained
                    251: history-cold
                    252: 

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