Annotation of gforth/history.fs, revision 1.16

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 ;
                     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: 
1.13      anton      59: 0 Value history \ history file fid
1.4       pazsan     60: 
                     61: 2Variable forward^
                     62: 2Variable backward^
                     63: 2Variable end^
                     64: 
1.13      anton      65: : force-open ( addr len -- fid )
1.7       pazsan     66:   2dup r/w open-file 0<
1.16    ! pazsan     67:   IF  drop r/w create-file
        !            68:       throw  ELSE  nip nip  THEN ;
1.4       pazsan     69: 
1.15      jwilke     70: s" os-class" environment? [IF] s" unix" compare 0= [ELSE] true [THEN] 
                     71: [IF]
1.16    ! pazsan     72: : history-file ( -- addr u )
1.14      pazsan     73:     s" GFORTHHIST" getenv dup 0= IF
                     74:        2drop s" ~/.gforth-history"
1.16    ! pazsan     75:     THEN ;
1.15      jwilke     76: [ELSE]
                     77: 
1.16    ! pazsan     78: : history-dir ( -- addr u )
1.15      jwilke     79:   s" TMP" getenv ?dup ?EXIT drop
                     80:   s" TEMP" getenv ?dup ?EXIT drop
                     81:   s" c:/" ;
                     82: 
1.16    ! pazsan     83: : history-file ( -- addr u )
1.15      jwilke     84:   s" GFORTHHIST" getenv ?dup ?EXIT
                     85:   drop
                     86:   history-dir pad place
1.16    ! pazsan     87:   s" /ghist.fs" pad +place pad count ;
        !            88: [THEN]
1.15      jwilke     89: 
1.16    ! pazsan     90: : get-history ( addr len -- )
        !            91:     ['] force-open catch
        !            92:     dup 0< IF  ." can't open " history-file type cr throw  THEN  drop
        !            93:     to history
        !            94:     history file-size throw
        !            95:     2dup forward^ 2! 2dup backward^ 2! end^ 2! ;
        !            96: 
        !            97: : history-cold ( -- )
        !            98:     history-file get-history ;
1.4       pazsan     99: 
1.15      jwilke    100: ' history-cold INIT8 chained
                    101: history-cold
1.4       pazsan    102: 
                    103: \ moving in history file                               16oct94py
                    104: 
                    105: : clear-line ( max span addr pos1 -- max addr )
                    106:   backspaces over spaces swap backspaces ;
                    107: 
                    108: : clear-tib ( max span addr pos -- max 0 addr 0 false )
                    109:   clear-line 0 tuck dup ;
                    110: 
1.7       pazsan    111: : hist-pos    ( -- ud )  history file-position throw ;
                    112: : hist-setpos ( ud -- )  history reposition-file throw ;
1.4       pazsan    113: 
1.7       pazsan    114: : get-line ( addr len -- len' flag )
                    115:   swap history read-line throw ;
                    116: 
1.4       pazsan    117: : next-line  ( max span addr pos1 -- max span addr pos2 false )
                    118:   clear-line
1.7       pazsan    119:   forward^ 2@ 2dup hist-setpos backward^ 2!
                    120:   2dup get-line drop
                    121:   hist-pos  forward^ 2!
                    122:   tuck 2dup type 0 ;
1.4       pazsan    123: 
                    124: : prev-line  ( max span addr pos1 -- max span addr pos2 false )
1.7       pazsan    125:   clear-line  backward^ 2@ forward^ 2!
                    126:   over 2 + negate s>d backward^ 2@ d+ 0. dmax 2dup hist-setpos
                    127:   BEGIN
                    128:       backward^ 2!   2dup get-line  WHILE
                    129:       hist-pos 2dup forward^ 2@ d<  WHILE
                    130:       rot drop
                    131:   REPEAT  2drop  THEN
                    132:   tuck 2dup type 0 ;
1.4       pazsan    133: 
                    134: Create lfpad #lf c,
                    135: 
                    136: : (enter)  ( max span addr pos1 -- max span addr pos2 true )
1.7       pazsan    137:   >r end^ 2@ hist-setpos
                    138:   2dup swap history write-line throw
                    139:   hist-pos 2dup backward^ 2! end^ 2!
1.4       pazsan    140:   r> (ret) ;
                    141: 
                    142: \ some other key commands                              16oct94py
                    143: 
                    144: : first-pos  ( max span addr pos1 -- max span addr 0 0 )
                    145:   backspaces 0 0 ;
                    146: : end-pos  ( max span addr pos1 -- max span addr span 0 )
                    147:   type-rest 2drop over 0 ;
                    148: 
                    149: : extract-word ( addr len -- addr' len' )  dup >r
                    150:   BEGIN  1- dup 0>=  WHILE  2dup + c@ bl =  UNTIL  THEN  1+
                    151:   tuck + r> rot - ;
                    152: 
                    153: Create prefix-found  0 , 0 ,
                    154: 
                    155: : word-lex ( nfa1 nfa2 -- -1/0/1 )
1.9       anton     156:     dup 0=
                    157:     IF
                    158:        2drop 1  EXIT
                    159:     THEN
                    160:     name>string 2>r name>string
                    161:     dup r@ =
                    162:     IF
                    163:        rdrop r> capscomp 0<= EXIT
                    164:     THEN
                    165:     r> <
                    166:     nip rdrop ;
1.4       pazsan    167: 
1.9       anton     168: : search-voc ( addr len nfa1 nfa2 -- addr len nfa3 )
                    169:     >r
                    170:     BEGIN
                    171:        dup
                    172:     WHILE
                    173:        >r dup r@ name>string nip <=
                    174:        IF
                    175:            2dup r@ name>string drop capscomp  0=
                    176:            IF
                    177:                r> dup r@ word-lex
                    178:                IF
                    179:                    dup prefix-found @ word-lex
                    180:                    0>=
                    181:                    IF
                    182:                        rdrop dup >r
                    183:                    THEN
                    184:                THEN
                    185:                >r
1.7       pazsan    186:            THEN
1.9       anton     187:        THEN
                    188:        r> @
                    189:     REPEAT
                    190:     drop r> ;
1.7       pazsan    191: 
                    192: : prefix-string ( addr len nfa -- addr' len' )
                    193:     dup prefix-found !  ?dup
1.9       anton     194:     IF
                    195:        name>string rot /string rot drop
1.7       pazsan    196:        dup 1+ prefix-found cell+ !
                    197:     ELSE
                    198:        2drop s" " prefix-found cell+ off
                    199:     THEN ;
                    200: 
                    201: : search-prefix  ( addr1 len1 -- addr2 len2 )
                    202:     0 vp dup @ 1- cells over +
                    203:     DO  I 2@ <>
                    204:         IF  I cell+ @ @ swap  search-voc  THEN
                    205:        [ -1 cells ] Literal +LOOP
                    206:     prefix-string ;
                    207: 
                    208: : kill-expand ( max span addr pos1 -- max span addr pos2 )
                    209:     prefix-found cell+ @  0 ?DO  (del)  LOOP ;
                    210: 
                    211: : tib-full? ( max span addr pos addr' len' -- max span addr pos addr1 u flag )
                    212:     5 pick over 4 pick + prefix-found @ 0<> - < ;
1.4       pazsan    213: 
                    214: : tab-expand ( max span addr pos1 -- max span addr pos2 0 )
1.7       pazsan    215:     kill-expand  2dup extract-word search-prefix
                    216:     tib-full?
                    217:     IF    7 emit  2drop  0 0 prefix-found 2!
                    218:     ELSE  bounds ?DO  I c@ (ins)  LOOP  THEN
                    219:     prefix-found @ IF  bl (ins)  THEN  0 ;
1.4       pazsan    220: 
                    221: : kill-prefix  ( key -- key )
                    222:   dup #tab <> IF  0 0 prefix-found 2!  THEN ;
                    223: 
                    224: ' kill-prefix IS everychar
                    225: 
                    226: ' next-line  ctrl N cells ctrlkeys + !
                    227: ' prev-line  ctrl P cells ctrlkeys + !
                    228: ' clear-tib  ctrl K cells ctrlkeys + !
                    229: ' first-pos  ctrl A cells ctrlkeys + !
                    230: ' end-pos    ctrl E cells ctrlkeys + !
                    231: ' (enter)    #lf    cells ctrlkeys + !
                    232: ' (enter)    #cr    cells ctrlkeys + !
                    233: ' tab-expand #tab   cells ctrlkeys + !

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