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Annotation of gforth/history.fs, revision 1.7

1.4       pazsan      1: \ History file support                                 16oct94py
                      2: 
                      3: 0 Value history
                      4: 
                      5: 2Variable forward^
                      6: 2Variable backward^
                      7: 2Variable end^
                      8: 
1.7     ! pazsan      9: : force-open ( addr len -- handle )
        !            10:   2dup r/w open-file 0<
        !            11:   IF  drop r/w create-file throw  ELSE  nip nip  THEN ;
        !            12: 
1.4       pazsan     13: : get-history ( addr len -- wid )
1.7     ! pazsan     14:   force-open to history
1.4       pazsan     15:   history file-size throw
                     16:   2dup forward^ 2! 2dup backward^ 2! end^ 2! ;
                     17: 
1.6       anton      18: s" ~/.gforth-history" get-history
1.4       pazsan     19: 
1.6       anton      20: : history-cold
                     21:     Defers 'cold
                     22:     s" ~/.gforth-history" get-history ;
1.4       pazsan     23: 
                     24: ' history-cold IS 'cold
                     25: 
                     26: \ moving in history file                               16oct94py
                     27: 
                     28: : clear-line ( max span addr pos1 -- max addr )
                     29:   backspaces over spaces swap backspaces ;
                     30: 
                     31: : clear-tib ( max span addr pos -- max 0 addr 0 false )
                     32:   clear-line 0 tuck dup ;
                     33: 
1.7     ! pazsan     34: : hist-pos    ( -- ud )  history file-position throw ;
        !            35: : hist-setpos ( ud -- )  history reposition-file throw ;
1.4       pazsan     36: 
1.7     ! pazsan     37: : get-line ( addr len -- len' flag )
        !            38:   swap history read-line throw ;
        !            39: 
1.4       pazsan     40: : next-line  ( max span addr pos1 -- max span addr pos2 false )
                     41:   clear-line
1.7     ! pazsan     42:   forward^ 2@ 2dup hist-setpos backward^ 2!
        !            43:   2dup get-line drop
        !            44:   hist-pos  forward^ 2!
        !            45:   tuck 2dup type 0 ;
1.4       pazsan     46: 
                     47: : prev-line  ( max span addr pos1 -- max span addr pos2 false )
1.7     ! pazsan     48:   clear-line  backward^ 2@ forward^ 2!
        !            49:   over 2 + negate s>d backward^ 2@ d+ 0. dmax 2dup hist-setpos
        !            50:   BEGIN
        !            51:       backward^ 2!   2dup get-line  WHILE
        !            52:       hist-pos 2dup forward^ 2@ d<  WHILE
        !            53:       rot drop
        !            54:   REPEAT  2drop  THEN
        !            55:   tuck 2dup type 0 ;
1.4       pazsan     56: 
                     57: : ctrl  ( "<char>" -- ctrl-code )
                     58:   char [char] @ - postpone Literal ; immediate
                     59: 
                     60: Create lfpad #lf c,
                     61: 
                     62: : (enter)  ( max span addr pos1 -- max span addr pos2 true )
1.7     ! pazsan     63:   >r end^ 2@ hist-setpos
        !            64:   2dup swap history write-line throw
        !            65:   hist-pos 2dup backward^ 2! end^ 2!
1.4       pazsan     66:   r> (ret) ;
                     67: 
                     68: \ some other key commands                              16oct94py
                     69: 
                     70: : first-pos  ( max span addr pos1 -- max span addr 0 0 )
                     71:   backspaces 0 0 ;
                     72: : end-pos  ( max span addr pos1 -- max span addr span 0 )
                     73:   type-rest 2drop over 0 ;
                     74: 
                     75: : extract-word ( addr len -- addr' len' )  dup >r
                     76:   BEGIN  1- dup 0>=  WHILE  2dup + c@ bl =  UNTIL  THEN  1+
                     77:   tuck + r> rot - ;
                     78: 
                     79: Create prefix-found  0 , 0 ,
                     80: 
                     81: : word-lex ( nfa1 nfa2 -- -1/0/1 )
                     82:   dup 0=  IF  2drop 1  EXIT  THEN
                     83:   cell+ >r cell+ count $1F and
                     84:   dup r@ c@ $1F and =
                     85:   IF  r> char+ capscomp 0<=  EXIT  THEN
                     86:   nip r> c@ $1F and < ;
                     87: 
1.7     ! pazsan     88: : search-voc ( addr len nfa1 nfa2 -- addr len nfa3 ) >r
        !            89:     BEGIN  dup  WHILE  >r dup r@ cell+ c@ $1F and <=
        !            90:        IF  2dup r@ cell+ char+ capscomp  0=
        !            91:            IF  r> dup r@ word-lex
        !            92:                IF  dup prefix-found @ word-lex
        !            93:                    0>= IF  rdrop dup >r  THEN
        !            94:                THEN >r
        !            95:            THEN
        !            96:        THEN  r> @
        !            97:     REPEAT drop r> ;
        !            98: 
        !            99: : prefix-string ( addr len nfa -- addr' len' )
        !           100:     dup prefix-found !  ?dup
        !           101:     IF  cell+ count $1F and rot /string rot drop
        !           102:        dup 1+ prefix-found cell+ !
        !           103:     ELSE
        !           104:        2drop s" " prefix-found cell+ off
        !           105:     THEN ;
        !           106: 
        !           107: : search-prefix  ( addr1 len1 -- addr2 len2 )
        !           108:     0 vp dup @ 1- cells over +
        !           109:     DO  I 2@ <>
        !           110:         IF  I cell+ @ @ swap  search-voc  THEN
        !           111:        [ -1 cells ] Literal +LOOP
        !           112:     prefix-string ;
        !           113: 
        !           114: : kill-expand ( max span addr pos1 -- max span addr pos2 )
        !           115:     prefix-found cell+ @  0 ?DO  (del)  LOOP ;
        !           116: 
        !           117: : tib-full? ( max span addr pos addr' len' -- max span addr pos addr1 u flag )
        !           118:     5 pick over 4 pick + prefix-found @ 0<> - < ;
1.4       pazsan    119: 
                    120: : tab-expand ( max span addr pos1 -- max span addr pos2 0 )
1.7     ! pazsan    121:     kill-expand  2dup extract-word search-prefix
        !           122:     tib-full?
        !           123:     IF    7 emit  2drop  0 0 prefix-found 2!
        !           124:     ELSE  bounds ?DO  I c@ (ins)  LOOP  THEN
        !           125:     prefix-found @ IF  bl (ins)  THEN  0 ;
1.4       pazsan    126: 
                    127: : kill-prefix  ( key -- key )
                    128:   dup #tab <> IF  0 0 prefix-found 2!  THEN ;
                    129: 
                    130: ' kill-prefix IS everychar
                    131: 
                    132: ' next-line  ctrl N cells ctrlkeys + !
                    133: ' prev-line  ctrl P cells ctrlkeys + !
                    134: ' clear-tib  ctrl K cells ctrlkeys + !
                    135: ' first-pos  ctrl A cells ctrlkeys + !
                    136: ' end-pos    ctrl E cells ctrlkeys + !
                    137: ' (enter)    #lf    cells ctrlkeys + !
                    138: ' (enter)    #cr    cells ctrlkeys + !
                    139: ' tab-expand #tab   cells ctrlkeys + !