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Annotation of gforth/history.fs, revision 1.5

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