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Annotation of gforth/history.fs, revision 1.2

1.1       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 )
                     10:   2dup r/w open-file 0<
                     11:   IF  drop r/w create-file throw  ELSE  nip nip  THEN
                     12:   to history
                     13:   history file-size throw
                     14:   2dup forward^ 2! 2dup backward^ 2! end^ 2! ;
                     15: 
                     16: s" gforth.history" get-history
                     17: 
                     18: \ moving in history file                               16oct94py
                     19: 
                     20: : clear-line ( max span addr pos1 -- max addr )
                     21:   backspaces over spaces swap backspaces ;
                     22: 
                     23: : clear-tib ( max span addr pos -- max 0 addr 0 false )
                     24:   clear-line 0 tuck dup ;
                     25: 
                     26: : get-line ( max addr -- max span addr pos dpos )
                     27:   history file-position throw  backward^ 2!
                     28:   2dup swap history read-line throw drop
                     29:   2dup type tuck
                     30:   history file-position throw  forward^ 2! ;
                     31: 
                     32: : next-line  ( max span addr pos1 -- max span addr pos2 false )
                     33:   clear-line
                     34:   forward^ 2@ history reposition-file throw
                     35:   get-line  0 ;
                     36: 
                     37: : prev-line  ( max span addr pos1 -- max span addr pos2 false )
                     38:   clear-line over 2 + negate s>d backward^ 2@ d+ 0. dmax
1.2     ! pazsan     39:   2dup history reposition-file throw
        !            40:   BEGIN   2over swap history read-line throw  WHILE
        !            41:           >r history file-position throw
        !            42:          2dup backward^ 2@ d<  WHILE  2swap 2drop rdrop
        !            43:   REPEAT  ELSE  >r history file-position throw  THEN
        !            44:   forward^ 2!  backward^ 2!  r> tuck 2dup type 0 ;
1.1       pazsan     45: 
                     46: : ctrl  ( "<char>" -- ctrl-code )
                     47:   char [char] @ - postpone Literal ; immediate
                     48: 
                     49: Create lfpad #lf c,
                     50: 
                     51: : (enter)  ( max span addr pos1 -- max span addr pos2 true )
                     52:   >r end^ 2@ history reposition-file throw
                     53:   2dup swap history write-file throw
                     54:   lfpad 1 history write-file throw
                     55:   history file-position throw 2dup backward^ 2! end^ 2!
                     56:   r> (ret) ;
                     57: 
                     58: \ some other key commands                              16oct94py
                     59: 
                     60: : first-pos  ( max span addr pos1 -- max span addr 0 0 )
                     61:   backspaces 0 0 ;
                     62: : end-pos  ( max span addr pos1 -- max span addr span 0 )
                     63:   type-rest 2drop over 0 ;
                     64: 
                     65: : extract-word ( addr len -- addr' len' )  dup >r
                     66:   BEGIN  1- dup 0>=  WHILE  2dup + c@ bl =  UNTIL  THEN  1+
                     67:   tuck + r> rot - ;
                     68: 
                     69: Create prefix-found  0 , 0 ,
                     70: 
                     71: : word-lex ( nfa1 nfa2 -- -1/0/1 )
                     72:   dup 0=  IF  2drop 1  EXIT  THEN
                     73:   cell+ >r cell+ count $1F and
                     74:   dup r@ c@ $1F and =
                     75:   IF  r> char+ capscomp 0<=  EXIT  THEN
                     76:   nip r> c@ $1F and < ;
                     77: 
                     78: : search-prefix  ( addr len1 -- suffix len2 )
                     79:   context @ @  0 >r
                     80:   BEGIN  dup  WHILE
                     81:          >r dup r@ cell+ c@ $1F and <=
                     82:         IF  2dup r@ cell+ char+ capscomp  0=
                     83:             IF  r> dup r@ word-lex
                     84:                 IF  dup prefix-found @ word-lex
                     85:                     0>= IF  rdrop dup >r  THEN
                     86:                 THEN >r
                     87:             THEN
                     88:         THEN  r> @
                     89:   REPEAT drop r> dup prefix-found ! ?dup
                     90:   IF    cell+ count $1F and rot /string rot drop
                     91:   ELSE  2drop s" "  THEN  ;
                     92: 
                     93: : tab-expand ( max span addr pos1 -- max span addr pos2 0 )
                     94:   prefix-found cell+ @  0 ?DO  (del)  LOOP
                     95:   2dup extract-word search-prefix
                     96:   dup prefix-found @ 0<> - prefix-found cell+ !
                     97:   bounds ?DO  I c@ (ins)  LOOP
                     98:   prefix-found @ IF  bl (ins)  THEN  0 ;
                     99: 
                    100: : kill-prefix  ( key -- key )
                    101:   dup #tab <> IF  0 0 prefix-found 2!  THEN ;
                    102: 
                    103: ' kill-prefix IS everychar
                    104: 
                    105: ' next-line  ctrl N cells ctrlkeys + !
                    106: ' prev-line  ctrl P cells ctrlkeys + !
                    107: ' clear-tib  ctrl K cells ctrlkeys + !
                    108: ' first-pos  ctrl A cells ctrlkeys + !
                    109: ' end-pos    ctrl E cells ctrlkeys + !
                    110: ' (enter)    #lf    cells ctrlkeys + !
                    111: ' (enter)    #cr    cells ctrlkeys + !
                    112: ' tab-expand #tab   cells ctrlkeys + !