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 + !
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