\ History file support 16oct94py
0 Value history
2Variable forward^
2Variable backward^
2Variable end^
: get-history ( addr len -- wid )
\ check-file-prefix drop
2dup r/w open-file 0<
IF drop r/w create-file throw ELSE nip nip THEN
to history
history file-size throw
2dup forward^ 2! 2dup backward^ 2! end^ 2! ;
s" ~/.gforth-history" get-history
: history-cold
Defers 'cold
s" ~/.gforth-history" get-history ;
' history-cold IS 'cold
\ moving in history file 16oct94py
: clear-line ( max span addr pos1 -- max addr )
backspaces over spaces swap backspaces ;
: clear-tib ( max span addr pos -- max 0 addr 0 false )
clear-line 0 tuck dup ;
: get-line ( max addr -- max span addr pos dpos )
history file-position throw backward^ 2!
2dup swap history read-line throw drop
2dup type tuck
history file-position throw forward^ 2! ;
: next-line ( max span addr pos1 -- max span addr pos2 false )
clear-line
forward^ 2@ history reposition-file throw
get-line 0 ;
: prev-line ( max span addr pos1 -- max span addr pos2 false )
clear-line over 2 + negate s>d backward^ 2@ d+ 0. dmax
2dup history reposition-file throw
BEGIN 2over swap history read-line throw WHILE
>r history file-position throw
2dup backward^ 2@ d< WHILE 2swap 2drop rdrop
REPEAT ELSE >r history file-position throw THEN
forward^ 2! backward^ 2! r> tuck 2dup type 0 ;
: ctrl ( "<char>" -- ctrl-code )
char [char] @ - postpone Literal ; immediate
Create lfpad #lf c,
: (enter) ( max span addr pos1 -- max span addr pos2 true )
>r end^ 2@ history reposition-file throw
2dup swap history write-file throw
lfpad 1 history write-file throw
history file-position throw 2dup backward^ 2! end^ 2!
r> (ret) ;
\ some other key commands 16oct94py
: first-pos ( max span addr pos1 -- max span addr 0 0 )
backspaces 0 0 ;
: end-pos ( max span addr pos1 -- max span addr span 0 )
type-rest 2drop over 0 ;
: extract-word ( addr len -- addr' len' ) dup >r
BEGIN 1- dup 0>= WHILE 2dup + c@ bl = UNTIL THEN 1+
tuck + r> rot - ;
Create prefix-found 0 , 0 ,
: word-lex ( nfa1 nfa2 -- -1/0/1 )
dup 0= IF 2drop 1 EXIT THEN
cell+ >r cell+ count $1F and
dup r@ c@ $1F and =
IF r> char+ capscomp 0<= EXIT THEN
nip r> c@ $1F and < ;
: search-prefix ( addr len1 -- suffix len2 ) 0 >r context
BEGIN BEGIN dup @ over cell - @ = WHILE cell - REPEAT
dup >r -rot r> @ @
BEGIN dup WHILE >r dup r@ cell+ c@ $1F and <=
IF 2dup r@ cell+ char+ capscomp 0=
IF r> dup r@ word-lex
IF dup prefix-found @ word-lex
0>= IF rdrop dup >r THEN
THEN >r
THEN
THEN r> @
REPEAT drop rot cell - dup vp u> 0=
UNTIL drop r> dup prefix-found ! ?dup
IF cell+ count $1F and rot /string rot drop
ELSE 2drop s" " THEN ;
: tab-expand ( max span addr pos1 -- max span addr pos2 0 )
prefix-found cell+ @ 0 ?DO (del) LOOP
2dup extract-word search-prefix
dup prefix-found @ 0<> - prefix-found cell+ !
bounds ?DO I c@ (ins) LOOP
prefix-found @ IF bl (ins) THEN 0 ;
: kill-prefix ( key -- key )
dup #tab <> IF 0 0 prefix-found 2! THEN ;
' kill-prefix IS everychar
' next-line ctrl N cells ctrlkeys + !
' prev-line ctrl P cells ctrlkeys + !
' clear-tib ctrl K cells ctrlkeys + !
' first-pos ctrl A cells ctrlkeys + !
' end-pos ctrl E cells ctrlkeys + !
' (enter) #lf cells ctrlkeys + !
' (enter) #cr cells ctrlkeys + !
' tab-expand #tab cells ctrlkeys + !
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