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collapseos/blk/130
Virgil Dupras 9ab5cda397 ed: rename I to i
Shadowing core "I" is too messy. As soon as ed is loaded in memory,
nothing else that isn't "i-aware" can be loaded anymore.

I guess that's why "contexts" exist in Starting Forth, but adding
this concept just for allowing the shadowing of core words seems
overkill to me. Renaming I to i in ed seems better.
2020-06-23 07:08:21 -04:00

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: $f EDPOS @ PREVPOS @ 2DUP = IF 2DROP EXIT THEN
2DUP > IF DUP pos! SWAP THEN
( p1 p2, p1 < p2 ) OVER - 64 MIN ( pos len ) FBUF _zbuf
SWAP _cpos FBUF ( len src dst ) ROT MOVE ;
: $R ( replace mode )
mode! 'R' EMIT
BEGIN setpos KEY DUP BS? IF -1 EDPOS +! DROP 0 THEN
DUP 0x20 >= IF
DUP EMIT EDPOS @ _cpos C! 1 EDPOS +! BLK!! 0
THEN UNTIL mode! SPC contents ;
: $O EDPOS @ 0x3c0 ( 15 * 64 ) >= IF EXIT THEN
_U EDPOS @ 0x3c0 AND DUP pos! _cpos _zbuf BLK!! contents ;
: $o EDPOS @ 64 < IF EXIT THEN EDPOS @ 64 + EDPOS ! $O ;
: $D $H 64 icpy
acc@ 0 DO 16 EDPOS @ 64 / DO I _mvln- LOOP LOOP
BLK!! contents ;