collapseos/blk/104

( Cursor position in buffer. EDPOS/64 is line number )
VARIABLE EDPOS
: _cpos BLK( + ;
: _lpos 64 * _cpos ;
: _pln ( lineno -- )
    DUP _lpos DUP 64 + SWAP DO ( lno )
        I EDPOS @ _cpos = IF '^' EMIT THEN
        I C@ DUP 0x20 < IF DROP 0x20 THEN
        EMIT
    LOOP ( lno )
    1+ . ;
( user-facing lines are 1-based )
: T 1- DUP 64 * EDPOS ! _pln ;