nxu/femto.tal

678 lines
20 KiB
Tal
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( femto.tal )
( )
( requires terminal to be in raw mode )
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( see femto launcher script for more details )
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( )
( ANSI sequences )
( )
( goto $row,$col ESC [ $row ; $col H )
( goto home ESC [ H )
( go up ESC [ A )
( go down ESC [ B )
( go right ESC [ C )
( go left ESC [ D )
( )
( query cursor ESC [ 6 n )
( )
( all scroll on ESC [ r )
( region scroll on ESC [ $y0 ; $y1 r )
( scroll down ESC D )
( scroll up ESC M )
( )
( erase cur->eol ESC [ K )
( erase cur->sol ESC [ 1 K )
( erase line ESC [ 2 K )
( erase line->bot ESC [ J )
( erase line->top ESC [ 1 J )
( erase all ESC [ 2 J )
( )
( set attrs ESC [ $at1 ; ... m )
( reset ESC [ m )
( 0 reset, 1 bright, 2 dim, )
( 4 underscore, 5 blink, )
( 7 reverse, 8 hidden )
( )
( fg (30-37), bg (40-47) )
( black, red, green, yellow, )
( blue, magenta, cyan, white )
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( TODO: )
( - optimize term drawing )
( - get long line truncation/scrolling working )
( - line numbers in left column (toggle mode?) )
( - help text )
( - save file command -> tmp first )
( - open file command? )
( - close file command? )
( - move by word/paragraph )
( - search )
( - search&replace )
( - tab support? )
( - windows line-ending support (CRLF) )
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( FIXME: )
( - stop using bytes for row/col/etc. )
( - consider storing absolute cursor instead )
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|00 @System [ &vector $2 &wst $1 &rst $1 &pad $4 &r $2 &g $2 &b $2 &debug $1 &halt $1 ]
|10 @Console [ &vector $2 &read $1 &pad $5 &write $1 &error $1 ]
|a0 @File [ &vector $2 &success $2 &stat $2 &delete $1 &append $1 &name $2 &length $2 &read $2 &write $2 ]
%dbg { #ff .System/debug DEO }
%emit { .Console/write DEO }
%sp { #2018 DEO }
%nl { #0a18 DEO }
%cr { #0d18 DEO }
%ansi { #1b18 DEO #5b18 DEO }
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%quit! { #01 .System/halt DEO }
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( startup )
|0100 ;startup JMP2
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@startup ;read-filename .Console/vector DEO2 BRK
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( ERROR HANDLING )
( using error! will print the given message before causing )
( the interpreter to halt. )
@error! ( msg* -> )
LIT '! emit sp
&loop LDAk ,&continue JCN ,&done JMP
&continue LDAk emit INC2 ,&loop JMP
&done POP2 nl
dbg BRK
( error messages )
@term-size-parse-error "error 20 "parsing 20 "term 20 "size 00
@rel-line-error "invalid 20 "relative 20 "line 20 "number 00
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@open-file ( filename* -> )
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.File/name DEO2
#8000 .File/length DEO2
;buffer/data .File/read DEO2
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.File/success DEI2 #0000 GTH2 ,&ok JCN
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;messages/input-error ;print JSR2 nl quit!
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( calculate buffer limit address using start + size )
&ok .File/success DEI2 ;buffer/data ADD2 ;buffer/limit STA2
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JMP2r
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@setup-terminal-size ( -> )
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( ;setup-80x24 JSR2 )
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#03e7 #03e7 ;term-move-cursor JSR2
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;term-get-cursor-position JSR2
;tmp/data ;tmp/pos STA2
;receive-terminal-size .Console/vector DEO2
JMP2r
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@receive-terminal-size ( -> )
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.Console/read DEI ;tmp/pos LDA2 STA
;tmp/pos LDA2 INC2 ;tmp/pos STA2
.Console/read DEI LIT 'R EQU ;parse-terminal-size JCN2
BRK
@parse-terminal-size ( -> )
LIT2r 0000 LIT2r 0000
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;tmp/data LDAk #1b NEQ ,&parse-error JCN ( i ) INC2
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LDAk LIT '[ NEQ ,&parse-error JCN ( i ) INC2
&loop
LDAk LIT '; EQU ,&parse-col JCN
LIT2r 000a MUL2r
LDAk LIT '0 SUB #00 SWP STH2 ADD2r
INC2 ,&loop JMP
&parse-col
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INC2 STH2r #0002 SUB2 ;term/rows STA2
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&loop2
LDAk LIT 'R EQU ,&done JCN
LIT2r 000a MUL2r
LDAk LIT '0 SUB #00 SWP STH2 ADD2r
INC2 ,&loop2 JMP
&done
STH2r ;term/cols STA2 POP2
;on-key .Console/vector DEO2
;draw-all JSR2
BRK
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&parse-error POP2 ;tmp/data LDA2
;term-size-parse-error ;error! JMP2
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@setup-linecount ( -> )
;buffer/data LIT2r 0001
&loop DUP2 ;buffer/limit LDA2 EQU2 ,&done JCN
LDAk #00 EQU ,&done JCN
LDAk #0a NEQ JMP INC2r
INC2 ,&loop JMP
&done POP2
STH2r ;buffer/line-count STA2
JMP2r
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@setup-80x24 ( -> )
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#0050 ;term/cols STA2
#0014 ;term/rows STA2
;on-key .Console/vector DEO2
;draw-all JSR2
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JMP2r
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@read-filename ( -> )
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#12 DEI #0a EQU ,&execute JCN ( did we read \n ? )
#12 DEI ;tmp/pos LDA2 STA ( no, so save in buffer )
;tmp/pos LDA2 INC2 ;tmp/pos STA2 ( pos++ )
BRK ( return )
&execute ( we saw a newline, so do something )
#00 ;tmp/pos LDA2 STA ( null terminate str )
;tmp/data ;tmp/pos STA2 ( reset pos )
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;tmp/data ;filename ;str-copy JSR2 ( open file )
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;filename ;open-file JSR2 ( open file )
;setup-linecount JSR2 ( determine # of lines )
;setup-terminal-size JSR2 ( detect terminal dimensions )
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( ;setup-80x24 JSR2 ( hardcoded terminal size ) )
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BRK
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@bol ( -> )
#0000 ;cursor/col STA2
;draw-statusbar JSR2
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;draw-cursor JSR2 BRK
( FIXME: handle long lines )
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@eol ( -> )
;cur-line JSR2 ;line-len JSR2 ;cursor/col STA2
;draw-statusbar JSR2
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;draw-cursor JSR2 BRK
( FIXME: handle long lines )
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@forward ( -> )
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;cur-pos JSR2 ;last-pos JSR2 GTH2 ,&skip JCN
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;cur-col JSR2 ;cur-last JSR2 GTH2 ,&next-line JCN
;cur-col JSR2 INC2 ;cursor/col STA2
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;draw-statusbar JSR2 ;draw-cursor JSR2
,&skip JMP
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&next-line #0000 ;cursor/col STA2
;cursor/row LDA2 INC2 ;cursor/row STA2
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;ensure-visible-cursor JSR2
;draw-cursor JSR2
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&skip BRK
( FIXME: handle long lines )
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@back ( -> )
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;cur-col JSR2 #01 LTH ,&skip JCN
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;cur-col JSR2 #0001 SUB2 ;cursor/col STA2
;draw-statusbar JSR2
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;draw-cursor JSR2
&skip BRK
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@up ( -> )
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;cur-line-num JSR2 #0000 EQU2 ,&done JCN
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;cursor/row LDA2 #0001 LTH2 ,&screen-up JCN
;cursor/row LDA2 #0001 SUB2 ;cursor/row STA2
;draw-statusbar JSR2
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;draw-cursor JSR2 BRK
&screen-up
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;cur-line-num JSR2 #0001 SUB2
;jump-to-line JSR2
;draw-all JSR2
&done BRK
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@down ( -> )
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;cur-abs-row JSR2 ;last-abs-row JSR2 EQU2 ,&done JCN
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;cursor/row LDA2 INC2 ;cursor/row STA2
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;ensure-visible-cursor JSR2
;draw-statusbar JSR2
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;draw-cursor JSR2 BRK
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&done BRK
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@page-up ( -> )
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;bof-is-visible JSR2 ,&near-eof JCN
;buffer/line-offset LDA2
;term/rows LDA2 SUB2 #0003 ADD2
DUP2 ;abs-line JSR2 ;buffer/offset STA2
;buffer/line-offset STA2
;ensure-visible-cursor JSR2
;draw-all JSR2 BRK
&near-eof
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#0000 ;cursor/row STA2
#0000 ;cursor/col STA2
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;draw-cursor JSR2 BRK
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@page-down
;eof-is-visible JSR2 ,&near-eof JCN
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;buffer/line-offset LDA2
;term/rows LDA2 ADD2 #0003 SUB2
DUP2 ;abs-line JSR2 ;buffer/offset STA2
;buffer/line-offset STA2
;ensure-visible-cursor JSR2
;draw-all JSR2 BRK
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&near-eof
;buffer/line-count LDA2
;buffer/line-offset LDA2 INC2
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SUB2 ;cursor/row STA2
;cur-len JSR2 ;cursor/col STA2
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;draw-cursor JSR2 BRK
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@quit quit!
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@ignore BRK
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@insert ( c^ -> )
;cur-pos JSR2 ;shift-right JSR2
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;cur-col JSR2 INC2 ;cursor/col STA2
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;draw-all JSR2
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BRK
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( TODO: handle last line )
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@newline ( c^ -> )
#0a ;cur-pos JSR2 ;shift-right JSR2
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#0000 ;cursor/col STA2
;cursor/row LDA2 INC2 ;cursor/row STA2
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;buffer/line-count LDA2k INC2 SWP2 STA2
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;ensure-visible-cursor JSR2
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;draw-all JSR2
BRK
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@at-buffer-start ( -> bool^ )
;cur-pos JSR2 ;buffer/data EQU2 JMP2r
@at-line-start ( -> bool^ )
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;cursor/col LDA2 #0000 EQU2 JMP2r
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@bof-is-visible ( -> bool^ )
;buffer/line-offset LDA2 #0000 EQU2 JMP2r
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@eof-is-visible ( -> bool^ )
;buffer/line-offset LDA2 ;term/rows LDA2 ADD2 INC2
;buffer/line-count LDA2
GTH2 JMP2r
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@backspace ( -> )
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;at-buffer-start JSR2 ,&skip JCN
;at-line-start JSR2 ,&prev-line JCN
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;cur-col JSR2 #0001 SUB2 ;cursor/col STA2
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,&finish JMP
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&prev-line
;cur-line-num JSR2 #0001 SUB2
;jump-to-line JSR2 ( TODO: fix weird eof behavior )
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;cur-len JSR2 ;cursor/col STA2
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;buffer/line-count LDA2k #0001 SUB2 SWP2 STA2
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&finish
;cur-pos JSR2 ;shift-left JSR2
;draw-all JSR2
&skip BRK
@delete ( -> )
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;last-pos JSR2 #0001 SUB2 ( lst-1 )
;cur-pos JSR2 LTH2 ,&skip JCN
;cur-pos JSR2 LDAk STH ( cur [c] )
;shift-left JSR2 ( [c] )
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STHr #0a NEQ ,&not-newline JCN
;buffer/line-count LDA2k #0001 SUB2 SWP2 STA2
&not-newline ;draw-all JSR2
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&skip BRK
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@escape ( -> )
#01 ;saw-esc STA BRK
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@goto-end ( -> )
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;more-than-one-screen JSR2 ,&large JCN
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;buffer/line-count LDA2 #0001 SUB2 ;cursor/row STA2
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#0000 ,&continue JMP
&large
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;term/rows LDA2 #0001 SUB2 ;cursor/row STA2
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;buffer/line-count LDA2 ;term/rows LDA2 SUB2
&continue
DUP2 ;buffer/line-offset STA2
;abs-line JSR2 ;buffer/offset STA2
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;cur-len JSR2 ;cursor/col STA2
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;draw-all JSR2 BRK
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@goto-start ( -> )
;buffer/data ;buffer/offset STA2
#0000 ;buffer/line-offset STA2
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#0000 ;cursor/col STA2
#0000 ;cursor/row STA2
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;draw-all JSR2
BRK
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@goto-line ( -> )
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#0016 ;jump-to-line JSR2
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;draw-all JSR2 BRK
@jump-to-line ( n* -> )
;term/rows LDA2 #0002 DIV2 LTH2k ( n rows/2 n<rows/2? ) ,&early JCN
OVR2 SWP2 SUB2 ( n n-rows/2 )
;buffer/line-count LDA2 ( n n-rows/2 lines )
;term/rows LDA2 SUB2 ( n n-rows/2 lines-rows )
GTH2k ( n n-rows/2 lines-rows n-rows/2>lines-rows? )
,&late JCN ( n n-rows/2 lines-rows )
POP2 ,&finish JMP
&early ( n rows/2 )
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POP2 #0000 ,&finish JMP ( n 0000 )
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&late ( n n-rows/2 lines-rows )
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NIP2
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&finish ( n o )
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SUB2k STH2 DUP2 ( n o o [n-o] )
;buffer/line-offset STA2 ( n o [n-o] )
;abs-line JSR2 ;buffer/offset STA2 ( n [n-o] )
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#0000 ;cursor/col STA2 ( n [n-o] )
POP2 STH2r ;cursor/row STA2 ( )
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JMP2r
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@ensure-visible-cursor
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;cursor/row LDA2 ;term/rows LDA2 LTH2 ,&noop JCN
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;cur-line-num JSR2 ;jump-to-line JSR2
;draw-all JSR2
&noop JMP2r
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@refresh
;draw-all JSR2 BRK
@debug
;rel-line-error ;error! JMP2
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( TODO: M-f and M-b for next/previous word )
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( M-n and M-p for next/previous paragraph )
( maybe M-% for search&replace )
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@on-key-escaped ( -> )
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#00 ;saw-esc STA
.Console/read DEI LIT '< EQU ( M-< ) ;goto-start JCN2
.Console/read DEI LIT '> EQU ( M-> ) ;goto-end JCN2
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.Console/read DEI LIT 'g EQU ( M-g ) ;goto-line JCN2
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.Console/read DEI LIT 'v EQU ( M-v ) ;page-up JCN2
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BRK
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@move-to-message-line ( -> )
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#0002 ;term/rows LDA2 #0002 ADD2 ;term-move-cursor JSR2 JMP2r
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( TODO: filename prmopt )
@save ( -> )
;buffer/limit LDA2 ;buffer/data SUB2 STH2 ( [size] )
;tmp-file-name .File/name DEO2
STH2kr .File/length DEO2
;buffer/data .File/write DEO2
;move-to-message-line JSR2
.File/success DEI2 STH2r EQU2 ( ok? ) ,&ok JCN
;messages/save-failed ,&finish JMP
&ok ;messages/save-ok
&finish ;print JSR2 BRK
@tmp-file-name "file.tmp 00
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( TODO: C-g or C-h for help )
( TODO: C-s for search )
( TODO: tab input? )
@on-key
;saw-esc LDA ;on-key-escaped JCN2
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.Console/read DEI #01 EQU ( C-a ) ;bol JCN2
.Console/read DEI #02 EQU ( C-b ) ;back JCN2
.Console/read DEI #04 EQU ( C-d ) ;delete JCN2
.Console/read DEI #05 EQU ( C-e ) ;eol JCN2
.Console/read DEI #06 EQU ( C-f ) ;forward JCN2
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.Console/read DEI #0c EQU ( C-l ) ;refresh JCN2
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.Console/read DEI #0d EQU ( \r ) ;newline JCN2
.Console/read DEI #0e EQU ( C-n ) ;down JCN2
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.Console/read DEI #0f EQU ( C-o ) ;save JCN2
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.Console/read DEI #10 EQU ( C-p ) ;up JCN2
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.Console/read DEI #16 EQU ( C-v ) ;page-down JCN2
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.Console/read DEI #18 EQU ( C-x ) ;quit JCN2
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.Console/read DEI #1a EQU ( C-z ) ;debug JCN2
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.Console/read DEI #1b EQU ( ESC ) ;escape JCN2
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.Console/read DEI #7f EQU ( DEL ) ;backspace JCN2
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.Console/read DEI #20 LTH ;ignore JCN2 ( ignore for now )
.Console/read DEI #7e GTH ;ignore JCN2 ( ignore for now )
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.Console/read DEI ( printable ASCII ) ;insert JMP2
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BRK
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@min2 ( x* y* -> min* )
LTH2k JMP SWP2 POP2 JMP2r
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@term-move-cursor ( col* row* -> )
ansi INC2 ( row+1 ) ;emit-dec2 JSR2
LIT '; emit INC2 ( col+1 ) ;emit-dec2 JSR2
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LIT 'H emit JMP2r
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@term-get-cursor-position ( -> )
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ansi LIT '6 emit LIT 'n emit JMP2r
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@term-erase-all ( -> )
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ansi LIT '2 emit LIT 'J emit JMP2r
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@draw-cursor ( -> )
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;cur-col JSR2 ;cur-row JSR2
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;term-move-cursor JSR2 JMP2r
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@draw-statusbar ( -> )
#0000 ;term/rows LDA2 ;term-move-cursor JSR2
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ansi LIT '7 emit LIT 'm emit
LIT2r 2018
;term/cols LDA2 #0000
&loop GTH2k ,&continue JCN ,&done JMP
&continue DEOkr INC2 ,&loop JMP
&done POP2 POP2 POP2r
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#0000 ;term/rows LDA2 ;term-move-cursor JSR2
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;messages/saved ;print JSR2
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;filename ;print JSR2
#20 emit
LIT '[ emit
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;buffer/limit LDA2 ;buffer/data SUB2 ;emit-dec2 JSR2
;messages/bytes ;print JSR2
#20 emit
;buffer/line-count LDA2 ;emit-dec2 JSR2
;messages/lines ;print JSR2
#20 emit
LIT '( emit
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;cur-col JSR2 INC ;emit-dec JSR2
LIT ', emit
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;cur-abs-row JSR2 INC2 ;emit-dec2 JSR2
LIT ') emit
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ansi LIT '0 emit LIT 'm emit
JMP2r
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@draw-all ( -> )
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;term-erase-all JSR2
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#0000 #0000 ;term-move-cursor JSR2
#0001 STH2
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;buffer/offset LDA2
&loop
LDAk #00 EQU ,&eof JCN
LDAk #0a EQU ,&eol JCN
LDAk emit INC2 ,&loop JMP
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&eol INC2r STH2kr ;term/rows LDA2 GTH2 ,&done JCN
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cr nl INC2 ,&loop JMP
&eof
ansi LIT '3 emit LIT '1 emit LIT 'm emit
&eof-loop
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STH2kr ;term/rows LDA2 GTH2 ,&done JCN
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cr nl
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LIT '~ emit INC2r
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,&eof-loop JMP
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&done POP2 POP2r
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ansi LIT '0 emit LIT 'm emit
;draw-statusbar JSR2
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;draw-cursor JSR2
JMP2r
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@str-copy ( src* dst* -> )
STH2 ( src [dst] )
&loop LDAk #00 EQU ,&done JCN
LDAk STH2kr STA
INC2 INC2r ,&loop JMP
&done POP2 #00 STH2r STA
JMP2r
@print ( s* -> )
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&loop LDAk #00 EQU ,&eof JCN
LDAk #18 DEO INC2 ,&loop JMP
&eof POP2 JMP2r
@cur-len ( -> n* )
;cur-line JSR2 ;line-len JSR2 JMP2r
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@cur-last ( -> n* )
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;cur-line JSR2 ;line-len JSR2 #0001 SUB2 JMP2r
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@line-len ( s* -> n* )
#0000 STH2
&loop LDAk #00 EQU ,&end JCN
LDAk #0a EQU ,&end JCN
INC2 INC2r ,&loop JMP
&end POP2 STH2r JMP2r
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@abs-line ( y* -> s* )
#0000 SWP2 SUB2 STH2 ( [-y] )
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;buffer/data ( addr )
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&newline ( addr [-y] )
STH2kr ORA ,&loop JCN ,&done JMP
&loop ( addr [-y] )
LDAk #00 EQU ,&not-found JCN ( addr [-y] )
LDAk #0a EQU ,&found JCN ( addr [-y] )
INC2 ,&loop JMP ( addr+1 [-y] )
&found INC2 INC2r ( addr+1 [-y+1] ) ,&newline JMP
&done POP2r JMP2r
&not-found POP2 POP2r #0000 JMP2r
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( line number relative to the offset, starting at 0 )
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@rel-line ( y* -> s* )
#0000 SWP2 SUB2 STH2 ( [-y] )
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;buffer/offset LDA2 ( addr* )
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STH2kr #0000 EQU2 ,&done JCN ( addr [-y] )
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&newline ( addr [-y] )
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STH2kr ORA ,&loop JCN ,&done JMP
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&loop ( addr [-y] )
LDAk #00 EQU ,&not-found JCN ( addr [-y] )
LDAk #0a EQU ,&found JCN ( addr [-y] )
INC2 ,&loop JMP ( addr+1 [-y] )
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&found INC2 INC2r ( addr+1 [-y+1] ) ,&newline JMP
&done POP2r JMP2r
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&not-found ;rel-line-error ;error! JMP2
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@cur-line ( -> s* )
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;cursor/row LDA2 ;rel-line JSR2 JMP2r
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@cur-line-num ( -> n* )
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;cursor/row LDA2 ;buffer/line-offset LDA2 ADD2 JMP2r
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@cur-pos ( -> s* )
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;cur-line JSR2 ;cur-col JSR2 ADD2 JMP2r
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@cur-abs-row ( -> n* )
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;buffer/line-offset LDA2 ;cursor/row LDA2 ADD2 JMP2r
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@last-abs-row ( -> n* )
;buffer/line-count LDA2 #0001 SUB2 JMP2r
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@shift-right ( c^ addr* -> )
ROT STH ( addr [prev^] )
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;last-pos JSR2 SWP2 ( last addr [prev^] )
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&loop LTH2k ,&done JCN ( last addr [prev^] )
LDAk STH SWPr ( last addr [prev^ curr^] )
DUP2 STHr ( last addr addr prev^ [curr^] )
ROT ROT STA ( last addr [curr^] )
INC2 ,&loop JMP ( last addr+1 [curr^] )
&done NIP2 DUP2 ( addr addr [prev^] )
STHr ROT ROT ( addr prev^ addr )
STA INC2 ( addr+1 )
;buffer/limit STA2 ( )
JMP2r
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( TODO: change last/addr order and GTH -> LTH to remove hack )
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@shift-left ( addr* -> )
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;last-pos JSR2 SWP2 ( last addr )
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&loop GTH2k ,&next JCN ( last addr )
,&done JMP ( last addr )
&next DUP2 INC2 LDAk ( last addr addr+1 c1^ )
STH SWP2 STHr ( last addr+1 addr c1^ )
ROT ROT ( last addr+1 c1^ addr )
STA ,&loop JMP ( last addr+1 )
&done POP2 ( last )
;buffer/limit STA2 ( )
#00 ;buffer/limit LDA2 STA ( ensure null termination )
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JMP2r
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( TODO: should be using cur-col and cur-row almost everywhere )
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( otherwise, bugs! )
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@cur-col ( -> col* )
;cursor/col LDA2 ;cur-len JSR2 ;min2 JSR2 JMP2r
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@cur-row ( -> row* )
;cursor/row LDA2 JMP2r
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@last-pos ( -> addr* )
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;buffer/limit LDA2 #0001 SUB2 JMP2r
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@more-than-one-screen ( -> bool^ )
;buffer/line-count LDA2 ;term/rows LDA2 GTH2 JMP2r
@fits-in-one-screen ( -> bool^ )
;buffer/line-count LDA2 ;term/rows LDA2 INC2 LTH2 JMP2r
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@mod-div ( x^ y^ -> x%d x/y )
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DIVk STHk MUL SUB STHr JMP2r
@mod-div2 ( x^ y^ -> x%d x/y )
DIV2k STH2k MUL2 SUB2 STH2r JMP2r
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( @emit
&short ( s* -> ) SWP ,&byte JSR
&byte ( b^ -> ) DUP #04 SFT ,&nib JSR
&nib ( n^ -> ) #0f AND DUP #09 GTH #27 MUL ADD #30 ADD #18 DEO
JMP2r )
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@emit-digit ( n^ -> )
LIT '0 ADD emit JMP2r
@emit-dec ( n^ -> )
DUP #63 GTH ,&do3 JCN
DUP #09 GTH ,&do2 JCN
,&do1 JMP
&do3 #64 ;mod-div JSR2 ;emit-digit JSR2
&do2 #0a ;mod-div JSR2 ;emit-digit JSR2
&do1 ;emit-digit JSR2 JMP2r
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@emit-dec2 ( n* -> )
DUP2 #270f GTH2 ,&do5 JCN
DUP2 #03e7 GTH2 ,&do4 JCN
DUP2 #0063 GTH2 ,&do3 JCN
DUP2 #0009 GTH2 ,&do2 JCN
,&do1 JMP
&do5 #2710 ;mod-div2 JSR2 NIP ;emit-digit JSR2
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&do4 #03e8 ;mod-div2 JSR2 NIP ;emit-digit JSR2
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&do3 #0064 ;mod-div2 JSR2 NIP ;emit-digit JSR2
&do2 #000a ;mod-div2 JSR2 NIP ;emit-digit JSR2
&do1 NIP ;emit-digit JSR2 JMP2r
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@messages [ &input-error "input 20 "error 00
&bytes 20 "bytes, 00
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&save-ok "saved 00
&save-failed "failed 00
&lines 20 "lines] 00
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&saved "-- 20 00
&unsaved "** 20 00 ]
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@tmp [ &pos :tmp/data
&data $100 ]
@term [ &cols 0050
&rows 0018 ]
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( relative cursor positions, e.g. 0 to cols-1 )
@cursor [ &col 0000 &row 0000 ]
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( did we just see ESC? )
@saw-esc 00
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( )
@filename $80
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( |1ffc )
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( offset is address of the first visible line )
( size is total size of data in bytes )
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@buffer [ &limit 0000
&offset :buffer/data
&line-count 0000
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&line-offset 0000
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&data $8000 ]