( femto.tal ) ( ) ( requires terminal to be in raw mode ) ( see femto launcher script for more details ) ( ) ( 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 ) ( 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) ) ( FIXME: ) ( - stop using bytes for row/col/etc. ) ( - consider storing absolute cursor instead ) |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 } %quit! { #01 .System/halt DEO BRK } ( zero page ) |0000 @term [ &cols $2 ( zzz ) &rows $2 ( zzz ) &lmargin $2 ( zzz ) ] @config [ &tab-width $2 ( how many spaces to display tab chars ) &insert-tabs $1 ( tab key inserts tabs when true ) &color $2 ( digits of highlight color in reverse order ) ] @buffer [ &limit $2 ( last byte of actual data (not including \0) + 1 ) &offset $2 ( first byte of data visible in terminal ) &line-count $2 ( total number of lines in file ) &line-offset $2 ( first line of text visible in terminal ) ] ( relative cursor positions, e.g. 0 to cols-1 ) @cursor [ &col $2 ( current column value 0-n (may exceed lenght of row) ) &row $2 ( current relative row value, 0-(height-1) ) ] @state [ &saw-esc $1 ( did we just see ESC? ) ] ( prompt uses .tmp/pos and .tmp/data to track user input ) @prompt [ &active $1 ( is prompt currently active? ) &vector $2 ( what code to run when user responds ) &string $20 ( string to print for the prompt ) ] @tmp [ &pos $2 ( temporary pointer to address when reading data ) &data $40 ( small scratch pad when reading data ) ] ( startup ) |0100 ;init-zero-page JSR2 ;startup JMP2 ( intialize zero page variables ) ( ) ( everything not specified starts as zero ) @init-zero-page ( -> ) #0050 .term/cols STZ2 #0018 .term/rows STZ2 #0006 .term/lmargin STZ2 #0004 .config/tab-width STZ2 #01 .config/insert-tabs STZ #3333 .config/color STZ2 ;data .buffer/offset STZ2 JMP2r ( code to run on startup ) @startup ;filename .tmp/pos STZ2 ;read-filename .Console/vector DEO2 BRK ( 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 @open-file ( filename* -> ) .File/name DEO2 #f000 .File/length DEO2 ;data .File/read DEO2 .File/success DEI2 #0000 GTH2 ,&ok JCN ;messages/input-error ;print JSR2 ;filename ;print JSR2 nl quit! ( calculate buffer limit address using start + size ) &ok .File/success DEI2 ;data ADD2 .buffer/limit STZ2 JMP2r @setup-terminal-size ( -> ) ( ;setup-80x24 JMP2 ) #03e7 #03e7 ;term-move-cursor JSR2 ;term-get-cursor-position JSR2 ;tmp/data .tmp/pos STZ2 ;receive-terminal-size .Console/vector DEO2 JMP2r @receive-terminal-size ( -> ) .Console/read DEI .tmp/pos LDZ2 STA .tmp/pos LDZ2 INC2 .tmp/pos STZ2 .Console/read DEI LIT 'R EQU ;parse-terminal-size JCN2 BRK @parse-terminal-size ( -> ) LIT2r 0000 LIT2r 0000 .tmp/data LDZk #1b NEQ ,&parse-error JCN ( i ) INC LDZk LIT '[ NEQ ,&parse-error JCN ( i ) INC &loop LDZk LIT '; EQU ,&parse-col JCN LIT2r 000a MUL2r LDZk LIT '0 SUB #00 SWP STH2 ADD2r INC ,&loop JMP &parse-col INC STH2r #0002 SUB2 .term/rows STZ2 &loop2 LDZk LIT 'R EQU ,&done JCN LIT2r 000a MUL2r LDZk LIT '0 SUB #00 SWP STH2 ADD2r INC ,&loop2 JMP &done STH2r .term/cols STZ2 POP ;on-key .Console/vector DEO2 ;draw-all JSR2 BRK &parse-error POP .tmp/data LDZ2 ;term-size-parse-error ;error! JMP2 @setup-linecount ( -> ) ;data LIT2r 0001 &loop DUP2 .buffer/limit LDZ2 EQU2 ,&done JCN LDAk #00 EQU ,&done JCN LDAk #0a NEQ JMP INC2r INC2 ,&loop JMP &done POP2 STH2r .buffer/line-count STZ2 JMP2r @setup-80x24 ( -> ) #0050 .term/cols STZ2 #0014 .term/rows STZ2 ;on-key .Console/vector DEO2 ;draw-all JSR2 JMP2r @read-filename ( -> ) #12 DEI #0a EQU ,&execute JCN ( did we read \n ? ) #12 DEI .tmp/pos LDZ2 STA ( no, so save in buffer ) .tmp/pos LDZ2 INC2 .tmp/pos STZ2 ( pos++ ) BRK ( return ) &execute ( we saw a newline, so do something ) #00 .tmp/pos LDZ2 STA ( null terminate str ) ;filename ;open-file JSR2 ( open file ) ;setup-linecount JSR2 ( determine # of lines ) ;setup-terminal-size JSR2 ( detect terminal dimensions ) BRK @bol ( -> ) #0000 .cursor/col STZ2 ;draw-statusbar JSR2 ;draw-cursor JSR2 BRK ( FIXME: handle long lines ) @eol ( -> ) ;cur-line JSR2 ;line-len JSR2 .cursor/col STZ2 ;draw-statusbar JSR2 ;draw-cursor JSR2 BRK ( FIXME: handle long lines ) @forward ( -> ) ;cur-pos JSR2 ;last-pos JSR2 GTH2 ,&skip JCN ;cur-col JSR2 ;cur-last JSR2 GTH2 ,&next-line JCN ;cur-col JSR2 INC2 .cursor/col STZ2 ;draw-statusbar JSR2 ;draw-cursor JSR2 ,&skip JMP &next-line #0000 .cursor/col STZ2 ;inc-row JSR2 ;ensure-visible-cursor JSR2 ;draw-cursor JSR2 &skip BRK ( FIXME: handle long lines ) @back ( -> ) ;cur-col JSR2 #01 LTH ,&skip JCN ;cur-col JSR2 #0001 SUB2 .cursor/col STZ2 ;draw-statusbar JSR2 ;draw-cursor JSR2 &skip BRK @up ( -> ) ;cur-abs-row JSR2 #0000 EQU2 ,&done JCN ;cur-rel-row JSR2 #0001 LTH2 ,&screen-up JCN ;dec-row JSR2 ;draw-statusbar JSR2 ;draw-cursor JSR2 BRK &screen-up ;cur-abs-row JSR2 #0001 SUB2 ;jump-to-line JSR2 ;draw-all JSR2 &done BRK @down ( -> ) ;cur-abs-row JSR2 ;last-abs-row JSR2 EQU2 ,&done JCN ;inc-row JSR2 ;ensure-visible-cursor JSR2 ;draw-statusbar JSR2 ;draw-cursor JSR2 BRK &done BRK @page-up ( -> ) ;bof-is-visible JSR2 ,&at-bof JCN .buffer/line-offset LDZ2 .term/rows LDZ2 #0003 SUB2 LTH2k ,&near-bof JCN SUB2 DUP2 ;abs-line JSR2 .buffer/offset STZ2 .buffer/line-offset STZ2 ;ensure-visible-cursor JSR2 ;draw-all JSR2 BRK &near-bof POP2 POP2 ;zero-row JSR2 #0000 .cursor/col STZ2 ;draw-all JSR2 BRK &at-bof ;zero-row JSR2 #0000 .cursor/col STZ2 ;draw-cursor JSR2 BRK @page-down ;eof-is-visible JSR2 ,&near-eof JCN .buffer/line-offset LDZ2 .term/rows LDZ2 ADD2 #0003 SUB2 DUP2 ;abs-line JSR2 .buffer/offset STZ2 .buffer/line-offset STZ2 ;ensure-visible-cursor JSR2 ;draw-all JSR2 BRK &near-eof .buffer/line-count LDZ2 #0001 SUB2 ;set-abs-row JSR2 ;cur-len JSR2 .cursor/col STZ2 ;draw-cursor JSR2 BRK @quit quit! @ignore BRK @insert ( c^ -> ) ;cur-pos JSR2 ;shift-right JSR2 ;cur-col JSR2 INC2 .cursor/col STZ2 ;draw-all JSR2 BRK @insert-tab ( -> ) .config/insert-tabs LDZ ,&use-tabs JCN #0000 .config/tab-width LDZ2 SUB2 &loop DUP2 #0000 EQU2 ,&done JCN #20 ;cur-pos JSR2 ;shift-right JSR2 INC2 ,&loop JMP &done ;cur-col JSR2 .config/tab-width LDZ2 ADD2 .cursor/col STZ2 ;draw-all JSR2 BRK &use-tabs #09 ;insert JMP2 ( TODO: handle last line ) @newline ( c^ -> ) #0a ;cur-pos JSR2 ;shift-right JSR2 #0000 .cursor/col STZ2 ;inc-row JSR2 .buffer/line-count LDZ2k INC2 SWP2 STA2 ;ensure-visible-cursor JSR2 ;draw-all JSR2 BRK @at-buffer-start ( -> bool^ ) ;cur-pos JSR2 ;data EQU2 JMP2r @at-line-start ( -> bool^ ) .cursor/col LDZ2 #0000 EQU2 JMP2r @bof-is-visible ( -> bool^ ) .buffer/line-offset LDZ2 #0000 EQU2 JMP2r @eof-is-visible ( -> bool^ ) .buffer/line-offset LDZ2 .term/rows LDZ2 ADD2 INC2 .buffer/line-count LDZ2 GTH2 JMP2r @backspace ( -> ) ;at-buffer-start JSR2 ,&skip JCN ;at-line-start JSR2 ,&prev-line JCN ;cur-col JSR2 #0001 SUB2 .cursor/col STZ2 ,&finish JMP &prev-line ;cur-abs-row JSR2 #0001 SUB2 ;jump-to-line JSR2 ( TODO: fix weird eof behavior ) ;cur-len JSR2 .cursor/col STZ2 .buffer/line-count LDZ2k #0001 SUB2 SWP2 STA2 &finish ;cur-pos JSR2 ;shift-left JSR2 ;draw-all JSR2 &skip BRK @delete ( -> ) ;last-pos JSR2 #0001 SUB2 ( lst-1 ) ;cur-pos JSR2 LTH2 ,&skip JCN ;cur-pos JSR2 LDAk STH ( cur [c] ) ;shift-left JSR2 ( [c] ) STHr #0a NEQ ,¬-newline JCN .buffer/line-count LDZ2k #0001 SUB2 SWP2 STA2 ¬-newline ;draw-all JSR2 &skip BRK @escape ( -> ) #01 .state/saw-esc STZ BRK @goto-end ( -> ) ;more-than-one-screen JSR2 ,&large JCN .buffer/line-count LDZ2 #0001 SUB2 .cursor/row STZ2 #0000 ,&continue JMP &large .term/rows LDZ2 #0001 SUB2 .cursor/row STZ2 .buffer/line-count LDZ2 .term/rows LDZ2 SUB2 &continue DUP2 .buffer/line-offset STZ2 ;abs-line JSR2 .buffer/offset STZ2 ;cur-len JSR2 .cursor/col STZ2 ;draw-all JSR2 BRK @goto-start ( -> ) ;zero-row JSR2 #0000 .cursor/col STZ2 ;draw-all JSR2 BRK @goto-line ( -> ) #0016 ;jump-to-line JSR2 ;draw-all JSR2 BRK @jump-to-line ( n* -> ) .term/rows LDZ2 #0002 DIV2 LTH2k ( n rows/2 nlines-rows? ) ,&late JCN ( n n-rows/2 lines-rows ) POP2 ,&finish JMP &early ( n rows/2 ) POP2 #0000 ,&finish JMP ( n 0000 ) &late ( n n-rows/2 lines-rows ) NIP2 &finish ( n o ) SUB2k STH2 DUP2 ( n o o [n-o] ) .buffer/line-offset STZ2 ( n o [n-o] ) ;abs-line JSR2 .buffer/offset STZ2 ( n [n-o] ) #0000 .cursor/col STZ2 ( n [n-o] ) POP2 STH2r .cursor/row STZ2 JMP2r @ensure-visible-cursor ;cur-rel-row JSR2 .term/rows LDZ2 LTH2 ,&noop JCN ;cur-abs-row JSR2 ;jump-to-line JSR2 ;draw-all JSR2 &noop JMP2r @refresh ;rel-line-error ;error! JMP2 ( FIXME ) ;draw-all JSR2 BRK @debug ;rel-line-error ;error! JMP2 ( TODO: M-f and M-b for next/previous word ) ( M-n and M-p for next/previous paragraph ) ( maybe M-% for search&replace ) @on-key-escaped ( -> ) #00 .state/saw-esc STZ .Console/read DEI LIT '< EQU ( M-< ) ;goto-start JCN2 .Console/read DEI LIT '> EQU ( M-> ) ;goto-end JCN2 .Console/read DEI LIT 'g EQU ( M-g ) ;goto-line JCN2 .Console/read DEI LIT 'v EQU ( M-v ) ;page-up JCN2 BRK @move-to-message-line ( -> ) #0002 .term/rows LDZ2 #0002 ADD2 ;term-move-cursor JMP2 ( TODO: filename prmopt ) @save ( -> ) .buffer/limit LDZ2 ;data SUB2 STH2 ( [size] ) ;tmp-file-name .File/name DEO2 STH2kr .File/length DEO2 ;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 ( TODO: C-g or C-h for help ) ( TODO: C-s for search ) ( TODO: tab input? ) @on-key .state/saw-esc LDZ ;on-key-escaped JCN2 .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 .Console/read DEI #09 EQU ( \t ) ;insert-tab JCN2 .Console/read DEI #0c EQU ( C-l ) ;refresh JCN2 .Console/read DEI #0d EQU ( \r ) ;newline JCN2 .Console/read DEI #0e EQU ( C-n ) ;down JCN2 .Console/read DEI #0f EQU ( C-o ) ;save JCN2 .Console/read DEI #10 EQU ( C-p ) ;up JCN2 .Console/read DEI #16 EQU ( C-v ) ;page-down JCN2 .Console/read DEI #18 EQU ( C-x ) ;quit JCN2 .Console/read DEI #1a EQU ( C-z ) ;debug JCN2 .Console/read DEI #1b EQU ( ESC ) ;escape JCN2 .Console/read DEI #7f EQU ( DEL ) ;backspace JCN2 .Console/read DEI #20 LTH ;ignore JCN2 ( ignore for now ) .Console/read DEI #7e GTH ;ignore JCN2 ( ignore for now ) .Console/read DEI ( printable ASCII ) ;insert JMP2 BRK @min2 ( x* y* -> min* ) LTH2k JMP SWP2 POP2 JMP2r @max2 ( x* y* -> min* ) GTH2k JMP SWP2 POP2 JMP2r @term-move-cursor ( col* row* -> ) ansi INC2 ( row+1 ) ;emit-dec2 JSR2 LIT '; emit INC2 ( col+1 ) ;emit-dec2 JSR2 LIT 'H emit JMP2r @term-move-right ( n* -> ) ansi ;emit-dec2 JSR2 LIT 'C emit JMP2r @term-get-cursor-position ( -> ) ansi LIT '6 emit LIT 'n emit JMP2r @term-erase-all ( -> ) ansi LIT '2 emit LIT 'J emit JMP2r @draw-cursor ( -> ) ;cur-w-col JSR2 .term/lmargin LDZ2 ADD2 DUP2 .term/cols LDZ2 LTH2 ,&ok JCN ( TODO: handle long line here ) &ok ;cur-rel-row JSR2 ;term-move-cursor JMP2 @draw-statusbar ( -> ) #0000 .term/rows LDZ2 ;term-move-cursor JSR2 ;emit-color-reverse JSR2 LIT2r 2018 .term/cols LDZ2 #0000 &loop GTH2k ,&continue JCN ,&done JMP &continue DEOkr INC2 ,&loop JMP &done POP2 POP2 POP2r #0000 .term/rows LDZ2 ;term-move-cursor JSR2 ;messages/saved ;print JSR2 ;filename ;print JSR2 #20 emit LIT '[ emit .buffer/limit LDZ2 ;data SUB2 ;emit-dec2 JSR2 ;messages/bytes ;print JSR2 #20 emit .buffer/line-count LDZ2 ;emit-dec2 JSR2 ;messages/lines ;print JSR2 #20 emit LIT '( emit ;cur-col JSR2 INC2 ;emit-dec2 JSR2 LIT ', emit ;cur-abs-row JSR2 INC2 ;emit-dec2 JSR2 LIT ') emit ;emit-reset JSR2 JMP2r @draw-linenum ( n* -> ) ;emit-reset JSR2 ansi .config/color LDZ2 emit emit LIT 'm emit ;emit-dec2-pad JSR2 ansi LIT2 'm '0 emit emit JMP2r @emit-tab ( -> ) #0000 .config/tab-width LDZ2 SUB2 LIT2r 2018 &loop ORAk ,&next JCN POP2 POP2r JMP2r &next DEOkr INC2 ,&loop JMP @emit-red ( -> ) ansi LIT '3 emit LIT '1 emit LIT 'm emit JMP2r @emit-reset ( -> ) ansi LIT '0 emit LIT 'm emit JMP2r @emit-red-dollar ( -> ) ;emit-red JSR2 LIT '$ emit ;emit-reset JMP2 @emit-color-reverse ( -> ) ansi .config/color LDZ2 emit emit LIT2 '7 '; emit emit LIT 'm emit JMP2r @draw-all ( -> ) ;term-erase-all JSR2 #0000 #0000 ;term-move-cursor JSR2 .buffer/line-offset LDZ2 STH2 LIT2r 0001 ( [k line-offset] ) .buffer/offset LDZ2 &bol ADD2kr STH2r ;draw-linenum JSR2 .term/lmargin LDZ2 INC2 ,&x STR2 &loop ( offset [k line-offset] ) LDAk #00 EQU ,&eof JCN LDAk #0a EQU ,&eol JCN ,&x LDR2 .term/cols LDZ2 LTH2k ,&ok JCN GTH2 ,&skip JCN ;emit-red-dollar JSR2 ,&x LDR2 INC2 ,&x STR2 &skip INC2 ,&loop JMP &ok POP2 POP2 LDAk #09 EQU ,&do-tab JCN LDAk emit INC2 ,&x LDR2 INC2 ,&x STR2 ,&loop JMP &eol INC2r STH2kr .term/rows LDZ2 GTH2 ,&done JCN cr nl INC2 ,&bol JMP &do-tab ;emit-tab JSR2 INC2 .config/tab-width LDZ2 ,&x LDR2 ADD2 ,&x STR2 ,&loop JMP [ &x $2 ] &eof ;emit-red JSR2 &eof-loop STH2kr .term/rows LDZ2 GTH2 ,&done JCN cr nl .term/lmargin LDZ2 ;term-move-right JSR2 LIT '~ emit INC2r ,&eof-loop JMP &done POP2 POP2r POP2r ;emit-reset JSR2 ;draw-statusbar JSR2 ;draw-cursor JSR2 JMP2r @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* -> ) &loop LDAk #00 EQU ,&eof JCN LDAk #18 DEO INC2 ,&loop JMP &eof POP2 JMP2r @cur-len ( -> n* ) ;cur-line JSR2 ;line-len JMP2 @cur-last ( -> n* ) ;cur-line JSR2 ;line-len JSR2 #0001 SUB2 JMP2r @cur-width ( -> n* ) ;cur-line JSR2 ;line-width JMP2 @cur-w-last ( -> n* ) ;cur-line JSR2 ;line-width JSR2 #0001 SUB2 JMP2r @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 @line-width ( s* -> n* ) #0000 STH2 &loop LDAk #00 EQU ,&done JCN LDAk #0a EQU ,&done JCN LDAk #09 EQU ,&tabs JCN INC2 INC2r ,&loop JMP &tabs #0004 ADD2 ,&loop JMP &done POP2 STH2r JMP2r @abs-line ( y* -> s* ) #0000 SWP2 SUB2 STH2 ( [-y] ) ;data ( addr ) &newline ( addr [-y] ) STH2kr ORA ,&loop JCN ,&done JMP &loop ( addr [-y] ) LDAk #00 EQU ,¬-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 ¬-found POP2 POP2r #0000 JMP2r ( line number relative to the offset, starting at 0 ) @rel-line ( y* -> s* ) #0000 SWP2 SUB2 STH2 ( [-y] ) .buffer/offset LDZ2 ( addr* ) STH2kr #0000 EQU2 ,&done JCN ( addr [-y] ) &newline ( addr [-y] ) STH2kr ORA ,&loop JCN ,&done JMP &loop ( addr [-y] ) LDAk #00 EQU ,¬-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 ¬-found ;rel-line-error ;error! JMP2 @cur-line ( -> s* ) ;cur-rel-row JSR2 ;rel-line JMP2 @cur-pos ( -> s* ) ;cur-line JSR2 ;cur-col JSR2 ADD2 JMP2r @cur-abs-row ( -> n* ) ;cur-rel-row JSR2 .buffer/line-offset LDZ2 ADD2 JMP2r @last-abs-row ( -> n* ) .buffer/line-count LDZ2 #0001 SUB2 JMP2r @shift-right ( c^ addr* -> ) ROT STH ( addr [prev^] ) ;last-pos JSR2 SWP2 ( last addr [prev^] ) &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 STZ2 ( ) JMP2r ( TODO: change last/addr order and GTH -> LTH to remove hack ) @shift-left ( addr* -> ) ;last-pos JSR2 SWP2 ( last addr ) &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 STZ2 ( ) #00 .buffer/limit LDZ2 STA ( ensure null termination ) JMP2r @cur-col ( -> col* ) .cursor/col LDZ2 ;cur-len JSR2 ;min2 JMP2 @cur-w-col ( -> col* ) LIT2r 0000 ( [0] ) ;cur-line JSR2 DUP2 ;cur-col JSR2 ADD2 SWP2 ( lim s [0] ) &loop GTH2k ,&next JCN POP2 POP2 STH2r JMP2r &next LDAk #09 EQU ,&tabs JCN INC2 INC2r ,&loop JMP &tabs INC2 .config/tab-width LDZ2 STH2 ADD2r ,&loop JMP @cur-rel-row ( -> row* ) .cursor/row LDZ2 JMP2r @set-abs-row ( n* -> ) .buffer/line-offset LDZ2 SUB2 .cursor/row STZ2 JMP2r @set-rel-row ( n* -> ) .cursor/row STZ2 JMP2r @zero-row ( -> ) ;data .buffer/offset STZ2 #0000 .buffer/line-offset STZ2 #0000 .cursor/row STZ2 JMP2r @inc-row ( -> ) .cursor/row LDZ2 INC2 .cursor/row STZ2 JMP2r @dec-row ( -> ) .cursor/row LDZ2 #0001 SUB2 .cursor/row STZ2 JMP2r @last-pos ( -> addr* ) .buffer/limit LDZ2 #0001 SUB2 JMP2r @more-than-one-screen ( -> bool^ ) .buffer/line-count LDZ2 .term/rows LDZ2 GTH2 JMP2r @fits-in-one-screen ( -> bool^ ) .buffer/line-count LDZ2 .term/rows LDZ2 INC2 LTH2 JMP2r @mod-div ( x^ y^ -> x%d x/y ) DIVk STHk MUL SUB STHr JMP2r @mod-div2 ( x^ y^ -> x%d x/y ) DIV2k STH2k MUL2 SUB2 STH2r JMP2r @base-10-width ( n* -> w* ) LIT2r 0000 ( n [0] ) &loop ( n [w] ) DUP2 #0000 EQU2 ,&done JCN ( n [w] ) #000a DIV2 ( n/10 [w] ) INC2r ,&loop JMP ( n/10 [w+1] ) &done ( 0 [w] ) POP2 STH2r JMP2r @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 JMP2 @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 &do4 #03e8 ;mod-div2 JSR2 NIP ;emit-digit JSR2 &do3 #0064 ;mod-div2 JSR2 NIP ;emit-digit JSR2 &do2 #000a ;mod-div2 JSR2 NIP ;emit-digit JSR2 &do1 NIP ;emit-digit JMP2 @emit-dec2-pad ( n* -> ) LIT2r 2018 ( preload #20 .Console/write into rst ) DUP2 #270f GTH2 ,&do5 JCN DEOkr DUP2 #03e7 GTH2 ,&do4 JCN DEOkr DUP2 #0063 GTH2 ,&do3 JCN DEOkr DUP2 #0009 GTH2 ,&do2 JCN DEOkr ,&do1 JMP &do5 #2710 ;mod-div2 JSR2 NIP ;emit-digit JSR2 &do4 #03e8 ;mod-div2 JSR2 NIP ;emit-digit JSR2 &do3 #0064 ;mod-div2 JSR2 NIP ;emit-digit JSR2 &do2 #000a ;mod-div2 JSR2 NIP ;emit-digit JSR2 &do1 NIP ;emit-digit JSR2 DEOr JMP2r ( various string constants used as messages for the user ) @messages [ &input-error "input 20 "error: 20 00 &bytes 20 "bytes, 00 &save-ok "saved 00 &save-failed "failed 00 &lines 20 "lines] 00 &saved "-- 20 00 &unsaved "** 20 00 ] @filename $80 ( path to file being edited ) @data $f000 ( actual file data to be edited )