( femto.tal ) ( ) ( requires terminal to be in raw mode ) ( see femto launcher script for more details ) ( TODO: ) ( - dollar ($) and caret (^) regex bug ) ( - get long line truncation/scrolling working ) ( - allow line numbers to be toggled off ) ( - open file command? ) ( - close file command? ) ( - search&replace ) |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 $2 ] ( MAX file size is currently #ce80, i.e. 52864 bytes ) %dbg { #ff .System/debug DEO } %emit { .Console/write DEO } %sp { #2018 DEO } %nl { #0a18 DEO } %cr { #0d18 DEO } %crlf { cr nl } %ansi { #1b18 DEO #5b18 DEO } ( emit macros ) ( ) ( these save one byte and are easier to read. ) %emit-! { LIT2 '! 18 DEO } %emit-$ { LIT2 '$ 18 DEO } %emit-( { LIT2 '( 18 DEO } %emit-) { LIT2 ') 18 DEO } %emit-, { LIT2 ', 18 DEO } %emit-0 { LIT2 '0 18 DEO } %emit-1 { LIT2 '1 18 DEO } %emit-2 { LIT2 '2 18 DEO } %emit-3 { LIT2 '3 18 DEO } %emit-6 { LIT2 '6 18 DEO } %emit-7 { LIT2 '7 18 DEO } %emit-: { LIT2 ': 18 DEO } %emit-; { LIT2 '; 18 DEO } %emit-C { LIT2 'C 18 DEO } %emit-H { LIT2 'H 18 DEO } %emit-J { LIT2 'J 18 DEO } %emit-K { LIT2 'K 18 DEO } %emit-[ { LIT2 '[ 18 DEO } %emit-] { LIT2 '] 18 DEO } %emit-m { LIT2 'm 18 DEO } %emit-n { LIT2 'n 18 DEO } %emit-~ { LIT2 '~ 18 DEO } %quit! { #01 .System/halt DEO BRK } %lmargin { #0006 } ( zero page ) |0000 ( terminal size information ) ( ) ( for now these are constant but eventually we could detect terminal resizes ) @term [ &cols $2 ( relative x coordinate of cursor, from 0 ) &rows $2 ( relative y coordinate of cursor, from 1 ) ] ( configuration settings used when editing ) ( ) ( these can be changed at any time without breaking anything else ) @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 ) ] ( tracks information related to the buffer's view of data ) ( ) ( limit and line-count change when we modify the buffer. ) ( offset and line-offset change when we move the view port. ) @buffer [ &limit $2 ( last byte of actual data (not including \0) + 1 ) &line-count $2 ( total number of lines in file ) &offset $2 ( first byte of data visible in terminal ) &line-offset $2 ( first line of text visible in terminal ) ] ( relative cursor positions, e.g. 0 to cols-1 ) ( ) ( when these change we may need to move the view port as well ) @cursor [ &col $2 ( current column value 0-n (may exceed lenght of row) ) &row $2 ( current relative row value, 0-(height-1) ) ] ( tracks overall editor state between events ) @state [ &in-help $1 ( are we showing help? ) &in-undo $1 ( are we currently in undo? ) &key $1 ( last key read ) &saw-esc $1 ( did we just see ESC? ) &saw-xterm $1 ( did we just see an ESC [ xterm sequence? ) &saw-vt $1 ( did we just see an ESC [ $N vt sequence? ) &redraw $1 ( redrawing: bits determine which parts ) ( 0x01 cursor ) ( 0x02 statusbar ) ( 0x04 prompt ) ( 0x08 matches ) ( 0x10 body and everything else ) &message $1 ( did we just print a message? ) &modified $1 ( has the buffer been modified? ) &quitting $1 ( are we in the process of quitting? ) ] ( 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 $2 ( string to print for the prompt ) ] ( temporary input buffer used for a variety of things ) @tmp [ &pos $2 ( temporary pointer to address when reading data ) &data $80 ( small scratch pad when reading data ) ] ( search uses .tmp/pos and .tmp/data to track query string ) @searching [ &active $1 ( are we displaying search results? ) &orig-row $2 ( row we began the search at ) &orig-col $2 ( col we began the search at ) ®ex $2 ( regex to be stored if any ) &start $2 ( absolute start pos of match ) &end $2 ( absolute limit pos of match ) ] ( startup ) |0100 ( init zero page ) #0050 .term/cols STZ2 #0018 .term/rows STZ2 #0004 .config/tab-width STZ2 #00 .config/insert-tabs STZ #3333 .config/color STZ2 ;data .buffer/offset STZ2 ( start reading the filename from argv ) ;filename .tmp/pos STZ2 ;read-filename .Console/vector DEO2 BRK ( import uxn regex library ) ~regex.tal ( ERROR HANDLING ) ( using error! will print the given message before causing ) ( the interpreter to halt. ) @error! ( msg* -> ) emit-! sp ;print JSR2 nl dbg BRK ( open the given file at editor start up ) ( ) ( this is called during startup by ;read-filename ) ( ) ( TODO: enable closing/opening files with editor already running ) @open-file ( filename* -> ) .File/name DEO2 #ce81 .File/length DEO2 ;data .File/read DEO2 .File/success DEI2 #0000 EQU2 .state/modified STZ .File/success DEI2 #ce81 LTH2 ,&ok JCN crlf ;messages/input-error ;print JSR2 ;filename ;print JSR2 crlf quit! ( calculate buffer limit address using start + size ) &ok .File/success DEI2 ;data ADD2 .buffer/limit STZ2 JMP2r ( ask the terminal for its size ) ( ) ( called during editor initialization by ;read-filename ) ( ) ( TODO: consider supporting terminal resizing ) @setup-terminal-size ( -> ) #03e7 DUP2 ;term-move-cursor JSR2 ;term-get-cursor-position JSR2 ;tmp/data .tmp/pos STZ2 ;receive-terminal-size .Console/vector DEO2 JMP2r ( receive size information from the terminal ) ( ) ( called from Console/vector after ;setup-terminal-size ) @receive-terminal-size ( -> ) .Console/read DEI .state/key STZ .state/key LDZ .tmp/pos LDZ2 STA .tmp/pos LDZ2 INC2 .tmp/pos STZ2 .state/key LDZ LIT 'R EQU ;parse-terminal-size JCN2 BRK ( parse and store terminal size information ) ( ) ( called by ;receive-terminal-size after complete message received ) @parse-terminal-size ( -> ) #0000 ,&acc STR2 .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 :&loop ,&read JMP &parse-col INC ,&acc LDR2 #0002 SUB2 .term/rows STZ2 #0000 ,&acc STR2 &loop2 LDZk LIT 'R EQU ,&done JCN LIT2r :&loop2 ,&read JMP &read LDZk LIT '0 SUB #00 SWP ,&acc LDR2 #000a MUL2 ADD2 ,&acc STR2 INC JMP2r &done ,&acc LDR2 .term/cols STZ2 POP ;on-key .Console/vector DEO2 ;draw-all JSR2 BRK [ &acc $2 ] &parse-error POP .tmp/data LDZ2 ;messages/term-size-parse-error ;error! JMP2 @count-c ( c^ -> n* ) #0000 ,&count STR2 STH ;data &loop LDAk #00 EQU ,&done JCN LDAk STHkr NEQ ,&next JCN ,&count LDR2 INC2 ,&count STR2 &next INC2 ,&loop JMP &done POP2 POPr ,&count LDR2 JMP2r [ &count $2 ] ( save count of number of lines in input file ) ( ) ( this method also detects whether \t characters are used, ) ( and uses this to initialize config/insert-tabs. ) @setup-linecount ( -> ) #0a ;count-c JSR2 INC2 .buffer/line-count STZ2 #09 ;count-c JSR2 #0000 GTH2 .config/insert-tabs STZ JMP2r ( reads filename from the program's argv ) ( ) ( currently femto must be given a file to edit, and reading this ) ( filename is the first thing that happens in ;startup. ) ( ) ( TODO: support other situations, such as: ) ( - launching femto without a file name ) ( - closing the given file and opening a new one ) @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 ( jump to beginning of line ) @bol ( -> ) #0000 .cursor/col STZ2 ;redraw-statusbar-and-cursor JSR2 ;return JMP2 ( jump to beginning of line ) @eol ( -> ) ;cur-len JSR2 .cursor/col STZ2 ;redraw-statusbar-and-cursor JSR2 ;return JMP2 @forward ( -> ) ;go-forward JSR2 ;return JMP2 ( move forward by one character ) @go-forward ( -> ) ;cur-pos JSR2 ;last-pos JSR2 GTH2 ( ;return JCN2 ) ,&noop JCN ;redraw-statusbar-and-cursor JSR2 ;cur-col JSR2 ;cur-len JSR2 LTH2 ,&normal JCN #0000 .cursor/col STZ2 .cursor/row LDZ2 INC2 .cursor/row STZ2 ;ensure-visible-cursor JMP2 &normal ;cur-col JSR2 INC2 .cursor/col STZ2 &noop JMP2r ( move backward by one character ) @back ( -> ) ;go-back JSR2 ;return JMP2 ( internal implementation shared by ;back and ;backspace ) @go-back ( -> ) ;cur-pos JSR2 ;data EQU2 ,&noop JCN ;cur-col JSR2 #0001 LTH2 ,&next-line JCN ;cur-col JSR2 #0001 SUB2 .cursor/col STZ2 ;redraw-statusbar-and-cursor JMP2 &next-line .cursor/row LDZ2k #0001 SUB2 ROT STZ2 ;cur-len JSR2 .cursor/col STZ2 ;ensure-visible-cursor JSR2 ;redraw-statusbar-and-cursor JSR2 &noop JMP2r ( move up by one line ) @up ( -> ) .cursor/row LDZ2 #0000 EQU2 ;return JCN2 .cursor/row LDZ2 #0001 SUB2 .cursor/row STZ2 ;ensure-visible-cursor JSR2 ;redraw-statusbar-and-cursor JSR2 ;return JMP2 ( move down by one line ) @down ( -> ) .cursor/row LDZ2 .buffer/line-count LDZ2 #0001 SUB2 EQU2 ;return JCN2 .cursor/row LDZ2 INC2 .cursor/row STZ2 ;ensure-visible-cursor JSR2 ;redraw-statusbar-and-cursor JSR2 ;return JMP2 @is-word-char ( c^ -> bool^ ) DUP #2f GTH OVR #3a LTH AND STH DUP #40 GTH OVR #5b LTH AND STH ORAr DUP #60 GTH SWP #7b LTH AND STHr ORA JMP2r @not-word-char ( c^ -> bool^ ) ;is-word-char JSR2 #00 EQU JMP2r @forward-by-word ( -> ) ;cur-pos JSR2 &first LDAk #00 EQU ,&done JCN LDAk ;is-word-char JSR2 ,&second JCN INC2 ;go-forward JSR2 ,&first JMP &second LDAk #00 EQU ,&done JCN LDAk ;not-word-char JSR2 ,&done JCN INC2 ;go-forward JSR2 ,&second JMP &done POP2 ;return JMP2 @back-by-word ( -> ) ;cur-pos JSR2 #0001 SUB2 &first DUP2 ;data LTH2 ,&done JCN LDAk ;is-word-char JSR2 ,&second JCN #0001 SUB2 ;go-back JSR2 ,&first JMP &second DUP2 ;data LTH2 ,&done JCN LDAk ;not-word-char JSR2 ,&done JCN #0001 SUB2 ;go-back JSR2 ,&second JMP &done POP2 ;return JMP2 @help #01 .state/in-help STZ ;term-erase-all JSR2 #0000 #0000 ;term-move-cursor JSR2 ;emit-color-bold JSR2 ;help-text ;print JSR2 ;emit-reset JSR2 ;redraw-all JSR2 BRK ( center buffer view on the current line ) @center-view .term/rows LDZ2 INC2 #0002 DIV2 STH2k .cursor/row LDZ2 LTH2 ,&standard JCN POP2r #0000 .buffer/line-offset STZ2 ;data .buffer/offset STZ2 ,&done JMP &standard .cursor/row LDZ2 STH2r SUB2 DUP2 .buffer/line-offset STZ2 ;abs-line JSR2 .buffer/offset STZ2 &done ;redraw-all JSR2 ;return JMP2 ( move up by one page ) @page-up ( -> ) .term/rows LDZ2 #0002 SUB2 STH2k .buffer/line-offset LDZ2 LTH2 ,&move-full JCN POP2r ;zero-row JSR2 #0000 .cursor/col STZ2 ,&done JMP &move-full .cursor/row LDZ2 STH2kr SUB2 .cursor/row STZ2 .buffer/line-offset LDZ2 STH2r SUB2 DUP2 .buffer/line-offset STZ2 ;abs-line JSR2 .buffer/offset STZ2 &done ;redraw-all JSR2 ;return JMP2 ( move down by one page ) @page-down ;eof-is-visible JSR2 ,&near-eof JCN .term/rows LDZ2 #0002 SUB2 STH2k .buffer/line-offset LDZ2 ADD2 DUP2 .buffer/line-offset STZ2 ;abs-line JSR2 .buffer/offset STZ2 .cursor/row LDZ2 STH2r ADD2 .cursor/row STZ2 ;redraw-all JSR2 ;return JMP2 &near-eof .buffer/line-count LDZ2 #0001 SUB2 .cursor/row STZ2 ;cur-len JSR2 .cursor/col STZ2 ;redraw-cursor JSR2 ;return JMP2 ( return true if the end of the file is visible ) @eof-is-visible ( -> bool^ ) .buffer/line-offset LDZ2 .term/rows LDZ2 ADD2 INC2 .buffer/line-count LDZ2 GTH2 JMP2r ( beginning quitting femto, prompting if unsaved changes ) @quit #01 .state/quitting STZ .state/modified LDZ #00 EQU ;quit-now JCN2 ;messages/quit-prompt ;messages/null ;do-quit ;start-prompt JSR2 ;redraw-prompt-and-cursor JSR2 ;return JMP2 ( display two strings on the message line ) ( ) ( often this involves a static messages + an argument like ;tmp/data. ) ( ) ( use messages/null for the second string if only one is needed. ) @send-message ( s1* s2* -> ) #01 .state/message STZ ;move-to-message-line JSR2 SWP2 ;print JSR2 ;print JMP2 ( callback executed in response to the quit prompt. ) @do-quit .tmp/data LDZ LIT 'n EQU ;quit-now JCN2 .tmp/data LDZ LIT 'y EQU ;save JCN2 #00 .state/quitting STZ ;messages/unknown-input ;tmp/data ;send-message JSR2 BRK ( label that calls quit! ) ( ) ( this definition is needed so the address can be used by JCN2. ) @quit-now quit! ( label that calls BRK ) ( ) ( this definition is needed so the address can be used by JCN2. ) @ignore BRK ( insert the given character at the cursor position ) ( ) ( this should not be called for newlines, see ;newline ) @insert ( c^ -> ) ;cur-pos JSR2 ;shift-right JSR2 ;cur-col JSR2 INC2 .cursor/col STZ2 ;redraw-all JSR2 ;return JMP2 ( insert the given character in the prompt ) @insert-prompt ( c^ -> ) .tmp/pos LDZ2 STH2k STA ( data[pos] <- c ) INC2r #00 STH2kr STA ( data[pos+1] <- 0 ) STH2r .tmp/pos STZ2 ( pos <- pos+1 ) ;redraw-prompt-and-cursor JSR2 ;return JMP2 ( insert a tab at the cursor position ) ( ) ( depending on the state of config/insert-tabs this will ) ( either call ;insert with \t or else insert a number of ) ( spaces based on .config/tab-width. ) @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 ;redraw-all JSR2 ;return JMP2 &use-tabs #09 ;insert JMP2 ( insert a newline at the cursor position ) @newline ( c^ -> ) #0a ;cur-pos JSR2 ;shift-right JSR2 #0000 .cursor/col STZ2 .cursor/row LDZ2 INC2 .cursor/row STZ2 .buffer/line-count LDZ2k INC2 ROT STZ2 ;ensure-visible-cursor JSR2 ;redraw-all JSR2 ;return JMP2 ( delete the character to the left of the cursor, if any ) @backspace ( -> ) ;cur-pos JSR2 ;data EQU2 ;return JCN2 ;go-back JSR2 ;delete JMP2 ( delete the last character in the prompt ) @backspace-prompt ( -> ) .tmp/pos LDZ2 ;tmp/data EQU2 ,&skip JCN ( ;return JCN2 ) #00 .tmp/pos LDZ2 #0001 SUB2 ( 0 pos-1 ) STH2k STA ( data[pos-1] <- 0 ) STH2r .tmp/pos STZ2 ( pos <- pos-1 ) &skip ;redraw-prompt-and-cursor JSR2 ;return JMP2 ( delete the character under the cursor, if any ) @delete ( -> ) ;last-pos JSR2 ;cur-pos JSR2 LTH2 ;return JCN2 ;cur-pos JSR2 LDAk STH ( cur [c] ) ;shift-left JSR2 ( [c] ) STHr #0a NEQ ,¬-newline JCN .buffer/line-count LDZ2k #0001 SUB2 ROT STZ2 ¬-newline ;redraw-all JSR2 ;return JMP2 ( used at the start of an escape sequence to set up state. ) ( ) ( many keys such as page-down will actually send an escape character ) ( followed by others. to support these we use saw-esc to interpret ) ( input characters differently. ) ( ) ( see also state/saw-xterm which supports such sequences. ) @escape ( -> ) #01 .state/saw-esc STZ BRK ( move to the end of the file ) @goto-end ( -> ) .buffer/line-count LDZ2 #0001 SUB2 .cursor/row STZ2 .buffer/line-count LDZ2 .term/rows LDZ2 LTH2k ,&use-zero JCN SUB2 #0002 ADD2 ,&continue JMP &use-zero POP2 POP2 #0000 &continue DUP2 .buffer/line-offset STZ2 ;abs-line JSR2 .buffer/offset STZ2 ;cur-len JSR2 .cursor/col STZ2 ;redraw-all JSR2 ;return JMP2 ( move to the start of the file ) @goto-start ( -> ) ;zero-row JSR2 #0000 .cursor/col STZ2 ;redraw-all JSR2 ;return JMP2 ( prompt for a line number and move to that line ) @goto-line ( -> ) ;messages/goto-line ;messages/null ;do-goto-line ;start-prompt JSR2 ;redraw-prompt-and-cursor JSR2 ;return JMP2 ( parse the given string as a decimal number ) ( ) ( returns the number as a short followed by whether parsing was ok ) @parse-decimal-number ( addr* -> n* ok^ ) LDAk ,&non-empty JCN #00 JMP2r &non-empty LIT2r 0000 &loop LDAk ,&continue JCN POP2 STH2r #01 JMP2r &continue LDAk LIT '0 LTH ,&fail JCN LDAk LIT '9 GTH ,&fail JCN LIT2r 000a MUL2r LDAk LIT '0 SUB #00 SWP STH2 ADD2r INC2 ,&loop JMP &fail POP2r #00 JMP2r ( go to the given line number ) ( ) ( this is used as a callback from the goto-line prompt ) @do-goto-line ( n* -> ) ;tmp/data ;parse-decimal-number JSR2 ,&ok JCN ;messages/unknown-input ;tmp/data ;send-message JSR2 ;return JMP2 &ok #0001 SUB2 ( convert 1-indexing to 0-indexing ) DUP2 .buffer/line-count LDZ2 LTH2 ,&within JCN POP2 ;goto-end JMP2 &within ;jump-to-line JSR2 ;redraw-all JSR2 ;return JMP2 ( move the cursor to the given coordinates ) ( ) ( this won't move the display if the given coordinates are visible. ) @move-to-coord ( col* row* -> ) DUP2 ;line-is-visible JSR2 ;jump-to-coord/short JCN2 ;jump-to-coord JMP2 ( move the cursor to the given coordinates ) ( ) ( this will always ensure the display is centered on the given coordinates ) @jump-to-coord ( x* y* -> ) .term/rows LDZ2 INC2 #0002 DIV2 LTH2k ( x y rows/2 ylines-rows? ) ,&late JCN ( x y y-rows/2 lines-rows ) POP2 ,&finish JMP &early ( x y rows/2 ) POP2 #0000 ,&finish JMP ( x y 0000 ) &late ( x y y-rows/2 lines-rows ) NIP2 &finish ( x y o ) ;redraw-all JSR2 SUB2k STH2 DUP2 ( x y o o [y-o] ) .buffer/line-offset STZ2 ( x y o [y-o] ) ;abs-line JSR2 .buffer/offset STZ2 ( x y [y-o] ) POP2r &short ;redraw-statusbar-and-cursor JSR2 .cursor/row STZ2 ( x ) .cursor/col STZ2 JMP2r ( jump to the given line number ) @jump-to-line ( n* -> ) #0000 SWP2 ;jump-to-coord JMP2 ( ensure the cursor is visibe ) ( ) ( if the cursor is not already visible the screen will be ) ( centered on the cursor's coordinates. ) @ensure-visible-cursor .cursor/row LDZ2 .buffer/line-offset LDZ2 SUB2 .term/rows LDZ2 LTH2 ,&noop JCN .cursor/row LDZ2 ;jump-to-line JSR2 ;redraw-all JSR2 &noop JMP2r ( currently used to print stack information. ) @debug ;messages/input-error ;error! JMP2 ( move the terminal's cursor to the message line ) ( ) ( this low level method does not change any editor state (such as ) ( the cursor) but is used to display messages. ) @move-to-message-line ( -> ) #0000 .term/rows LDZ2 #0002 ADD2 ;term-move-cursor JMP2 ( start a prompt on the message line ) ( ) ( the arguments are as follows: ) ( - the prompt string will printed in bold ) ( - the default string will be editable ) ( - the vector address will be used on return ) ( ) ( prompts can always be cancelled using C-g. ) ( ) ( when called vector should end in a BRK instructinon. ) @start-prompt ( prompt* default* vector* -> ) .prompt/active LDZ ,&is-active JCN #01 .prompt/active STZ ( prompt/active <- 1 ) .prompt/vector STZ2 ( prompt/vector <- vector ) ;tmp/data ;str-copy JSR2 ( tmp/data <- default ) ;tmp/data ADD2 .tmp/pos STZ2 ( tmp/pos <- len(default)+data ) .prompt/string STZ2 ( prompt/string <- prompt ) JMP2r &is-active #0000 DIV ( ends prompt without calling vector ) @cancel-prompt ( -> ) #00 .prompt/active STZ #00 .state/quitting STZ ;clear-message-line JSR2 ;redraw-prompt-and-cursor JSR2 ;return JMP2 ( finishes prompt and executes callback ) ( ) ( when called vector should end in a BRK instruction ) @finish-prompt ( -> ) #00 .prompt/active STZ ;clear-message-line JSR2 ;redraw-prompt-and-cursor JSR2 .prompt/vector LDZ2 JMP2 ( begin saving the file, prompting the user for a fiel name ) @save ;messages/save-prompt ;filename ;do-save ;start-prompt JSR2 ;redraw-prompt-and-cursor JSR2 ;return JMP2 ( save the file with the filename found in tmp/data ) @do-save ( -> ) .buffer/limit LDZ2 ;data SUB2 STH2 ( [size] ) ;tmp/data .File/name DEO2 STH2kr .File/length DEO2 ;data .File/write DEO2 .File/success DEI2 STH2r EQU2 ,&ok JCN ;messages/save-failed ,&finish JMP &ok #00 .state/modified STZ ;tmp/data ;filename ;str-copy JSR2 POP2 ;messages/save-ok &finish ;tmp/data ;send-message JSR2 .state/quitting LDZ ;quit-now JCN2 #03 .state/redraw STZ ( FIXME: why do we have to do this? ) ;return JMP2 ( begin a search, prompting for a search string ) @search ( -> ) ;messages/search-prompt ;messages/null ;do-search ;start-prompt JSR2 ;redraw-prompt-and-cursor JSR2 ;return JMP2 ( execute a search, using the given search string ) @do-search ( -> ) .cursor/row LDZ2 .searching/orig-row STZ2 .cursor/col LDZ2 .searching/orig-col STZ2 #0000 .searching/regex STZ2 ;move-to-next-match JSR2 ,&found JCN ;move-to-prev-match JSR2 ,&found JCN ;messages/no-matches-found ;tmp/data ;send-message JSR2 BRK &found #01 .searching/active STZ ;redraw-matches JSR2 ;return JMP2 ( begin a search, prompting for a regular expression ) @regex-search ( -> ) ;messages/regex-search-prompt ;messages/null ;do-regex-search ;start-prompt JSR2 ;redraw-prompt-and-cursor JSR2 ;return JMP2 ( execute a search, using the given regular expressions ) ( ) ( TODO: handle invalid regular expressions that fail to compile ) @do-regex-search ( -> ) ;cur-pos JSR2 DUP2 .searching/start STZ2 .searching/end STZ2 .cursor/row LDZ2 .searching/orig-row STZ2 .cursor/col LDZ2 .searching/orig-col STZ2 ;tmp/data ;compile JSR2 .searching/regex STZ2 ;move-to-next-regex-match JSR2 ,&found JCN ;move-to-prev-regex-match JSR2 ,&found JCN ;messages/no-matches-found ;tmp/data ;send-message JSR2 BRK &found #01 .searching/active STZ ;redraw-matches JSR2 ;return JMP2 ( toggle the color used by the terminal ) ( ) ( available colors are: ) ( - black ) ( - red ) ( - green ) ( - yellow ) ( - blue ) ( - magenta ) ( - cyan ) ( - white ) @toggle-color ( -> ) .config/color LDZ2 #3733 EQU2 ,&wrap-around JCN .config/color LDZ2 #0100 ADD2 .config/color STZ2 ,&done JMP &wrap-around #3033 .config/color STZ2 &done ;redraw-all JSR2 ;return JMP2 ( toggle whether to use literal tab characters ) ( ) ( when opening a file, this defaults to 01 if existing tab ) ( characters are found, and 00 otherwise. ) @toggle-tabs ( -> ) .config/insert-tabs LDZk #00 EQU SWP STZ ;redraw-statusbar-and-cursor JSR2 ;return JMP2 ( interpret user input as an escaped sequence ) ( ) ( called by on-key with state/saw-esc is true ) ( ) ( TODO: maybe M-% for search&replace ) @on-key-escaped ( -> ) #00 .state/saw-esc STZ .state/key LDZ LIT '< EQU ( M-< ) ;goto-start JCN2 .state/key LDZ LIT '> EQU ( M-> ) ;goto-end JCN2 .state/key LDZ LIT 'b EQU ( M-b ) ;back-by-word JCN2 .state/key LDZ LIT 'c EQU ( M-c ) ;toggle-color JCN2 .state/key LDZ LIT 'f EQU ( M-f ) ;forward-by-word JCN2 .state/key LDZ LIT 'g EQU ( M-g ) ;goto-line JCN2 .state/key LDZ LIT 's EQU ( M-s ) ;regex-search JCN2 .state/key LDZ LIT 't EQU ( M-t ) ;toggle-tabs JCN2 .state/key LDZ LIT 'u EQU ( M-u ) ;undo JCN2 .state/key LDZ LIT 'v EQU ( M-v ) ;page-up JCN2 .state/key LDZ LIT '[ EQU ( M-[ ) ;xterm JCN2 BRK ( set our input to expect xterm control sequences ) ( ) ( after seeing ESC followed by [ we expect various ) ( ANSI or xterm control sequences. these include ) ( things like: ) ( - up/down/left/right arrow keys ) ( - page up/page down keys ) ( - end/home keys ) @xterm #01 .state/saw-xterm STZ BRK ( after seeing sequences like "ESC [ 1" we expect ) ( to see a trailing ~ to complete the sequence. ) ( ) ( this callback checks for and if set performs ) ( the relevant action. ) @on-key-vt ( -> ) .state/saw-vt LDZk STH #00 SWP STZ .state/key LDZ LIT '~ EQU ,&ok JCN POPr BRK &ok STHr DUP LIT '1 NEQ ,¬-1 JCN ( ^[[1~ -> home ) POP ;bol JMP2 ¬-1 DUP LIT '2 NEQ ,¬-2 JCN ( ^[[2~ -> insert ) POP BRK ¬-2 DUP LIT '3 NEQ ,¬-3 JCN ( ^[[3~ -> delete ) POP ;delete JMP2 ¬-3 DUP LIT '4 NEQ ,¬-4 JCN ( ^[[4~ -> end ) POP ;eol JMP2 ¬-4 DUP LIT '5 NEQ ,¬-5 JCN ( ^[[5~ -> page up ) POP ;page-up JMP2 ¬-5 DUP LIT '6 NEQ ,¬-6 JCN ( ^[[6~ -> page down ) POP ;page-down JMP2 ¬-6 DUP LIT '7 NEQ ,¬-7 JCN ( ^[[7~ -> home ) POP ;bol JMP2 ¬-7 DUP LIT '8 NEQ ,¬-8 JCN ( ^[[8~ -> end ) POP ;eol JMP2 ¬-8 ( ??? ) POP BRK ( after seeing sequences like "ESC [" we expect ) ( to see more characters to determine the logical key. ) ( ) ( this callback performs the relevant action, ) ( or else sets (or unsets) state as necessary ) ( to continue (or end) the sequence. ) @on-key-xterm ( -> ) #00 .state/saw-xterm STZ .state/key LDZ LIT 'A EQU ( ^[[A -> up ) ;up JCN2 .state/key LDZ LIT 'B EQU ( ^[[B -> down ) ;down JCN2 .state/key LDZ LIT 'C EQU ( ^[[C -> right ) ;forward JCN2 .state/key LDZ LIT 'D EQU ( ^[[D -> left ) ;back JCN2 .state/key LDZ LIT 'F EQU ( ^[[F -> end ) ;eol JCN2 .state/key LDZ LIT 'H EQU ( ^[[H -> home ) ;bol JCN2 .state/key LDZ LIT '0 LTH ;ignore JCN2 .state/key LDZ LIT '8 GTH ;ignore JCN2 .state/key LDZ .state/saw-vt STZ ( ^[[1 through ^[[8 ) BRK ( clear the message line ) ( ) ( this includes the code needed to move the cursor ) ( to that line, the ANSI control sequence to clear ) ( the line, and unsetting state/message. ) ( ) ( if state/message is unset this is a no-op. ) @clear-message-line .state/message LDZ #00 EQU ,&done JCN ;move-to-message-line JSR2 ;term-erase-line JSR2 #00 .state/message STZ &done JMP2r ( cancel the active search ) ( ) ( this method unsets searching/active and also restores ) ( the original cursor position. ) @cancel-search .searching/orig-row LDZ2 ;jump-to-line JSR2 .searching/orig-col LDZ2 .cursor/col STZ2 ,finish-search JMP ( cancel the active search ) ( ) ( this method unsets searching/active. unlike ;cancel-search ) ( this leaves the cursor where it is. ) @finish-search #00 .searching/active STZ ;reset-arena JSR2 ;redraw-all JSR2 ;return JMP2 ( TODO: i haven't decided how to solve the problem of ) ( overlapping matches yet. i don't really want to maintain ) ( a global list of all matches, which means that currently ) ( it can change in response to e.g. cursor position when ) ( matches overlap. ) ( ) ( UPDATE: now that we have searching/start and searching/end ) ( we can use those to resume the search after the full match. ) ( this solves the problem except in some very strange cases ) ( which are quite unlikely. ) ( jump forward to the next match, if any. ) ( ) ( moves the cursor forward to the next match. if there are no ) ( further matches the cursor does not move. ) @jump-to-next-match ( -> ) .searching/regex LDZ2 ORA ,&is-regex JCN ;move-to-next-match JSR2 POP ;return JMP2 &is-regex ;move-to-next-regex-match JSR2 POP ;return JMP2 ( jump backward to the previous match, if any. ) ( ) ( moves the cursor backward to the previous match. if there are ) ( no further matches the cursor does not move. ) @jump-to-prev-match ( -> ) .searching/regex LDZ2 ORA ,&is-regex JCN ;move-to-prev-match JSR2 POP ;return JMP2 &is-regex ;move-to-prev-regex-match JSR2 POP ;return JMP2 ( move to the next substring match. ) ( ) ( called by ;jump-to-next-match. ) @move-to-next-match ( -> ok^ ) .buffer/limit LDZ2 ;cur-pos JSR2 INC2 &loop GTH2k #00 EQU ,&fail JCN DUP2 ;matches-at JSR2 ORA ,&found JCN INC2 ,&loop JMP &found NIP2 ;jump-to-pos JSR2 #01 JMP2r &fail POP2 POP2 #00 JMP2r ( move to the previous substring match. ) ( ) ( called by ;jump-to-prev-match. ) @move-to-prev-match ( -> ok^ ) ;data ;cur-pos JSR2 #0001 SUB2 &loop GTH2k ,&fail JCN DUP2 ;matches-at JSR2 ORA ,&found JCN #0001 SUB2 ,&loop JMP &found NIP2 ;jump-to-pos JSR2 #01 JMP2r &fail POP2 POP2 #00 JMP2r ( move to the next regex match. ) ( ) ( called by ;jump-to-next-match. ) @move-to-next-regex-match ( -> ok^ ) .searching/end LDZ2 .buffer/limit LDZ2 OVR2 GTH2 ,&ok JCN POP2 #00 JMP2r &ok .searching/regex LDZ2 ;rx-search JSR2 ,&found JCN #00 JMP2r &found ;search-end LDA2 .searching/end STZ2 ;search-start LDA2 DUP2 .searching/start STZ2 ;jump-to-pos JSR2 #01 JMP2r ( move to the previous substring match. ) ( ) ( called by ;jump-to-prev-match. ) ( ) ( compared to move-to-next-regex-match this is kind of inefficient. ) ( that's because we have no easy way to search backwards from a point. ) ( ) ( we could do some kind of fancy thing where we search the previous ) ( N bytes, then the 2N bytes before that, etc. ) ( ) ( however, 64K is small enough that just searching from the beginning ) ( and then taking the last match before the cursor works. ) @move-to-prev-regex-match ( -> ok^ ) LITr 00 ;cur-pos JSR2 ;data ( limit pos [res] ) &loop ( limit pos [res] ) GTH2k #00 EQU ,&done JCN ( limit pos ) DUP2 .searching/regex LDZ2 ;rx-search JSR2 ( limit pos match? ) #00 EQU ,&done JCN ( limit pos ) OVR2 ;search-end LDA2 LTH2 ,&done JCN POP2 POPr LITr 01 ;search-start LDA2 .searching/start STZ2 ;search-end LDA2 DUP2 .searching/end STZ2 ,&loop JMP &done POP2 POP2 STHr DUP #00 EQU ,&fail JCN .searching/start LDZ2 ;jump-to-pos JSR2 &fail JMP2r ( on-key event handler to use when searching ) ( ) ( when searching the user can: ) ( - move to the next match (n or C-s) ) ( - move to the previous match (p or C-r) ) ( - end the search leaving the cursor where it is (enter) ) ( - cancel the search restoring the cursor (C-g) ) @on-key-searching .state/key LDZ #07 EQU ( C-g ) ;cancel-search JCN2 .state/key LDZ #08 EQU ( C-h ) ;help JCN2 .state/key LDZ #0d EQU ( \r ) ;finish-search JCN2 .state/key LDZ #12 EQU ( C-r ) ;jump-to-prev-match JCN2 .state/key LDZ #13 EQU ( C-s ) ;jump-to-next-match JCN2 .state/key LDZ #6e EQU ( n ) ;jump-to-next-match JCN2 .state/key LDZ #70 EQU ( p ) ;jump-to-prev-match JCN2 ;ignore JMP2 ( on-key event handler to use when prompt is active ) ( ) ( when the prompt is active the user can: ) ( - append characters to the input string ) ( - delete from the end of the input string (backspace) ) ( - complete the input and act (enter) ) ( - cancel the prompt without action (C-g) ) ( ) ( TODO: currently it's impossible to edit the prompt ) ( except from the end. ideally we'd support most of the ) ( same navigation commands as we do in the buffer, such as ) ( C-a, C-d, etc. however, it's enough extra work to enable ) ( this that for now i haven't done it. ) @on-key-prompt .state/key LDZ #07 EQU ( C-g ) ;cancel-prompt JCN2 .state/key LDZ #08 EQU ( C-h ) ;help JCN2 .state/key LDZ #0d EQU ( \r ) ;finish-prompt JCN2 .state/key LDZ #7f EQU ( DEL ) ;backspace-prompt JCN2 .state/key LDZ #20 LTH ;ignore JCN2 ( ignore for now ) .state/key LDZ #7e GTH ;ignore JCN2 ( ignore for now ) .state/key LDZ ( printable ASCII ) ;insert-prompt JMP2 BRK ( on-key event handler ) ( ) ( this is the "normal" event handler to use for editing ) ( the buffer. it checks various state values to determine ) ( if we're in the midst of a control sequence, if we're ) ( searching or have an active prompt, etc. ) ( ) ( TODO: C-h for help ) ( ) ( you could also imagine building data structures of ) ( commands to unify input strings, help text, callbacks, ) ( and so on. this might ultimately be more efficient but ) ( for now what we have works. ) @on-key #00 .state/in-undo STZ .Console/read DEI .state/key STZ ;clear-message-line JSR2 .state/in-help LDZ #00 .state/in-help STZ ;return JCN2 .searching/active LDZ ;on-key-searching JCN2 .prompt/active LDZ ;on-key-prompt JCN2 .state/saw-vt LDZ ;on-key-vt JCN2 .state/saw-xterm LDZ ;on-key-xterm JCN2 .state/saw-esc LDZ ;on-key-escaped JCN2 .state/key LDZ #01 EQU ( C-a ) ;bol JCN2 .state/key LDZ #02 EQU ( C-b ) ;back JCN2 .state/key LDZ #04 EQU ( C-d ) ;delete JCN2 .state/key LDZ #05 EQU ( C-e ) ;eol JCN2 .state/key LDZ #06 EQU ( C-f ) ;forward JCN2 .state/key LDZ #08 EQU ( C-h ) ;help JCN2 .state/key LDZ #09 EQU ( \t ) ;insert-tab JCN2 .state/key LDZ #0c EQU ( C-l ) ;center-view JCN2 .state/key LDZ #0d EQU ( \r ) ;newline JCN2 .state/key LDZ #0e EQU ( C-n ) ;down JCN2 .state/key LDZ #0f EQU ( C-o ) ;save JCN2 .state/key LDZ #10 EQU ( C-p ) ;up JCN2 .state/key LDZ #13 EQU ( C-s ) ;search JCN2 .state/key LDZ #16 EQU ( C-v ) ;page-down JCN2 .state/key LDZ #18 EQU ( C-x ) ;quit JCN2 .state/key LDZ #1a EQU ( C-z ) ;debug JCN2 .state/key LDZ #1b EQU ( ESC ) ;escape JCN2 .state/key LDZ #7f EQU ( DEL ) ;backspace JCN2 .state/key LDZ #20 LTH ;ignore JCN2 ( ignore for now ) .state/key LDZ #7e GTH ;ignore JCN2 ( ignore for now ) .state/key LDZ ( printable ASCII ) ;insert JMP2 ( return the smaller of two short values ) @min2 ( x* y* -> min* ) LTH2k JMP SWP2 POP2 JMP2r ( method to add bits to the redraw register ) ( ) ( state/redraw uses 8 bits to represent which parts ) ( of the screen (if any) should be redrawn. this method ) ( uses logical-or (ORA) to add the bits of n to those ) ( already set. ) @redraw-add ( n^ -> ) .state/redraw LDZk ROT ORA SWP STZ JMP2r ( various redrawing methods ) ( ) ( these don't perform a redraw right away, but instead ) ( signal that the next drawing should include that part. ) @redraw-cursor ( -> ) #01 ,redraw-add JMP @redraw-statusbar-and-cursor ( -> ) #03 ,redraw-add JMP @redraw-prompt-and-cursor ( -> ) #05 ,redraw-add JMP @redraw-matches ( -> ) #08 ,redraw-add JMP @redraw-all ( -> ) #1f ,redraw-add JMP ( draw the current cursor location ) @draw-cursor ( -> ) .prompt/active LDZ #00 EQU JMP JMP2r ( TODO: handle long lines ) ;cur-w-col JSR2 lmargin ADD2 .cursor/row LDZ2 .buffer/line-offset LDZ2 SUB2 ;term-move-cursor JMP2 ( current column in terms of display width ) ( ) ( this is different than ;cur-col due to tabs ) @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 ( move the terminal cursor to the statusbar line ) @move-to-statusbar ( -> ) #0000 .term/rows LDZ2 ;term-move-cursor JMP2 ( draw the full statusbar ) @draw-statusbar ( -> ) ;move-to-statusbar JSR2 ;emit-color-reverse JSR2 LIT2r 2018 .term/cols LDZ2 #0001 ( cols i [2018] ) &loop LTH2k ,&done JCN DEOkr INC2 ,&loop JMP &done POP2 POP2 POP2r ( ) ;move-to-statusbar JSR2 ( display ** if the buffer has unsaved changes, -- otherwise ) #2d .state/modified LDZ #00 NEQ #03 MUL SUB DUP emit emit sp ;filename ;print JSR2 sp emit-[ .buffer/limit LDZ2 ;data SUB2 ;emit-dec2 JSR2 ;messages/bytes ;print JSR2 sp .buffer/line-count LDZ2 ;emit-dec2 JSR2 ;messages/lines ;print JSR2 sp emit-( ;cur-col JSR2 INC2 ;emit-dec2 JSR2 emit-, .cursor/row LDZ2 INC2 ;emit-dec2 JSR2 emit-) sp emit-[ LIT 's .config/insert-tabs LDZ ADD emit emit-] sp ;messages/help-msg ;print JSR2 ;emit-reset JMP2 @draw-prompt ( -> ) ;clear-message-line JSR2 .prompt/active LDZ ,&is-active JCN JMP2r &is-active #01 .state/message STZ ;move-to-message-line JSR2 ;emit-color-bold JSR2 .prompt/string LDZ2 ;print JSR2 ;emit-reset JSR2 ;tmp/data ;print JSR2 JMP2r @draw-linenum ( n* -> ) ;emit-reset JSR2 ;emit-color JSR2 ;emit-dec2-pad JSR2 sp ;emit-reset JMP2 @matches-at ( s* -> limit* ) LIT2r :tmp/data &loop LDAkr STHr #00 EQU ,&done JCN LDAk LDAkr STHr NEQ ,&fail JCN INC2 INC2r ,&loop JMP &fail POP2 #0000 &done POP2r JMP2r ( TODO: this doesn't handle tabs correctly ) @draw-region ( offset* limit* col* row* -> ) OVR2 ( offset limit col row col ) .term/cols LDZ2 SWP2 SUB2 STH2 ( offset limit col row [cols-col] ) ;term-move-cursor JSR2 ( offset limit [cols-col] ) OVR2 STH2r ADD2 ( offset limit offset+cols-col ) ;min2 JSR2 STH2 ( offset [cutoff] ) &loop ( i [cutoff] ) DUP2 STH2kr LTH2 #00 EQU ,&done JCN LDAk #00 EQU ,&done JCN LDAk #18 DEO INC2 ,&loop JMP &done POP2 POP2r JMP2r @screen-limit ( -> sc-limit* ) .term/rows LDZ2 .buffer/line-offset LDZ2 ADD2 ( row0+rows ) DUP2 .buffer/line-count LDZ2 LTH2 ,¬-end JCN POP2 .buffer/limit LDZ2 JMP2r ¬-end ;abs-line JMP2 @draw-regex-matches ( -> ) ;emit-color-reverse JSR2 ( ) ;screen-limit JSR2 .buffer/offset LDZ2 ( limit pos ) &loop ( limit pos ) GTH2k #00 EQU ( limit pos limit>pos=0? ) ,&done JCN ( limit pos ) DUP2 .searching/regex LDZ2 ( limit pos pos rx ) ;rx-search JSR2 #00 EQU ( limit pos found=0? ) ,&done JCN ( limit pos ) POP2 ;search-start LDA2 ( limit start ) GTH2k #00 EQU ( limit start limit>start=0? ) ,&done JCN ( limit start ) ;search-end LDA2 OVR2 ( limit start end start ) ;pos-to-row-col JSR2 ( limit start end row col ) lmargin ADD2 ( limit start end row col+lm ) SWP2 .buffer/line-offset LDZ2 SUB2 ( limit start end col+lm row-lo ) ;draw-region JSR2 ( limit ) ;search-end LDA2 ( limit end ) ,&loop JMP &done ( limit pos ) POP2 POP2 JMP2r @draw-matches ( -> ) ( return if not searching ) .searching/active LDZ #00 EQU ,&return JCN ( ) .searching/regex LDZ2 ORA ;draw-regex-matches JCN2 ;emit-color-reverse JSR2 lmargin ,&x STR2 #0000 ,&y STR2 ( x <- 0, y <- 0 ) .buffer/offset LDZ2 DUP2 ;screen-limit JSR2 SUB2 STH2 ( offset [-count] ) &loop ( offset [-count] ) STH2kr #0000 EQU2 ,&done JCN DUP2 ;matches-at JSR2 ( offset mlim [-count] ) DUP2 ORA ,&found JCN POP2 ( offset [-count] ) LDAk #0a EQU ,&newline JCN #0001 ,&next JMP ( offset n [-count] ) &found ( offset mlim [-count] ) STH2k ( offset mlim [mlim -count] ) OVR2 SWP2 ,&x LDR2 ,&y LDR2 ( offset offset mlim x y [mlim -count] ) ;draw-region JSR2 ( offset [mlim -count] ) STH2r ( offset mlim [-count] ) OVR2 SUB2 ( offset mlim-offset [-count] ) &next ( offset n [-count] ) DUP2 ,&x LDR2 ADD2 ,&x STR2 ( offset n [-count ) STH2k ( offset n [n -count] ) ADD2 ADD2r ( offset+n [n-count] ) ,&loop JMP &newline ( offset [-count] ) lmargin ,&x STR2 ,&y LDR2 INC2 ,&y STR2 INC2 INC2r ,&loop JMP &done POP2 POP2r ;emit-reset JSR2 &return JMP2r [ &x $2 &y $2 ] @emit-tab ( -> ) #0000 .config/tab-width LDZ2 SUB2 LIT2r 2018 &loop ORAk ,&next JCN POP2 POP2r JMP2r &next DEOkr INC2 ,&loop JMP ( ANSI terminal notes ) ( ) ( attrs [0-7] ) ( reset, bright, dim, underscore, ) ( blink, ???, reverse, hidden ) ( ) ( fg [30-37], bg [40-47] ) ( black, red, green, yellow, ) ( blue, magenta, cyan, white ) ( ANSI control sequence to move the cursor to the given coord ) ( ESC [ $row ; $col H ) @term-move-cursor ( col* row* -> ) ansi INC2 ( row+1 ) ;emit-dec2 JSR2 emit-; INC2 ( col+1 ) ;emit-dec2 JSR2 emit-H JMP2r ( ANSI control sequence to move N positions right ) ( ESC [ $n C ) @term-move-right ( n* -> ) ansi ;emit-dec2 JSR2 emit-C JMP2r ( ANSI control sequence to get the cursor position ) ( ESC [ 6 n ) @term-get-cursor-position ( -> ) LIT2 00 'n LIT '6 ,ansi-emit JMP ( ANSI control sequence to erase entire screen ) ( ESC [ 2 J ) @term-erase-all ( -> ) LIT2 00 'J LIT '2 ,ansi-emit JMP ( ANSI control sequence to erase the current line ) ( ESC [ 2 K ) @term-erase-line ( -> ) LIT2 00 'K LIT '2 ,ansi-emit JMP @ansi-emit ( 00 cn ... c1 c0 -> ) LITr 18 ( Console/write ) #5b1b STHkr DEO STHkr DEO ( ESC [ ) &loop DUP ,&next JCN POP POPr JMP2r &next STHkr DEO ,&loop JMP ( ESC [ 3 1 m ) @emit-red ( -> ) LIT2 00 'm LIT2 '1 '3 ,ansi-emit JMP ( ESC [ 0 m ) @emit-reset ( -> ) #00 LIT2 'm '0 ,ansi-emit JMP ( ESC [ 1 m $ ESC [ 0 m ) @emit-red-dollar ( -> ) ,emit-red JSR emit-$ ,emit-reset JMP2 ( ESC [ 3 $x ; 7 m ) ( $x is 0-7 ) @emit-color-reverse ( -> ) LIT2 00 'm LIT2 '7 '; .config/color LDZ2 ,ansi-emit JMP @emit-color ( -> ) LIT2 00 'm .config/color LDZ2 ,ansi-emit JMP ( ESC [ 3 $x ; 1 m ) ( $x is 0-7 ) @emit-color-bold ( -> ) LIT2 00 'm LIT2 '1 '; .config/color LDZ2 ,ansi-emit JMP @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 lmargin 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 crlf 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 crlf lmargin ;term-move-right JSR2 emit-~ INC2r ,&eof-loop JMP &done POP2 POP2r POP2r ;emit-reset JSR2 ;draw-matches JSR2 ;draw-statusbar JSR2 ;draw-prompt JSR2 ;draw-cursor JMP2 ( handler completion code to do necessary drawing and BRK ) @return ( -> ) .state/redraw LDZ DUP #10 AND ,&draw-all JCN DUP #08 AND ,&do-8 JCN ,&skip-8 JMP &do-8 ;draw-matches JSR2 &skip-8 DUP #04 AND ,&do-4 JCN ,&skip-4 JMP &do-4 ;draw-prompt JSR2 &skip-4 DUP #02 AND ,&do-2 JCN ,&skip-2 JMP &do-2 ;draw-statusbar JSR2 &skip-2 DUP #01 AND ,&do-1 JCN ,&finish JMP &do-1 ;draw-cursor JSR2 ,&finish JMP &draw-all ;draw-all JSR2 &finish POP #00 .state/redraw STZ BRK @str-copy ( src* dst* -> len* ) STH2 DUP2 ( src src [dst] ) &loop LDAk #00 EQU ,&done JCN LDAk STH2kr STA INC2 INC2r ,&loop JMP &done ( src src+n [dst+n] ) SWP2 SUB2 #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 @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-is-visible ( n* -> bool^ ) .buffer/line-offset LDZ2 LTH2k ,&no JCN .term/rows LDZ2 ADD2 LTH2 JMP2r &no POP2 POP2 #00 JMP2r @jump-to-pos ( s* -> ) ;pos-to-row-col JSR2 SWP2 ;move-to-coord JMP2 @pos-to-row-col ( s* -> row* col* ) #0000 ,&row STR2 #0000 ,&col STR2 ;data &loop ( s pos ) GTH2k #00 EQU ,&done JCN LDAk #0a EQU ,&newline JCN ,&col LDR2 INC2 ,&col STR2 INC2 ,&loop JMP &newline #0000 ,&col STR2 ,&row LDR2 INC2 ,&row STR2 INC2 ,&loop JMP &done POP2 POP2 ,&row LDR2 ,&col LDR2 JMP2r [ &row $2 &col $2 ] ( counts y lines forward from the given address ) @line-to-pos ( addr* y* -> s* ) #0000 SWP2 SUB2 STH2 ( 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 ,&newline JMP &done POP2r JMP2r ¬-found POP2 POP2r #0000 JMP2r ( find string pointer for absolute y coordinate ) @abs-line ( y* -> s* ) ;data SWP2 ;line-to-pos JMP2 ( return a pointer to the current line ) @cur-line ( -> s* ) .cursor/row LDZ2 .buffer/line-offset LDZ2 LTH2k ,&early JCN ( if cursor/row is later than line-offset ) ( we can save some time by starting at ) ( buffer/offset instead of the beginning ) SUB2 .buffer/offset LDZ2 SWP2 ;line-to-pos JMP2 &early ( if cursor/row is earlier than line-offset ) ( we need to use the absolute y coordinate ) POP2 ;abs-line JMP2 ( return a pointer to the current cursor position ) @cur-pos ( -> s* ) ;cur-line JSR2 ;cur-col JSR2 ADD2 JMP2r ( insert one character at the cursor position ) @shift-right ( c^ addr* -> ) #01 .state/modified STZ ROT STH ( addr [prev^] ) ;last-pos JSR2 SWP2 ( last addr [prev^] ) .state/in-undo LDZ ,&loop JCN STH2k #00 STH2r ;u-push JSR2 &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 ( remove one character at the cursor position ) ( ) ( TODO: change last/addr order and GTH -> LTH to remove hack ) @shift-left ( addr* -> ) #01 .state/modified STZ ;last-pos JSR2 SWP2 ( last addr ) .state/in-undo LDZ ,&loop JCN STH2k ;cur-pos JSR2 LDA STH2r ;u-push JSR2 &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 ( current column in terms of bytes in buffer ) @cur-col ( -> col* ) .cursor/col LDZ2 ;cur-len JSR2 ;min2 JMP2 ( jump to the first line in the buffer ) @zero-row ( -> ) ;data .buffer/offset STZ2 #0000 .buffer/line-offset STZ2 #0000 .cursor/row STZ2 JMP2r ( return the location of the last character in the buffer ) @last-pos ( -> addr* ) .buffer/limit LDZ2 #0001 SUB2 JMP2r ( emit a short as a decimal ) @emit-dec2 ( n* -> ) LITr 00 ( n [0] ) &read ( n [k] ) #000a DIV2k STH2k MUL2 SUB2 STH2r INCr ( n%10 n/10 [k+1] ) DUP2 ORA ,&read JCN POP2 ( top element was 0000 ) &write ( n0 n1 ... nk [k+1] ) NIP #30 ADD #18 DEO LITr 01 SUBr ( n0 ... n{k-1} [k] ) STHkr ,&write JCN POPr JMP2r ( emit a short as a decimal with leading spaces ) @emit-dec2-pad ( n* -> ) LITr 00 ( n [0] ) &read ( n [k] ) #000a DIV2k STH2k MUL2 SUB2 STH2r INCr ( n%10 n/10 [k+1] ) STHkr #05 LTH ,&read JCN POP2 ( top element was 0000 ) &write0 ( n0 n1 ... nk [k+1] ) DUP2 ORA ,emit-dec2/write JCN POP2 sp LITr 01 SUBr STHkr ,&write0 JCN POPr JMP2r ( various string constants used as messages for the user ) @messages [ &null 00 &input-error "Input 20 "error, 20 "file 20 "too 20 "large: 20 00 &bytes 20 "bytes, 00 &save-ok "Successfully 20 "saved 20 00 &save-failed "Failed 20 "to 20 "save 20 00 &lines 20 "lines] 00 &goto-line "Go 20 "to 20 "line: 20 00 &save-prompt "File 20 "Name 20 "to 20 "Write: 20 00 &search-prompt "Text 20 "to 20 "Search 20 "for: 20 00 ®ex-search-prompt "Regex 20 "to 20 "Search 20 "for: 20 00 &quit-prompt "Save 20 "modified 20 "file 20 "(y/n)? 20 00 &unknown-input "Unknown 20 "input: 20 00 &no-matches-found "No 20 "matches 20 "found: 20 00 &term-size-parse-error "Error 20 "parsing 20 "term 20 "size 00 &help-msg "(help: 20 "C-h) 00 ] @help-text 09 "femto 20 "input 20 "reference 09 "(C 20 "is 20 "Ctrl, 20 "M 20 "is 20 "Meta/Alt ") 0d 0a 0d 0a 09 "quit 09 09 "C-x 09 09 "cancel 09 09 "C-g 0d 0a 09 "save 09 09 "C-o 09 09 "undo 09 09 "C-u 0d 0a 0d 0a 09 "move 20 "up 09 09 "C-p 20 "(up) 09 "page 20 "up 09 09 "M-v 20 "(pg-up) 0d 0a 09 "move 20 "down 09 "C-n 20 "(down) 09 "page 20 "down 09 "C-v 20 "(pg-dn) 0d 0a 09 "move 20 "left 09 "C-b 20 "(left) 09 "line 20 "start 09 "C-a 20 "(home) 0d 0a 09 "move 20 "right 09 "C-f 20 "(right) 09 "line 20 "end 09 "C-e 20 "(end) 0d 0a 0d 0a 09 "goto 20 "file 20 "start 09 "M-< 09 09 "left 20 "by 20 "word 09 "M-b 0d 0a 09 "goto 20 "file 20 "end 09 "M-> 09 09 "right 20 "by 20 "word 09 "M-f 0d 0a 09 "goto 20 "line 09 "M-g 09 09 "center 20 "cursor 09 "C-l 0d 0a 0d 0a 09 "search 09 09 "C-s 09 09 "toggle 20 "colors 09 "M-c 0d 0a 09 "regex 20 "search 09 "M-s 09 09 "toggle 20 "tabs 09 "M-t 0d 0a 09 "next 20 "match 09 "C-s 20 "(n) 0d 0a 09 "prev 20 "match 09 "C-r 20 "(p) 0d 0a 09 "end 20 "search 09 "enter 0d 0a 09 "cancel 20 "search 09 "C-g 0d 0a 0d 0a 09 09 09 "press 20 "any 20 "key 20 "to 20 "continue... 0d 0a 00 ( perform the undo action ) @undo ( -> ) #01 .state/in-undo STZ ;undo-stack/pos LDA2 ;undo-stack/data EQU2 ,&noop JCN ;undo-stack/pos LDA2 #0003 SUB2 DUP2 ;undo-stack/pos STA2 LDA2k STH2 ( pos [addr] ) INC2 INC2 LDA STH2r ( c addr ) ;jump-to-pos JSR2 DUP #00 EQU ,&delete JCN DUP #0a EQU ,&newline JCN DUP #09 EQU ,&tab JCN ;insert JMP2 &newline POP ;newline JMP2 &tab POP ;insert-tab JMP2 &delete POP ;delete JMP2 &noop BRK ( free up space in the undo stack by evicting the oldest entry ) @u-free ( -> ) ;undo-stack/data STH2k #0003 ADD2 ( st+3 [st] ) &loop LDAk STH2kr STA INC2 INC2r DUP2 ;undo-stack/pos LDA2 LTH2 ,&loop JCN ;undo-stack/pos LDA2k #0003 SUB2 SWP2 STA2 POP2 POP2r JMP2r ( push a new item on the undo stack ) @u-push ( c^ addr* -> ) ;undo-stack/pos DUP2 LDA2 ( c^ addr* top* pos* ) GTH2 ( c^ addr* top>pos^ ) ,&has-room JCN ( c^ addr* ) ;u-free JSR2 &has-room ;undo-stack/pos LDA2 ( c^ addr* pos* ) STH2k ( c addr pos [pos] ) STA2 ( c [pos] ) STH2r INC2 INC2 STH2k ( c pos+2 [pos+2] ) STA ( [pos+2] ) STH2r INC2 ( pos+3 ) ;undo-stack/pos STA2 ( [] ) JMP2r ( path to file being edited ) @filename $80 ( stack of data to undo ) ( ) ( each item in the stack consists of: ) ( - 2 bytes: address to jump to ) ( - 1 byte: character to insert, or \0 to delete ) ( ) ( pos points to the next open stack frame. ) ( when pos points to data the stack is empty. ) ( when pos points to pos the stack is full. ) @undo-stack [ &data $180 ( 128 steps ) &pos :undo-stack/data ] ( actual file data to be edited ) @data $ce80 ( end of femto.tal )