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<pre id='vimCodeElement'>
<span id="L1" class="LineNr">  1 </span><span class="SalientComment">## the basic editor data structure, and how it displays text to the screen</span>
<span id="L2" class="LineNr">  2 </span>
<span id="L3" class="LineNr">  3 </span><span class="Comment"># temporary main for this layer: just render the given text at the given</span>
<span id="L4" class="LineNr">  4 </span><span class="Comment"># screen dimensions, then stop</span>
<span id="L5" class="LineNr">  5 </span><span class="muRecipe">def</span> main text:text [
<span id="L6" class="LineNr">  6 </span>  <span class="Constant">local-scope</span>
<span id="L7" class="LineNr">  7 </span>  <span class="Constant">load-ingredients</span>
<span id="L8" class="LineNr">  8 </span>  open-console
<span id="L9" class="LineNr">  9 </span>  <a href='../081print.mu.html#L623'>hide-screen</a> <span class="Constant">0/screen</span>
<span id="L10" class="LineNr"> 10 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> text, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
<span id="L11" class="LineNr"> 11 </span>  <a href='001-editor.mu.html#L123'>render</a> <span class="Constant">0/screen</span>, e
<span id="L12" class="LineNr"> 12 </span>  <a href='../081print.mu.html#L631'>show-screen</a> <span class="Constant">0/screen</span>
<span id="L13" class="LineNr"> 13 </span>  <a href='../084console.mu.html#L88'>wait-for-event</a> <span class="Constant">0/console</span>
<span id="L14" class="LineNr"> 14 </span>  close-console
<span id="L15" class="LineNr"> 15 </span>]
<span id="L16" class="LineNr"> 16 </span>
<span id="L17" class="LineNr"> 17 </span><span class="muScenario">scenario</span> editor-renders-text-to-screen [
<span id="L18" class="LineNr"> 18 </span>  <span class="Constant">local-scope</span>
<span id="L19" class="LineNr"> 19 </span>  assume-screen <span class="Constant">10/width</span>, <span class="Constant">5/height</span>
<span id="L20" class="LineNr"> 20 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[abc]</span>, <span class="Constant">0/left</span>, <span class="Constant">10/right</span>
<span id="L21" class="LineNr"> 21 </span>  run [
<span id="L22" class="LineNr"> 22 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
<span id="L23" class="LineNr"> 23 </span>  ]
<span id="L24" class="LineNr"> 24 </span>  screen-should-contain [
<span id="L25" class="LineNr"> 25 </span>  <span class="Conceal">¦</span> <span class="Comment"># top line of screen reserved for menu</span>
<span id="L26" class="LineNr"> 26 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
<span id="L27" class="LineNr"> 27 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc       .</span>
<span id="L28" class="LineNr"> 28 </span>  <span class="Conceal">¦</span><span class="Constant"> .          .</span>
<span id="L29" class="LineNr"> 29 </span>  ]
<span id="L30" class="LineNr"> 30 </span>]
<span id="L31" class="LineNr"> 31 </span>
<span id="L32" class="LineNr"> 32 </span><span class="muData">container</span> editor [
<span id="L33" class="LineNr"> 33 </span>  <span class="Comment"># editable text: doubly linked list of characters (head contains a special sentinel)</span>
<span id="L34" class="LineNr"> 34 </span>  data:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char
<span id="L35" class="LineNr"> 35 </span>  top-of-screen:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char
<span id="L36" class="LineNr"> 36 </span>  bottom-of-screen:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char
<span id="L37" class="LineNr"> 37 </span>  <span class="Comment"># location before cursor inside data</span>
<span id="L38" class="LineNr"> 38 </span>  before-cursor:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char
<span id="L39" class="LineNr"> 39 </span>
<span id="L40" class="LineNr"> 40 </span>  <span class="Comment"># raw bounds of display area on screen</span>
<span id="L41" class="LineNr"> 41 </span>  <span class="Comment"># always displays from row 1 (leaving row 0 for a menu) and at most until bottom of screen</span>
<span id="L42" class="LineNr"> 42 </span>  left:num
<span id="L43" class="LineNr"> 43 </span>  right:num
<span id="L44" class="LineNr"> 44 </span>  bottom:num
<span id="L45" class="LineNr"> 45 </span>  <span class="Comment"># raw screen coordinates of cursor</span>
<span id="L46" class="LineNr"> 46 </span>  cursor-row:num
<span id="L47" class="LineNr"> 47 </span>  cursor-column:num
<span id="L48" class="LineNr"> 48 </span>]
<span id="L49" class="LineNr"> 49 </span>
<span id="L50" class="LineNr"> 50 </span><span class="Comment"># creates a new editor widget</span>
<span id="L51" class="LineNr"> 51 </span><span class="Comment">#   right is exclusive</span>
<span id="L52" class="LineNr"> 52 </span><span class="muRecipe">def</span> <a href='001-editor.mu.html#L52'>new-editor</a> s:text, left:num, right:num<span class="muRecipe"> -&gt; </span>result:&amp;:editor [
<span id="L53" class="LineNr"> 53 </span>  <span class="Constant">local-scope</span>
<span id="L54" class="LineNr"> 54 </span>  <span class="Constant">load-ingredients</span>
<span id="L55" class="LineNr"> 55 </span>  <span class="Comment"># no clipping of bounds</span>
<span id="L56" class="LineNr"> 56 </span>  right <span class="Special">&lt;-</span> subtract right,<span class="Constant"> 1</span>
<span id="L57" class="LineNr"> 57 </span>  result <span class="Special">&lt;-</span> new <span class="Constant">editor:type</span>
<span id="L58" class="LineNr"> 58 </span>  <span class="Comment"># initialize screen-related fields</span>
<span id="L59" class="LineNr"> 59 </span>  *result <span class="Special">&lt;-</span> put *result, <span class="Constant">left:offset</span>, left
<span id="L60" class="LineNr"> 60 </span>  *result <span class="Special">&lt;-</span> put *result, <span class="Constant">right:offset</span>, right
<span id="L61" class="LineNr"> 61 </span>  <span class="Comment"># initialize cursor coordinates</span>
<span id="L62" class="LineNr"> 62 </span>  *result <span class="Special">&lt;-</span> put *result, <span class="Constant">cursor-row:offset</span>, <span class="Constant">1/top</span>
<span id="L63" class="LineNr"> 63 </span>  *result <span class="Special">&lt;-</span> put *result, <span class="Constant">cursor-column:offset</span>, left
<span id="L64" class="LineNr"> 64 </span>  <span class="Comment"># initialize empty contents</span>
<span id="L65" class="LineNr"> 65 </span>  init:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> push <span class="Constant">167/§</span>, <span class="Constant">0/tail</span>
<span id="L66" class="LineNr"> 66 </span>  *result <span class="Special">&lt;-</span> put *result, <span class="Constant">data:offset</span>, init
<span id="L67" class="LineNr"> 67 </span>  *result <span class="Special">&lt;-</span> put *result, <span class="Constant">top-of-screen:offset</span>, init
<span id="L68" class="LineNr"> 68 </span>  *result <span class="Special">&lt;-</span> put *result, <span class="Constant">before-cursor:offset</span>, init
<span id="L69" class="LineNr"> 69 </span>  result <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L73'>insert-text</a> result, s
<span id="L70" class="LineNr"> 70 </span><span class="Constant">  <a href='001-editor.mu.html#L70'>&lt;editor-initialization&gt;</a></span>
<span id="L71" class="LineNr"> 71 </span>]
<span id="L72" class="LineNr"> 72 </span>
<span id="L73" class="LineNr"> 73 </span><span class="muRecipe">def</span> <a href='001-editor.mu.html#L73'>insert-text</a> editor:&amp;:editor, text:text<span class="muRecipe"> -&gt; </span>editor:&amp;:editor [
<span id="L74" class="LineNr"> 74 </span>  <span class="Constant">local-scope</span>
<span id="L75" class="LineNr"> 75 </span>  <span class="Constant">load-ingredients</span>
<span id="L76" class="LineNr"> 76 </span>  <span class="Comment"># early exit if text is empty</span>
<span id="L77" class="LineNr"> 77 </span>  <span class="muControl">return-unless</span> text
<span id="L78" class="LineNr"> 78 </span>  len:num <span class="Special">&lt;-</span> length *text
<span id="L79" class="LineNr"> 79 </span>  <span class="muControl">return-unless</span> len
<span id="L80" class="LineNr"> 80 </span>  idx:num <span class="Special">&lt;-</span> copy<span class="Constant"> 0</span>
<span id="L81" class="LineNr"> 81 </span>  <span class="Comment"># now we can start appending the rest, character by character</span>
<span id="L82" class="LineNr"> 82 </span>  curr:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">data:offset</span>
<span id="L83" class="LineNr"> 83 </span>  <span class="Delimiter">{</span>
<span id="L84" class="LineNr"> 84 </span>  <span class="Conceal">¦</span> done?:bool <span class="Special">&lt;-</span> greater-or-equal idx, len
<span id="L85" class="LineNr"> 85 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> done?
<span id="L86" class="LineNr"> 86 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> index *text, idx
<span id="L87" class="LineNr"> 87 </span>  <span class="Conceal">¦</span> insert c, curr
<span id="L88" class="LineNr"> 88 </span>  <span class="Conceal">¦</span> <span class="Comment"># next iter</span>
<span id="L89" class="LineNr"> 89 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
<span id="L90" class="LineNr"> 90 </span>  <span class="Conceal">¦</span> idx <span class="Special">&lt;-</span> add idx,<span class="Constant"> 1</span>
<span id="L91" class="LineNr"> 91 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
<span id="L92" class="LineNr"> 92 </span>  <span class="Delimiter">}</span>
<span id="L93" class="LineNr"> 93 </span>]
<span id="L94" class="LineNr"> 94 </span>
<span id="L95" class="LineNr"> 95 </span><span class="muScenario">scenario</span> editor-initializes-without-data [
<span id="L96" class="LineNr"> 96 </span>  <span class="Constant">local-scope</span>
<span id="L97" class="LineNr"> 97 </span>  assume-screen <span class="Constant">5/width</span>, <span class="Constant">3/height</span>
<span id="L98" class="LineNr"> 98 </span>  run [
<span id="L99" class="LineNr"> 99 </span>  <span class="Conceal">¦</span> e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">0/data</span>, <span class="Constant">2/left</span>, <span class="Constant">5/right</span>
<span id="L100" class="LineNr">100 </span>  <span class="Conceal">¦</span> 2:editor/<span class="Special">raw</span> <span class="Special">&lt;-</span> copy *e
<span id="L101" class="LineNr">101 </span>  ]
<span id="L102" class="LineNr">102 </span>  memory-should-contain [
<span id="L103" class="LineNr">103 </span>  <span class="Conceal">¦</span> <span class="Comment"># 2 (data) &lt;- just the § sentinel</span>
<span id="L104" class="LineNr">104 </span>  <span class="Conceal">¦</span> <span class="Comment"># 3 (top of screen) &lt;- the § sentinel</span>
<span id="L105" class="LineNr">105 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># bottom-of-screen; null since text fits on screen</span>
<span id="L106" class="LineNr">106 </span>  <span class="Conceal">¦</span> <span class="Comment"># 5 (before cursor) &lt;- the § sentinel</span>
<span id="L107" class="LineNr">107 </span>  <span class="Conceal">¦</span><span class="Constant"> 6</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># left</span>
<span id="L108" class="LineNr">108 </span>  <span class="Conceal">¦</span><span class="Constant"> 7</span> <span class="Special">&lt;-</span><span class="Constant"> 4</span>  <span class="Comment"># right  (inclusive)</span>
<span id="L109" class="LineNr">109 </span>  <span class="Conceal">¦</span><span class="Constant"> 8</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># bottom (not set until render)</span>
<span id="L110" class="LineNr">110 </span>  <span class="Conceal">¦</span><span class="Constant"> 9</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor row</span>
<span id="L111" class="LineNr">111 </span>  <span class="Conceal">¦</span><span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 2</span>  <span class="Comment"># cursor column</span>
<span id="L112" class="LineNr">112 </span>  ]
<span id="L113" class="LineNr">113 </span>  screen-should-contain [
<span id="L114" class="LineNr">114 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L115" class="LineNr">115 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L116" class="LineNr">116 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L117" class="LineNr">117 </span>  ]
<span id="L118" class="LineNr">118 </span>]
<span id="L119" class="LineNr">119 </span>
<span id="L120" class="LineNr">120 </span><span class="Comment"># Assumes cursor should be at coordinates (cursor-row, cursor-column) and</span>
<span id="L121" class="LineNr">121 </span><span class="Comment"># updates before-cursor to match. Might also move coordinates if they're</span>
<span id="L122" class="LineNr">122 </span><span class="Comment"># outside text.</span>
<span id="L123" class="LineNr">123 </span><span class="muRecipe">def</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, editor:&amp;:editor<span class="muRecipe"> -&gt; </span>last-row:num, last-column:num, <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, editor:&amp;:editor [
<span id="L124" class="LineNr">124 </span>  <span class="Constant">local-scope</span>
<span id="L125" class="LineNr">125 </span>  <span class="Constant">load-ingredients</span>
<span id="L126" class="LineNr">126 </span>  <span class="muControl">return-unless</span> editor, <span class="Constant">1/top</span>, <span class="Constant">0/left</span>
<span id="L127" class="LineNr">127 </span>  left:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">left:offset</span>
<span id="L128" class="LineNr">128 </span>  <a href='../081print.mu.html#L594'>screen-height</a>:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L594'>screen-height</a> <a href='../081print.mu.html#L4'>screen</a>
<span id="L129" class="LineNr">129 </span>  right:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">right:offset</span>
<span id="L130" class="LineNr">130 </span>  <span class="Comment"># traversing editor</span>
<span id="L131" class="LineNr">131 </span>  curr:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
<span id="L132" class="LineNr">132 </span>  <a href='../065duplex_list.mu.html#L36'>prev</a>:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> copy curr  <span class="Comment"># just in case curr becomes null and we can't compute prev</span>
<span id="L133" class="LineNr">133 </span>  curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
<span id="L134" class="LineNr">134 </span>  <span class="Comment"># traversing screen</span>
<span id="L135" class="LineNr">135 </span>  color:num <span class="Special">&lt;-</span> copy <span class="Constant">7/white</span>
<span id="L136" class="LineNr">136 </span>  row:num <span class="Special">&lt;-</span> copy <span class="Constant">1/top</span>
<span id="L137" class="LineNr">137 </span>  column:num <span class="Special">&lt;-</span> copy left
<span id="L138" class="LineNr">138 </span>  cursor-row:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-row:offset</span>
<span id="L139" class="LineNr">139 </span>  cursor-column:num <span class="Special">&lt;-</span> get *editor, <span class="Constant">cursor-column:offset</span>
<span id="L140" class="LineNr">140 </span>  before-cursor:&amp;:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special">&lt;-</span> get *editor, <span class="Constant">before-cursor:offset</span>
<span id="L141" class="LineNr">141 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
<span id="L142" class="LineNr">142 </span>  <span class="Delimiter">{</span>
<span id="L143" class="LineNr">143 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> +next-character</span>
<span id="L144" class="LineNr">144 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> curr
<span id="L145" class="LineNr">145 </span>  <span class="Conceal">¦</span> off-screen?:bool <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L594'>screen-height</a>
<span id="L146" class="LineNr">146 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> off-screen?
<span id="L147" class="LineNr">147 </span>  <span class="Conceal">¦</span> <span class="Comment"># update editor.before-cursor</span>
<span id="L148" class="LineNr">148 </span>  <span class="Conceal">¦</span> <span class="Comment"># Doing so at the start of each iteration ensures it stays one step behind</span>
<span id="L149" class="LineNr">149 </span>  <span class="Conceal">¦</span> <span class="Comment"># the current character.</span>
<span id="L150" class="LineNr">150 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
<span id="L151" class="LineNr">151 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-cursor-row?:bool <span class="Special">&lt;-</span> equal row, cursor-row
<span id="L152" class="LineNr">152 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-cursor-row?
<span id="L153" class="LineNr">153 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-cursor?:bool <span class="Special">&lt;-</span> equal column, cursor-column
<span id="L154" class="LineNr">154 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-cursor?
<span id="L155" class="LineNr">155 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L36'>prev</a>
<span id="L156" class="LineNr">156 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L157" class="LineNr">157 </span>  <span class="Conceal">¦</span> c:char <span class="Special">&lt;-</span> get *curr, <span class="Constant">value:offset</span>
<span id="L158" class="LineNr">158 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> &lt;character-c-received&gt;</span>
<span id="L159" class="LineNr">159 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
<span id="L160" class="LineNr">160 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># newline? move to left rather than 0</span>
<span id="L161" class="LineNr">161 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> newline?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
<span id="L162" class="LineNr">162 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> newline?
<span id="L163" class="LineNr">163 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># adjust cursor if necessary</span>
<span id="L164" class="LineNr">164 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">{</span>
<span id="L165" class="LineNr">165 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-cursor-row?:bool <span class="Special">&lt;-</span> equal row, cursor-row
<span id="L166" class="LineNr">166 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-cursor-row?
<span id="L167" class="LineNr">167 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> left-of-cursor?:bool <span class="Special">&lt;-</span> lesser-than column, cursor-column
<span id="L168" class="LineNr">168 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> left-of-cursor?
<span id="L169" class="LineNr">169 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> copy column
<span id="L170" class="LineNr">170 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L36'>prev</a> curr
<span id="L171" class="LineNr">171 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L172" class="LineNr">172 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># clear rest of line in this window</span>
<span id="L173" class="LineNr">173 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L408'>clear-line-until</a> <a href='../081print.mu.html#L4'>screen</a>, right
<span id="L174" class="LineNr">174 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># skip to next line</span>
<span id="L175" class="LineNr">175 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
<span id="L176" class="LineNr">176 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> copy left
<span id="L177" class="LineNr">177 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
<span id="L178" class="LineNr">178 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
<span id="L179" class="LineNr">179 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L36'>prev</a> <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> <a href='../065duplex_list.mu.html#L36'>prev</a>
<span id="L180" class="LineNr">180 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-character</span>
<span id="L181" class="LineNr">181 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L182" class="LineNr">182 </span>  <span class="Conceal">¦</span> <span class="Delimiter">{</span>
<span id="L183" class="LineNr">183 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># at right? wrap. even if there's only one more letter left; we need</span>
<span id="L184" class="LineNr">184 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># room for clicking on the cursor after it.</span>
<span id="L185" class="LineNr">185 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> at-right?:bool <span class="Special">&lt;-</span> equal column, right
<span id="L186" class="LineNr">186 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">break-unless</span> at-right?
<span id="L187" class="LineNr">187 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># print wrap icon</span>
<span id="L188" class="LineNr">188 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> wrap-icon:char <span class="Special">&lt;-</span> copy <span class="Constant">8617/loop-back-to-left</span>
<span id="L189" class="LineNr">189 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, wrap-icon, <span class="Constant">245/grey</span>
<span id="L190" class="LineNr">190 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> copy left
<span id="L191" class="LineNr">191 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
<span id="L192" class="LineNr">192 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
<span id="L193" class="LineNr">193 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="Comment"># don't increment curr</span>
<span id="L194" class="LineNr">194 </span>  <span class="Conceal">¦</span> <span class="Conceal">¦</span> <span class="muControl">loop</span> <span class="Constant">+next-character</span>
<span id="L195" class="LineNr">195 </span>  <span class="Conceal">¦</span> <span class="Delimiter">}</span>
<span id="L196" class="LineNr">196 </span>  <span class="Conceal">¦</span> print <a href='../081print.mu.html#L4'>screen</a>, c, color
<span id="L197" class="LineNr">197 </span>  <span class="Conceal">¦</span> curr <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> curr
<span id="L198" class="LineNr">198 </span>  <span class="Conceal">¦</span> <a href='../065duplex_list.mu.html#L36'>prev</a> <span class="Special">&lt;-</span> <a href='../065duplex_list.mu.html#L29'>next</a> <a href='../065duplex_list.mu.html#L36'>prev</a>
<span id="L199" class="LineNr">199 </span>  <span class="Conceal">¦</span> column <span class="Special">&lt;-</span> add column,<span class="Constant"> 1</span>
<span id="L200" class="LineNr">200 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
<span id="L201" class="LineNr">201 </span>  <span class="Delimiter">}</span>
<span id="L202" class="LineNr">202 </span>  <span class="Comment"># save first character off-screen</span>
<span id="L203" class="LineNr">203 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">bottom-of-screen:offset</span>, curr
<span id="L204" class="LineNr">204 </span>  <span class="Comment"># is cursor to the right of the last line? move to end</span>
<span id="L205" class="LineNr">205 </span>  <span class="Delimiter">{</span>
<span id="L206" class="LineNr">206 </span>  <span class="Conceal">¦</span> at-cursor-row?:bool <span class="Special">&lt;-</span> equal row, cursor-row
<span id="L207" class="LineNr">207 </span>  <span class="Conceal">¦</span> cursor-outside-line?:bool <span class="Special">&lt;-</span> lesser-or-equal column, cursor-column
<span id="L208" class="LineNr">208 </span>  <span class="Conceal">¦</span> before-cursor-on-same-line?:bool <span class="Special">&lt;-</span> and at-cursor-row?, cursor-outside-line?
<span id="L209" class="LineNr">209 </span>  <span class="Conceal">¦</span> above-cursor-row?:bool <span class="Special">&lt;-</span> lesser-than row, cursor-row
<span id="L210" class="LineNr">210 </span>  <span class="Conceal">¦</span> before-cursor?:bool <span class="Special">&lt;-</span> or before-cursor-on-same-line?, above-cursor-row?
<span id="L211" class="LineNr">211 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> before-cursor?
<span id="L212" class="LineNr">212 </span>  <span class="Conceal">¦</span> cursor-row <span class="Special">&lt;-</span> copy row
<span id="L213" class="LineNr">213 </span>  <span class="Conceal">¦</span> cursor-column <span class="Special">&lt;-</span> copy column
<span id="L214" class="LineNr">214 </span>  <span class="Conceal">¦</span> before-cursor <span class="Special">&lt;-</span> copy <a href='../065duplex_list.mu.html#L36'>prev</a>
<span id="L215" class="LineNr">215 </span>  <span class="Delimiter">}</span>
<span id="L216" class="LineNr">216 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">bottom:offset</span>, row
<span id="L217" class="LineNr">217 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-row:offset</span>, cursor-row
<span id="L218" class="LineNr">218 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">cursor-column:offset</span>, cursor-column
<span id="L219" class="LineNr">219 </span>  *editor <span class="Special">&lt;-</span> put *editor, <span class="Constant">before-cursor:offset</span>, before-cursor
<span id="L220" class="LineNr">220 </span>  <span class="muControl">return</span> row, column
<span id="L221" class="LineNr">221 </span>]
<span id="L222" class="LineNr">222 </span>
<span id="L223" class="LineNr">223 </span><span class="muRecipe">def</span> <a href='001-editor.mu.html#L223'>clear-screen-from</a> <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, row:num, column:num, left:num, right:num<span class="muRecipe"> -&gt; </span><a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a> [
<span id="L224" class="LineNr">224 </span>  <span class="Constant">local-scope</span>
<span id="L225" class="LineNr">225 </span>  <span class="Constant">load-ingredients</span>
<span id="L226" class="LineNr">226 </span>  <span class="Comment"># if it's the real screen, use the optimized primitive</span>
<span id="L227" class="LineNr">227 </span>  <span class="Delimiter">{</span>
<span id="L228" class="LineNr">228 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> <a href='../081print.mu.html#L4'>screen</a>
<span id="L229" class="LineNr">229 </span>  <span class="Conceal">¦</span> clear-display-from row, column, left, right
<span id="L230" class="LineNr">230 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
<span id="L231" class="LineNr">231 </span>  <span class="Delimiter">}</span>
<span id="L232" class="LineNr">232 </span>  <span class="Comment"># if not, go the slower route</span>
<span id="L233" class="LineNr">233 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, column
<span id="L234" class="LineNr">234 </span>  <a href='../081print.mu.html#L408'>clear-line-until</a> <a href='../081print.mu.html#L4'>screen</a>, right
<span id="L235" class="LineNr">235 </span>  <a href='001-editor.mu.html#L238'>clear-rest-of-screen</a> <a href='../081print.mu.html#L4'>screen</a>, row, left, right
<span id="L236" class="LineNr">236 </span>]
<span id="L237" class="LineNr">237 </span>
<span id="L238" class="LineNr">238 </span><span class="muRecipe">def</span> <a href='001-editor.mu.html#L238'>clear-rest-of-screen</a> <a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a>, row:num, left:num, right:num<span class="muRecipe"> -&gt; </span><a href='../081print.mu.html#L4'>screen</a>:&amp;:<a href='../081print.mu.html#L4'>screen</a> [
<span id="L239" class="LineNr">239 </span>  <span class="Constant">local-scope</span>
<span id="L240" class="LineNr">240 </span>  <span class="Constant">load-ingredients</span>
<span id="L241" class="LineNr">241 </span>  row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
<span id="L242" class="LineNr">242 </span>  <span class="Comment"># if it's the real screen, use the optimized primitive</span>
<span id="L243" class="LineNr">243 </span>  <span class="Delimiter">{</span>
<span id="L244" class="LineNr">244 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> <a href='../081print.mu.html#L4'>screen</a>
<span id="L245" class="LineNr">245 </span>  <span class="Conceal">¦</span> clear-display-from row, left, left, right
<span id="L246" class="LineNr">246 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span>
<span id="L247" class="LineNr">247 </span>  <span class="Delimiter">}</span>
<span id="L248" class="LineNr">248 </span>  <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, left
<span id="L249" class="LineNr">249 </span>  <a href='../081print.mu.html#L594'>screen-height</a>:num <span class="Special">&lt;-</span> <a href='../081print.mu.html#L594'>screen-height</a> <a href='../081print.mu.html#L4'>screen</a>
<span id="L250" class="LineNr">250 </span>  <span class="Delimiter">{</span>
<span id="L251" class="LineNr">251 </span>  <span class="Conceal">¦</span> at-bottom-of-screen?:bool <span class="Special">&lt;-</span> greater-or-equal row, <a href='../081print.mu.html#L594'>screen-height</a>
<span id="L252" class="LineNr">252 </span>  <span class="Conceal">¦</span> <span class="muControl">break-if</span> at-bottom-of-screen?
<span id="L253" class="LineNr">253 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L4'>screen</a> <span class="Special">&lt;-</span> <a href='../081print.mu.html#L442'>move-cursor</a> <a href='../081print.mu.html#L4'>screen</a>, row, left
<span id="L254" class="LineNr">254 </span>  <span class="Conceal">¦</span> <a href='../081print.mu.html#L408'>clear-line-until</a> <a href='../081print.mu.html#L4'>screen</a>, right
<span id="L255" class="LineNr">255 </span>  <span class="Conceal">¦</span> row <span class="Special">&lt;-</span> add row,<span class="Constant"> 1</span>
<span id="L256" class="LineNr">256 </span>  <span class="Conceal">¦</span> <span class="muControl">loop</span>
<span id="L257" class="LineNr">257 </span>  <span class="Delimiter">}</span>
<span id="L258" class="LineNr">258 </span>]
<span id="L259" class="LineNr">259 </span>
<span id="L260" class="LineNr">260 </span><span class="muScenario">scenario</span> editor-prints-multiple-lines [
<span id="L261" class="LineNr">261 </span>  <span class="Constant">local-scope</span>
<span id="L262" class="LineNr">262 </span>  assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
<span id="L263" class="LineNr">263 </span>  s:text <span class="Special">&lt;-</span> new <span class="Constant">[abc</span>
<span id="L264" class="LineNr">264 </span><span class="Constant">def]</span>
<span id="L265" class="LineNr">265 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
<span id="L266" class="LineNr">266 </span>  run [
<span id="L267" class="LineNr">267 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
<span id="L268" class="LineNr">268 </span>  ]
<span id="L269" class="LineNr">269 </span>  screen-should-contain [
<span id="L270" class="LineNr">270 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L271" class="LineNr">271 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc  .</span>
<span id="L272" class="LineNr">272 </span>  <span class="Conceal">¦</span><span class="Constant"> .def  .</span>
<span id="L273" class="LineNr">273 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L274" class="LineNr">274 </span>  ]
<span id="L275" class="LineNr">275 </span>]
<span id="L276" class="LineNr">276 </span>
<span id="L277" class="LineNr">277 </span><span class="muScenario">scenario</span> editor-handles-offsets [
<span id="L278" class="LineNr">278 </span>  <span class="Constant">local-scope</span>
<span id="L279" class="LineNr">279 </span>  assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
<span id="L280" class="LineNr">280 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[abc]</span>, <span class="Constant">1/left</span>, <span class="Constant">5/right</span>
<span id="L281" class="LineNr">281 </span>  run [
<span id="L282" class="LineNr">282 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
<span id="L283" class="LineNr">283 </span>  ]
<span id="L284" class="LineNr">284 </span>  screen-should-contain [
<span id="L285" class="LineNr">285 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L286" class="LineNr">286 </span>  <span class="Conceal">¦</span><span class="Constant"> . abc .</span>
<span id="L287" class="LineNr">287 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L288" class="LineNr">288 </span>  ]
<span id="L289" class="LineNr">289 </span>]
<span id="L290" class="LineNr">290 </span>
<span id="L291" class="LineNr">291 </span><span class="muScenario">scenario</span> editor-prints-multiple-lines-at-offset [
<span id="L292" class="LineNr">292 </span>  <span class="Constant">local-scope</span>
<span id="L293" class="LineNr">293 </span>  assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
<span id="L294" class="LineNr">294 </span>  s:text <span class="Special">&lt;-</span> new <span class="Constant">[abc</span>
<span id="L295" class="LineNr">295 </span><span class="Constant">def]</span>
<span id="L296" class="LineNr">296 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">1/left</span>, <span class="Constant">5/right</span>
<span id="L297" class="LineNr">297 </span>  run [
<span id="L298" class="LineNr">298 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
<span id="L299" class="LineNr">299 </span>  ]
<span id="L300" class="LineNr">300 </span>  screen-should-contain [
<span id="L301" class="LineNr">301 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L302" class="LineNr">302 </span>  <span class="Conceal">¦</span><span class="Constant"> . abc .</span>
<span id="L303" class="LineNr">303 </span>  <span class="Conceal">¦</span><span class="Constant"> . def .</span>
<span id="L304" class="LineNr">304 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L305" class="LineNr">305 </span>  ]
<span id="L306" class="LineNr">306 </span>]
<span id="L307" class="LineNr">307 </span>
<span id="L308" class="LineNr">308 </span><span class="muScenario">scenario</span> editor-wraps-long-lines [
<span id="L309" class="LineNr">309 </span>  <span class="Constant">local-scope</span>
<span id="L310" class="LineNr">310 </span>  assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
<span id="L311" class="LineNr">311 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[abc def]</span>, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
<span id="L312" class="LineNr">312 </span>  run [
<span id="L313" class="LineNr">313 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
<span id="L314" class="LineNr">314 </span>  ]
<span id="L315" class="LineNr">315 </span>  screen-should-contain [
<span id="L316" class="LineNr">316 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L317" class="LineNr">317 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc ↩.</span>
<span id="L318" class="LineNr">318 </span>  <span class="Conceal">¦</span><span class="Constant"> .def  .</span>
<span id="L319" class="LineNr">319 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L320" class="LineNr">320 </span>  ]
<span id="L321" class="LineNr">321 </span>  screen-should-contain-in-color <span class="Constant">245/grey</span> [
<span id="L322" class="LineNr">322 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L323" class="LineNr">323 </span>  <span class="Conceal">¦</span><span class="Constant"> .    ↩.</span>
<span id="L324" class="LineNr">324 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L325" class="LineNr">325 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L326" class="LineNr">326 </span>  ]
<span id="L327" class="LineNr">327 </span>]
<span id="L328" class="LineNr">328 </span>
<span id="L329" class="LineNr">329 </span><span class="muScenario">scenario</span> editor-wraps-barely-long-lines [
<span id="L330" class="LineNr">330 </span>  <span class="Constant">local-scope</span>
<span id="L331" class="LineNr">331 </span>  assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
<span id="L332" class="LineNr">332 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[abcde]</span>, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
<span id="L333" class="LineNr">333 </span>  run [
<span id="L334" class="LineNr">334 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
<span id="L335" class="LineNr">335 </span>  ]
<span id="L336" class="LineNr">336 </span>  <span class="Comment"># still wrap, even though the line would fit. We need room to click on the</span>
<span id="L337" class="LineNr">337 </span>  <span class="Comment"># end of the line</span>
<span id="L338" class="LineNr">338 </span>  screen-should-contain [
<span id="L339" class="LineNr">339 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L340" class="LineNr">340 </span><span class="Constant">  </span><span class="Conceal">¦</span><span class="Constant"> .abcd↩.</span>
<span id="L341" class="LineNr">341 </span>  <span class="Conceal">¦</span><span class="Constant"> .e    .</span>
<span id="L342" class="LineNr">342 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L343" class="LineNr">343 </span>  ]
<span id="L344" class="LineNr">344 </span>  screen-should-contain-in-color <span class="Constant">245/grey</span> [
<span id="L345" class="LineNr">345 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L346" class="LineNr">346 </span>  <span class="Conceal">¦</span><span class="Constant"> .    ↩.</span>
<span id="L347" class="LineNr">347 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L348" class="LineNr">348 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L349" class="LineNr">349 </span>  ]
<span id="L350" class="LineNr">350 </span>]
<span id="L351" class="LineNr">351 </span>
<span id="L352" class="LineNr">352 </span><span class="muScenario">scenario</span> editor-with-empty-text [
<span id="L353" class="LineNr">353 </span>  <span class="Constant">local-scope</span>
<span id="L354" class="LineNr">354 </span>  assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
<span id="L355" class="LineNr">355 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> <span class="Constant">[]</span>, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
<span id="L356" class="LineNr">356 </span>  run [
<span id="L357" class="LineNr">357 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
<span id="L358" class="LineNr">358 </span>  <span class="Conceal">¦</span> 3:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-row:offset</span>
<span id="L359" class="LineNr">359 </span>  <span class="Conceal">¦</span> 4:num/<span class="Special">raw</span> <span class="Special">&lt;-</span> get *e, <span class="Constant">cursor-column:offset</span>
<span id="L360" class="LineNr">360 </span>  ]
<span id="L361" class="LineNr">361 </span>  screen-should-contain [
<span id="L362" class="LineNr">362 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L363" class="LineNr">363 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L364" class="LineNr">364 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L365" class="LineNr">365 </span>  ]
<span id="L366" class="LineNr">366 </span>  memory-should-contain [
<span id="L367" class="LineNr">367 </span>  <span class="Conceal">¦</span><span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># cursor row</span>
<span id="L368" class="LineNr">368 </span>  <span class="Conceal">¦</span><span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 0</span>  <span class="Comment"># cursor column</span>
<span id="L369" class="LineNr">369 </span>  ]
<span id="L370" class="LineNr">370 </span>]
<span id="L371" class="LineNr">371 </span>
<span id="L372" class="LineNr">372 </span><span class="Comment"># just a little color for Mu code</span>
<span id="L373" class="LineNr">373 </span>
<span id="L374" class="LineNr">374 </span><span class="muScenario">scenario</span> render-colors-comments [
<span id="L375" class="LineNr">375 </span>  <span class="Constant">local-scope</span>
<span id="L376" class="LineNr">376 </span>  assume-screen <span class="Constant">5/width</span>, <span class="Constant">5/height</span>
<span id="L377" class="LineNr">377 </span>  s:text <span class="Special">&lt;-</span> new <span class="Constant">[abc</span>
<span id="L378" class="LineNr">378 </span><span class="Constant"># de</span>
<span id="L379" class="LineNr">379 </span><span class="Constant">f]</span>
<span id="L380" class="LineNr">380 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">5/right</span>
<span id="L381" class="LineNr">381 </span>  run [
<span id="L382" class="LineNr">382 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
<span id="L383" class="LineNr">383 </span>  ]
<span id="L384" class="LineNr">384 </span>  screen-should-contain [
<span id="L385" class="LineNr">385 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L386" class="LineNr">386 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc  .</span>
<span id="L387" class="LineNr">387 </span>  <span class="Conceal">¦</span><span class="Constant"> .# de .</span>
<span id="L388" class="LineNr">388 </span>  <span class="Conceal">¦</span><span class="Constant"> .f    .</span>
<span id="L389" class="LineNr">389 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L390" class="LineNr">390 </span>  ]
<span id="L391" class="LineNr">391 </span>  screen-should-contain-in-color <span class="Constant">12/lightblue</span>, [
<span id="L392" class="LineNr">392 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L393" class="LineNr">393 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L394" class="LineNr">394 </span>  <span class="Conceal">¦</span><span class="Constant"> .# de .</span>
<span id="L395" class="LineNr">395 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L396" class="LineNr">396 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L397" class="LineNr">397 </span>  ]
<span id="L398" class="LineNr">398 </span>  screen-should-contain-in-color <span class="Constant">7/white</span>, [
<span id="L399" class="LineNr">399 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L400" class="LineNr">400 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc  .</span>
<span id="L401" class="LineNr">401 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L402" class="LineNr">402 </span>  <span class="Conceal">¦</span><span class="Constant"> .f    .</span>
<span id="L403" class="LineNr">403 </span>  <span class="Conceal">¦</span><span class="Constant"> .     .</span>
<span id="L404" class="LineNr">404 </span>  ]
<span id="L405" class="LineNr">405 </span>]
<span id="L406" class="LineNr">406 </span>
<span id="L407" class="LineNr">407 </span><span class="muRecipe">after</span> <span class="Constant">&lt;character-c-received&gt;</span> [
<span id="L408" class="LineNr">408 </span>  color <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L412'>get-color</a> color, c
<span id="L409" class="LineNr">409 </span>]
<span id="L410" class="LineNr">410 </span>
<span id="L411" class="LineNr">411 </span><span class="Comment"># so far the previous color is all the information we need; that may change</span>
<span id="L412" class="LineNr">412 </span><span class="muRecipe">def</span> <a href='001-editor.mu.html#L412'>get-color</a> color:num, c:char<span class="muRecipe"> -&gt; </span>color:num [
<span id="L413" class="LineNr">413 </span>  <span class="Constant">local-scope</span>
<span id="L414" class="LineNr">414 </span>  <span class="Constant">load-ingredients</span>
<span id="L415" class="LineNr">415 </span>  color-is-white?:bool <span class="Special">&lt;-</span> equal color, <span class="Constant">7/white</span>
<span id="L416" class="LineNr">416 </span>  <span class="Comment"># if color is white and next character is '#', switch color to blue</span>
<span id="L417" class="LineNr">417 </span>  <span class="Delimiter">{</span>
<span id="L418" class="LineNr">418 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> color-is-white?
<span id="L419" class="LineNr">419 </span>  <span class="Conceal">¦</span> starting-comment?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">35/#</span>
<span id="L420" class="LineNr">420 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> starting-comment?
<span id="L421" class="LineNr">421 </span>  <span class="Conceal">¦</span> trace<span class="Constant"> 90</span>, <span class="Constant">[app]</span>, <span class="Constant">[switch color back to blue]</span>
<span id="L422" class="LineNr">422 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">12/lightblue</span>
<span id="L423" class="LineNr">423 </span>  <span class="Delimiter">}</span>
<span id="L424" class="LineNr">424 </span>  <span class="Comment"># if color is blue and next character is newline, switch color to white</span>
<span id="L425" class="LineNr">425 </span>  <span class="Delimiter">{</span>
<span id="L426" class="LineNr">426 </span>  <span class="Conceal">¦</span> color-is-blue?:bool <span class="Special">&lt;-</span> equal color, <span class="Constant">12/lightblue</span>
<span id="L427" class="LineNr">427 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> color-is-blue?
<span id="L428" class="LineNr">428 </span>  <span class="Conceal">¦</span> ending-comment?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">10/newline</span>
<span id="L429" class="LineNr">429 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> ending-comment?
<span id="L430" class="LineNr">430 </span>  <span class="Conceal">¦</span> trace<span class="Constant"> 90</span>, <span class="Constant">[app]</span>, <span class="Constant">[switch color back to white]</span>
<span id="L431" class="LineNr">431 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">7/white</span>
<span id="L432" class="LineNr">432 </span>  <span class="Delimiter">}</span>
<span id="L433" class="LineNr">433 </span>  <span class="Comment"># if color is white (no comments) and next character is '&lt;', switch color to red</span>
<span id="L434" class="LineNr">434 </span>  <span class="Delimiter">{</span>
<span id="L435" class="LineNr">435 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> color-is-white?
<span id="L436" class="LineNr">436 </span>  <span class="Conceal">¦</span> starting-assignment?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">60/&lt;</span>
<span id="L437" class="LineNr">437 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> starting-assignment?
<span id="L438" class="LineNr">438 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">1/red</span>
<span id="L439" class="LineNr">439 </span>  <span class="Delimiter">}</span>
<span id="L440" class="LineNr">440 </span>  <span class="Comment"># if color is red and next character is space, switch color to white</span>
<span id="L441" class="LineNr">441 </span>  <span class="Delimiter">{</span>
<span id="L442" class="LineNr">442 </span>  <span class="Conceal">¦</span> color-is-red?:bool <span class="Special">&lt;-</span> equal color, <span class="Constant">1/red</span>
<span id="L443" class="LineNr">443 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> color-is-red?
<span id="L444" class="LineNr">444 </span>  <span class="Conceal">¦</span> ending-assignment?:bool <span class="Special">&lt;-</span> equal c, <span class="Constant">32/space</span>
<span id="L445" class="LineNr">445 </span>  <span class="Conceal">¦</span> <span class="muControl">break-unless</span> ending-assignment?
<span id="L446" class="LineNr">446 </span>  <span class="Conceal">¦</span> <span class="muControl">return</span> <span class="Constant">7/white</span>
<span id="L447" class="LineNr">447 </span>  <span class="Delimiter">}</span>
<span id="L448" class="LineNr">448 </span>  <span class="Comment"># otherwise no change</span>
<span id="L449" class="LineNr">449 </span>  <span class="muControl">return</span> color
<span id="L450" class="LineNr">450 </span>]
<span id="L451" class="LineNr">451 </span>
<span id="L452" class="LineNr">452 </span><span class="muScenario">scenario</span> render-colors-assignment [
<span id="L453" class="LineNr">453 </span>  <span class="Constant">local-scope</span>
<span id="L454" class="LineNr">454 </span>  assume-screen <span class="Constant">8/width</span>, <span class="Constant">5/height</span>
<span id="L455" class="LineNr">455 </span>  s:text <span class="Special">&lt;-</span> new <span class="Constant">[abc</span>
<span id="L456" class="LineNr">456 </span><span class="Constant">d &lt;- e</span>
<span id="L457" class="LineNr">457 </span><span class="Constant">f]</span>
<span id="L458" class="LineNr">458 </span>  e:&amp;:editor <span class="Special">&lt;-</span> <a href='001-editor.mu.html#L52'>new-editor</a> s, <span class="Constant">0/left</span>, <span class="Constant">8/right</span>
<span id="L459" class="LineNr">459 </span>  run [
<span id="L460" class="LineNr">460 </span>  <span class="Conceal">¦</span> <a href='001-editor.mu.html#L123'>render</a> <a href='../081print.mu.html#L4'>screen</a>, e
<span id="L461" class="LineNr">461 </span>  ]
<span id="L462" class="LineNr">462 </span>  screen-should-contain [
<span id="L463" class="LineNr">463 </span>  <span class="Conceal">¦</span><span class="Constant"> .        .</span>
<span id="L464" class="LineNr">464 </span>  <span class="Conceal">¦</span><span class="Constant"> .abc     .</span>
<span id="L465" class="LineNr">465 </span>  <span class="Conceal">¦</span><span class="Constant"> .d &lt;- e  .</span>
<span id="L466" class="LineNr">466 </span>  <span class="Conceal">¦</span><span class="Constant"> .f       .</span>
<span id="L467" class="LineNr">467 </span>  <span class="Conceal">¦</span><span class="Constant"> .        .</span>
<span id="L468" class="LineNr">468 </span>  ]
<span id="L469" class="LineNr">469 </span>  screen-should-contain-in-color <span class="Constant">1/red</span>, [
<span id="L470" class="LineNr">470 </span>  <span class="Conceal">¦</span><span class="Constant"> .        .</span>
<span id="L471" class="LineNr">471 </span>  <span class="Conceal">¦</span><span class="Constant"> .        .</span>
<span id="L472" class="LineNr">472 </span>  <span class="Conceal">¦</span><span class="Constant"> .  &lt;-    .</span>
<span id="L473" class="LineNr">473 </span>  <span class="Conceal">¦</span><span class="Constant"> .        .</span>
<span id="L474" class="LineNr">474 </span>  <span class="Conceal">¦</span><span class="Constant"> .        .</span>
<span id="L475" class="LineNr">475 </span>  ]
<span id="L476" class="LineNr">476 </span>]
</pre>
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