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<a href='https://github.com/akkartik/mu/blob/master/edit/004-programming-environment.mu'>https://github.com/akkartik/mu/blob/master/edit/004-programming-environment.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="SalientComment">## putting the environment together out of editors</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment"># Consists of one editor on the left for recipes and one on the right for the</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment"># sandbox.</span>
<span id="L5" class="LineNr"> 5 </span>
<span id="L6" class="LineNr"> 6 </span><span class="muRecipe">def!</span> main [
<span id="L7" class="LineNr"> 7 </span> <span class="Constant">local-scope</span>
<span id="L8" class="LineNr"> 8 </span> open-console
<span id="L9" class="LineNr"> 9 </span> <a href='../081print.mu.html#L46'>clear-screen</a><span class="Constant"> null/screen</span> <span class="Comment"># non-scrolling app</span>
<span id="L10" class="LineNr"> 10 </span> env:&:environment <span class="Special"><-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a><span class="Constant"> null/filesystem, null/screen</span>
<span id="L11" class="LineNr"> 11 </span> <a href='004-programming-environment.mu.html#L402'>render-all</a><span class="Constant"> null/screen,</span> env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L12" class="LineNr"> 12 </span> <a href='004-programming-environment.mu.html#L39'>event-loop</a><span class="Constant"> null/screen, null/console,</span> env,<span class="Constant"> null/filesystem</span>
<span id="L13" class="LineNr"> 13 </span>]
<span id="L14" class="LineNr"> 14 </span>
<span id="L15" class="LineNr"> 15 </span><span class="muData">container</span> environment [
<span id="L16" class="LineNr"> 16 </span> recipes:&:editor
<span id="L17" class="LineNr"> 17 </span> current-sandbox:&:editor
<span id="L18" class="LineNr"> 18 </span> sandbox-in-focus?:bool <span class="Comment"># false => cursor in recipes; true => cursor in current-sandbox</span>
<span id="L19" class="LineNr"> 19 </span>]
<span id="L20" class="LineNr"> 20 </span>
<span id="L21" class="LineNr"> 21 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>:&:<a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>:&:<a href='../081print.mu.html#L16'>screen</a>, test-sandbox-editor-contents:text<span class="muRecipe"> -> </span>result:&:environment [
<span id="L22" class="LineNr"> 22 </span> <span class="Constant">local-scope</span>
<span id="L23" class="LineNr"> 23 </span> <span class="Constant">load-inputs</span>
<span id="L24" class="LineNr"> 24 </span> width:num <span class="Special"><-</span> <a href='../081print.mu.html#L768'>screen-width</a> <a href='../081print.mu.html#L16'>screen</a>
<span id="L25" class="LineNr"> 25 </span> result <span class="Special"><-</span> new <span class="Constant">environment:type</span>
<span id="L26" class="LineNr"> 26 </span> <span class="Comment"># recipe editor on the left</span>
<span id="L27" class="LineNr"> 27 </span> initial-recipe-contents:text <span class="Special"><-</span> <a href='../088file.mu.html#L38'>slurp</a> <a href='../088file.mu.html#L11'>resources</a>, <span class="Constant">[lesson/recipes.mu]</span> <span class="Comment"># ignore errors</span>
<span id="L28" class="LineNr"> 28 </span> divider:num, _ <span class="Special"><-</span> divide-with-remainder width,<span class="Constant"> 2</span>
<span id="L29" class="LineNr"> 29 </span> recipes:&:editor <span class="Special"><-</span> <a href='001-editor.mu.html#L51'>new-editor</a> initial-recipe-contents, <span class="Constant">0/left</span>, divider/right
<span id="L30" class="LineNr"> 30 </span> <span class="Comment"># sandbox editor on the right</span>
<span id="L31" class="LineNr"> 31 </span> sandbox-left:num <span class="Special"><-</span> add divider,<span class="Constant"> 1</span>
<span id="L32" class="LineNr"> 32 </span> current-sandbox:&:editor <span class="Special"><-</span> <a href='001-editor.mu.html#L51'>new-editor</a> test-sandbox-editor-contents, sandbox-left, width/right
<span id="L33" class="LineNr"> 33 </span> *result <span class="Special"><-</span> put *result, <span class="Constant">recipes:offset</span>, recipes
<span id="L34" class="LineNr"> 34 </span> *result <span class="Special"><-</span> put *result, <span class="Constant">current-sandbox:offset</span>, current-sandbox
<span id="L35" class="LineNr"> 35 </span> *result <span class="Special"><-</span> put *result, <span class="Constant">sandbox-in-focus?:offset</span>,<span class="Constant"> false</span>
<span id="L36" class="LineNr"> 36 </span><span class="Constant"> <a href='004-programming-environment.mu.html#L36'><programming-environment-initialization></a></span>
<span id="L37" class="LineNr"> 37 </span>]
<span id="L38" class="LineNr"> 38 </span>
<span id="L39" class="LineNr"> 39 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>:&:<a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>:&:<a href='../084console.mu.html#L23'>console</a>, env:&:environment, <a href='../088file.mu.html#L11'>resources</a>:&:<a href='../088file.mu.html#L11'>resources</a><span class="muRecipe"> -> </span><a href='../081print.mu.html#L16'>screen</a>:&:<a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>:&:<a href='../084console.mu.html#L23'>console</a>, env:&:environment, <a href='../088file.mu.html#L11'>resources</a>:&:<a href='../088file.mu.html#L11'>resources</a> [
<span id="L40" class="LineNr"> 40 </span> <span class="Constant">local-scope</span>
<span id="L41" class="LineNr"> 41 </span> <span class="Constant">load-inputs</span>
<span id="L42" class="LineNr"> 42 </span> recipes:&:editor <span class="Special"><-</span> get *env, <span class="Constant">recipes:offset</span>
<span id="L43" class="LineNr"> 43 </span> current-sandbox:&:editor <span class="Special"><-</span> get *env, <span class="Constant">current-sandbox:offset</span>
<span id="L44" class="LineNr"> 44 </span> sandbox-in-focus?:bool <span class="Special"><-</span> get *env, <span class="Constant">sandbox-in-focus?:offset</span>
<span id="L45" class="LineNr"> 45 </span> <span class="Comment"># if we fall behind we'll stop updating the screen, but then we have to</span>
<span id="L46" class="LineNr"> 46 </span> <span class="Comment"># render the entire screen when we catch up.</span>
<span id="L47" class="LineNr"> 47 </span> <span class="Comment"># todo: test this</span>
<span id="L48" class="LineNr"> 48 </span> render-recipes-on-no-more-events?:bool <span class="Special"><-</span> copy<span class="Constant"> false</span>
<span id="L49" class="LineNr"> 49 </span> render-sandboxes-on-no-more-events?:bool <span class="Special"><-</span> copy<span class="Constant"> false</span>
<span id="L50" class="LineNr"> 50 </span> <span class="Delimiter">{</span>
<span id="L51" class="LineNr"> 51 </span> <span class="Comment"># looping over each (keyboard or touch) event as it occurs</span>
<span id="L52" class="LineNr"> 52 </span><span class="Constant"> +next-event</span>
<span id="L53" class="LineNr"> 53 </span> e:<a href='../084console.mu.html#L4'>event</a>, found?:bool, quit?:bool, <a href='../084console.mu.html#L23'>console</a> <span class="Special"><-</span> <a href='../084console.mu.html#L35'>read-event</a> <a href='../084console.mu.html#L23'>console</a>
<span id="L54" class="LineNr"> 54 </span> <span class="muControl">loop-unless</span> found?
<span id="L55" class="LineNr"> 55 </span> <span class="muControl">break-if</span> quit? <span class="Comment"># only in tests</span>
<span id="L56" class="LineNr"> 56 </span> trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[next-event]</span>
<span id="L57" class="LineNr"> 57 </span><span class="Constant"> <a href='004-programming-environment.mu.html#L57'><handle-event></a></span>
<span id="L58" class="LineNr"> 58 </span> <span class="Comment"># check for global events that will trigger regardless of which editor has focus</span>
<span id="L59" class="LineNr"> 59 </span> <span class="Delimiter">{</span>
<span id="L60" class="LineNr"> 60 </span> k:num, is-keycode?:bool <span class="Special"><-</span> maybe-convert e:<a href='../084console.mu.html#L4'>event</a>, <span class="Constant">keycode:variant</span>
<span id="L61" class="LineNr"> 61 </span> <span class="muControl">break-unless</span> is-keycode?
<span id="L62" class="LineNr"> 62 </span><span class="Constant"> <a href='004-programming-environment.mu.html#L62'><global-keypress></a></span>
<span id="L63" class="LineNr"> 63 </span> <span class="Delimiter">}</span>
<span id="L64" class="LineNr"> 64 </span> <span class="Delimiter">{</span>
<span id="L65" class="LineNr"> 65 </span> c:char, is-unicode?:bool <span class="Special"><-</span> maybe-convert e:<a href='../084console.mu.html#L4'>event</a>, <span class="Constant">text:variant</span>
<span id="L66" class="LineNr"> 66 </span> <span class="muControl">break-unless</span> is-unicode?
<span id="L67" class="LineNr"> 67 </span><span class="Constant"> <a href='004-programming-environment.mu.html#L67'><global-type></a></span>
<span id="L68" class="LineNr"> 68 </span> <span class="Delimiter">}</span>
<span id="L69" class="LineNr"> 69 </span> <span class="Comment"># 'touch' event - send to both sides, see what picks it up</span>
<span id="L70" class="LineNr"> 70 </span> <span class="Delimiter">{</span>
<span id="L71" class="LineNr"> 71 </span> t:<a href='../084console.mu.html#L12'>touch-event</a>, is-touch?:bool <span class="Special"><-</span> maybe-convert e:<a href='../084console.mu.html#L4'>event</a>, <span class="Constant">touch:variant</span>
<span id="L72" class="LineNr"> 72 </span> <span class="muControl">break-unless</span> is-touch?
<span id="L73" class="LineNr"> 73 </span> <span class="Comment"># ignore all but 'left-click' events for now</span>
<span id="L74" class="LineNr"> 74 </span> <span class="Comment"># todo: test this</span>
<span id="L75" class="LineNr"> 75 </span> touch-type:num <span class="Special"><-</span> get t, <span class="Constant">type:offset</span>
<span id="L76" class="LineNr"> 76 </span> is-left-click?:bool <span class="Special"><-</span> equal touch-type, <span class="Constant">65513/mouse-left</span>
<span id="L77" class="LineNr"> 77 </span> <span class="muControl">loop-unless</span> is-left-click?, <span class="Constant">+next-event</span>
<span id="L78" class="LineNr"> 78 </span> click-row:num <span class="Special"><-</span> get t, <span class="Constant">row:offset</span>
<span id="L79" class="LineNr"> 79 </span> click-column:num <span class="Special"><-</span> get t, <span class="Constant">column:offset</span>
<span id="L80" class="LineNr"> 80 </span> <span class="Comment"># later exceptions for non-editor touches will go here</span>
<span id="L81" class="LineNr"> 81 </span><span class="Constant"> <a href='004-programming-environment.mu.html#L81'><global-touch></a></span>
<span id="L82" class="LineNr"> 82 </span> <span class="Comment"># send to both editors</span>
<span id="L83" class="LineNr"> 83 </span> _ <span class="Special"><-</span> move-cursor recipes, <a href='../081print.mu.html#L16'>screen</a>, t
<span id="L84" class="LineNr"> 84 </span> sandbox-in-focus?:bool <span class="Special"><-</span> move-cursor current-sandbox, <a href='../081print.mu.html#L16'>screen</a>, t
<span id="L85" class="LineNr"> 85 </span> *env <span class="Special"><-</span> put *env, <span class="Constant">sandbox-in-focus?:offset</span>, sandbox-in-focus?
<span id="L86" class="LineNr"> 86 </span> <a href='../081print.mu.html#L16'>screen</a> <span class="Special"><-</span> <a href='004-programming-environment.mu.html#L468'>update-cursor</a> <a href='../081print.mu.html#L16'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
<span id="L87" class="LineNr"> 87 </span> <span class="muControl"> loop</span> <span class="Constant">+next-event</span>
<span id="L88" class="LineNr"> 88 </span> <span class="Delimiter">}</span>
<span id="L89" class="LineNr"> 89 </span> <span class="Comment"># 'resize' event - redraw editor</span>
<span id="L90" class="LineNr"> 90 </span> <span class="Comment"># todo: test this after supporting resize in assume-console</span>
<span id="L91" class="LineNr"> 91 </span> <span class="Delimiter">{</span>
<span id="L92" class="LineNr"> 92 </span> r:<a href='../084console.mu.html#L18'>resize-event</a>, is-resize?:bool <span class="Special"><-</span> maybe-convert e:<a href='../084console.mu.html#L4'>event</a>, <span class="Constant"><a href='004-programming-environment.mu.html#L131'>resize</a>:variant</span>
<span id="L93" class="LineNr"> 93 </span> <span class="muControl">break-unless</span> is-resize?
<span id="L94" class="LineNr"> 94 </span> env, <a href='../081print.mu.html#L16'>screen</a> <span class="Special"><-</span> <a href='004-programming-environment.mu.html#L131'>resize</a> <a href='../081print.mu.html#L16'>screen</a>, env
<span id="L95" class="LineNr"> 95 </span> <a href='../081print.mu.html#L16'>screen</a> <span class="Special"><-</span> <a href='004-programming-environment.mu.html#L402'>render-all</a> <a href='../081print.mu.html#L16'>screen</a>, env, <a href='004-programming-environment.mu.html#L158'>render-without-moving-cursor</a>
<span id="L96" class="LineNr"> 96 </span> <span class="muControl"> loop</span> <span class="Constant">+next-event</span>
<span id="L97" class="LineNr"> 97 </span> <span class="Delimiter">}</span>
<span id="L98" class="LineNr"> 98 </span> <span class="Comment"># if it's not global and not a touch event, send to appropriate editor</span>
<span id="L99" class="LineNr"> 99 </span> <span class="Delimiter">{</span>
<span id="L100" class="LineNr">100 </span> sandbox-in-focus?:bool <span class="Special"><-</span> get *env, <span class="Constant">sandbox-in-focus?:offset</span>
<span id="L101" class="LineNr">101 </span> <span class="Delimiter">{</span>
<span id="L102" class="LineNr">102 </span> <span class="muControl">break-if</span> sandbox-in-focus?
<span id="L103" class="LineNr">103 </span> render?:bool <span class="Special"><-</span> <a href='002-typing.mu.html#L166'>handle-keyboard-event</a> <a href='../081print.mu.html#L16'>screen</a>, recipes, e:<a href='../084console.mu.html#L4'>event</a>
<span id="L104" class="LineNr">104 </span> render-recipes-on-no-more-events? <span class="Special"><-</span> or render?, render-recipes-on-no-more-events?
<span id="L105" class="LineNr">105 </span> <span class="Delimiter">}</span>
<span id="L106" class="LineNr">106 </span> <span class="Delimiter">{</span>
<span id="L107" class="LineNr">107 </span> <span class="muControl">break-unless</span> sandbox-in-focus?
<span id="L108" class="LineNr">108 </span> render?:bool <span class="Special"><-</span> <a href='002-typing.mu.html#L166'>handle-keyboard-event</a> <a href='../081print.mu.html#L16'>screen</a>, current-sandbox, e:<a href='../084console.mu.html#L4'>event</a>
<span id="L109" class="LineNr">109 </span> render-sandboxes-on-no-more-events? <span class="Special"><-</span> or render?, render-sandboxes-on-no-more-events?
<span id="L110" class="LineNr">110 </span> <span class="Delimiter">}</span>
<span id="L111" class="LineNr">111 </span> more-events?:bool <span class="Special"><-</span> <a href='../084console.mu.html#L99'>has-more-events?</a> <a href='../084console.mu.html#L23'>console</a>
<span id="L112" class="LineNr">112 </span> <span class="Delimiter">{</span>
<span id="L113" class="LineNr">113 </span> <span class="muControl">break-if</span> more-events?
<span id="L114" class="LineNr">114 </span> <span class="Delimiter">{</span>
<span id="L115" class="LineNr">115 </span> <span class="muControl">break-unless</span> render-recipes-on-no-more-events?
<span id="L116" class="LineNr">116 </span> render-recipes-on-no-more-events? <span class="Special"><-</span> copy<span class="Constant"> false</span>
<span id="L117" class="LineNr">117 </span> <a href='../081print.mu.html#L16'>screen</a> <span class="Special"><-</span> <a href='004-programming-environment.mu.html#L431'>render-recipes</a> <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L118" class="LineNr">118 </span> <span class="Delimiter">}</span>
<span id="L119" class="LineNr">119 </span> <span class="Delimiter">{</span>
<span id="L120" class="LineNr">120 </span> <span class="muControl">break-unless</span> render-sandboxes-on-no-more-events?
<span id="L121" class="LineNr">121 </span> render-sandboxes-on-no-more-events? <span class="Special"><-</span> copy<span class="Constant"> false</span>
<span id="L122" class="LineNr">122 </span> <a href='../081print.mu.html#L16'>screen</a> <span class="Special"><-</span> render-sandbox-side <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L123" class="LineNr">123 </span> <span class="Delimiter">}</span>
<span id="L124" class="LineNr">124 </span> <span class="Delimiter">}</span>
<span id="L125" class="LineNr">125 </span> <a href='../081print.mu.html#L16'>screen</a> <span class="Special"><-</span> <a href='004-programming-environment.mu.html#L468'>update-cursor</a> <a href='../081print.mu.html#L16'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
<span id="L126" class="LineNr">126 </span> <span class="Delimiter">}</span>
<span id="L127" class="LineNr">127 </span> <span class="muControl"> loop</span>
<span id="L128" class="LineNr">128 </span> <span class="Delimiter">}</span>
<span id="L129" class="LineNr">129 </span>]
<span id="L130" class="LineNr">130 </span>
<span id="L131" class="LineNr">131 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L131'>resize</a> <a href='../081print.mu.html#L16'>screen</a>:&:<a href='../081print.mu.html#L16'>screen</a>, env:&:environment<span class="muRecipe"> -> </span>env:&:environment, <a href='../081print.mu.html#L16'>screen</a>:&:<a href='../081print.mu.html#L16'>screen</a> [
<span id="L132" class="LineNr">132 </span> <span class="Constant">local-scope</span>
<span id="L133" class="LineNr">133 </span> <span class="Constant">load-inputs</span>
<span id="L134" class="LineNr">134 </span> <a href='../081print.mu.html#L46'>clear-screen</a> <a href='../081print.mu.html#L16'>screen</a> <span class="Comment"># update screen dimensions</span>
<span id="L135" class="LineNr">135 </span> width:num <span class="Special"><-</span> <a href='../081print.mu.html#L768'>screen-width</a> <a href='../081print.mu.html#L16'>screen</a>
<span id="L136" class="LineNr">136 </span> divider:num, _ <span class="Special"><-</span> divide-with-remainder width,<span class="Constant"> 2</span>
<span id="L137" class="LineNr">137 </span> <span class="Comment"># update recipe editor</span>
<span id="L138" class="LineNr">138 </span> recipes:&:editor <span class="Special"><-</span> get *env, <span class="Constant">recipes:offset</span>
<span id="L139" class="LineNr">139 </span> right:num <span class="Special"><-</span> subtract divider,<span class="Constant"> 1</span>
<span id="L140" class="LineNr">140 </span> *recipes <span class="Special"><-</span> put *recipes, <span class="Constant">right:offset</span>, right
<span id="L141" class="LineNr">141 </span> <span class="Comment"># reset cursor (later we'll try to preserve its position)</span>
<span id="L142" class="LineNr">142 </span> *recipes <span class="Special"><-</span> put *recipes, <span class="Constant">cursor-row:offset</span>,<span class="Constant"> 1</span>
<span id="L143" class="LineNr">143 </span> *recipes <span class="Special"><-</span> put *recipes, <span class="Constant">cursor-column:offset</span>,<span class="Constant"> 0</span>
<span id="L144" class="LineNr">144 </span> <span class="Comment"># update sandbox editor</span>
<span id="L145" class="LineNr">145 </span> current-sandbox:&:editor <span class="Special"><-</span> get *env, <span class="Constant">current-sandbox:offset</span>
<span id="L146" class="LineNr">146 </span> left:num <span class="Special"><-</span> add divider,<span class="Constant"> 1</span>
<span id="L147" class="LineNr">147 </span> *current-sandbox <span class="Special"><-</span> put *current-sandbox, <span class="Constant">left:offset</span>, left
<span id="L148" class="LineNr">148 </span> right:num <span class="Special"><-</span> subtract width,<span class="Constant"> 1</span>
<span id="L149" class="LineNr">149 </span> *current-sandbox <span class="Special"><-</span> put *current-sandbox, <span class="Constant">right:offset</span>, right
<span id="L150" class="LineNr">150 </span> <span class="Comment"># reset cursor (later we'll try to preserve its position)</span>
<span id="L151" class="LineNr">151 </span> *current-sandbox <span class="Special"><-</span> put *current-sandbox, <span class="Constant">cursor-row:offset</span>,<span class="Constant"> 1</span>
<span id="L152" class="LineNr">152 </span> *current-sandbox <span class="Special"><-</span> put *current-sandbox, <span class="Constant">cursor-column:offset</span>, left
<span id="L153" class="LineNr">153 </span>]
<span id="L154" class="LineNr">154 </span>
<span id="L155" class="LineNr">155 </span><span class="Comment"># Variant of 'render' that updates cursor-row and cursor-column based on</span>
<span id="L156" class="LineNr">156 </span><span class="Comment"># before-cursor (rather than the other way around). If before-cursor moves</span>
<span id="L157" class="LineNr">157 </span><span class="Comment"># off-screen, it resets cursor-row and cursor-column.</span>
<span id="L158" class="LineNr">158 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L158'>render-without-moving-cursor</a> <a href='../081print.mu.html#L16'>screen</a>:&:<a href='../081print.mu.html#L16'>screen</a>, editor:&:editor<span class="muRecipe"> -> </span>last-row:num, last-column:num, <a href='../081print.mu.html#L16'>screen</a>:&:<a href='../081print.mu.html#L16'>screen</a>, editor:&:editor [
<span id="L159" class="LineNr">159 </span> <span class="Constant">local-scope</span>
<span id="L160" class="LineNr">160 </span> <span class="Constant">load-inputs</span>
<span id="L161" class="LineNr">161 </span> <span class="muControl">return-unless</span> editor, <span class="Constant">1/top</span>, <span class="Constant">0/left</span>
<span id="L162" class="LineNr">162 </span> left:num <span class="Special"><-</span> get *editor, <span class="Constant">left:offset</span>
<span id="L163" class="LineNr">163 </span> <a href='../081print.mu.html#L782'>screen-height</a>:num <span class="Special"><-</span> <a href='../081print.mu.html#L782'>screen-height</a> <a href='../081print.mu.html#L16'>screen</a>
<span id="L164" class="LineNr">164 </span> right:num <span class="Special"><-</span> get *editor, <span class="Constant">right:offset</span>
<span id="L165" class="LineNr">165 </span> curr:&:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special"><-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
<span id="L166" class="LineNr">166 </span> <a href='../065duplex_list.mu.html#L38'>prev</a>:&:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special"><-</span> copy curr <span class="Comment"># just in case curr becomes null and we can't compute prev</span>
<span id="L167" class="LineNr">167 </span> curr <span class="Special"><-</span> <a href='../065duplex_list.mu.html#L31'>next</a> curr
<span id="L168" class="LineNr">168 </span> color:num <span class="Special"><-</span> copy <span class="Constant">7/white</span>
<span id="L169" class="LineNr">169 </span> row:num <span class="Special"><-</span> copy <span class="Constant">1/top</span>
<span id="L170" class="LineNr">170 </span> column:num <span class="Special"><-</span> copy left
<span id="L171" class="LineNr">171 </span> <span class="Comment"># save before-cursor</span>
<span id="L172" class="LineNr">172 </span> old-before-cursor:&:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special"><-</span> get *editor, <span class="Constant">before-cursor:offset</span>
<span id="L173" class="LineNr">173 </span> <span class="Comment"># initialze cursor-row/cursor-column/before-cursor to the top of the screen</span>
<span id="L174" class="LineNr">174 </span> <span class="Comment"># by default</span>
<span id="L175" class="LineNr">175 </span> *editor <span class="Special"><-</span> put *editor, <span class="Constant">cursor-row:offset</span>, row
<span id="L176" class="LineNr">176 </span> *editor <span class="Special"><-</span> put *editor, <span class="Constant">cursor-column:offset</span>, column
<span id="L177" class="LineNr">177 </span> top-of-screen:&:<a href='../065duplex_list.mu.html#L3'>duplex-list</a>:char <span class="Special"><-</span> get *editor, <span class="Constant">top-of-screen:offset</span>
<span id="L178" class="LineNr">178 </span> *editor <span class="Special"><-</span> put *editor, <span class="Constant">before-cursor:offset</span>, top-of-screen
<span id="L179" class="LineNr">179 </span> <a href='../081print.mu.html#L16'>screen</a> <span class="Special"><-</span> move-cursor <a href='../081print.mu.html#L16'>screen</a>, row, column
<span id="L180" class="LineNr">180 </span> <span class="Delimiter">{</span>
<span id="L181" class="LineNr">181 </span><span class="Constant"> +next-character</span>
<span id="L182" class="LineNr">182 </span> <span class="muControl">break-unless</span> curr
<span id="L183" class="LineNr">183 </span> off-screen?:bool <span class="Special"><-</span> greater-or-equal row, <a href='../081print.mu.html#L782'>screen-height</a>
<span id="L184" class="LineNr">184 </span> <span class="muControl">break-if</span> off-screen?
<span id="L185" class="LineNr">185 </span> <span class="Comment"># if we find old-before-cursor still on the new resized screen, update</span>
<span id="L186" class="LineNr">186 </span> <span class="Comment"># editor.cursor-row and editor.cursor-column based on</span>
<span id="L187" class="LineNr">187 </span> <span class="Comment"># old-before-cursor</span>
<span id="L188" class="LineNr">188 </span> <span class="Delimiter">{</span>
<span id="L189" class="LineNr">189 </span> at-cursor?:bool <span class="Special"><-</span> equal old-before-cursor, <a href='../065duplex_list.mu.html#L38'>prev</a>
<span id="L190" class="LineNr">190 </span> <span class="muControl">break-unless</span> at-cursor?
<span id="L191" class="LineNr">191 </span> *editor <span class="Special"><-</span> put *editor, <span class="Constant">cursor-row:offset</span>, row
<span id="L192" class="LineNr">192 </span> *editor <span class="Special"><-</span> put *editor, <span class="Constant">cursor-column:offset</span>, column
<span id="L193" class="LineNr">193 </span> *editor <span class="Special"><-</span> put *editor, <span class="Constant">before-cursor:offset</span>, old-before-cursor
<span id="L194" class="LineNr">194 </span> <span class="Delimiter">}</span>
<span id="L195" class="LineNr">195 </span> c:char <span class="Special"><-</span> get *curr, <span class="Constant">value:offset</span>
<span id="L196" class="LineNr">196 </span><span class="Constant"> <character-c-received></span>
<span id="L197" class="LineNr">197 </span> <span class="Delimiter">{</span>
<span id="L198" class="LineNr">198 </span> <span class="Comment"># newline? move to left rather than 0</span>
<span id="L199" class="LineNr">199 </span> newline?:bool <span class="Special"><-</span> equal c, <span class="Constant">10/newline</span>
<span id="L200" class="LineNr">200 </span> <span class="muControl">break-unless</span> newline?
<span id="L201" class="LineNr">201 </span> <span class="Comment"># clear rest of line in this window</span>
<span id="L202" class="LineNr">202 </span> <a href='../081print.mu.html#L553'>clear-line-until</a> <a href='../081print.mu.html#L16'>screen</a>, right
<span id="L203" class="LineNr">203 </span> <span class="Comment"># skip to next line</span>
<span id="L204" class="LineNr">204 </span> row <span class="Special"><-</span> add row,<span class="Constant"> 1</span>
<span id="L205" class="LineNr">205 </span> column <span class="Special"><-</span> copy left
<span id="L206" class="LineNr">206 </span> <a href='../081print.mu.html#L16'>screen</a> <span class="Special"><-</span> move-cursor <a href='../081print.mu.html#L16'>screen</a>, row, column
<span id="L207" class="LineNr">207 </span> curr <span class="Special"><-</span> <a href='../065duplex_list.mu.html#L31'>next</a> curr
<span id="L208" class="LineNr">208 </span> <a href='../065duplex_list.mu.html#L38'>prev</a> <span class="Special"><-</span> <a href='../065duplex_list.mu.html#L31'>next</a> <a href='../065duplex_list.mu.html#L38'>prev</a>
<span id="L209" class="LineNr">209 </span> <span class="muControl"> loop</span> <span class="Constant">+next-character</span>
<span id="L210" class="LineNr">210 </span> <span class="Delimiter">}</span>
<span id="L211" class="LineNr">211 </span> <span class="Delimiter">{</span>
<span id="L212" class="LineNr">212 </span> <span class="Comment"># at right? wrap. even if there's only one more letter left; we need</span>
<span id="L213" class="LineNr">213 </span> <span class="Comment"># room for clicking on the cursor after it.</span>
<span id="L214" class="LineNr">214 </span> at-right?:bool <span class="Special"><-</span> equal column, right
<span id="L215" class="LineNr">215 </span> <span class="muControl">break-unless</span> at-right?
<span id="L216" class="LineNr">216 </span> <span class="Comment"># print wrap icon</span>
<span id="L217" class="LineNr">217 </span> wrap-icon:char <span class="Special"><-</span> copy <span class="Constant">8617/loop-back-to-left</span>
<span id="L218" class="LineNr">218 </span> print <a href='../081print.mu.html#L16'>screen</a>, wrap-icon, <span class="Constant">245/grey</span>
<span id="L219" class="LineNr">219 </span> column <span class="Special"><-</span> copy left
<span id="L220" class="LineNr">220 </span> row <span class="Special"><-</span> add row,<span class="Constant"> 1</span>
<span id="L221" class="LineNr">221 </span> <a href='../081print.mu.html#L16'>screen</a> <span class="Special"><-</span> move-cursor <a href='../081print.mu.html#L16'>screen</a>, row, column
<span id="L222" class="LineNr">222 </span> <span class="Comment"># don't increment curr</span>
<span id="L223" class="LineNr">223 </span> <span class="muControl"> loop</span> <span class="Constant">+next-character</span>
<span id="L224" class="LineNr">224 </span> <span class="Delimiter">}</span>
<span id="L225" class="LineNr">225 </span> print <a href='../081print.mu.html#L16'>screen</a>, c, color
<span id="L226" class="LineNr">226 </span> curr <span class="Special"><-</span> <a href='../065duplex_list.mu.html#L31'>next</a> curr
<span id="L227" class="LineNr">227 </span> <a href='../065duplex_list.mu.html#L38'>prev</a> <span class="Special"><-</span> <a href='../065duplex_list.mu.html#L31'>next</a> <a href='../065duplex_list.mu.html#L38'>prev</a>
<span id="L228" class="LineNr">228 </span> column <span class="Special"><-</span> add column,<span class="Constant"> 1</span>
<span id="L229" class="LineNr">229 </span> <span class="muControl"> loop</span>
<span id="L230" class="LineNr">230 </span> <span class="Delimiter">}</span>
<span id="L231" class="LineNr">231 </span> <span class="Comment"># save first character off-screen</span>
<span id="L232" class="LineNr">232 </span> *editor <span class="Special"><-</span> put *editor, <span class="Constant">bottom-of-screen:offset</span>, curr
<span id="L233" class="LineNr">233 </span> *editor <span class="Special"><-</span> put *editor, <span class="Constant">bottom:offset</span>, row
<span id="L234" class="LineNr">234 </span> <span class="muControl"> return</span> row, column
<span id="L235" class="LineNr">235 </span>]
<span id="L236" class="LineNr">236 </span>
<span id="L237" class="LineNr">237 </span><span class="muScenario">scenario</span> point-at-multiple-editors [
<span id="L238" class="LineNr">238 </span> <span class="Constant">local-scope</span>
<span id="L239" class="LineNr">239 </span> trace-until <span class="Constant">100/app</span> <span class="Comment"># trace too long</span>
<span id="L240" class="LineNr">240 </span> assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
<span id="L241" class="LineNr">241 </span> <span class="Comment"># initialize both halves of screen</span>
<span id="L242" class="LineNr">242 </span> assume-resources [
<span id="L243" class="LineNr">243 </span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special"><-</span> [
<span id="L244" class="LineNr">244 </span><span class="Constant"> |abc|</span>
<span id="L245" class="LineNr">245 </span> ]
<span id="L246" class="LineNr">246 </span> ]
<span id="L247" class="LineNr">247 </span> env:&:environment <span class="Special"><-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[def]</span> <span class="Comment"># contents of sandbox editor</span>
<span id="L248" class="LineNr">248 </span> <span class="Comment"># focus on both sides</span>
<span id="L249" class="LineNr">249 </span> assume-console [
<span id="L250" class="LineNr">250 </span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
<span id="L251" class="LineNr">251 </span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 17</span>
<span id="L252" class="LineNr">252 </span> ]
<span id="L253" class="LineNr">253 </span> <span class="Comment"># check cursor column in each</span>
<span id="L254" class="LineNr">254 </span> run [
<span id="L255" class="LineNr">255 </span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L256" class="LineNr">256 </span> recipes:&:editor <span class="Special"><-</span> get *env, <span class="Constant">recipes:offset</span>
<span id="L257" class="LineNr">257 </span> 5:num/<span class="Special">raw</span> <span class="Special"><-</span> get *recipes, <span class="Constant">cursor-column:offset</span>
<span id="L258" class="LineNr">258 </span> sandbox:&:editor <span class="Special"><-</span> get *env, <span class="Constant">current-sandbox:offset</span>
<span id="L259" class="LineNr">259 </span> 7:num/<span class="Special">raw</span> <span class="Special"><-</span> get *sandbox, <span class="Constant">cursor-column:offset</span>
<span id="L260" class="LineNr">260 </span> ]
<span id="L261" class="LineNr">261 </span> memory-should-contain [
<span id="L262" class="LineNr">262 </span> <span class="Constant"> 5</span> <span class="Special"><-</span><span class="Constant"> 1</span>
<span id="L263" class="LineNr">263 </span> <span class="Constant"> 7</span> <span class="Special"><-</span><span class="Constant"> 17</span>
<span id="L264" class="LineNr">264 </span> ]
<span id="L265" class="LineNr">265 </span>]
<span id="L266" class="LineNr">266 </span>
<span id="L267" class="LineNr">267 </span><span class="muScenario">scenario</span> edit-multiple-editors [
<span id="L268" class="LineNr">268 </span> <span class="Constant">local-scope</span>
<span id="L269" class="LineNr">269 </span> trace-until <span class="Constant">100/app</span> <span class="Comment"># trace too long</span>
<span id="L270" class="LineNr">270 </span> assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
<span id="L271" class="LineNr">271 </span> <span class="Comment"># initialize both halves of screen</span>
<span id="L272" class="LineNr">272 </span> assume-resources [
<span id="L273" class="LineNr">273 </span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special"><-</span> [
<span id="L274" class="LineNr">274 </span><span class="Constant"> |abc|</span>
<span id="L275" class="LineNr">275 </span> ]
<span id="L276" class="LineNr">276 </span> ]
<span id="L277" class="LineNr">277 </span> env:&:environment <span class="Special"><-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[def]</span> <span class="Comment"># contents of sandbox</span>
<span id="L278" class="LineNr">278 </span> <a href='004-programming-environment.mu.html#L402'>render-all</a> <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L279" class="LineNr">279 </span> <span class="Comment"># type one letter in each of them</span>
<span id="L280" class="LineNr">280 </span> assume-console [
<span id="L281" class="LineNr">281 </span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 1</span>
<span id="L282" class="LineNr">282 </span> type <span class="Constant">[0]</span>
<span id="L283" class="LineNr">283 </span> left-click<span class="Constant"> 1</span>,<span class="Constant"> 17</span>
<span id="L284" class="LineNr">284 </span> type <span class="Constant">[1]</span>
<span id="L285" class="LineNr">285 </span> ]
<span id="L286" class="LineNr">286 </span> run [
<span id="L287" class="LineNr">287 </span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L288" class="LineNr">288 </span> recipes:&:editor <span class="Special"><-</span> get *env, <span class="Constant">recipes:offset</span>
<span id="L289" class="LineNr">289 </span> 5:num/<span class="Special">raw</span> <span class="Special"><-</span> get *recipes, <span class="Constant">cursor-column:offset</span>
<span id="L290" class="LineNr">290 </span> sandbox:&:editor <span class="Special"><-</span> get *env, <span class="Constant">current-sandbox:offset</span>
<span id="L291" class="LineNr">291 </span> 7:num/<span class="Special">raw</span> <span class="Special"><-</span> get *sandbox, <span class="Constant">cursor-column:offset</span>
<span id="L292" class="LineNr">292 </span> ]
<span id="L293" class="LineNr">293 </span> screen-should-contain [
<span id="L294" class="LineNr">294 </span> <span class="Constant"> . run (F4) . # this line has a different background, but we don't test that yet</span>
<span id="L295" class="LineNr">295 </span> <span class="Constant"> .a0bc ╎d1ef .</span>
<span id="L296" class="LineNr">296 </span> <span class="Constant"> . ╎──────────────.</span>
<span id="L297" class="LineNr">297 </span> <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎ .</span>
<span id="L298" class="LineNr">298 </span> <span class="Constant"> . ╎ .</span>
<span id="L299" class="LineNr">299 </span> ]
<span id="L300" class="LineNr">300 </span> memory-should-contain [
<span id="L301" class="LineNr">301 </span> <span class="Constant"> 5</span> <span class="Special"><-</span><span class="Constant"> 2</span> <span class="Comment"># cursor column of recipe editor</span>
<span id="L302" class="LineNr">302 </span> <span class="Constant"> 7</span> <span class="Special"><-</span><span class="Constant"> 18</span> <span class="Comment"># cursor column of sandbox editor</span>
<span id="L303" class="LineNr">303 </span> ]
<span id="L304" class="LineNr">304 </span> <span class="Comment"># show the cursor at the right window</span>
<span id="L305" class="LineNr">305 </span> run [
<span id="L306" class="LineNr">306 </span> cursor:char <span class="Special"><-</span> copy <span class="Constant">9251/␣</span>
<span id="L307" class="LineNr">307 </span> print <a href='../081print.mu.html#L16'>screen</a>, cursor
<span id="L308" class="LineNr">308 </span> ]
<span id="L309" class="LineNr">309 </span> screen-should-contain [
<span id="L310" class="LineNr">310 </span> <span class="Constant"> . run (F4) .</span>
<span id="L311" class="LineNr">311 </span> <span class="Constant"> .a0bc ╎d1␣f .</span>
<span id="L312" class="LineNr">312 </span> <span class="Constant"> . ╎──────────────.</span>
<span id="L313" class="LineNr">313 </span> <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎ .</span>
<span id="L314" class="LineNr">314 </span> <span class="Constant"> . ╎ .</span>
<span id="L315" class="LineNr">315 </span> ]
<span id="L316" class="LineNr">316 </span>]
<span id="L317" class="LineNr">317 </span>
<span id="L318" class="LineNr">318 </span><span class="muScenario">scenario</span> editor-in-focus-keeps-cursor [
<span id="L319" class="LineNr">319 </span> <span class="Constant">local-scope</span>
<span id="L320" class="LineNr">320 </span> trace-until <span class="Constant">100/app</span> <span class="Comment"># trace too long</span>
<span id="L321" class="LineNr">321 </span> assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
<span id="L322" class="LineNr">322 </span> assume-resources [
<span id="L323" class="LineNr">323 </span> <span class="Constant">[lesson/recipes.mu]</span> <span class="Special"><-</span> [
<span id="L324" class="LineNr">324 </span><span class="Constant"> |abc|</span>
<span id="L325" class="LineNr">325 </span> ]
<span id="L326" class="LineNr">326 </span> ]
<span id="L327" class="LineNr">327 </span> env:&:environment <span class="Special"><-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[def]</span>
<span id="L328" class="LineNr">328 </span> <a href='004-programming-environment.mu.html#L402'>render-all</a> <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L329" class="LineNr">329 </span> <span class="Comment"># initialize programming environment and highlight cursor</span>
<span id="L330" class="LineNr">330 </span> assume-console <span class="Constant">[]</span>
<span id="L331" class="LineNr">331 </span> run [
<span id="L332" class="LineNr">332 </span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L333" class="LineNr">333 </span> cursor:char <span class="Special"><-</span> copy <span class="Constant">9251/␣</span>
<span id="L334" class="LineNr">334 </span> print <a href='../081print.mu.html#L16'>screen</a>, cursor
<span id="L335" class="LineNr">335 </span> ]
<span id="L336" class="LineNr">336 </span> <span class="Comment"># is cursor at the right place?</span>
<span id="L337" class="LineNr">337 </span> screen-should-contain [
<span id="L338" class="LineNr">338 </span> <span class="Constant"> . run (F4) .</span>
<span id="L339" class="LineNr">339 </span> <span class="Constant"> .␣bc ╎def .</span>
<span id="L340" class="LineNr">340 </span> <span class="Constant"> . ╎──────────────.</span>
<span id="L341" class="LineNr">341 </span> <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎ .</span>
<span id="L342" class="LineNr">342 </span> <span class="Constant"> . ╎ .</span>
<span id="L343" class="LineNr">343 </span> ]
<span id="L344" class="LineNr">344 </span> <span class="Comment"># now try typing a letter</span>
<span id="L345" class="LineNr">345 </span> assume-console [
<span id="L346" class="LineNr">346 </span> type <span class="Constant">[z]</span>
<span id="L347" class="LineNr">347 </span> ]
<span id="L348" class="LineNr">348 </span> run [
<span id="L349" class="LineNr">349 </span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L350" class="LineNr">350 </span> cursor:char <span class="Special"><-</span> copy <span class="Constant">9251/␣</span>
<span id="L351" class="LineNr">351 </span> print <a href='../081print.mu.html#L16'>screen</a>, cursor
<span id="L352" class="LineNr">352 </span> ]
<span id="L353" class="LineNr">353 </span> <span class="Comment"># cursor should still be right</span>
<span id="L354" class="LineNr">354 </span> screen-should-contain [
<span id="L355" class="LineNr">355 </span> <span class="Constant"> . run (F4) .</span>
<span id="L356" class="LineNr">356 </span> <span class="Constant"> .z␣bc ╎def .</span>
<span id="L357" class="LineNr">357 </span> <span class="Constant"> . ╎──────────────.</span>
<span id="L358" class="LineNr">358 </span> <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎ .</span>
<span id="L359" class="LineNr">359 </span> <span class="Constant"> . ╎ .</span>
<span id="L360" class="LineNr">360 </span> ]
<span id="L361" class="LineNr">361 </span>]
<span id="L362" class="LineNr">362 </span>
<span id="L363" class="LineNr">363 </span><span class="muScenario">scenario</span> backspace-in-sandbox-editor-joins-lines [
<span id="L364" class="LineNr">364 </span> <span class="Constant">local-scope</span>
<span id="L365" class="LineNr">365 </span> trace-until <span class="Constant">100/app</span> <span class="Comment"># trace too long</span>
<span id="L366" class="LineNr">366 </span> assume-screen <span class="Constant">30/width</span>, <span class="Constant">5/height</span>
<span id="L367" class="LineNr">367 </span> assume-resources [
<span id="L368" class="LineNr">368 </span> ]
<span id="L369" class="LineNr">369 </span> <span class="Comment"># initialize sandbox side with two lines</span>
<span id="L370" class="LineNr">370 </span> test-sandbox-editor-contents:text <span class="Special"><-</span> new <span class="Constant">[abc</span>
<span id="L371" class="LineNr">371 </span><span class="Constant">def]</span>
<span id="L372" class="LineNr">372 </span> env:&:environment <span class="Special"><-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>, test-sandbox-editor-contents
<span id="L373" class="LineNr">373 </span> <a href='004-programming-environment.mu.html#L402'>render-all</a> <a href='../081print.mu.html#L16'>screen</a>, env, <a href='001-editor.mu.html#L109'>render</a>
<span id="L374" class="LineNr">374 </span> screen-should-contain [
<span id="L375" class="LineNr">375 </span> <span class="Constant"> . run (F4) .</span>
<span id="L376" class="LineNr">376 </span> <span class="Constant"> . ╎abc .</span>
<span id="L377" class="LineNr">377 </span> <span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎def .</span>
<span id="L378" class="LineNr">378 </span> <span class="Constant"> . ╎──────────────.</span>
<span id="L379" class="LineNr">379 </span> <span class="Constant"> . ╎ .</span>
<span id="L380" class="LineNr">380 </span> ]
<span id="L381" class="LineNr">381 </span> <span class="Comment"># position cursor at start of second line and hit backspace</span>
<span id="L382" class="LineNr">382 </span> assume-console [
<span id="L383" class="LineNr">383 </span> left-click<span class="Constant"> 2</span>,<span class="Constant"> 16</span>
<span id="L384" class="LineNr">384 </span> press backspace
<span id="L385" class="LineNr">385 </span> ]
<span id="L386" class="LineNr">386 </span> run [
<span id="L387" class="LineNr">387 </span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L388" class="LineNr">388 </span> cursor:char <span class="Special"><-</span> copy <span class="Constant">9251/␣</span>
<span id="L389" class="LineNr">389 </span> print <a href='../081print.mu.html#L16'>screen</a>, cursor
<span id="L390" class="LineNr">390 </span> ]
<span id="L391" class="LineNr">391 </span> <span class="Comment"># cursor moves to end of old line</span>
<span id="L392" class="LineNr">392 </span> screen-should-contain [
<span id="L393" class="LineNr">393 </span> <span class="Constant"> . run (F4) .</span>
<span id="L394" class="LineNr">394 </span> <span class="Constant"> . ╎abc␣ef .</span>
<span id="L395" class="LineNr">395 </span><span class="Constant"> .╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╎──────────────.</span>
<span id="L396" class="LineNr">396 </span> <span class="Constant"> . ╎ .</span>
<span id="L397" class="LineNr">397 </span> ]
<span id="L398" class="LineNr">398 </span>]
<span id="L399" class="LineNr">399 </span>
<span id="L400" class="LineNr">400 </span><span class="muData">type</span> <a href='004-programming-environment.mu.html#L400'>render-recipe</a> = (recipe (address screen) (address editor)<span class="muRecipe"> -> </span>number number (address screen) (address editor))
<span id="L401" class="LineNr">401 </span>
<span id="L402" class="LineNr">402 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L402'>render-all</a> <a href='../081print.mu.html#L16'>screen</a>:&:<a href='../081print.mu.html#L16'>screen</a>, env:&:environment, render-editor:<a href='004-programming-environment.mu.html#L400'>render-recipe</a><span class="muRecipe"> -> </span><a href='../081print.mu.html#L16'>screen</a>:&:<a href='../081print.mu.html#L16'>screen</a>, env:&:environment [
<span id="L403" class="LineNr">403 </span> <span class="Constant">local-scope</span>
<span id="L404" class="LineNr">404 </span> <span class="Constant">load-inputs</span>
<span id="L405" class="LineNr">405 </span> trace<span class="Constant"> 10</span>, <span class="Constant">[app]</span>, <span class="Constant">[render all]</span>
<span id="L406" class="LineNr">406 </span> <span class="Comment"># top menu</span>
<span id="L407" class="LineNr">407 </span> trace<span class="Constant"> 11</span>, <span class="Constant">[app]</span>, <span class="Constant">[render top menu]</span>
<span id="L408" class="LineNr">408 </span> width:num <span class="Special"><-</span> <a href='../081print.mu.html#L768'>screen-width</a> <a href='../081print.mu.html#L16'>screen</a>
<span id="L409" class="LineNr">409 </span> <a href='002-typing.mu.html#L1114'>draw-horizontal</a> <a href='../081print.mu.html#L16'>screen</a>,<span class="Constant"> 0</span>, <span class="Constant">0/left</span>, width, <span class="Constant">32/space</span>, <span class="Constant">0/black</span>, <span class="Constant">238/grey</span>
<span id="L410" class="LineNr">410 </span> button-start:num <span class="Special"><-</span> subtract width,<span class="Constant"> 20</span>
<span id="L411" class="LineNr">411 </span> button-on-screen?:bool <span class="Special"><-</span> greater-or-equal button-start,<span class="Constant"> 0</span>
<span id="L412" class="LineNr">412 </span> assert button-on-screen?, <span class="Constant">[screen too narrow for menu]</span>
<span id="L413" class="LineNr">413 </span> <a href='../081print.mu.html#L16'>screen</a> <span class="Special"><-</span> move-cursor <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">0/row</span>, button-start
<span id="L414" class="LineNr">414 </span> print <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[ run (F4) ]</span>, <span class="Constant">255/white</span>, <span class="Constant">161/reddish</span>
<span id="L415" class="LineNr">415 </span> <span class="Comment"># dotted line down the middle</span>
<span id="L416" class="LineNr">416 </span> trace<span class="Constant"> 11</span>, <span class="Constant">[app]</span>, <span class="Constant">[render divider]</span>
<span id="L417" class="LineNr">417 </span> divider:num, _ <span class="Special"><-</span> divide-with-remainder width,<span class="Constant"> 2</span>
<span id="L418" class="LineNr">418 </span> height:num <span class="Special"><-</span> <a href='../081print.mu.html#L782'>screen-height</a> <a href='../081print.mu.html#L16'>screen</a>
<span id="L419" class="LineNr">419 </span> <a href='004-programming-environment.mu.html#L502'>draw-vertical</a> <a href='../081print.mu.html#L16'>screen</a>, divider, <span class="Constant">1/top</span>, height, <span class="Constant">9482/vertical-dotted</span>
<span id="L420" class="LineNr">420 </span> <span class="Comment">#</span>
<span id="L421" class="LineNr">421 </span> <a href='../081print.mu.html#L16'>screen</a> <span class="Special"><-</span> <a href='004-programming-environment.mu.html#L431'>render-recipes</a> <a href='../081print.mu.html#L16'>screen</a>, env, render-editor
<span id="L422" class="LineNr">422 </span> <a href='../081print.mu.html#L16'>screen</a> <span class="Special"><-</span> render-sandbox-side <a href='../081print.mu.html#L16'>screen</a>, env, render-editor
<span id="L423" class="LineNr">423 </span> <span class="Constant"><a href='004-programming-environment.mu.html#L423'><end-render-components></a></span> <span class="Comment"># no early returns permitted</span>
<span id="L424" class="LineNr">424 </span> <span class="Comment">#</span>
<span id="L425" class="LineNr">425 </span> recipes:&:editor <span class="Special"><-</span> get *env, <span class="Constant">recipes:offset</span>
<span id="L426" class="LineNr">426 </span> current-sandbox:&:editor <span class="Special"><-</span> get *env, <span class="Constant">current-sandbox:offset</span>
<span id="L427" class="LineNr">427 </span> sandbox-in-focus?:bool <span class="Special"><-</span> get *env, <span class="Constant">sandbox-in-focus?:offset</span>
<span id="L428" class="LineNr">428 </span> <a href='../081print.mu.html#L16'>screen</a> <span class="Special"><-</span> <a href='004-programming-environment.mu.html#L468'>update-cursor</a> <a href='../081print.mu.html#L16'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
<span id="L429" class="LineNr">429 </span>]
<span id="L430" class="LineNr">430 </span>
<span id="L431" class="LineNr">431 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L431'>render-recipes</a> <a href='../081print.mu.html#L16'>screen</a>:&:<a href='../081print.mu.html#L16'>screen</a>, env:&:environment, render-editor:<a href='004-programming-environment.mu.html#L400'>render-recipe</a><span class="muRecipe"> -> </span><a href='../081print.mu.html#L16'>screen</a>:&:<a href='../081print.mu.html#L16'>screen</a>, env:&:environment [
<span id="L432" class="LineNr">432 </span> <span class="Constant">local-scope</span>
<span id="L433" class="LineNr">433 </span> <span class="Constant">load-inputs</span>
<span id="L434" class="LineNr">434 </span> trace<span class="Constant"> 11</span>, <span class="Constant">[app]</span>, <span class="Constant">[render recipes]</span>
<span id="L435" class="LineNr">435 </span> old-top-idx:num <span class="Special"><-</span> <a href='../081print.mu.html#L509'>save-top-idx</a> <a href='../081print.mu.html#L16'>screen</a>
<span id="L436" class="LineNr">436 </span> recipes:&:editor <span class="Special"><-</span> get *env, <span class="Constant">recipes:offset</span>
<span id="L437" class="LineNr">437 </span> <span class="Comment"># render recipes</span>
<span id="L438" class="LineNr">438 </span> left:num <span class="Special"><-</span> get *recipes, <span class="Constant">left:offset</span>
<span id="L439" class="LineNr">439 </span> right:num <span class="Special"><-</span> get *recipes, <span class="Constant">right:offset</span>
<span id="L440" class="LineNr">440 </span> row:num, column:num, <a href='../081print.mu.html#L16'>screen</a> <span class="Special"><-</span> call render-editor, <a href='../081print.mu.html#L16'>screen</a>, recipes
<span id="L441" class="LineNr">441 </span><span class="Constant"> <a href='004-programming-environment.mu.html#L441'><end-render-recipe-components></a></span>
<span id="L442" class="LineNr">442 </span> <span class="Comment"># draw dotted line after recipes</span>
<span id="L443" class="LineNr">443 </span> <a href='002-typing.mu.html#L1114'>draw-horizontal</a> <a href='../081print.mu.html#L16'>screen</a>, row, left, right, <span class="Constant">9480/horizontal-dotted</span>
<span id="L444" class="LineNr">444 </span> row <span class="Special"><-</span> add row,<span class="Constant"> 1</span>
<span id="L445" class="LineNr">445 </span> <a href='001-editor.mu.html#L211'>clear-screen-from</a> <a href='../081print.mu.html#L16'>screen</a>, row, left, left, right
<span id="L446" class="LineNr">446 </span> <span class="Comment">#</span>
<span id="L447" class="LineNr">447 </span> <a href='../081print.mu.html#L515'>assert-no-scroll</a> <a href='../081print.mu.html#L16'>screen</a>, old-top-idx
<span id="L448" class="LineNr">448 </span>]
<span id="L449" class="LineNr">449 </span>
<span id="L450" class="LineNr">450 </span><span class="Comment"># replaced in a later layer</span>
<span id="L451" class="LineNr">451 </span><span class="muRecipe">def</span> render-sandbox-side <a href='../081print.mu.html#L16'>screen</a>:&:<a href='../081print.mu.html#L16'>screen</a>, env:&:environment, render-editor:<a href='004-programming-environment.mu.html#L400'>render-recipe</a><span class="muRecipe"> -> </span><a href='../081print.mu.html#L16'>screen</a>:&:<a href='../081print.mu.html#L16'>screen</a>, env:&:environment [
<span id="L452" class="LineNr">452 </span> <span class="Constant">local-scope</span>
<span id="L453" class="LineNr">453 </span> <span class="Constant">load-inputs</span>
<span id="L454" class="LineNr">454 </span> trace<span class="Constant"> 11</span>, <span class="Constant">[app]</span>, <span class="Constant">[render sandboxes]</span>
<span id="L455" class="LineNr">455 </span> old-top-idx:num <span class="Special"><-</span> <a href='../081print.mu.html#L509'>save-top-idx</a> <a href='../081print.mu.html#L16'>screen</a>
<span id="L456" class="LineNr">456 </span> current-sandbox:&:editor <span class="Special"><-</span> get *env, <span class="Constant">current-sandbox:offset</span>
<span id="L457" class="LineNr">457 </span> left:num <span class="Special"><-</span> get *current-sandbox, <span class="Constant">left:offset</span>
<span id="L458" class="LineNr">458 </span> right:num <span class="Special"><-</span> get *current-sandbox, <span class="Constant">right:offset</span>
<span id="L459" class="LineNr">459 </span> row:num, column:num, <a href='../081print.mu.html#L16'>screen</a>, current-sandbox <span class="Special"><-</span> call render-editor, <a href='../081print.mu.html#L16'>screen</a>, current-sandbox
<span id="L460" class="LineNr">460 </span> <span class="Comment"># draw solid line after code (you'll see why in later layers)</span>
<span id="L461" class="LineNr">461 </span> <a href='002-typing.mu.html#L1114'>draw-horizontal</a> <a href='../081print.mu.html#L16'>screen</a>, row, left, right
<span id="L462" class="LineNr">462 </span> row <span class="Special"><-</span> add row,<span class="Constant"> 1</span>
<span id="L463" class="LineNr">463 </span> <a href='001-editor.mu.html#L211'>clear-screen-from</a> <a href='../081print.mu.html#L16'>screen</a>, row, left, left, right
<span id="L464" class="LineNr">464 </span> <span class="Comment">#</span>
<span id="L465" class="LineNr">465 </span> <a href='../081print.mu.html#L515'>assert-no-scroll</a> <a href='../081print.mu.html#L16'>screen</a>, old-top-idx
<span id="L466" class="LineNr">466 </span>]
<span id="L467" class="LineNr">467 </span>
<span id="L468" class="LineNr">468 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L468'>update-cursor</a> <a href='../081print.mu.html#L16'>screen</a>:&:<a href='../081print.mu.html#L16'>screen</a>, recipes:&:editor, current-sandbox:&:editor, sandbox-in-focus?:bool, env:&:environment<span class="muRecipe"> -> </span><a href='../081print.mu.html#L16'>screen</a>:&:<a href='../081print.mu.html#L16'>screen</a> [
<span id="L469" class="LineNr">469 </span> <span class="Constant">local-scope</span>
<span id="L470" class="LineNr">470 </span> <span class="Constant">load-inputs</span>
<span id="L471" class="LineNr">471 </span><span class="Constant"> <a href='004-programming-environment.mu.html#L471'><update-cursor-special-cases></a></span>
<span id="L472" class="LineNr">472 </span> <span class="Delimiter">{</span>
<span id="L473" class="LineNr">473 </span> <span class="muControl">break-if</span> sandbox-in-focus?
<span id="L474" class="LineNr">474 </span> cursor-row:num <span class="Special"><-</span> get *recipes, <span class="Constant">cursor-row:offset</span>
<span id="L475" class="LineNr">475 </span> cursor-column:num <span class="Special"><-</span> get *recipes, <span class="Constant">cursor-column:offset</span>
<span id="L476" class="LineNr">476 </span> <span class="Delimiter">}</span>
<span id="L477" class="LineNr">477 </span> <span class="Delimiter">{</span>
<span id="L478" class="LineNr">478 </span> <span class="muControl">break-unless</span> sandbox-in-focus?
<span id="L479" class="LineNr">479 </span> cursor-row:num <span class="Special"><-</span> get *current-sandbox, <span class="Constant">cursor-row:offset</span>
<span id="L480" class="LineNr">480 </span> cursor-column:num <span class="Special"><-</span> get *current-sandbox, <span class="Constant">cursor-column:offset</span>
<span id="L481" class="LineNr">481 </span> <span class="Delimiter">}</span>
<span id="L482" class="LineNr">482 </span> <a href='../081print.mu.html#L16'>screen</a> <span class="Special"><-</span> move-cursor <a href='../081print.mu.html#L16'>screen</a>, cursor-row, cursor-column
<span id="L483" class="LineNr">483 </span>]
<span id="L484" class="LineNr">484 </span>
<span id="L485" class="LineNr">485 </span><span class="Comment"># ctrl-n - switch focus</span>
<span id="L486" class="LineNr">486 </span><span class="Comment"># todo: test this</span>
<span id="L487" class="LineNr">487 </span>
<span id="L488" class="LineNr">488 </span><span class="muRecipe">after</span> <span class="Constant"><a href='004-programming-environment.mu.html#L67'><global-type></a></span> [
<span id="L489" class="LineNr">489 </span> <span class="Delimiter">{</span>
<span id="L490" class="LineNr">490 </span> switch-side?:bool <span class="Special"><-</span> equal c, <span class="Constant">14/ctrl-n</span>
<span id="L491" class="LineNr">491 </span> <span class="muControl">break-unless</span> switch-side?
<span id="L492" class="LineNr">492 </span> sandbox-in-focus?:bool <span class="Special"><-</span> get *env, <span class="Constant">sandbox-in-focus?:offset</span>
<span id="L493" class="LineNr">493 </span> sandbox-in-focus? <span class="Special"><-</span> not sandbox-in-focus?
<span id="L494" class="LineNr">494 </span> *env <span class="Special"><-</span> put *env, <span class="Constant">sandbox-in-focus?:offset</span>, sandbox-in-focus?
<span id="L495" class="LineNr">495 </span> <a href='../081print.mu.html#L16'>screen</a> <span class="Special"><-</span> <a href='004-programming-environment.mu.html#L468'>update-cursor</a> <a href='../081print.mu.html#L16'>screen</a>, recipes, current-sandbox, sandbox-in-focus?, env
<span id="L496" class="LineNr">496 </span> <span class="muControl"> loop</span> <span class="Constant">+next-event</span>
<span id="L497" class="LineNr">497 </span> <span class="Delimiter">}</span>
<span id="L498" class="LineNr">498 </span>]
<span id="L499" class="LineNr">499 </span>
<span id="L500" class="LineNr">500 </span><span class="SalientComment">## helpers</span>
<span id="L501" class="LineNr">501 </span>
<span id="L502" class="LineNr">502 </span><span class="muRecipe">def</span> <a href='004-programming-environment.mu.html#L502'>draw-vertical</a> <a href='../081print.mu.html#L16'>screen</a>:&:<a href='../081print.mu.html#L16'>screen</a>, col:num, y:num, bottom:num<span class="muRecipe"> -> </span><a href='../081print.mu.html#L16'>screen</a>:&:<a href='../081print.mu.html#L16'>screen</a> [
<span id="L503" class="LineNr">503 </span> <span class="Constant">local-scope</span>
<span id="L504" class="LineNr">504 </span> <span class="Constant">load-inputs</span>
<span id="L505" class="LineNr">505 </span> style:char, style-found?:bool <span class="Special"><-</span> <span class="Constant">next-input</span>
<span id="L506" class="LineNr">506 </span> <span class="Delimiter">{</span>
<span id="L507" class="LineNr">507 </span> <span class="muControl">break-if</span> style-found?
<span id="L508" class="LineNr">508 </span> style <span class="Special"><-</span> copy <span class="Constant">9474/vertical</span>
<span id="L509" class="LineNr">509 </span> <span class="Delimiter">}</span>
<span id="L510" class="LineNr">510 </span> color:num, color-found?:bool <span class="Special"><-</span> <span class="Constant">next-input</span>
<span id="L511" class="LineNr">511 </span> <span class="Delimiter">{</span>
<span id="L512" class="LineNr">512 </span> <span class="Comment"># default color to white</span>
<span id="L513" class="LineNr">513 </span> <span class="muControl">break-if</span> color-found?
<span id="L514" class="LineNr">514 </span> color <span class="Special"><-</span> copy <span class="Constant">245/grey</span>
<span id="L515" class="LineNr">515 </span> <span class="Delimiter">}</span>
<span id="L516" class="LineNr">516 </span> <span class="Delimiter">{</span>
<span id="L517" class="LineNr">517 </span> continue?:bool <span class="Special"><-</span> lesser-than y, bottom
<span id="L518" class="LineNr">518 </span> <span class="muControl">break-unless</span> continue?
<span id="L519" class="LineNr">519 </span> <a href='../081print.mu.html#L16'>screen</a> <span class="Special"><-</span> move-cursor <a href='../081print.mu.html#L16'>screen</a>, y, col
<span id="L520" class="LineNr">520 </span> print <a href='../081print.mu.html#L16'>screen</a>, style, color
<span id="L521" class="LineNr">521 </span> y <span class="Special"><-</span> add y,<span class="Constant"> 1</span>
<span id="L522" class="LineNr">522 </span> <span class="muControl"> loop</span>
<span id="L523" class="LineNr">523 </span> <span class="Delimiter">}</span>
<span id="L524" class="LineNr">524 </span>]
<span id="L525" class="LineNr">525 </span>
<span id="L526" class="LineNr">526 </span><span class="muScenario">scenario</span> backspace-over-text [
<span id="L527" class="LineNr">527 </span> <span class="Constant">local-scope</span>
<span id="L528" class="LineNr">528 </span> trace-until <span class="Constant">100/app</span> <span class="Comment"># trace too long</span>
<span id="L529" class="LineNr">529 </span> assume-screen <span class="Constant">50/width</span>, <span class="Constant">15/height</span>
<span id="L530" class="LineNr">530 </span> <span class="Comment"># recipes.mu is empty</span>
<span id="L531" class="LineNr">531 </span> assume-resources [
<span id="L532" class="LineNr">532 </span> ]
<span id="L533" class="LineNr">533 </span> <span class="Comment"># sandbox editor contains an instruction without storing outputs</span>
<span id="L534" class="LineNr">534 </span> env:&:environment <span class="Special"><-</span> <a href='004-programming-environment.mu.html#L21'>new-programming-environment</a> <a href='../088file.mu.html#L11'>resources</a>, <a href='../081print.mu.html#L16'>screen</a>, <span class="Constant">[]</span>
<span id="L535" class="LineNr">535 </span> <span class="Comment"># run the code in the editors</span>
<span id="L536" class="LineNr">536 </span> assume-console [
<span id="L537" class="LineNr">537 </span> type <span class="Constant">[a]</span>
<span id="L538" class="LineNr">538 </span> press backspace
<span id="L539" class="LineNr">539 </span> ]
<span id="L540" class="LineNr">540 </span> run [
<span id="L541" class="LineNr">541 </span> <a href='004-programming-environment.mu.html#L39'>event-loop</a> <a href='../081print.mu.html#L16'>screen</a>, <a href='../084console.mu.html#L23'>console</a>, env, <a href='../088file.mu.html#L11'>resources</a>
<span id="L542" class="LineNr">542 </span> 10:num/<span class="Special">raw</span> <span class="Special"><-</span> get *screen, <span class="Constant">cursor-row:offset</span>
<span id="L543" class="LineNr">543 </span> 11:num/<span class="Special">raw</span> <span class="Special"><-</span> get *screen, <span class="Constant">cursor-column:offset</span>
<span id="L544" class="LineNr">544 </span> ]
<span id="L545" class="LineNr">545 </span> memory-should-contain [
<span id="L546" class="LineNr">546 </span> <span class="Constant"> 10</span> <span class="Special"><-</span><span class="Constant"> 1</span>
<span id="L547" class="LineNr">547 </span> <span class="Constant"> 11</span> <span class="Special"><-</span><span class="Constant"> 0</span>
<span id="L548" class="LineNr">548 </span> ]
<span id="L549" class="LineNr">549 </span>]
</pre>
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