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.Comment { color: #9090ff; }
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<pre id='vimCodeElement'>
<span class="Comment"># Wrappers around interaction primitives that take a potentially fake object</span>
<span class="Comment"># and are thus easier to test.</span>

<span class="muData">exclusive-container</span> event [
  text:character
  keycode:number  <span class="Comment"># keys on keyboard without a unicode representation</span>
  touch:touch-event  <span class="Comment"># mouse, track ball, etc.</span>
  resize:resize-event
  <span class="Comment"># update the assume-console handler if you add more variants</span>
]

<span class="muData">container</span> touch-event [
  type:number
  row:number
  column:number
]

<span class="muData">container</span> resize-event [
  width:number
  height:number
]

<span class="muData">container</span> console [
  index:number
  data:address:array:event
]

<span class="muRecipe">recipe</span> new-fake-console [
  <span class="Constant">local-scope</span>
  result:address:console<span class="Special"> &lt;- </span>new <span class="Constant">console:type</span>
  buf:address:address:array:character<span class="Special"> &lt;- </span>get-address *result, <span class="Constant">data:offset</span>
  *buf<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
  idx:address:number<span class="Special"> &lt;- </span>get-address *result, <span class="Constant">index:offset</span>
  *idx<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="muControl">reply</span> result
]

<span class="muRecipe">recipe</span> read-event [
  <span class="Constant">local-scope</span>
  x:address:console<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
  <span class="Delimiter">{</span>
    <span class="muControl">break-unless</span> x
    idx:address:number<span class="Special"> &lt;- </span>get-address *x, <span class="Constant">index:offset</span>
    buf:address:array:event<span class="Special"> &lt;- </span>get *x, <span class="Constant">data:offset</span>
    <span class="Delimiter">{</span>
      max:number<span class="Special"> &lt;- </span>length *buf
      done?:boolean<span class="Special"> &lt;- </span>greater-or-equal *idx, max
      <span class="muControl">break-unless</span> done?
      dummy:address:event<span class="Special"> &lt;- </span>new <span class="Constant">event:type</span>
      <span class="muControl">reply</span> *dummy, x/same-as-ingredient:<span class="Constant">0</span>, <span class="Constant">1/found</span>, <span class="Constant">1/quit</span>
    <span class="Delimiter">}</span>
    result:event<span class="Special"> &lt;- </span>index *buf, *idx
    *idx<span class="Special"> &lt;- </span>add *idx, <span class="Constant">1</span>
    <span class="muControl">reply</span> result, x/same-as-ingredient:<span class="Constant">0</span>, <span class="Constant">1/found</span>, <span class="Constant">0/quit</span>
  <span class="Delimiter">}</span>
  switch  <span class="Comment"># real event source is infrequent; avoid polling it too much</span>
  result:event, found?:boolean<span class="Special"> &lt;- </span>check-for-interaction
  <span class="muControl">reply</span> result, x/same-as-ingredient:<span class="Constant">0</span>, found?, <span class="Constant">0/quit</span>
]

<span class="Comment"># variant of read-event for just keyboard events. Discards everything that</span>
<span class="Comment"># isn't unicode, so no arrow keys, page-up/page-down, etc. But you still get</span>
<span class="Comment"># newlines, tabs, ctrl-d..</span>
<span class="muRecipe">recipe</span> read-key [
  <span class="Constant">local-scope</span>
  console:address<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
  x:event, console, found?:boolean, quit?:boolean<span class="Special"> &lt;- </span>read-event console
  <span class="muControl">reply-if</span> quit?, <span class="Constant">0</span>, console/same-as-ingredient:<span class="Constant">0</span>, found?, quit?
  <span class="muControl">reply-unless</span> found?, <span class="Constant">0</span>, console/same-as-ingredient:<span class="Constant">0</span>, found?, quit?
  c:address:character<span class="Special"> &lt;- </span>maybe-convert x, <span class="Constant">text:variant</span>
  <span class="muControl">reply-unless</span> c, <span class="Constant">0</span>, console/same-as-ingredient:<span class="Constant">0</span>, <span class="Constant">0/found</span>, <span class="Constant">0/quit</span>
  <span class="muControl">reply</span> *c, console/same-as-ingredient:<span class="Constant">0</span>, <span class="Constant">1/found</span>, <span class="Constant">0/quit</span>
]

<span class="muRecipe">recipe</span> send-keys-to-channel [
  <span class="Constant">local-scope</span>
  console:address<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
  chan:address:channel<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
  screen:address<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
  <span class="Delimiter">{</span>
    c:character, console, found?:boolean, quit?:boolean<span class="Special"> &lt;- </span>read-key console
    <span class="muControl">loop-unless</span> found?
    <span class="muControl">break-if</span> quit?
    assert c, <span class="Constant">[invalid event, expected text]</span>
    screen<span class="Special"> &lt;- </span>print-character screen, c
    chan<span class="Special"> &lt;- </span>write chan, c
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
  <span class="muControl">reply</span> console/same-as-ingredient:<span class="Constant">0</span>, chan/same-as-ingredient:<span class="Constant">1</span>, screen/same-as-ingredient:<span class="Constant">2</span>
]

<span class="muRecipe">recipe</span> wait-for-event [
  <span class="Constant">local-scope</span>
  console:address<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
  <span class="Delimiter">{</span>
    _, console, found?:boolean<span class="Special"> &lt;- </span>read-event console
    <span class="muControl">loop-unless</span> found?
  <span class="Delimiter">}</span>
  <span class="muControl">reply</span> console/same-as-ingredient:<span class="Constant">0</span>
]

<span class="Comment"># use this helper to skip rendering if there's lots of other events queued up</span>
<span class="muRecipe">recipe</span> has-more-events? [
  <span class="Constant">local-scope</span>
  console:address<span class="Special"> &lt;- </span><span class="Constant">next-ingredient</span>
  <span class="Delimiter">{</span>
    <span class="muControl">break-unless</span> console
    <span class="Comment"># fake consoles should be plenty fast; never skip</span>
    <span class="muControl">reply</span> <span class="Constant">0/false</span>
  <span class="Delimiter">}</span>
  result:boolean<span class="Special"> &lt;- </span>interactions-left?
  <span class="muControl">reply</span> result
]
</pre>
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