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<pre id='vimCodeElement'>
<span class="Comment"># Check our support for fake file systems in scenarios.</span>

<span class="muScenario">scenario</span> read-from-fake-file [
  <span class="Constant">local-scope</span>
  assume-resources [
    <span class="Constant">[a]</span> <span class="Special">&lt;-</span> [
<span class="Constant">      |xyz|</span>
    ]
  ]
  contents:&amp;:source:char <span class="Special">&lt;-</span> start-reading resources, <span class="Constant">[a]</span>
  1:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> read contents
  2:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> read contents
  3:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> read contents
  4:char/<span class="Special">raw</span> <span class="Special">&lt;-</span> read contents
  _, 5:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> read contents
  memory-should-contain [
   <span class="Constant"> 1</span> <span class="Special">&lt;-</span><span class="Constant"> 120</span>  <span class="Comment"># x</span>
   <span class="Constant"> 2</span> <span class="Special">&lt;-</span><span class="Constant"> 121</span>  <span class="Comment"># y</span>
   <span class="Constant"> 3</span> <span class="Special">&lt;-</span><span class="Constant"> 122</span>  <span class="Comment"># z</span>
   <span class="Constant"> 4</span> <span class="Special">&lt;-</span><span class="Constant"> 10</span>  <span class="Comment"># newline</span>
   <span class="Constant"> 5</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># eof</span>
  ]
]

<span class="muScenario">scenario</span> write-to-fake-file [
  <span class="Constant">local-scope</span>
  assume-resources [
  ]
  sink:&amp;:sink:char, writer:num/routine <span class="Special">&lt;-</span> start-writing resources, <span class="Constant">[a]</span>
  sink <span class="Special">&lt;-</span> write sink, <span class="Constant">120/x</span>
  sink <span class="Special">&lt;-</span> write sink, <span class="Constant">121/y</span>
  close sink
  wait-for-routine writer
  contents-read-back:text <span class="Special">&lt;-</span> slurp resources, <span class="Constant">[a]</span>
  10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal contents-read-back, <span class="Constant">[xy]</span>
  memory-should-contain [
   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># file contents read back exactly match what was written</span>
  ]
]

<span class="muScenario">scenario</span> write-to-fake-file-that-exists [
  <span class="Constant">local-scope</span>
  assume-resources [
    <span class="Constant">[a]</span> <span class="Special">&lt;-</span> <span class="Constant">[]</span>
  ]
  sink:&amp;:sink:char, writer:num/routine <span class="Special">&lt;-</span> start-writing resources, <span class="Constant">[a]</span>
  sink <span class="Special">&lt;-</span> write sink, <span class="Constant">120/x</span>
  sink <span class="Special">&lt;-</span> write sink, <span class="Constant">121/y</span>
  close sink
  wait-for-routine writer
  contents-read-back:text <span class="Special">&lt;-</span> slurp resources, <span class="Constant">[a]</span>
  10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal contents-read-back, <span class="Constant">[xy]</span>
  memory-should-contain [
   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># file contents read back exactly match what was written</span>
  ]
]

<span class="muScenario">scenario</span> write-to-existing-file-preserves-other-files [
  <span class="Constant">local-scope</span>
  assume-resources [
    <span class="Constant">[a]</span> <span class="Special">&lt;-</span> <span class="Constant">[]</span>
    <span class="Constant">[b]</span> <span class="Special">&lt;-</span> [
<span class="Constant">      |bcd|</span>
    ]
  ]
  sink:&amp;:sink:char, writer:num/routine <span class="Special">&lt;-</span> start-writing resources, <span class="Constant">[a]</span>
  sink <span class="Special">&lt;-</span> write sink, <span class="Constant">120/x</span>
  sink <span class="Special">&lt;-</span> write sink, <span class="Constant">121/y</span>
  close sink
  wait-for-routine writer
  contents-read-back:text <span class="Special">&lt;-</span> slurp resources, <span class="Constant">[a]</span>
  10:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal contents-read-back, <span class="Constant">[xy]</span>
  other-file-contents:text <span class="Special">&lt;-</span> slurp resources, <span class="Constant">[b]</span>
  11:bool/<span class="Special">raw</span> <span class="Special">&lt;-</span> equal other-file-contents, <span class="Constant">[bcd</span>
<span class="Constant">]</span>
  memory-should-contain [
   <span class="Constant"> 10</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># file contents read back exactly match what was written</span>
   <span class="Constant"> 11</span> <span class="Special">&lt;-</span><span class="Constant"> 1</span>  <span class="Comment"># other files also continue to persist unchanged</span>
  ]
]

<span class="muRecipe">def</span> slurp resources:&amp;:resources, filename:text<span class="muRecipe"> -&gt; </span>contents:text [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  source:&amp;:source:char <span class="Special">&lt;-</span> start-reading resources, filename
  buf:&amp;:buffer <span class="Special">&lt;-</span> new-buffer <span class="Constant">30/capacity</span>
  <span class="Delimiter">{</span>
    c:char, done?:bool, source <span class="Special">&lt;-</span> read source
    <span class="muControl">break-if</span> done?
    buf <span class="Special">&lt;-</span> append buf, c
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
  contents <span class="Special">&lt;-</span> buffer-to-array buf
]
</pre>
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