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<pre id='vimCodeElement'>
<span class="Comment"># Wrappers around file system primitives that take a 'filesystem' object and</span>
<span class="Comment"># are thus easier to test.</span>

<span class="muData">container</span> filesystem [
  data:&amp;:@:file-mapping
]

<span class="muData">container</span> file-mapping [
  name:text
  contents:text
]

<span class="muRecipe">def</span> start-reading fs:&amp;:filesystem, filename:text<span class="muRecipe"> -&gt; </span>contents:&amp;:source:char [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  <span class="Delimiter">{</span>
    <span class="muControl">break-if</span> fs
    <span class="Comment"># real file system</span>
    file:num<span class="Special"> &lt;- </span>$open-file-for-reading filename
    assert file, <span class="Constant">[file not found]</span>
    contents:&amp;:source:char, sink:&amp;:sink:char<span class="Special"> &lt;- </span>new-channel <span class="Constant">30</span>
    start-running transmit-from-file file, sink
    <span class="muControl">return</span>
  <span class="Delimiter">}</span>
  <span class="Comment"># fake file system</span>
  i:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  data:&amp;:@:file-mapping<span class="Special"> &lt;- </span>get *fs, <span class="Constant">data:offset</span>
  len:num<span class="Special"> &lt;- </span>length *data
  <span class="Delimiter">{</span>
    done?:bool<span class="Special"> &lt;- </span>greater-or-equal i, len
    <span class="muControl">break-if</span> done?
    tmp:file-mapping<span class="Special"> &lt;- </span>index *data, i
    i<span class="Special"> &lt;- </span>add i, <span class="Constant">1</span>
    curr-filename:text<span class="Special"> &lt;- </span>get tmp, <span class="Constant">name:offset</span>
    found?:bool<span class="Special"> &lt;- </span>equal filename, curr-filename
    <span class="muControl">loop-unless</span> found?
    contents:&amp;:source:char, sink:&amp;:sink:char<span class="Special"> &lt;- </span>new-channel <span class="Constant">30</span>
    curr-contents:text<span class="Special"> &lt;- </span>get tmp, <span class="Constant">contents:offset</span>
    start-running transmit-from-text curr-contents, sink
    <span class="muControl">return</span>
  <span class="Delimiter">}</span>
  <span class="muControl">return</span> <span class="Constant">0/not-found</span>
]

<span class="muRecipe">def</span> transmit-from-file file:num, sink:&amp;:sink:char<span class="muRecipe"> -&gt; </span>sink:&amp;:sink:char [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  <span class="Delimiter">{</span>
    c:char, eof?:bool<span class="Special"> &lt;- </span>$read-from-file file
    <span class="muControl">break-if</span> eof?
    sink<span class="Special"> &lt;- </span>write sink, c
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
  sink<span class="Special"> &lt;- </span>close sink
  file<span class="Special"> &lt;- </span>$close-file file
]

<span class="muRecipe">def</span> transmit-from-text contents:text, sink:&amp;:sink:char<span class="muRecipe"> -&gt; </span>sink:&amp;:sink:char [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  i:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  len:num<span class="Special"> &lt;- </span>length *contents
  <span class="Delimiter">{</span>
    done?:bool<span class="Special"> &lt;- </span>greater-or-equal i, len
    <span class="muControl">break-if</span> done?
    c:char<span class="Special"> &lt;- </span>index *contents, i
    sink<span class="Special"> &lt;- </span>write sink, c
    i<span class="Special"> &lt;- </span>add i, <span class="Constant">1</span>
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
  sink<span class="Special"> &lt;- </span>close sink
]

<span class="muRecipe">def</span> start-writing fs:&amp;:filesystem, filename:text<span class="muRecipe"> -&gt; </span>sink:&amp;:sink:char, routine-id:num [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  source:&amp;:source:char, sink:&amp;:sink:char<span class="Special"> &lt;- </span>new-channel <span class="Constant">30</span>
  <span class="Delimiter">{</span>
    <span class="muControl">break-if</span> fs
    <span class="Comment"># real file system</span>
    file:num<span class="Special"> &lt;- </span>$open-file-for-writing filename
    assert file, <span class="Constant">[no such file]</span>
    routine-id<span class="Special"> &lt;- </span>start-running transmit-to-file file, source
    <span class="muControl">reply</span>
  <span class="Delimiter">}</span>
  <span class="Comment"># fake file system</span>
  <span class="Comment"># beware: doesn't support multiple concurrent writes yet</span>
  routine-id<span class="Special"> &lt;- </span>start-running transmit-to-fake-file fs, filename, source
]

<span class="muRecipe">def</span> transmit-to-file file:num, source:&amp;:source:char<span class="muRecipe"> -&gt; </span>source:&amp;:source:char [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  <span class="Delimiter">{</span>
    c:char, done?:bool, source<span class="Special"> &lt;- </span>read source
    <span class="muControl">break-if</span> done?
    $write-to-file file, c
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
  file<span class="Special"> &lt;- </span>$close-file file
]

<span class="muRecipe">def</span> transmit-to-fake-file fs:&amp;:filesystem, filename:text, source:&amp;:source:char<span class="muRecipe"> -&gt; </span>fs:&amp;:filesystem, source:&amp;:source:char [
  <span class="Constant">local-scope</span>
  <span class="Constant">load-ingredients</span>
  <span class="Comment"># compute new file contents</span>
  buf:&amp;:buffer<span class="Special"> &lt;- </span>new-buffer <span class="Constant">30</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:text<span class="Special"> &lt;- </span>buffer-to-array buf
  new-file-mapping:file-mapping<span class="Special"> &lt;- </span>merge filename, contents
  <span class="Comment"># write to filesystem</span>
  curr-filename:text<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  data:&amp;:@:file-mapping<span class="Special"> &lt;- </span>get *fs, <span class="Constant">data:offset</span>
  <span class="Comment"># replace file contents if it already exists</span>
  i:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  len:num<span class="Special"> &lt;- </span>length *data
  <span class="Delimiter">{</span>
    done?:bool<span class="Special"> &lt;- </span>greater-or-equal i, len
    <span class="muControl">break-if</span> done?
    tmp:file-mapping<span class="Special"> &lt;- </span>index *data, i
    curr-filename<span class="Special"> &lt;- </span>get tmp, <span class="Constant">name:offset</span>
    found?:bool<span class="Special"> &lt;- </span>equal filename, curr-filename
    <span class="muControl">loop-unless</span> found?
    put-index *data, i, new-file-mapping
    <span class="muControl">reply</span>
  <span class="Delimiter">}</span>
  <span class="Comment"># if file didn't already exist, make room for it</span>
  new-len:num<span class="Special"> &lt;- </span>add len, <span class="Constant">1</span>
  new-data:&amp;:@:file-mapping<span class="Special"> &lt;- </span>new <span class="Constant">file-mapping:type</span>, new-len
  put *fs, <span class="Constant">data:offset</span>, new-data
  <span class="Comment"># copy over old files</span>
  i:num<span class="Special"> &lt;- </span>copy <span class="Constant">0</span>
  <span class="Delimiter">{</span>
    done?:bool<span class="Special"> &lt;- </span>greater-or-equal i, len
    <span class="muControl">break-if</span> done?
    tmp:file-mapping<span class="Special"> &lt;- </span>index *data, i
    put-index *new-data, i, tmp
  <span class="Delimiter">}</span>
  <span class="Comment"># write new file</span>
  put-index *new-data, len, new-file-mapping
]
</pre>
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