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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Mu - filesystem.mu</title>
<meta name="Generator" content="Vim/7.4">
<meta name="plugin-version" content="vim7.4_v2">
<meta name="syntax" content="none">
<meta name="settings" content="use_css,pre_wrap,no_foldcolumn,expand_tabs,prevent_copy=">
<meta name="colorscheme" content="minimal">
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* { font-size: 12pt; font-size: 1em; }
.Delimiter { color: #800080; }
.muControl { color: #c0a020; }
.Comment { color: #9090ff; }
.Constant { color: #00a0a0; }
.Special { color: #c00000; }
.muRecipe { color: #ff8700; }
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<pre id='vimCodeElement'>
<span class="Comment"># example program: copy one file into another, character by character</span>
<span class="Comment"># BEWARE: this will modify your file system</span>
<span class="Comment"># before running it, put some text into /tmp/mu-x</span>
<span class="Comment"># after running it, check /tmp/mu-y</span>

<span class="muRecipe">def</span> main [
  <span class="Constant">local-scope</span>
  source-file:&amp;:source:char <span class="Special">&lt;-</span> start-reading <span class="Constant">0/real-filesystem</span>, <span class="Constant">[/tmp/mu-x]</span>
  sink-file:&amp;:sink:char, write-routine:num <span class="Special">&lt;-</span> start-writing <span class="Constant">0/real-filesystem</span>, <span class="Constant">[/tmp/mu-y]</span>
  <span class="Delimiter">{</span>
    c:char, done?:bool, source-file <span class="Special">&lt;-</span> read source-file
    <span class="muControl">break-if</span> done?
    sink-file <span class="Special">&lt;-</span> write sink-file, c
    <span class="muControl">loop</span>
  <span class="Delimiter">}</span>
  close sink-file
  <span class="Comment"># make sure to wait for the file to be actually written to disk</span>
  <span class="Comment"># (Mu practices structured concurrency: <a href="http://250bpm.com/blog:71)">http://250bpm.com/blog:71)</a></span>
  wait-for-routine write-routine
]
</pre>
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