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<title>Mu - filesystem.mu</title>
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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:&:source:char <span class="Special"><-</span> start-reading <span class="Constant">0/real-filesystem</span>, <span class="Constant">[/tmp/mu-x]</span>
sink-file:&:sink:char, write-routine:num <span class="Special"><-</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"><-</span> read source-file
<span class="muControl">break-if</span> done?
sink-file <span class="Special"><-</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
]
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