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<a href='https://github.com/akkartik/mu/blob/master/filesystem.mu'>https://github.com/akkartik/mu/blob/master/filesystem.mu</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment"># example program: copy one file into another, character by character</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment"># BEWARE: this will modify your file system</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment"># before running it, put some text into /tmp/mu-x</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment"># after running it, check /tmp/mu-y</span>
<span id="L5" class="LineNr"> 5 </span>
<span id="L6" class="LineNr"> 6 </span><span class="muRecipe">def</span> <a href='filesystem.mu.html#L6'>main</a> [
<span id="L7" class="LineNr"> 7 </span> <span class="Constant">local-scope</span>
<span id="L8" class="LineNr"> 8 </span> source-file:&:<a href='075channel.mu.html#L36'>source</a>:char <span class="Special"><-</span> <a href='088file.mu.html#L21'>start-reading</a><span class="Constant"> null/real-filesystem,</span> <span class="Constant">[/tmp/mu-x]</span>
<span id="L9" class="LineNr"> 9 </span> sink-file:&:<a href='075channel.mu.html#L40'>sink</a>:char, write-routine:num <span class="Special"><-</span> <a href='088file.mu.html#L105'>start-writing</a><span class="Constant"> null/real-filesystem,</span> <span class="Constant">[/tmp/mu-y]</span>
<span id="L10" class="LineNr">10 </span> <span class="Delimiter">{</span>
<span id="L11" class="LineNr">11 </span> c:char, done?:bool, source-file <span class="Special"><-</span> read source-file
<span id="L12" class="LineNr">12 </span> <span class="muControl">break-if</span> done?
<span id="L13" class="LineNr">13 </span> sink-file <span class="Special"><-</span> <a href='075channel.mu.html#L60'>write</a> sink-file, c
<span id="L14" class="LineNr">14 </span> <span class="muControl"> loop</span>
<span id="L15" class="LineNr">15 </span> <span class="Delimiter">}</span>
<span id="L16" class="LineNr">16 </span> close sink-file
<span id="L17" class="LineNr">17 </span> <span class="Comment"># make sure to wait for the file to be actually written to disk</span>
<span id="L18" class="LineNr">18 </span> <span class="Comment"># (Mu practices structured concurrency: <a href="http://250bpm.com/blog:71">http://250bpm.com/blog:71</a>)</span>
<span id="L19" class="LineNr">19 </span> wait-for-routine write-routine
<span id="L20" class="LineNr">20 </span>]
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