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<h1>Use git to calculate trusted mtimes</h1>
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<p>You can remark at the bottom of each page I provide a last modification date. This label was first calculated using the <code>mtime</code> of the file on the file system. But many times I modify this date just to force some recompilation. Therefore the date wasn’t a date of <em>real</em> modification.</p>
<p>I use <a href="http://git-scm.org">git</a> to version my website. And fortunately I can know the last date of <em>real</em> change of a file. This is how I do this with <a href="http://nanoc.stoneship.org">nanoc</a>:</p>
<div class="sourceCode" id="cb1"><pre class="sourceCode ruby"><code class="sourceCode ruby"><a class="sourceLine" id="cb1-1" title="1"><span class="kw">def</span> gitmtime</a>
<a class="sourceLine" id="cb1-2" title="2"> filepath=<span class="ot">@item</span>.path.sub(<span class="st">'/Scratch/'</span>,<span class="st">'content/html/'</span>).sub(<span class="ot">/\/$/</span>,<span class="st">''</span>)</a>
<a class="sourceLine" id="cb1-3" title="3"> ext=<span class="ot">%{</span><span class="st">.</span><span class="ot">#{@item</span>[<span class="st">:extension</span>]<span class="ot">}}</span></a>
<a class="sourceLine" id="cb1-4" title="4"> filepath&lt;&lt;=ext</a>
<a class="sourceLine" id="cb1-5" title="5"> <span class="kw">if</span> <span class="kw">not</span> <span class="dt">FileTest</span>.exists?(filepath)</a>
<a class="sourceLine" id="cb1-6" title="6"> filepath.sub!(ext,<span class="ot">%{#{@item</span>.raw_filename<span class="ot">}#{</span>ext<span class="ot">}}</span>)</a>
<a class="sourceLine" id="cb1-7" title="7"> <span class="kw">end</span></a>
<a class="sourceLine" id="cb1-8" title="8"> str=<span class="st">`git log -1 --format='%ci' -- </span><span class="ot">#{</span>filepath<span class="ot">}</span><span class="st">`</span></a>
<a class="sourceLine" id="cb1-9" title="9"> <span class="kw">if</span> str.nil? <span class="kw">or</span> str.empty?</a>
<a class="sourceLine" id="cb1-10" title="10"> <span class="kw">return</span> <span class="dt">Time</span>.now</a>
<a class="sourceLine" id="cb1-11" title="11"> <span class="kw">else</span></a>
<a class="sourceLine" id="cb1-12" title="12"> <span class="kw">return</span> <span class="dt">DateTime</span>.parse( str )</a>
<a class="sourceLine" id="cb1-13" title="13"> <span class="kw">end</span></a>
<a class="sourceLine" id="cb1-14" title="14"><span class="kw">end</span></a></code></pre></div>
<p>Of course I know it is really slow and absolutely not optimized. But it works as expected. Now the date you see at the bottom is exactly the date I modified the <em>content</em> of the page.</p>
<p><em>Edit</em>: Thanks to Eric Sunshine and Kris to provide me some hints at cleaning my code.</p>
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Published on 2010-09-02
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