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<link rel="alternate" lang="fr" xml:lang="fr" title="Utilisation de git pour calculer les mtimes" type="text/html" hreflang="fr" href="/Scratch/fr/blog/2010-09-02-Use-git-to-calculate-trusted-mtimes/" />
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<link rel="alternate" lang="en" xml:lang="en" title="Use git to calculate trusted mtimes" type="text/html" hreflang="en" href="/Scratch/en/blog/2010-09-02-Use-git-to-calculate-trusted-mtimes/" />
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<title>Use git to calculate trusted mtimes</title>
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<h1>
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Use git to calculate trusted mtimes
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</h1>
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<div class="corps">
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<p>You can remark at the bottom of each page I provide a last modification date.
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This label was first calculated using the <code>mtime</code> of the file on the file system.
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But many times I modify this date just to force some recompilation.
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Therefore the date wasn’t a date of <em>real</em> modification.</p>
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<p>I use <a href="http://git-scm.org">git</a> to version my website.
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And fortunately I can know the last date of <em>real</em> change of a file.
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This is how I do this with <a href="http://nanoc.stoneship.org">nanoc</a>:</p>
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<div class="code"><div class="file"><a href="/Scratch/en/blog/2010-09-02-Use-git-to-calculate-trusted-mtimes/code/gitmtime.rb"> ➥ gitmtime.rb </a></div><div class="withfile">
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<pre class="twilight">
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<span class="Keyword">def</span> <span class="Entity">gitmtime</span>
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filepath<span class="Keyword">=</span><span class="Variable"><span class="Variable">@</span>item</span>.<span class="Entity">path</span>.<span class="Entity">sub</span>(<span class="String"><span class="String">'</span>/Scratch/<span class="String">'</span></span>,<span class="String"><span class="String">'</span>content/html/<span class="String">'</span></span>).<span class="Entity">sub</span>(<span class="StringRegexp"><span class="StringRegexp">/</span></span><span class="StringRegexp"><span class="StringRegexpSpecial">\/</span>$</span><span class="StringRegexp"><span class="StringRegexp">/</span></span>,<span class="String"><span class="String">'</span><span class="String">'</span></span>)
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ext<span class="Keyword">=</span><span class="String"><span class="String">%{</span>.<span class="StringEmbeddedSource"><span class="StringEmbeddedSource">#{</span><span class="StringVariable"><span class="StringVariable">@</span>item</span><span class="StringEmbeddedSource">[</span><span class="StringConstant"><span class="StringConstant">:</span>extension</span><span class="StringEmbeddedSource">]</span><span class="StringEmbeddedSource">}</span></span><span class="String">}</span></span>
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filepath<span class="Keyword"><<=</span>ext
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<span class="Keyword">if</span> <span class="Keyword">not</span> <span class="Support">FileTest</span>.<span class="Entity">exists?</span>(filepath)
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filepath.<span class="Entity">sub!</span>(ext,<span class="String"><span class="String">%{</span><span class="StringEmbeddedSource"><span class="StringEmbeddedSource">#{</span><span class="StringVariable"><span class="StringVariable">@</span>item</span><span class="StringEmbeddedSource"><span class="StringEmbeddedSource">.</span><span class="Entity">raw_filename</span></span><span class="StringEmbeddedSource">}</span></span><span class="StringEmbeddedSource"><span class="StringEmbeddedSource">#{</span>ext<span class="StringEmbeddedSource">}</span></span><span class="String">}</span></span>)
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<span class="Keyword">end</span>
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str<span class="Keyword">=</span><span class="String"><span class="String">`</span>git log -1 --format='%ci' -- <span class="StringEmbeddedSource"><span class="StringEmbeddedSource">#{</span>filepath<span class="StringEmbeddedSource">}</span></span><span class="String">`</span></span>
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<span class="Keyword">if</span> str.<span class="Entity">nil?</span> <span class="Keyword">or</span> str.<span class="Entity">empty?</span>
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<span class="Keyword">return</span> <span class="Support">Time</span>.<span class="Entity">now</span>
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<span class="Keyword">else</span>
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<span class="Keyword">return</span> <span class="Support">DateTime</span>.<span class="Entity">parse</span>( str )
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<span class="Keyword">end</span>
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<span class="Keyword">end</span>
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</pre>
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</div></div>
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<p>Of course I know it is really slow and absolutely not optimized.
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But it works as expected.
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Now the date you see at the bottom is exactly the date I modified the <em>content</em> of the page.</p>
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<p><em>Edit</em>:
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Thanks to Eric Sunshine and Kris to provide me some hints at cleaning my code.</p>
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<a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/">Copyright ©, Yann Esposito</a>
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<div id="lastmod">
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Created: 09/02/2010
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Modified: 09/14/2011
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</div>
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<div>
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Entirely done with
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<a href="http://www.vim.org">Vim</a>
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and
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<a href="http://nanoc.stoneship.org">nanoc</a>
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