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<?xml version="1.0" encoding="utf-8"?>
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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>Utilisation de git pour calculer les mtimes</title>
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<div class="return"><a href="#entete">↓ Menu ↓</a></div>
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<a href="/Scratch/en/blog/2010-09-02-Use-git-to-calculate-trusted-mtimes/" onclick="setLanguage('en')">in English</a>
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<div id="titre">
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<h1>
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Utilisation de git pour calculer les mtimes
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</h1>
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<div class="corps">
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<p>Vous pouvez remarquer qu’à la fin de chaque page je donne une date de dernière modification.
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Précédemment cette date était calculée en utilisant la date du fichier.
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Mais il arrive fréquemment que je fasse un <code>touch</code> d’un fichier pour engendrer tout le site de nouveau.
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Donc la date n’est pas nécessairement la <em>vraie</em> de modification du contenue.</p>
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<p>J’utilise <a href="http://git-scm.org">git</a> pour <em>versionner</em> mon site web.
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Et cet outil me permet de récupérer la dernière date de <em>vraie</em> modification d’un fichier.
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Voici comment je m’y prend avec <a href="http://nanoc.stoneship.org">nanoc</a> :</p>
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<div class="code"><div class="file"><a href="/Scratch/fr/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>Bien entendu je sais que c’est très lent et absolument pas optimisé.
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Mais ça fonctionne comme prévu.
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Maintenant la date que vous voyez en bas de la page correspond exactement à la dernière date de modification de son contenu.</p>
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<p><em>Mise à jour</em>:
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Je tiens à remercier Eric Sunshine et Kris pour leurs conseils sur ce problème.</p>
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<a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/deed.fr">Droits de reproduction ©, Yann Esposito</a>
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<div id="lastmod">
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Écrit le : 02/09/2010
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modifié le : 14/09/2011
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Site entièrement réalisé avec
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<a href="http://www.vim.org">Vim</a>
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et
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<a href="http://nanoc.stoneship.org">nanoc</a>
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