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134 lines
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<title>YBlog - Installer Haskell</title>
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<a href="../../../../Scratch/en/blog/Safer-Haskell-Install/">Anglais</a>
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<div id="titre">
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<h1>Installer Haskell</h1>
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<div id="afterheader" class="article">
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<div class="corps">
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<div>
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<img src="../../../../Scratch/img/blog/Safer-Haskell-Install/main.jpg" alt="to Haskell and Beyond!!!" />
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<div class="intro">
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<p><span class="sc"><abbr title="Trop long; pas lu">tlpl</abbr>: </span> Pour installer Haskell (OS X et Linux) copiez/collez les lignes suivante dans un terminal :</p>
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<pre><code>curl https://raw.githubusercontent.com/yogsototh/install-haskell/master/install-haskell.sh | sudo zsh</code></pre>
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<p>Si vous êtes sous windows, téléchargez Haskell Platform et suivez les instructions pour utiliser <a href="http://www.stackage.org/lts">Haskell LTS</a>.</p>
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<p>Si vous voulez savoir le pourquoi et le comment ; lisez le reste de l’article.</p>
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</div>
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<h2 id="pourquoi">Pourquoi ?</h2>
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<p>La plus grande faiblesse d’Haskell n’a rien à voir avec le langage en lui-même mais avec son écosystème.</p>
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<p>The main problem I’ll try to address is the one known as <em>cabal hell</em>. The community is really active in fixing the issue. I am very confident that in less than a year this problem will be one of the past. But to work today, I provide an install method that should reduce greatly two effects of cabal hell:</p>
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<ul>
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<li>dependency error</li>
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<li>lost time in compilation (poor polar bears)</li>
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</ul>
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<p>With my actual installation method, you should minimize your headache and almost never hit a dependency error. But there could exists some. If you encounter any dependency error, ask gently to the package manager to port its package to <a href="http://www.stackage.org">stackage</a>.</p>
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<p>So to install copy/paste the following three lines in your terminal:</p>
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<pre><code>curl https://raw.githubusercontent.com/yogsototh/install-haskell/master/install-haskell.sh | sudo zsh</code></pre>
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<h2 id="how">How?</h2>
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<p>You can read the script and you will see that this is quite straightforward.</p>
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<ol type="1">
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<li>It downloads the latest <code>GHC</code> binary for you system and install it.</li>
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<li>It does the same with the <code>cabal</code> program.</li>
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<li>It updates your cabal config file to use <a href="http://www.stackage.org/lts">Haskell LTS</a>.</li>
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<li>It enable profiling to libraries and executables.</li>
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<li>It installs some useful binaries that might cause compilation error if not present.</li>
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</ol>
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<p>As the version of libraries is fixed up until you update the <a href="http://www.stackage.org/lts">Haskell LTS</a> version, you should never use cabal sandbox. That way, you will only compile each needed library once. The compiled objects/binaries will be in your <code>~/.cabal</code> directory.</p>
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<h2 id="some-last-words">Some Last Words</h2>
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<p>This script use the latest <a href="http://www.stackage.org/lts">Haskell LTS</a>. So if you use this script at different dates, the Haskell LTS might have changed.</p>
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<p>While it comes to cabal hell, some solutions are sandboxes and <code>nix</code>. Unfortunately, sandboxes didn’t worked good enough for me after some time. Furthermore, sandboxes forces you to re-compile everything by project. If you have three yesod projects for example it means a lot of time and CPU. Also, <code>nix</code> didn’t worked as expected on OS X. So fixing the list of package to a stable list of them seems to me the best pragmatic way to handle the problem today.</p>
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<p>From my point of view, <a href="http://www.stackage.org/lts">Haskell LTS</a> is the best step in the right direction. The actual cabal hell problem is more a human problem than a tool problem. This is a bias in most programmer to prefer resolve social issues using tools. There is nothing wrong with hackage and cabal. But for a package manager to work in a static typing language as Haskell, packages must work all together. This is a great strength of static typed languages that they ensure that a big part of the API between packages are compatible. But this make the job of package managing far more difficult than in dynamic languages.</p>
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<p>People tend not to respect the rules in package numbering<a href="#fn1" class="footnote-ref" id="fnref1"><sup>1</sup></a>. They break their API all the time. So we need a way to organize all of that. And this is precisely what <a href="http://www.stackage.org/lts">Haskell LTS</a> provide. A set of stable packages working all together. So if a developer break its API, it won’t work anymore in stackage. And whether the developer fix its package or all other packages upgrade their usage. During this time, <a href="http://www.stackage.org/lts">Haskell LTS</a> end-users will be able to develop without dependency issues.</p>
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<hr />
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<p class="small">
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<a href="https://www.flickr.com/photos/nesster/4198442186/">The image of the cat about to jump that I slightly edited can found here</a>
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</p>
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<section class="footnotes">
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<hr />
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<ol>
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<li id="fn1"><p>I myself am guilty of such behavior. It was a beginner error.<a href="#fnref1" class="footnote-back">↩</a></p></li>
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</ol>
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</section>
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<div id="totop"><a href="#header">↑ Top ↑</a></div>
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Published on 2014-08-16
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<a href="https://twitter.com/yogsototh">Follow @yogsototh</a>
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<a rel="license" href="http://creativecommons.org/licenses/by/3.0/deed.en_US">Yann Esposito©</a>
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<div>
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Done with
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<a href="http://www.vim.org" target="_blank" rel="noopener noreferrer nofollow"><strike>Vim</strike></a>
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<a href="http://spacemacs.org" target="_blank" rel="noopener noreferrer nofollow">spacemacs</a>
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<span class="pala">&</span>
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<a href="http://nanoc.ws" target="_blank" rel="noopener noreferrer nofollow"><strike>nanoc</strike></a>
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