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    <p>I'm answering myself here because in the end I opted for an alternate solution.</p> <p>phils' answer is still valid, but I found it troublesome to have the .emacs.d directory under version control, and to be fair I didn't want to bother with fake submodules. </p> <p>What I did instead: I contacted el-get's maintainer, Dimitri, and presented him with the problem. </p> <p>Dimitri said: </p> <blockquote> <p>I could see us adding an el-get-cleanup function that you would have to call with the current list of packages and that would el-get-remove any package already installed locally but not on the provided list.</p> </blockquote> <pre class="lang-el prettyprint-override"><code>(el-get-cleanup my-packages) </code></pre> <blockquote> <p>You could then use that from your user-init-file if you want to, or do that as a routine every now and then.</p> </blockquote> <p>With his guidance, I then wrote the function in question. </p> <pre class="lang-el prettyprint-override"><code>(defun el-get-cleanup (packages) "Remove packages not explicitly declared" (let* ((packages-to-keep (el-get-dependencies (mapcar 'el-get-as-symbol packages))) (packages-to-remove (set-difference (mapcar 'el-get-as-symbol (el-get-list-package-names-with-status "installed")) packages-to-keep))) (mapc 'el-get-remove packages-to-remove))) </code></pre> <p>Ah, the joys of open source...</p> <p>(See also my blog <a href="http://danielsz.github.io/towards-a-declarative-dependency-management-s/index.html" rel="nofollow noreferrer">post</a>)</p>
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    1. POel-get in a portable emacs configuration solution
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    1. USDaniel Szmulewicz
    1. USDaniel Szmulewicz
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    1. COThanks! I'm using both git and el-get for making my set-up portable. Wasn't sure how to declare packages that el-get should install on a new system, but your solution covers not only that but also removing packages that you no longer need. Brilliant!
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      1. USKonstantin K
    2. COBy the way, this `el-get-cleanup` function has been added to the codebase : https://github.com/dimitri/el-get/commit/7ba81d6bf03817506b4bc5134b095a4c4fa8541b
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