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-title: Syncing Required Packages in Emacs
-date: 2013-12-30 11:30
-tags: emacs, wsu
-summary: A simple way to keep Emacs packages synced across machines using package.el
----
-
-I use Emacs on several different computers.  To keep my configuration
-consistent across all of them, I do what many people do and made the
-`~/.emacs.d` directory a
-[git repository](https://github.com/davexunit/.emacs.d).  I don’t like
-to keep copies of all of the Elisp extensions that I use, such as
-paredit and geiser, in this repository.  Instead, I prefer to use
-package.el (introduced in Emacs 24) with the
-[MELPA](https://melpa.org) repository.  This saves me from having to
-manually keep all of the extensions I use up-to-date, but requires
-another method to keep useful packages in sync between computers.
-
-There’s a project called
-[Pallet](https://github.com/rdallasgray/pallet) that solves this
-problem, but it was too heavy for my liking.  Instead, I wrote a short
-function that simply iterates over a list of required packages and
-installs those that are not currently installed.
-
-```elisp
-;; Additional packages that I use.
-(setq required-packages
-      '(better-defaults
-        elfeed
-        geiser
-        ido-ubiquitous
-        js2-mode
-        magit
-        paredit
-        rainbow-delimiters
-        smex))
-
-(defun install-missing-packages ()
-  "Install all required packages that haven’t been installed."
-  (interactive)
-  (mapc (lambda (package)
-          (unless (package-installed-p package)
-            (package-install package)))
-        required-packages)
-  (message "Installed all missing packages!"))
-```
-
-Now, it’s as easy as typing `M-x install-missing-packages RET` when
-starting Emacs for the first time on a new computer to download all of
-the extensions that I need.  Note that before calling
-`install-missing-packages` you must have already initialized the
-package manager via the `package-initialize` function.  This approach
-does require some manual bookkeeping in order to keep the
-`required-packages` list up-to-date with your workflow, but I haven’t
-found it to be problematic.
-
-Update: If this solution is too simplistic for you, you should check
-out [use-package](https://github.com/jwiegley/use-package), which
-reddit user [lunayorn](http://www.reddit.com/user/lunaryorn) pointed
-out to me.  Thanks!
-
-Check out the comments on
-[reddit](http://www.reddit.com/r/emacs/comments/1u0xr4/quick_hack_syncing_required_packages_in_emacs/).