How to save a list of all the installed packages in Emacs 24?

Asked 13/12, 2012 at 19:18 Answered 15/9, 2019 at 11:55

Solved emacs emacs24 dot-emacs emacs-prelude

I am using prelude as a base Emacs configuration. I have installed lots of packages from the package manager, and I want to use my settings on another machine.

I don't want to carry the installed packages and also I don't want to create a list manually.

What is the way of saving a list all the installed packages into prelude-package.el or any other file so that when I take this configuration to my other machine, they automatically get installed there on first use?

Overrefinement answered 13/12, 2012 at 19:18 Comment(0)

You can get a list of currently installed packages (excluding built in packages) from the variable package-activated-list. To automatically install them on startup, see this question: how to automatically install emacs packages by specifying a list of package names?

More specifically, if you do C-h v package-activated-list, copy the value shown, and insert it as the value of prelude-packages, emacs will automatically ensure those packages are installed on start up.

Wieland answered 13/12, 2012 at 19:29 Comment(1)

It is worth noting, the package-activated list is not updated by removing packages, but seems only on restart. – Gantz 9/2, 2018 at 9:19

The canonical method is the best (described by ataylor). Here is a more clumsy method.

M-x list-packages. C-s installed till you find the first row of installed package. Start selecting with C-SPC. Go down till you reach built-in packages. Copy with M-w. C-x b for new buffer. Paste with C-y.C-x C-s to save file.

The only advantage that I see is this is a tad more descriptive — it shows a short description of your packages; which is useful when you install some packages and forget about them.

Malposition answered 3/4, 2014 at 4:57 Comment(1)

Yes - I like that this adds a bit more description than the package-activated-list – Becker 13/3, 2016 at 19:57

As mentioned at how to automatically install emacs packages by specifying a list of package names?, it would be better to also record the version of the package you need. In order to do so, you can use the following function:

(defun list-packages-and-versions ()
  "Returns a list of all installed packages and their versions"
  (mapcar
   (lambda (pkg)
     `(,pkg ,(package-desc-version
                (cadr (assq pkg package-alist)))))
   package-activated-list))

That will give you a list of (NAME VERSION) pairs. Unfortunately, I haven't been able to find a way to install a specific version of a package. It seems package.el always grabs the latest available. What I'm doing now is:

(defun install-packages-with-specific-versions (package-version-list)
  "Install the packages in the given list with specific versions.
PACKAGE-VERSION-LIST should be a list of (NAME VERSION) lists,
where NAME is a symbol identifying the package and VERSION is
the minimum version to install."
  (package-download-transaction
   (package-compute-transaction () package-version-list)))

I've written a longer function to install packages matching the exact version number, but it fails because package.el by default only retrieves the latest versions available for each package. gist

Jacinthe answered 4/10, 2016 at 15:1 Comment(0)

As described above, using emacs normal mode. Here another the evil-mode way of doing it:

M-x list-packages; /installed (they will be highlighted); v (for visual-mode); j (to select them); y (to copy them); open a new buffer and paste them.

Virginiavirginie answered 15/9, 2019 at 11:55 Comment(0)

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