Re: Define list of packages in ~/.emacs.d/init.el

[Stefan Monnier <monnier@iro.umontreal.ca>]

> (defvar required-packages
>   '(auctex
>     yasnippet)
>   "a list of packages to ensure are installed at launch.")

Recent Emacsen use the variable `package-selected-packages` for that.

> ; method to check if all packages are installed
> (defun packages-installed-p ()
>   (loop for p in required-packages
>         when (not (package-installed-p p)) do (return nil)
>         finally (return t)))

> ; if not all packages are installed, check one by one and install the missing ones.
> (unless (packages-installed-p)
>   ; check for new packages (package versions)
>   (message "%s" "Emacs is now refreshing its package database...")
>   (package-refresh-contents)
>   (message "%s" " done.")
>   ; install the missing packages
>   (dolist (p required-packages)
>     (when (not (package-installed-p p))
>       (package-install p))))

AFAIK current Emacsen do not provide this functionality.  I'm opposed to
having such a thing fully automatic (because Emacs shouldn't initiate
a connection to the internet without some explicit user request), but
since many users seem to actively want such a misfeature, I think Emacs
should probably offer this functionality (disabled by default, and with
a suitable warning on the label).

So, I suggest you `M-x report-emacs-bug` and request this
optional functionality.


        Stefan