David Anderson avatar David Anderson committed 05df943

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-;; Initialize packages, then apply followup settings.
+;; Initialize packages, with just Melpa as a source.
 (require 'package)
 (setq package-archives '(("melpa" . "http://melpa.milkbox.net/packages/")))
-(add-hook 'after-init-hook #'(lambda () (load "~/.emacs.d/preferences.el")))
-;; Some utilities. elisp is from the past, and doesn't have a filter
-;; function.
-(defun da-filter (condp lst)
-  (delq nil
-        (mapcar (lambda (x) (and (funcall condp x) x)) lst)))
+;; These are the packages that I want present on all machines.
 (setq da-desired-packages
+;; An implementation of filter, since elisp is from the past and
+;; doesn't have one.
+(defun da-filter (condp lst)
+  (delq nil
+        (mapcar (lambda (x) (and (funcall condp x) x)) lst)))
+;; Install missing packages before processing the rest of the
+;; preferences. Otherwise, the configuration will almost certainly
+;; fail to load.
 (let ((missing-packages (da-filter (lambda (x) (not (package-installed-p x))) da-desired-packages)))
   (when (not (null missing-packages))
     (if (y-or-n-p (format "Packages %s are missing. Install? " missing-packages))
           (mapc 'package-install missing-packages)))))
+;; Finally, chain off to other settings, once all packages are
+;; available to autoload.
+(add-hook 'after-init-hook #'(lambda () (load "~/.emacs.d/preferences.el")))
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