Stop calling package-initialize in version 27

To prevent Emacs from modifying a  user's init file behind their back,
the developers have decided that:

- by default,  Emacs will  call package-initialize before  loading the
  user's init  file (thereby ensuring that  out-of-the-box, when Emacs
  starts, it activates packages installed in a previous session);

- the  user can  disable packages  (among other  things) using  a new,
  "early-init"  file  that  will  be read  before  package  management
  kicks in.

This has been committed to Emacs's master branch, so versions up to 26
still need to call package-initialize.

While in there,  tuck package-archives in the  Custom file.  Hopefully
in a few years I can remove all this package cruft from my init file.

2 files changed, 9 insertions, 3 deletions

diff --git a/.emacs b/.emacs
index b7a9eb4..ab0e3e1 100644
--- a/.emacs
+++ b/.emacs
@@ -7,9 +7,11 @@
 ;; resets global-page-break-lines-mode to nil.  Cue Custom shrugging,
 ;; "changed outside Customize".
 
-(require 'package)
-(add-to-list 'package-archives '("melpa" . "https://melpa.org/packages/"))
-(package-initialize)
+;; NB: starting from Emacs 27, package-initialize is automatically
+;; called before loading the user's init file, unless
+;; package-enable-at-startup is set to nil in the early init file.
+(when (version< emacs-version "27")
+  (package-initialize))
 
 (setq custom-file "~/.emacs-custom.el")
 (load custom-file)
diff --git a/.emacs-custom.el b/.emacs-custom.el
index 04494cd..734cdcc 100644
--- a/.emacs-custom.el
+++ b/.emacs-custom.el
@@ -43,6 +43,10 @@
  '(markdown-enable-math t)
  '(markdown-header-scaling t)
  '(menu-bar-mode nil)
+ '(package-archives
+   (quote
+    (("melpa" . "https://melpa.org/packages/")
+     ("gnu" . "http://elpa.gnu.org/packages/"))))
  '(package-selected-packages
    (quote
     (rg delight paradox flycheck magit markdown-mode page-break-lines rust-mode wgrep)))