.emacs.d/init.d/basics/package-management.el

;;; package-management.el --- Initialize package management -*- lexical-binding: t; -*-

;; Time-stamp: <2020-05-24T22:15:31+0200>

;;; Commentary:
;; * Set up straight
;; * Set up use-package.

;;; Code:

;; Workaround for < 26.3 <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=34341>.
(when (and (< emacs-major-version 27)
           (not (string= emacs-version "26.3")))
  (defvar gnutls-algorithm-priority "NORMAL:-VERS-TLS1.3"))

;; Define variables for straight.
(customize-set-variable
 'straight-use-package-by-default t
 "Makes use-package invoke straight.el to install the package.")
(customize-set-variable 'straight-cache-autoloads t
                        "Cache the autoloads of all packages in a single file.")

;; Use shallow clones if available disk space is under 5 GiB.
(when (or (< emacs-major-version 27)    ; file-system-info was introduced in 27.
          (< (nth 2 (file-system-info user-emacs-directory))
             (* 1024 1024 1024 5))) ; 5 GiB.
  (customize-set-variable 'straight-vc-git-default-clone-depth 1
                          "Make shallow clones to save space."))

(customize-set-variable 'straight-repository-branch "master")
;; Bootstrap straight.
(defvar bootstrap-version)
(let ((bootstrap-file
       (expand-file-name "straight/repos/straight.el/bootstrap.el"
                         user-emacs-directory))
      (bootstrap-version 5))
  (unless (file-exists-p bootstrap-file)
    (with-current-buffer
        (url-retrieve-synchronously
         "https://raw.githubusercontent.com/raxod502/straight.el/develop/install.el"
         'silent 'inhibit-cookies)
      (goto-char (point-max))
      (eval-print-last-sexp)))
  (load bootstrap-file nil 'nomessage))

(require 'straight)                     ; Shut up flycheck.

(add-hook 'after-init-hook #'straight-prune-build) ; Remove unnused packages.

;; Isolate package configurations.
(straight-use-package 'use-package)
(customize-set-variable 'use-package-always-defer t)

(defun my/straight-check-last-update ()
  "Notify if 7 days have passed since the last package was built."
  (let ((days 7)
        (mtime-seconds (time-to-seconds
                        (file-attribute-modification-time
                         (file-attributes (straight--build-dir))))))
    (when (> (- (time-to-seconds) mtime-seconds)
             (* 60 60 24 days))
      (message "The last package update was more than %d days ago." days))))
(add-hook 'emacs-startup-hook #'my/straight-check-last-update)

(defun my/straight-update-repos ()
  "Update MELPA, ELPA and Emacsmirror."
  (interactive)
  (straight-pull-package 'melpa)
  (straight-pull-package 'gnu-elpa-mirror)
  (straight-pull-package 'emacsmirror-mirror))

(provide 'basics/package-management)
;;; package-management.el ends here