Add startup code

bin/packages.el

@@ -0,0 +1,31 @@
+;; Download and instll packages using https://github.com/raxod502/straight.el
+;; It's a functional package manager that integrates with https://github.com/jwiegley/use-package
+
+;; + Use the development branch
+;; + Integrate with use-package
+
+;; Apply the configurations prior to bootstrapping the package manager.
+
+(setq straight-repository-branch "develop"
+      straight-use-package-by-default t)
+
+;; Bootstrap the package manager.
+;; Download, Install, or Configuring depending on the state of the configuration.
+;; All packages build from source, pinned to specific git commit hashes.
+
+(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))
+
+;; Integrate with use-package by installing it with straight.
+
+(straight-use-package 'use-package)

bin/startup.el

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+;; Emacs creates a lot of files relative to `user-emacs-directory'.
+;; These files are not part of this immutable configuration and do not belong in the emacs directory.
+
+;; How can we solve this issue?
+
+;; Shortly after initialization, before most packages load, we change the value to `dotfiles/cache'.
+;; I elaborate more on the technique in my post https://chrishayward.xyz/immutable-emacs/.
+
+(setq user-emacs-directory dotfiles/cache)
+
+;; Because this project uses version-control, we can disable more unwanted features:
+
+;; + Lock files
+;; + Backup files
+
+(setq create-lockfiles nil
+      make-backup-files nil)