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+;; Path Functions
+
+(require 'xdg)
+
+(defun my/cache-file-name (name)
+  (expand-file-name name (concat (xdg-cache-home) "/emacs")))
+
+(defun my/data-file-name (name)
+  (expand-file-name name (concat (xdg-data-home) "/emacs")))
+
+
+;; Theme Functions
+
+(defun my/macos-dark-p ()
+  "Returns non-nil if macOS is currently in dark mode, nil otherwise."
+  (interactive)
+  (string= (shell-command-to-string "defaults read -g AppleInterfaceStyle")
+           "Dark\n"))
+
+(defun my/maybe-switch-theme (light-theme dark-theme enable-dark-theme-p)
+  "Switch between themes.
+
+If ENABLE-DARK-THEME-P returns a non-nil value, then DARK-THEME
+is enabled and LIGHT-THEME is disabled, unless DARK-THEME is
+already enabled. The opposite happens if ENABLE-DARK-THEME-P
+returns nil."
+  (if (funcall enable-dark-theme-p)
+      (unless (member dark-theme custom-enabled-themes)
+        (load-theme dark-theme :no-confirm)
+        (disable-theme light-theme))
+    (unless (member light-theme custom-enabled-themes)
+      (load-theme light-theme :no-confirm)
+      (disable-theme dark-theme))))
+
+
+;; “Window Management” Functions
+
+(defun my/center-frame (&optional frame)
+  "Center FRAME."
+  (interactive)
+  (modify-frame-parameters frame '((left . 0.5) (top . 0.5))))
+
+(defun my/focus-frame (&optional frame)
+  "Focus FRAME."
+  (interactive)
+  (delete-other-windows)
+  (modify-frame-parameters frame '((fullscreen . fullheight)
+                                   (left . 0.5)
+                                   (width . 100))))
+
+
+;; Misc. Stuff
+
+(defun my/display-startup-time ()
+  "Displays a message saying how long it took Emacs to load."
+  (message "Emacs loaded in %.2f seconds with %d garbage collections done."
+           (float-time (time-subtract after-init-time before-init-time))
+           gcs-done))
+
+(defmacro my/with-add-hook (hook &rest body)
+  (declare (indent 1) (debug t))
+  `(add-hook ,hook #'(lambda () ,@body)))