+** =prog-mode=
+
+#+begin_src emacs-lisp
+(use-feature prog-mode
+ :config (global-prettify-symbols-mode)
+ (defun indicate-buffer-boundaries-left ()
+ (setq indicate-buffer-boundaries 'left))
+ (add-hook 'prog-mode-hook #'indicate-buffer-boundaries-left))
+#+end_src
+
+** =text-mode=
+
+#+begin_src emacs-lisp
+(use-feature text-mode
+ :hook ((text-mode . indicate-buffer-boundaries-left)
+ (text-mode . abbrev-mode)))
+#+end_src
+
+** =lisp-mode=
+
+#+begin_src emacs-lisp
+(use-feature lisp-mode
+ :config
+ (add-hook 'emacs-lisp-mode-hook 'outline-minor-mode)
+ (add-hook 'emacs-lisp-mode-hook 'reveal-mode)
+ (defun indent-spaces-mode ()
+ (setq indent-tabs-mode nil))
+ (add-hook 'lisp-interaction-mode-hook #'indent-spaces-mode))
+#+end_src
+