Rename extra modules with extra- prefix

modules/extra-demo.el

@@ -0,0 +1,30 @@
+;;; extra-demo.el --- for collaboration and demonstrations
+
+;; This library offers:
+;;   + impatient-mode: for broadcasting my emacs session
+;;   + big-mode: for enlarged text while screencasting
+;;   + integration with reveal.js for presentations
+
+;; Big-mode settings
+(defconst big-mode-font (font-spec :family "Hack" :size 16))
+(defconst big-mode-line-spacing 0)
+(defconst big-mode-modeline-height 26)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(use-package impatient-mode
+  :defer t
+  :commands httpd-start)
+
+(defvar big-mode--line-spacing line-spacing)
+(defvar big-mode--powerline-height powerline-height)
+(define-minor-mode big-mode
+  :init-value nil
+  :lighter " BIG"
+  :global t
+  (setq-default powerline-height (if big-mode big-mode-modeline-height big-mode--powerline-height))
+  (narf/load-font (if big-mode big-mode-font narf-default-font))
+  (setq-default line-spacing (if big-mode big-mode-line-spacing big-mode--line-spacing)))
+
+(provide 'extra-demo)
+;;; extra-demo.el ends here