Convert symbol prettification into minor mode and global minor mode.

* etc/NEWS: Document new Prettify Symbols mode.

* lisp/progmodes/prog-mode.el (prettify-symbols-alist): Rename from
  `prog-prettify-symbols', and make a local defvar instead of defcustom.
  (prettify-symbols--keywords): Rename from `prog-prettify-symbols-alist'
  and make a local defvar.
  (prettify-symbols--compose-symbol): Rename from
  `prog--prettify-font-lock-compose-symbol'.
  (prettify-symbols--make-keywords): Rename from
  `prog-prettify-font-lock-symbols-keywords' and simplify.
  (prog-prettify-install): Remove.
  (prettify-symbols-mode): New minor mode, based on `prog-prettify-install'.
  (turn-on-prettify-symbols-mode): New function.
  (global-prettify-symbols-mode): New globalized minor mode.

* lisp/emacs-lisp/lisp-mode.el (lisp-mode-variables):
* lisp/progmodes/cfengine.el (cfengine3-mode):
* lisp/progmodes/perl-mode.el (perl-mode): Don't call `prog-prettify-install';
  set `prettify-symbols-alist' instead.

1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/progmodes/cfengine.el b/lisp/progmodes/cfengine.el
index 01b5faef5b3..55d5b8b0be7 100644
--- a/lisp/progmodes/cfengine.el
+++ b/lisp/progmodes/cfengine.el
@@ -547,7 +547,7 @@ to the action header."
   (setq font-lock-defaults
         '(cfengine3-font-lock-keywords
           nil nil nil beginning-of-defun))
-  (prog-prettify-install cfengine3--prettify-symbols-alist)
+  (setq-local prettify-symbols-alist cfengine3--prettify-symbols-alist)
 
   ;; Use defuns as the essential syntax block.
   (set (make-local-variable 'beginning-of-defun-function)