Variable: prettify-symbols-mode
prettify-symbols-mode is a buffer-local variable defined in
prog-mode.el.gz.
Documentation
Non-nil if Prettify-Symbols mode is enabled.
Use the command prettify-symbols-mode(var)/prettify-symbols-mode(fun) to change this variable.
Probably introduced at or before Emacs version 24.4.
Key Bindings
Source Code
;; Defined in /usr/src/emacs/lisp/progmodes/prog-mode.el.gz
;;;###autoload
(define-minor-mode prettify-symbols-mode
"Toggle Prettify Symbols mode.
When Prettify Symbols mode and font-locking are enabled, symbols are
prettified (displayed as composed characters) according to the rules
in `prettify-symbols-alist' (which see), which are locally defined
by major modes supporting prettifying. To add further customizations
for a given major mode, you can modify `prettify-symbols-alist' thus:
(add-hook \\='emacs-lisp-mode-hook
(lambda ()
(push \\='(\"<=\" . ?≤) prettify-symbols-alist)))
You can enable this mode locally in desired buffers, or use
`global-prettify-symbols-mode' to enable it for all modes that
support it."
:init-value nil
(when prettify-symbols--keywords
(font-lock-remove-keywords nil prettify-symbols--keywords)
(setq prettify-symbols--keywords nil))
(if prettify-symbols-mode
;; Turn on
(when (setq prettify-symbols--keywords (prettify-symbols--make-keywords))
(font-lock-add-keywords nil prettify-symbols--keywords)
(setq-local font-lock-extra-managed-props
(append font-lock-extra-managed-props
'(composition
prettify-symbols-start
prettify-symbols-end)))
(when prettify-symbols-unprettify-at-point
(add-hook 'post-command-hook
#'prettify-symbols--post-command-hook nil t))
(font-lock-flush))
;; Turn off
(remove-hook 'post-command-hook #'prettify-symbols--post-command-hook t)
(when (memq 'composition font-lock-extra-managed-props)
(setq font-lock-extra-managed-props (delq 'composition
font-lock-extra-managed-props))
(with-silent-modifications
(remove-text-properties (point-min) (point-max) '(composition nil))))))