spacemacs/layers/+lang/clojure/funcs.el

;;; funcs.el --- Clojure Layer functions File for Spacemacs
;;
;; Copyright (c) 2012-2016 Sylvain Benner & Contributors
;;
;; Author: Sylvain Benner <sylvain.benner@gmail.com>
;; URL: https://github.com/syl20bnr/spacemacs
;;
;; This file is not part of GNU Emacs.
;;
;;; License: GPLv3

(defun clojure/fancify-symbols (mode)
  "Pretty symbols for Clojure's anonymous functions and sets,
   like (λ [a] (+ a 5)), ƒ(+ % 5), and ∈{2 4 6}."
  (font-lock-add-keywords mode
    `(("(\\(fn\\)[\[[:space:]]"
       (0 (progn (compose-region (match-beginning 1)
                                 (match-end 1) "λ"))))
      ("(\\(partial\\)[\[[:space:]]"
       (0 (progn (compose-region (match-beginning 1)
                                 (match-end 1) "Ƥ"))))
      ("(\\(comp\\)[\[[:space:]]"
       (0 (progn (compose-region (match-beginning 1)
                                 (match-end 1) "∘"))))
      ("\\(#\\)("
       (0 (progn (compose-region (match-beginning 1)
                                 (match-end 1) "ƒ"))))
      ("\\(#\\){"
       (0 (progn (compose-region (match-beginning 1)
                                 (match-end 1) "∈")))))))