Add pretty symbols to ruby-mode

* lisp/progmodes/ruby-mode.el (ruby--prettify-symbols-alist): Add
pretty symbols (bug#48681).
(ruby-mode): Use them.

diff --git a/lisp/progmodes/ruby-mode.el b/lisp/progmodes/ruby-mode.el
index 0c54a1d27a6ad804fbcad3723a1038579dd68edb..cb8bbcd9b9a252106bc2a4b01e3903cc3319d22a 100644 (file)
--- a/lisp/progmodes/ruby-mode.el
+++ b/lisp/progmodes/ruby-mode.el
@@ -2421,6 +2421,14 @@ If there is no Rubocop config file, Rubocop will be passed a flag
    report-fn
    args))
 
+(defconst ruby--prettify-symbols-alist
+  '(("<=" . ?≤)
+    (">=" . ?≥)
+    ("->"  . ?→)
+    ("=>"  . ?⇒)
+    ("::" . ?∷))
+  "Value for `prettify-symbols-alist' in `ruby-mode'.")
+
 ;;;###autoload
 (define-derived-mode ruby-mode prog-mode "Ruby"
   "Major mode for editing Ruby code."
@@ -2437,6 +2445,7 @@ If there is no Rubocop config file, Rubocop will be passed a flag
 
   (setq-local font-lock-defaults '((ruby-font-lock-keywords) nil nil
                                    ((?_ . "w"))))
+  (setq-local prettify-symbols-alist ruby--prettify-symbols-alist)
 
   (setq-local syntax-propertize-function #'ruby-syntax-propertize))