bug#48681: Patch: Make prettify-symbols-mode work with ruby-mode

[William Denton <wtd@pobox.com>]

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Hello,

Attached is a small patch that will make prettify-symbols-mode work in 
ruby-mode.  It just adapts the code that's there for perl-mode, using some of 
the symbols from python-mode.

This is my first time submitting a patch, and I hope it and this commit message 
are close to what's needed:

# -----

Make prettify-symbols-mode work with ruby-mode

* lisp/progmodes/ruby.el
   (ruby--prettify-symbols-alist): New defvar with default symbols
   to prettify; prettify-symbols-alist is then set to this

# ------

My papers are signed and on file.

Thanks,

William Denton

--
William Denton
https://www.miskatonic.org/
Librarian, artist and licensed private investigator.

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diff --git a/lisp/progmodes/ruby-mode.el b/lisp/progmodes/ruby-mode.el
index 0c54a1d27a..f6bb9c43db 100644
--- a/lisp/progmodes/ruby-mode.el
+++ b/lisp/progmodes/ruby-mode.el
@@ -2421,6 +2421,11 @@ ruby-flymake-auto
    report-fn
    args))
 
+(defconst ruby--prettify-symbols-alist
+  '(("and" . ?∧)
+    ("or" . ?∨))
+  "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 +2442,7 @@ ruby-mode
 
   (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))