CODEWITHSUNDEEP
emacsfont-lock
Diaz
Diaz

Reputation: 987

How to set emacs operator color?

How can I set font color for operators? I'm programing in C++, and I would like operators such as '+', '=', '!=', '<<' and such be colored as I wish.

I tried move the cursor onto an operator and 'M-x customize-face' but it takes me to 'all faces' by default. Which is the one I should edit?

Upvotes: 2

Views: 1989

Answers (2)

PythonNut
PythonNut

Reputation: 6419

By default, operators are not font-locked in my version of c++-mode (Emacs 24.3 default). You can get the face under the cursor with C-u C-x =. To add font locking to operators you can add then this way:

(font-lock-add-keywords 'c++-mode
  '(("\\(~^<>:=,.\\+*/%-]\\)" 0 'highlight)))

The regex, and face may be customized. I am not a regex ninja, so the operators highlighted are very simplistic.

Upvotes: 0

PythonNut
PythonNut

Reputation: 6419

I believe this is what you're looking for.

;;       * the name of our face *
(defface font-lock-operator-face
  '((((class color)
       :background "darkseagreen2")))
  "Basic face for highlighting."
  :group 'basic-faces)

;; You'll have a hard time missing these colors
(set-face-foreground 'font-lock-operator-face "red")
(set-face-background 'font-lock-operator-face "blue")

(font-lock-add-keywords 'c++-mode
  '(("\\(~^&\|!<>:=,.\\+*/%-]\\)" 0 'font-lock-operator-face)))

Upvotes: 3

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