CODEWITHSUNDEEP
emacselispmode
Adobe
Adobe

Reputation: 13467

Emacs mode: how to specify that thing in square brackets should be colored

I write a simple emacs mode. How do I explicitly specify that all things in e.g. square brackets should be colored. Must be smth like that:

( (if thing is in square brackets) . font-lock-string-face)

Upvotes: 6

Views: 709

Answers (3)

Adobe
Adobe

Reputation: 13467

So here's a summary: To add new keywords to a mode

(font-lock-add-keywords 'emacs-lisp-mode
  '(("foo" . font-lock-keyword-face)))

It can have regexps:

(font-lock-add-keywords 'emacs-lisp-mode '(("\\[\\(.+?\\)\\]" . font-lock-keyword-face)))

(this makes font of everything in square brackets to be of a given color)

For the current mode and current emacs session – you can just evaluate the following:

(font-lock-add-keywords nil '(("\\[\\(.+?\\)\\]" . font-lock-keyword-face)))

(note - You don't specify a mode here)

To make it permanent You can add it as a hook to the mode:

(add-hook 'bk-grmx-mode-hook
          (lambda ()
            (font-lock-add-keywords nil '(("\\[\\(.+?\\)\\]" . font-lock-keyword-face)))
          )
)

You can also add it to a mode specification:

(define-derived-mode bk-grmx-mode fundamental-mode
  (setq font-lock-defaults '(bk-grmx-keyWords))
  ;; the next line is added:
  (font-lock-add-keywords nil '(("\\[\\(.+?\\)\\]" . font-lock-keyword-face)))
  (setq mode-name "bk-grmx-mode")

Upvotes: 3

joao
joao

Reputation: 3566

I assume you're writing a major mode, but font-lock-add-keywords works also in minor modes. Check out its documentation with C-h f RET font-lock-add-keywords.

(define-derived-mode my-mode text-mode "mymode"
  ;; some init code
  (font-lock-add-keywords nil '(("\\[\\(.*\\)\\]"
                                 1 font-lock-warning-face prepend)))
  ;; some more init code
)

Upvotes: 6

Noufal Ibrahim
Noufal Ibrahim

Reputation: 72745

You'd either have to extend the mode you're in to incorporate a new syntax rule or you can simply use highlight-regexp for quick and dirty highlighting.

Upvotes: 2

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