* Void variable error in fontification code
@ 2016-11-11 2:29 Davin Pearson
2016-11-11 16:04 ` Michael Heerdegen
0 siblings, 1 reply; 2+ messages in thread
From: Davin Pearson @ 2016-11-11 2:29 UTC (permalink / raw
To: help-gnu-emacs
How come with the following lines of elisp code commented out:
;;(setq d-face-m4 'd-face-m4)
;;(setq d-face-m4-dnl 'd-face-m4-dnl)
I get the following error in my *Messages* buffer:
Error during redisplay: (jit-lock-function 9575) signaled (void-variable d-face-m4-dnl) [9 times]
Putting back the lines like so:
(setq d-face-m4 'd-face-m4)
(setq d-face-m4-dnl 'd-face-m4-dnl)
gets rid of the error messages.
I have the following lines of elisp code in my .emacs file:
(defun d-font-lock-add-begin (keywords)
(if (fboundp 'font-lock-add-keywords)
(font-lock-add-keywords nil keywords nil)
(setq font-lock-keywords
(append
keywords
font-lock-keywords))))
(d-font-lock-add-begin
`(
(,(concat "\\(\\<m4_" "dnl\\)\\(.$\\)") (1 d-face-m4-dnl t) (2 font-lock-comment-face))
)
)
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Void variable error in fontification code
2016-11-11 2:29 Void variable error in fontification code Davin Pearson
@ 2016-11-11 16:04 ` Michael Heerdegen
0 siblings, 0 replies; 2+ messages in thread
From: Michael Heerdegen @ 2016-11-11 16:04 UTC (permalink / raw
To: Davin Pearson; +Cc: help-gnu-emacs
Davin Pearson <davin.pearson@gmail.com> writes:
> (setq d-face-m4 'd-face-m4)
> (setq d-face-m4-dnl 'd-face-m4-dnl)
> (,(concat "\\(\\<m4_" "dnl\\)\\(.$\\)") (1 d-face-m4-dnl t) (2 font-lock-comment-face))
I think you get confused by the fact that symbols are used as face
names. For font lock keywords, faces are specified via face
expressions. You specify a variable above, so its value has to be set
(to a face name), else you get the unbound error.
Instead, you can directly specify a face in form of a symbol, and since
this place is evaluated, you need to quote the name.
It's a bit weird in Emacs that faces effectively use a separate name
space, but they are specified as symbols, and in some cases, variables
having the same name as a face are bound to that face name (symbol).
Michael.
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2016-11-11 2:29 Void variable error in fontification code Davin Pearson
2016-11-11 16:04 ` Michael Heerdegen
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