From: JD Smith <jdtsmith@gmail.com>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org
Subject: Re: Selective font-locking?
Date: Sun, 11 Apr 2021 16:54:28 -0400 [thread overview]
Message-ID: <65B869A0-CB0B-43C1-90EA-E2B259A74589@gmail.com> (raw)
In-Reply-To: <jwva6q4hjnk.fsf-monnier+emacs@gnu.org>
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Definitely worth trying, thanks. I came up with:
(defun python-shell-multiline--apply-font-lock (limit)
(let ((end (cdr-safe comint-last-prompt)))
(if (and end (> limit end))
(let ((font-lock-keywords python-font-lock-keywords)
(font-lock-syntactic-face-function
#'python-font-lock-syntactic-face-function)
(start (max end (point))))
(font-lock-flush start limit)
(font-lock-ensure start limit)))))
(set (make-local-variable 'font-lock-keywords)
'(python-shell-multiline--apply-font-lock)))
I can verify that font-lock-ensure is being called on an appropriate region (lots of times). With either font-lock-flush or font-lock-ensure, no actual fontification occurs. With both of these together (as above), this error is signaled:
Error during redisplay: (jit-lock-function 179) signaled (void-function python-font-lock-keywords-level-1)
Note that python-font-lock-keywords is a *list* beginning with this symbol:
Python-font-lock-keywords is a variable defined in ‘python.el’.
Its value is
(python-font-lock-keywords-level-1 python-font-lock-keywords-level-1 python-font-lock-keywords-level-2 python-font-lock-keywords-maximum-decoration)
Not sure why jit-lock-function would be evaluating it like an sexp.
> On Apr 11, 2021, at 12:31 PM, Stefan Monnier <monnier@iro.umontreal.ca> wrote:
>
>> But then, why bother round-tripping text out to a special-use buffer anyway,
>> vs. just letting font-lock operate in-situ in the shell buffer itself using
>> python-mode’s fairly simple font-lock-defaults. The only thing needed to
>> make this work is asking font-lock to ignore all the text with ‘field of
>> ‘output?
>
> Maybe you can try something like the following?
>
> (defvar python--font-lock-keywords ...)
> (defvar python-font-lock-keywords
> '(python--apply-font-lock))
> (defun python--apply-font-lock (limit)
> (while (< (point) limit)
> (let ((next-boundary (find-next-boundary limit)))
> (if (we-should-skip-this-block)
> (goto-char next-boundary)
> (let ((font-lock-keywords python--font-lock-keywords))
> (font-lock-ensure (point) limit))))))
>
>
> -- Stefan
>
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next prev parent reply other threads:[~2021-04-11 20:54 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-11 15:27 Selective font-locking? JD Smith
2021-04-11 16:31 ` Stefan Monnier
2021-04-11 20:54 ` JD Smith [this message]
2021-04-11 21:10 ` Stefan Monnier
2021-04-13 1:51 ` JD Smith
2021-04-13 2:07 ` Stefan Monnier
2021-04-13 3:33 ` JD Smith
2021-04-13 4:04 ` Stefan Monnier
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