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On multi-line font lock
From: |
Mark Oteiza |
Subject: |
On multi-line font lock |
Date: |
Wed, 13 Sep 2017 20:54:18 -0400 |
Hi,
I'm writing to ask about correct use of font-lock-multiline and
font-lock-extend-* hooks, and possibly for a working example if possible.
I was writing a mode for mailcap files and was struggling to write
working elisp for handling multi-line constructs. In mailcap, comments
begin with a # at BOL, and lines can be broken by a trailing \ in a
non-comment line:
application/foobar; baz; copiousoutput; \
# not a comment \
# a comment
I discovered an existing mailcap-mode here:
http://user42.tuxfamily.org/mailcap-mode/index.html
which appears to take advantage of jit-lock-contextually. I also
managed to figure out syntax-propertize to a degree, with the help of
some blog examples.
However, I'm not fond of jit-lock's delay (which is
configurable, but defaults are defaults are defaults), so I tried to get
the non-jit-lock option to work. The attached
package somehow appears to be a working example of using
font-lock-extend-region-functions.
I'm puzzled because the function I've added to the hook always returns a
truthy value AFAICT, and the documentation suggests the hook is run
until all of its items return nil.
What is the correct way to use font-lock-extend-foo hooks?
Please Cc:, thanks.
mailcap-mode.el
Description: mailcap-mode package
- On multi-line font lock,
Mark Oteiza <=