From: Andrei Alexandrescu <SeeWebsiteForEmail@erdani.org>
To: help-gnu-emacs@gnu.org
Subject: Re: changing visuals of code in emacs
Date: Sun, 12 Oct 2008 17:18:37 -0500 [thread overview]
Message-ID: <K8nCty.180z@beaver.cs.washington.edu> (raw)
In-Reply-To: <874p3h1oau.fsf@hubble.informatimago.com>
Pascal J. Bourguignon wrote:
> Andrei Alexandrescu <SeeWebsiteForEmail@erdani.org> writes:
>
>> Pascal J. Bourguignon wrote:
>>> Andrei Alexandrescu <SeeWebsiteForEmail@erdani.org> writes:
>>>
>>>> Hello,
>>>>
>>>>
>>>> I'd like to change code visuals for the D programming language as
>>>> follows. I'd like the construct:
>>>>
>>>> Symbol!(balanced_parens)
>>>>
>>>> to be visualized as:
>>>>
>>>> Symbol«balanced_parens»
>>>>
>>>> The chevrons should appear electrically when I type the closing
>>>> ")". Note that balanced_parens could in turn nested use of "!()", as
>>>> in A!(B!(C)), and they should all be paired using chevrons. The
>>>> underlying file should not contain the chevrons, just the ASCII
>>>> representation using "!(" and ")".
>>>>
>>>> I haven't done much elisp programming beyond the common .emacs
>>>> configuration tricks, so I don't know where to start. A few searches
>>>> suggested that overlays may be what I'm looking for... any ideas and
>>>> pointers? Thank you.
>>> If you didn't ask for recursion, this could have be done with
>>> font-locking.
>>> (font-lock-add-keywords nil
>>> '(("\\(!(\\)[^()]*\\()\\)" 0 (progn
>>> (compose-region (match-beginning 1) (match-end 1) ?« 'decompose-region)
>>> (compose-region (match-beginning 2) (match-end 2) ?» 'decompose-region)
>>> nil))))
>>> But since this uses regular expressions, it won't work for recursive
>>> !(...).
>>> You can still use compose-region, but you'll have to implement the
>>> parsing yourself. Perhaps this could be hooked on the code doing the
>>> parenthesis balancing?
>> I think I'd be happy with a nonrecursive region to get my feet
>> wet. How do I use your font-lock-add-keywords code? I added it to both
>> my .emacs and my d-mode.el file, to no avail.
>
> You could run it from a d-mode-hook if it exists, ensuring that
> font-lock-mode is enabled.
>
> (add-hook 'd-mode-hook
> (lambda ()
> (font-lock-add-keywords nil
> '(("\\(!(\\)[^()]*\\()\\)" 0 (progn
> (compose-region (match-beginning 1) (match-end 1) ?« 'decompose-region)
> (compose-region (match-beginning 2) (match-end 2) ?» 'decompose-region)
> nil))))
> (font-lock-mode 1)))
>
Thanks! I got that working. It ought to get me started.
Regards,
Andrei
prev parent reply other threads:[~2008-10-12 22:18 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-12 20:11 changing visuals of code in emacs Andrei Alexandrescu
2008-10-12 20:48 ` Pascal J. Bourguignon
2008-10-12 21:06 ` Andrei Alexandrescu
2008-10-12 21:44 ` Pascal J. Bourguignon
2008-10-12 22:18 ` Andrei Alexandrescu [this message]
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