From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Carsten Dominik <carsten.dominik@gmail.com>
Cc: emacs-devel Mailinglist <emacs-devel@gnu.org>
Subject: Re: Feature proposal/request: Indentation driven by display engine
Date: Mon, 26 May 2008 17:02:19 -0400 [thread overview]
Message-ID: <jwvej7ookgs.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <DFF24921-ED48-41DA-B48B-BAD7039830BF@gmail.com> (Carsten Dominik's message of "Sat, 24 May 2008 22:22:46 +0200")
>> Can't you remove the display property when you fold to avoid the problem?
> I could, but then I would have to add and remove text properties during
> each fold/unfold, quite some unnecessary overhead.
Not sure how much of an overhead that would be. Doesn't seem major.
It might be inconvenient to code, tho. Is that what you meant?
>>> It then occurred to me that it might be useful to support
>>> such a feature directly in the display engine.
>>> For example, if the line contains text with an `indentation'
>>> property, the display engine would add this amount of white
>>> space to before the beginning of the line, maybe also a vertical
>>> line indicating the location of the margin.
>>
>> This property would still need to be added to every line. So basically
>> all you're asking is a "before-string" text-property, maybe?
> Hmm, nice translation of my request. Yes, basically what I am
> asking for is a working before-string text property. I know
> that adding the property sounds like a lot of effort, but I could
> use the font-lock/jit-lock setup to get this done efficiently,
> only for the pieces that actually get displayed.
The same has been requested for display properties (e.g. to put
something in the margin without hiding any of the current text, you
need an overlay).
A `before-string' text-property might be doable, but I couldn't tell you
how easy it'd be to add. If someone wants to implement that, I might
accept it (e.g., as a form of `display' property), but if I were you
I wouldn't hold my breath (we have enough bugs to fix and are getting
close to feature freeze).
The best I can offer for now, is to use overlays which you add via
jit-lock and which you eagerly remove in the background (so they don't
accumulate).
>> How 'bout modifying the actual buffer text directly?
> Yes, this is in fact what I am doing now, I use TAB, and
> wrapping/paragraph-fill support to get fill prefixes. I also modify
> indentation during promotion and demotion of entries.
> However, there are some disadvantages to this. One obvious one is
> this: Org contains a publishing part, and for publishing
> we allow examples like code snippets, where indentation might be
> important. So the
> #+BEGIN_EXAMPLE
> #+END_EXAMPLE
> construct should be flush to the left margin.
I'm not sure I understand why that makes any difference.
> Are we going to get a before-string property? WOuld be cool.
Well... patches welcome,
Stefan
next prev parent reply other threads:[~2008-05-26 21:02 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-24 12:15 Feature proposal/request: Indentation driven by display engine Carsten Dominik
2008-05-24 18:48 ` Stefan Monnier
2008-05-24 20:22 ` Carsten Dominik
2008-05-26 21:02 ` Stefan Monnier [this message]
2008-05-27 8:24 ` Carsten Dominik
2008-05-24 23:02 ` Stephen Berman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/emacs/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=jwvej7ookgs.fsf-monnier+emacs@gnu.org \
--to=monnier@iro.umontreal.ca \
--cc=carsten.dominik@gmail.com \
--cc=emacs-devel@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/emacs.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).