all messages for Emacs-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
From: Stephen Berman <stephen.berman@gmx.net>
To: Eli Zaretskii <eliz@gnu.org>
Cc: Tassilo Horn <tassilo@member.fsf.org>, emacs-devel@gnu.org
Subject: Re: Indentation and visual-line-mode
Date: Fri, 25 Nov 2011 13:38:10 +0100	[thread overview]
Message-ID: <87bos0l6ml.fsf@escher.home> (raw)
In-Reply-To: <83k46o8lmi.fsf@gnu.org> (Eli Zaretskii's message of "Fri, 25 Nov 2011 13:52:37 +0200")

On Fri, 25 Nov 2011 13:52:37 +0200 Eli Zaretskii <eliz@gnu.org> wrote:

>> From: Tassilo Horn <tassilo@member.fsf.org>
>> Date: Fri, 25 Nov 2011 10:34:25 +0100
>> 
>> --8<---------------cut here---------------start------------->8---
>>   \begin{itemize}
>>   \item Foo bar baz foo
>> bar baz foo
>>   \item Bar baz foo bar
>> baz
>>   \end{itemize}
>> --8<---------------cut here---------------end--------------->8---
>> 
>> which looks pretty weird.  Is there some option that allows the wrapped
>> lines to be visually indented relative to the current logical line?
>
> I doubt that, because logical indentation and display-time wrap or
> prefixing are two very different features on two very different
> levels.  Logical indentation is actually present in the buffer, while
> display-time features are produced by the display engine on the fly,
> without any consideration of previous lines.
>
>> Checking the docs, I think something like that can be achieved using the
>> variables or text properties `line-prefix' and `wrap-prefix', but what
>> is a stretch-glyph?
>
> That's the empty space generated by the display engine when you use
> :width, :relative-width, or :align-to display specs, see the node
> "Specified Space" in the ELisp manual.  (I will clarify the text in
> the manual in this regard.)  But the variables you mention are
> supposed to have constant values, so you cannot put there a Lisp
> expression that needs to be evaluated.  Therefore, I think you will
> only be able to use them in your situation if you manually set them to
> the amount of space derived from the logical indentation, or invoke
> some hook that does that when the file is visited 

I use the following (added to a major-mode defun) to achieve the visual
effect described:

(defun srb-wrap-and-indent ()
  "Use word wrapping on long lines and indent with a wrap prefix.
The amount of indentation is given by user option `srb-indent-to-here'."
  (set (make-local-variable 'word-wrap) t)
  (set (make-local-variable 'wrap-prefix) (make-string srb-indent-to-here 32))
  (unless (member '(continuation) fringe-indicator-alist)
    (push '(continuation) fringe-indicator-alist)))

>                                                   (assuming you never
> want to change the indentation during editing).

A while ago there was a thread about implementing a minor mode to get
visual indentation with wrap-prefix using fill-context-prefix, in which
I proposed an adaptation of the above; see
<http://permalink.gmane.org/gmane.emacs.devel/125268>.  AFAIK there was
no followup to my proposal.

Steve Berman



  reply	other threads:[~2011-11-25 12:38 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-11-25  9:34 Indentation and visual-line-mode Tassilo Horn
2011-11-25 11:52 ` Eli Zaretskii
2011-11-25 12:38   ` Stephen Berman [this message]
2011-11-25 13:54     ` Tassilo Horn
2011-11-25 14:52       ` Stefan Monnier
2011-11-25 14:58         ` Lennart Borgman
2011-11-25 15:15         ` Tassilo Horn
2011-11-25 13:49 ` Lennart Borgman
2011-11-25 14:36   ` Tassilo Horn
2011-11-25 14:47     ` Lennart Borgman
2011-11-25 15:37       ` Juanma Barranquero
2011-11-25 15:46         ` Lennart Borgman
2011-11-25 14:00 ` Stefan Monnier

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

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=87bos0l6ml.fsf@escher.home \
    --to=stephen.berman@gmx.net \
    --cc=eliz@gnu.org \
    --cc=emacs-devel@gnu.org \
    --cc=tassilo@member.fsf.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 external index

	https://git.savannah.gnu.org/cgit/emacs.git
	https://git.savannah.gnu.org/cgit/emacs/org-mode.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.