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Re: line/wrap-prefix patch
From: |
Stephen Berman |
Subject: |
Re: line/wrap-prefix patch |
Date: |
Sat, 05 Jul 2008 23:30:50 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux) |
On Sat, 05 Jul 2008 09:52:17 +0900 Miles Bader <address@hidden> wrote:
> Stephen Berman <address@hidden> writes:
>>> To get varying prefixes, you can use the `wrap-prefix' text property.
>>
>> Yes, I see this when I evaluate e.g. (put-text-property (point) (1+
>> (point)) 'wrap-prefix " ") with the cursor on the first character of
>> a wrapped word. Is this the right way to use this text property?
>
> You can put the property over the entire region of text that the
> wrap-prefix applies to; there's no need to know which words will
> actually get wrapped.
Ah, thank you, that didn't occur to me.
[...]
> The "right" indendation depends only on the text following the
> preceding _hard_ line-start, i.e, the preceding "non-wrap prefix".
[...]
> The tricky part is getting the wrap-prefix " " by examining the
> current non-wrap prefix, " - " in this case. Currently there's no
> way of having the display engine do it, so one could alternatively have
> a font-lock-like mechanism that turned hard paragraph prefixes into
> wrap-prefix text properties.
On Fri, 04 Jul 2008 17:25:15 -0400 Stefan Monnier
<address@hidden> wrote:
> I'd expect it to be a job for jit-lock.
Thanks to both of you for these suggestions. The following seems to
DTRT, at least according to my minimal testing; no doubt it could be
improved:
(defun srb-adaptive-indent (beg end)
"Indent the region between BEG and END with adaptive filling."
(goto-char beg)
(let ((lbp (line-beginning-position))
(lep (line-end-position)))
(put-text-property lbp lep 'wrap-prefix (fill-context-prefix lbp lep)))
(while (re-search-forward "\n" (point-max) t)
(forward-char)
(let ((lbp (line-beginning-position))
(lep (line-end-position)))
(put-text-property lbp lep 'wrap-prefix (fill-context-prefix lbp lep)))))
(define-minor-mode srb-adaptive-wrap-mode
"Wrap the buffer text with adaptive filling."
:lighter ""
(save-excursion
(save-restriction
(widen)
(let ((buffer-undo-list t)
(inhibit-read-only t)
(mod (buffer-modified-p)))
(if srb-adaptive-wrap-mode
(progn
(setq word-wrap t)
(unless (member '(continuation) fringe-indicator-alist)
(push '(continuation) fringe-indicator-alist))
(jit-lock-register 'srb-adaptive-indent))
(jit-lock-unregister 'srb-adaptive-indent)
(remove-text-properties (point-min) (point-max) '(wrap-prefix pref))
(setq fringe-indicator-alist
(delete '(continuation) fringe-indicator-alist))
(setq word-wrap nil))
(set-buffer-modified-p mod)))))
Miles continued:
>> *********
>> I was really hoping you would respond to the display problem at
>> window-start. I find it very dissatisfying to regard this as a
>> "misfeature" of Emacs redisplay and leave it that, as RMS seemed to
>> conclude was the only course to take.
>
> I haven't been able the reproduce it so far, so I need to try to do so
> more thoroughly. I'll try to do so this weekend.
Do you use a proportional font? I always used a monospaced font (mostly
Dejavu Sans Mono) and with that the recipe I gave is reliable. But I
just tried it with a proportional font (Dejavu Sans), and to my surprise
my recipe failed, i.e. the indentation remained visible at window-start.
No idea why fixed and proportional fonts differ here.
Steve Berman