From: Yuan Fu <casouri@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: Stefan Monnier <monnier@iro.umontreal.ca>, emacs-devel@gnu.org
Subject: Re: Alternative to current-column that counts from visual line beginning
Date: Tue, 29 Dec 2020 16:05:06 -0500 [thread overview]
Message-ID: <825A2F57-1C56-4B4D-B16B-2DD2AC3734D5@gmail.com> (raw)
In-Reply-To: <9CF22BD8-B889-4859-9119-A054B1084840@gnu.org>
> On Dec 29, 2020, at 1:21 AM, Eli Zaretskii <eliz@gnu.org> wrote:
>
> On December 29, 2020 7:01:16 AM GMT+02:00, Yuan Fu <casouri@gmail.com> wrote:
>>
>>
>>> On Dec 28, 2020, at 9:40 PM, Stefan Monnier
>> <monnier@iro.umontreal.ca> wrote:
>>>
>>>> to get the column number counting from the visual line beginning.
>> Is
>>>> there a function that does what I want? If not, maybe we should add
>>>> one, or add an argument to current-column.
>>>
>>> `posn-at-point`?
>>>
>>
>> That works, albeit a bit convoluted comparing to current-column and
>> only works when point is visible. Another less legit point is that
>> posn-at-point is a bit far-fetched semantically: for me it is more
>> about GUI pixel positions than text-based column and line positions.
>> All things considered, I still prefer a dedicated function or an
>> additional argument to current-column.
>>
>> Yuan
>
> The concept of "visual line" of some buffer position only makes sense in the context of displaying the buffer in some window. That's because window dimensions and other window-specific aspects, such as faces and overlays, have direct and prominent effect on how physical lines are divided into visual lines.
>
> Therefore, I don't think I understand how can a function exist that reports the "visual column" of a buffer position without telling it the window in which to display that buffer. Could you perhaps outline the algorithm for such a function? Perhaps there is some misunderstanding.
I see your point. I use vertical-motion, which takes a window as argument (and defaults to the current window).
(save-excursion
(let ((col (current-column)))
;; Go to visual line beginning.
(vertical-motion 0)
(- col (current-column))))
Yuan
prev parent reply other threads:[~2020-12-29 21:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-29 2:19 Alternative to current-column that counts from visual line beginning Yuan Fu
2020-12-29 2:40 ` Stefan Monnier
2020-12-29 5:01 ` Yuan Fu
2020-12-29 6:21 ` Eli Zaretskii
2020-12-29 21:05 ` Yuan Fu [this message]
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