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From: Nicolas Goaziou <mail@nicolasgoaziou.fr>
To: Eli Zaretskii <eliz@gnu.org>
Cc: shingo.fg8@gmail.com, 48148-done@debbugs.gnu.org
Subject: bug#48148: 27.2; ox-ascii breaks TITLE line wrongly when 2 width char is used
Date: Sun, 02 May 2021 17:56:04 +0200	[thread overview]
Message-ID: <87eeep86zv.fsf@nicolasgoaziou.fr> (raw)
In-Reply-To: <83tunl714h.fsf@gnu.org> (Eli Zaretskii's message of "Sun, 02 May 2021 15:48:14 +0300")

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Nicolas Goaziou <mail@nicolasgoaziou.fr>
>> Cc: shingo.fg8@gmail.com,  48148@debbugs.gnu.org
>> Date: Sun, 02 May 2021 14:18:24 +0200
>> 
>> My problem is that I have some string, _which is not displayed anywhere_
>> yet. I need to obtain its real width along with the width of a single
>> character in order to compute the length argument in `make-string'.
>
> The width of any text on display is meaningless unless you also tell
> in what window will it be displayed.  That's because some of the
> factors that affect the display width depend on the window and the
> buffer shown by that window.

I understand. More than the width of the text, I'm interested in the
ratio between the width of the text and the width of an underline
character (assuming monospace).

> So assuming the string you have will eventually be displayed in some
> window -- and most strings in Emacs are of that kind -- you should use
> that window up front.  Otherwise, the value you get from other methods
> can only be an approximation, which will sometimes be close, and
> sometimes quite far from the truth.

The string may not be displayed at all. Since it is the output of an
export process, it could, e.g., be written to a file.

I applied Shingo Tanaka's suggestion using `string-width', which is the
best we can do considering our requirements.

Thank you for your answer, and to Shingo Tanaka for the report an the
patch.

Regards,





  reply	other threads:[~2021-05-02 15:57 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <87h7jm2es2.wl-shingo.fg8@gmail.com>
2021-05-02  7:03 ` Eli Zaretskii
2021-05-02  8:23   ` Nicolas Goaziou
2021-05-02  9:11     ` Eli Zaretskii
2021-05-02 11:33       ` Shingo Tanaka
2021-05-02 12:43         ` Eli Zaretskii
2021-05-02 12:18       ` Nicolas Goaziou
2021-05-02 12:48         ` Eli Zaretskii
2021-05-02 15:56           ` Nicolas Goaziou [this message]
2021-05-02 16:11             ` Eli Zaretskii

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