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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,

next prev parent 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 ` bug#48148: 27.2; ox-ascii breaks TITLE line wrongly when 2 width char is used 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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