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Subject: bug#48149: 27.2; Wrong underline width when the line char has a width of 2
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Date: Sun, 02 May 2021 10:12:43 +0900
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From: Shingo Tanaka <shingo.fg8@HIDDEN>
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--Multipart_Sun_May__2_10:12:43_2021-1
Content-Type: text/plain; charset=ISO-2022-JP
Hi,
When exporting org-mode document to plain text (either ascii/unicode/utf-8)
with `org-export-dispatch', Emacs inserts lines under headlines, inline
tasks, table rows and titles of the document, TOC, list of listings, list of
tables and footnotes. The problem is it inserts too long (double width) line
when the line character has a width of 2.
Those lines are made of 3 types of characters below (in ox-ascii.el):
1) org-ascii-underline
2) (if (eq (plist-get info :ascii-charset) 'utf-8) ?$B(!(B ?_)
3) (if utf8p ?$B(,(B ?_)
In case of 1), it correctly takes account of the case in which the character
has a width of 2 in `org-ascii--build-title', by dividing the line width by
`(char-width under-char)' (line 700-701), maybe because the character is user
configurable and its width in unknown. However, in case of 2) and
3), maybe because the characters is embedded in the code, it looks like only
considering the character always has a width of 1. But the reality is
character ?$B(!(B or ?$B(,(B can have a width of 2 in the screen displayed with some
fonts (ex. "Noto Sans Mono CJK JP"), and in that case the line width gets
doubled of the expected width.
Attached one is a potential patch. The basic concepts are:
a) Do the same in case of 2) and 3) as in case of 1)
(dividing the line width by `(char-width under-char)',
assuming `char-width-table' is correctly set)
b) Prefer the longer line width if the width is odd, even in case of 1)
(adding `(1- (char-width under-char))' to dividend,
just because it should be more beautiful ;-) )
Regards,
---
Shingo Tanaka
--Multipart_Sun_May__2_10:12:43_2021-1
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Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Shingo Tanaka <shingo.fg8@HIDDEN> Subject: bug#48149: Acknowledgement (27.2; Wrong underline width when the line char has a width of 2) Message-ID: <handler.48149.B.161991797230608.ack <at> debbugs.gnu.org> References: <87fsz62b1w.wl-shingo.fg8@HIDDEN> X-Gnu-PR-Message: ack 48149 X-Gnu-PR-Package: emacs Reply-To: 48149 <at> debbugs.gnu.org Date: Sun, 02 May 2021 01:13:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-gnu-emacs@HIDDEN If you wish to submit further information on this problem, please send it to 48149 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 48149: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D48149 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: bug#48149: 27.2; Wrong underline width when the line char has a width of 2
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In-Reply-To: <87fsz62b1w.wl-shingo.fg8@HIDDEN> (message from Shingo Tanaka
on Sun, 02 May 2021 10:12:43 +0900)
References: <87fsz62b1w.wl-shingo.fg8@HIDDEN>
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> Date: Sun, 02 May 2021 10:12:43 +0900
> From: Shingo Tanaka <shingo.fg8@HIDDEN>
>
> When exporting org-mode document to plain text (either ascii/unicode/utf-8)
> with `org-export-dispatch', Emacs inserts lines under headlines, inline
> tasks, table rows and titles of the document, TOC, list of listings, list of
> tables and footnotes. The problem is it inserts too long (double width) line
> when the line character has a width of 2.
>
> Those lines are made of 3 types of characters below (in ox-ascii.el):
> 1) org-ascii-underline
> 2) (if (eq (plist-get info :ascii-charset) 'utf-8) ?$B(!(B ?_)
> 3) (if utf8p ?$B(,(B ?_)
>
> In case of 1), it correctly takes account of the case in which the character
> has a width of 2 in `org-ascii--build-title', by dividing the line width by
> `(char-width under-char)' (line 700-701), maybe because the character is user
> configurable and its width in unknown. However, in case of 2) and
> 3), maybe because the characters is embedded in the code, it looks like only
> considering the character always has a width of 1. But the reality is
> character ?$B(!(B or ?$B(,(B can have a width of 2 in the screen displayed with some
> fonts (ex. "Noto Sans Mono CJK JP"), and in that case the line width gets
> doubled of the expected width.
>
> Attached one is a potential patch. The basic concepts are:
>
> a) Do the same in case of 2) and 3) as in case of 1)
> (dividing the line width by `(char-width under-char)',
> assuming `char-width-table' is correctly set)
>
> b) Prefer the longer line width if the width is odd, even in case of 1)
> (adding `(1- (char-width under-char))' to dividend,
> just because it should be more beautiful ;-) )
You reported a similar bug already, and I replied there that TRT in
these cases is to use window-text-pixel-size, which will automatically
account for the actual width on display of any characters and any
fonts specified for displaying them. char-width is an approximation,
and is accurate only on TTY frames.
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Subject: bug#48149: 27.2; Wrong underline width when the line char has a width of 2
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Eli Zaretskii <eliz@HIDDEN> writes:
>> Date: Sun, 02 May 2021 10:12:43 +0900
>> From: Shingo Tanaka <shingo.fg8@HIDDEN>
>>
>> When exporting org-mode document to plain text (either ascii/unicode/utf-8)
>> with `org-export-dispatch', Emacs inserts lines under headlines, inline
>> tasks, table rows and titles of the document, TOC, list of listings, list of
>> tables and footnotes. The problem is it inserts too long (double width) line
>> when the line character has a width of 2.
>>
>> Those lines are made of 3 types of characters below (in ox-ascii.el):
>> 1) org-ascii-underline
>> 2) (if (eq (plist-get info :ascii-charset) 'utf-8) ?─ ?_)
>> 3) (if utf8p ?━ ?_)
>>
>> In case of 1), it correctly takes account of the case in which the character
>> has a width of 2 in `org-ascii--build-title', by dividing the line width by
>> `(char-width under-char)' (line 700-701), maybe because the character is user
>> configurable and its width in unknown. However, in case of 2) and
>> 3), maybe because the characters is embedded in the code, it looks like only
>> considering the character always has a width of 1. But the reality is
>> character ?─ or ?━ can have a width of 2 in the screen displayed with some
>> fonts (ex. "Noto Sans Mono CJK JP"), and in that case the line width gets
>> doubled of the expected width.
>>
>> Attached one is a potential patch. The basic concepts are:
>>
>> a) Do the same in case of 2) and 3) as in case of 1)
>> (dividing the line width by `(char-width under-char)',
>> assuming `char-width-table' is correctly set)
>>
>> b) Prefer the longer line width if the width is odd, even in case of 1)
>> (adding `(1- (char-width under-char))' to dividend,
>> just because it should be more beautiful ;-) )
>
> You reported a similar bug already, and I replied there that TRT in
> these cases is to use window-text-pixel-size, which will automatically
> account for the actual width on display of any characters and any
> fonts specified for displaying them. char-width is an approximation,
> and is accurate only on TTY frames.
Isn't the primary result of org-export a plain (UTF-8) text file,
instead of an emacs buffer to be displayed in a GUI or TTY frame?
If so, maybe the criterion for correctness should be that "cat
filename.txt" looks as expected in a terminal, even if opening that file
in Emacs shows lines of different lengths due to variable-pitch faces
etc.
X-Loop: help-debbugs@HIDDEN
Subject: bug#48149: 27.2; Wrong underline width when the line char has a width of 2
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From: Eli Zaretskii <eliz@HIDDEN>
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Sun, 02 May 2021 10:36:14 +0200)
References: <87fsz62b1w.wl-shingo.fg8@HIDDEN>
<837dkh8uzi.fsf__22492.4155323365$1619940077$gmane$org@HIDDEN>
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> From: Rudolf Schlatte <rudi@HIDDEN>
> Date: Sun, 02 May 2021 10:36:14 +0200
>
> > You reported a similar bug already, and I replied there that TRT in
> > these cases is to use window-text-pixel-size, which will automatically
> > account for the actual width on display of any characters and any
> > fonts specified for displaying them. char-width is an approximation,
> > and is accurate only on TTY frames.
>
> Isn't the primary result of org-export a plain (UTF-8) text file,
> instead of an emacs buffer to be displayed in a GUI or TTY frame?
>
> If so, maybe the criterion for correctness should be that "cat
> filename.txt" looks as expected in a terminal, even if opening that file
> in Emacs shows lines of different lengths due to variable-pitch faces
> etc.
If the result is supposed to be displayed only on text-mode terminals,
then indeed string-width is the way to go (assuming that the terminal
in question will use fonts that will not break the alignment).
However, if the result is supposed to be displayed by a GUI program
such as Emacs, then string-width will not produce accurate results.
Maybe this is not important in this kind of export, in which case I
apologize for the noise.
X-Loop: help-debbugs@HIDDEN
Subject: bug#48149: 27.2; Wrong underline width when the line char has a width of 2
Resent-From: Nicolas Goaziou <mail@HIDDEN>
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Date: Sun, 02 May 2021 18:08:50 +0200
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Hello,
Shingo Tanaka <shingo.fg8@HIDDEN> writes:
> When exporting org-mode document to plain text (either ascii/unicode/utf-=
8)
> with `org-export-dispatch', Emacs inserts lines under headlines, inline
> tasks, table rows and titles of the document, TOC, list of listings, list=
of
> tables and footnotes. The problem is it inserts too long (double width) =
line
> when the line character has a width of 2.
>
> Those lines are made of 3 types of characters below (in ox-ascii.el):
> 1) org-ascii-underline
> 2) (if (eq (plist-get info :ascii-charset) 'utf-8) ?=E2=94=80 ?_)
> 3) (if utf8p ?=E2=94=81 ?_)
>
> In case of 1), it correctly takes account of the case in which the charac=
ter
> has a width of 2 in `org-ascii--build-title', by dividing the line width =
by
> `(char-width under-char)' (line 700-701), maybe because the character is =
user
> configurable and its width in unknown. However, in case of 2) and
> 3), maybe because the characters is embedded in the code, it looks like o=
nly
> considering the character always has a width of 1. But the reality is
> character ?=E2=94=80 or ?=E2=94=81 can have a width of 2 in the screen di=
splayed with some
> fonts (ex. "Noto Sans Mono CJK JP"), and in that case the line width gets
> doubled of the expected width.
>
> Attached one is a potential patch. The basic concepts are:
>
> a) Do the same in case of 2) and 3) as in case of 1)
> (dividing the line width by `(char-width under-char)',
> assuming `char-width-table' is correctly set)
>=20=20=20=20=20
> b) Prefer the longer line width if the width is odd, even in case of 1)
> (adding `(1- (char-width under-char))' to dividend,
> just because it should be more beautiful ;-) )
Thank you. This looks good. I cannot apply it on "maint" branch,
however. Also, a proper commit message would be nice. Could you send an
updated patch?
Moreover, have you signed FSF papers already? This is above limit for
tiny changes.
Regards,
--=20
Nicolas Goaziou
X-Loop: help-debbugs@HIDDEN
Subject: bug#48149: 27.2; Wrong underline width when the line char has a width of 2
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> From: Nicolas Goaziou <mail@HIDDEN>
> Date: Sun, 02 May 2021 18:08:50 +0200
> Cc: 48149 <at> debbugs.gnu.org
>
> > In case of 1), it correctly takes account of the case in which the character
> > has a width of 2 in `org-ascii--build-title', by dividing the line width by
> > `(char-width under-char)' (line 700-701), maybe because the character is user
> > configurable and its width in unknown. However, in case of 2) and
> > 3), maybe because the characters is embedded in the code, it looks like only
> > considering the character always has a width of 1. But the reality is
> > character ?─ or ?━ can have a width of 2 in the screen displayed with some
> > fonts (ex. "Noto Sans Mono CJK JP"), and in that case the line width gets
> > doubled of the expected width.
> >
> > Attached one is a potential patch. The basic concepts are:
> >
> > a) Do the same in case of 2) and 3) as in case of 1)
> > (dividing the line width by `(char-width under-char)',
> > assuming `char-width-table' is correctly set)
> >
> > b) Prefer the longer line width if the width is odd, even in case of 1)
> > (adding `(1- (char-width under-char))' to dividend,
> > just because it should be more beautiful ;-) )
>
> Thank you. This looks good. I cannot apply it on "maint" branch,
> however. Also, a proper commit message would be nice. Could you send an
> updated patch?
Please note that using char-width cannot solve the problem of a
character whose width depends on the font, because char-width is
oblivious to fonts, it only knows about the character's codepoint.
X-Loop: help-debbugs@HIDDEN
Subject: bug#48149: 27.2; Wrong underline width when the line char has a width of 2
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Sun, 09 May 2021 06:57:46 -0700 (PDT)
Date: Sun, 09 May 2021 22:57:43 +0900
Message-ID: <87eeegc8mg.wl-shingo.fg8@HIDDEN>
From: Shingo Tanaka <shingo.fg8@HIDDEN>
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--Multipart_Sun_May__9_22:57:41_2021-1
Content-Type: text/plain; charset=ISO-2022-JP
Hi,
> Please note that using char-width cannot solve the problem of a
> character whose width depends on the font, because char-width is
> oblivious to fonts, it only knows about the character's codepoint.
I updated my patch proposal as attached to use window-text-pixel-size based
on Eli's advice. Could you check it to see if it meets the expectation? It
works good in my environment with some fonts of different char widths.
Here are some comments:
- New internal functions org-ascii--make-string and org-ascii--pixel-width
are introduced just to improve code readability of this modification
- Line width is decided by org-ascii--make-string, which is a pixel width
based make-string
- org-ascii--make-string uses org-ascii--pixel-width, which returns
actual pixel width of characters and strings by using
window-text-pixel-size with frame default font
- Line justification is also modified to be a pixel width basis
Since this is not a simple modification, I think we might need further
improvement, so any feedback is appreciated. Especially, we could do better
for table alignment, as that is not very easy because the pixel width of line
character and that of space character is not always the same.
Anyway, I appreciate it if you can give it a try. I am doing FSF signing
process in parallel just in case.
---
Shingo Tanaka
On Mon, 03 May 2021 01:23:02 +0900,
Eli Zaretskii wrote:
>
> > From: Nicolas Goaziou <mail@HIDDEN>
> > Date: Sun, 02 May 2021 18:08:50 +0200
> > Cc: 48149 <at> debbugs.gnu.org
> >
> > > In case of 1), it correctly takes account of the case in which the character
> > > has a width of 2 in `org-ascii--build-title', by dividing the line width by
> > > `(char-width under-char)' (line 700-701), maybe because the character is user
> > > configurable and its width in unknown. However, in case of 2) and
> > > 3), maybe because the characters is embedded in the code, it looks like only
> > > considering the character always has a width of 1. But the reality is
> > > character ?$B(!(B or ?$B(,(B can have a width of 2 in the screen displayed with some
> > > fonts (ex. "Noto Sans Mono CJK JP"), and in that case the line width gets
> > > doubled of the expected width.
> > >
> > > Attached one is a potential patch. The basic concepts are:
> > >
> > > a) Do the same in case of 2) and 3) as in case of 1)
> > > (dividing the line width by `(char-width under-char)',
> > > assuming `char-width-table' is correctly set)
> > >
> > > b) Prefer the longer line width if the width is odd, even in case of 1)
> > > (adding `(1- (char-width under-char))' to dividend,
> > > just because it should be more beautiful ;-) )
> >
> > Thank you. This looks good. I cannot apply it on "maint" branch,
> > however. Also, a proper commit message would be nice. Could you send an
> > updated patch?
>
> Please note that using char-width cannot solve the problem of a
> character whose width depends on the font, because char-width is
> oblivious to fonts, it only knows about the character's codepoint.
--Multipart_Sun_May__9_22:57:41_2021-1
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Subject: bug#48149: 27.2; Wrong underline width when the line char has a width of 2
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From: Shingo Tanaka <shingo.fg8@HIDDEN>
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--Multipart_Sun_May__9_22:57:41_2021-1
Content-Type: text/plain; charset=ISO-2022-JP
Hi,
> Please note that using char-width cannot solve the problem of a
> character whose width depends on the font, because char-width is
> oblivious to fonts, it only knows about the character's codepoint.
I updated my patch proposal as attached to use window-text-pixel-size based
on Eli's advice. Could you check it to see if it meets the expectation? It
works good in my environment with some fonts of different char widths.
Here are some comments:
- New internal functions org-ascii--make-string and org-ascii--pixel-width
are introduced just to improve code readability of this modification
- Line width is decided by org-ascii--make-string, which is a pixel width
based make-string
- org-ascii--make-string uses org-ascii--pixel-width, which returns
actual pixel width of characters and strings by using
window-text-pixel-size with frame default font
- Line justification is also modified to be a pixel width basis
Since this is not a simple modification, I think we might need further
improvement, so any feedback is appreciated. Especially, we could do better
for table alignment, as that is not very easy because the pixel width of line
character and that of space character is not always the same.
Anyway, I appreciate it if you can give it a try. I am doing FSF signing
process in parallel just in case.
---
Shingo Tanaka
On Mon, 03 May 2021 01:23:02 +0900,
Eli Zaretskii wrote:
>
> > From: Nicolas Goaziou <mail@HIDDEN>
> > Date: Sun, 02 May 2021 18:08:50 +0200
> > Cc: 48149 <at> debbugs.gnu.org
> >
> > > In case of 1), it correctly takes account of the case in which the character
> > > has a width of 2 in `org-ascii--build-title', by dividing the line width by
> > > `(char-width under-char)' (line 700-701), maybe because the character is user
> > > configurable and its width in unknown. However, in case of 2) and
> > > 3), maybe because the characters is embedded in the code, it looks like only
> > > considering the character always has a width of 1. But the reality is
> > > character ?$B(!(B or ?$B(,(B can have a width of 2 in the screen displayed with some
> > > fonts (ex. "Noto Sans Mono CJK JP"), and in that case the line width gets
> > > doubled of the expected width.
> > >
> > > Attached one is a potential patch. The basic concepts are:
> > >
> > > a) Do the same in case of 2) and 3) as in case of 1)
> > > (dividing the line width by `(char-width under-char)',
> > > assuming `char-width-table' is correctly set)
> > >
> > > b) Prefer the longer line width if the width is odd, even in case of 1)
> > > (adding `(1- (char-width under-char))' to dividend,
> > > just because it should be more beautiful ;-) )
> >
> > Thank you. This looks good. I cannot apply it on "maint" branch,
> > however. Also, a proper commit message would be nice. Could you send an
> > updated patch?
>
> Please note that using char-width cannot solve the problem of a
> character whose width depends on the font, because char-width is
> oblivious to fonts, it only knows about the character's codepoint.
--Multipart_Sun_May__9_22:57:41_2021-1
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