GNU bug report logs - #24972
26.0.50; Multibyte characters are misaligned in ibuffer

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Liu Hui <liuhui1610 <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.0.50; Multibyte characters are misaligned in ibuffer
Date: Sun, 20 Nov 2016 20:32:06 +0800

[Message part 1 (text/plain, inline)]

Hello,

As shown in the screenshot attached, multibyte characters (the second 
line) are misaligned in ibuffer. The problem seems at least relevant to 
the function `ibuffer-compile-format', which uses `length' rather than 
`string-width' for characters.


In GNU Emacs 26.0.50.2 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2016-10-26 built on lcy01-25
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:	Ubuntu 16.04.1 LTS

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Updating buffer list...
Formats have changed, recompiling...done
Updating buffer list...done
Commands: m, u, t, RET, g, k, S, D, Q; q to quit; h for help

Configured using:
 'configure --build=x86_64-linux-gnu --prefix=/usr
 '--includedir=${prefix}/include' '--mandir=${prefix}/share/man'
 '--infodir=${prefix}/share/info' --sysconfdir=/etc --localstatedir=/var
 --disable-silent-rules '--libdir=${prefix}/lib/x86_64-linux-gnu'
 '--libexecdir=${prefix}/lib/x86_64-linux-gnu' --disable-maintainer-mode
 --disable-dependency-tracking --prefix=/usr --sharedstatedir=/var/lib
 --program-suffix=-snapshot --with-modules=yes --with-x=yes
 --with-x-toolkit=gtk3 --with-xwidgets=yes 'CFLAGS=-g -O2
 -fstack-protector-strong -Wformat -Werror=format-security'
 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2'
 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
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Important settings:
  value of $LANG: zh_CN.UTF-8
  value of $XMODIFIERS: @im=fcitx
  locale-coding-system: utf-8-unix

Major mode: IBuffer

Minor modes in effect:
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  mouse-wheel-mode: t
  tool-bar-mode: t
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Memory information:
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 (intervals 56 401 8)
 (buffers 976 14)
 (heap 1024 32825 1228))

[bug.png (image/png, attachment)]

Message #8 received at 24972 <at> debbugs.gnu.org (full text, mbox):

From: Mark Oteiza <mvoteiza <at> udel.edu>
To: Liu Hui <liuhui1610 <at> gmail.com>
Cc: 24972 <at> debbugs.gnu.org
Subject: Re: bug#24972: 26.0.50; Multibyte characters are misaligned in ibuffer
Date: Sun, 20 Nov 2016 13:58:16 -0500

Liu Hui <liuhui1610 <at> gmail.com> writes:
> As shown in the screenshot attached, multibyte characters (the second
> line) are misaligned in ibuffer. The problem seems at least relevant
> to the function `ibuffer-compile-format', which uses `length' rather
> than `string-width' for characters.

Indeed, changing to string-width improves it. ibuffer should probably
also be using display properties to align the columns, but that's
another issue.

Committed in 7e2a8b1. Thanks for reporting

Message #11 received at 24972 <at> debbugs.gnu.org (full text, mbox):

From: Liu Hui <liuhui1610 <at> gmail.com>
To: Mark Oteiza <mvoteiza <at> udel.edu>
Cc: 24972 <at> debbugs.gnu.org
Subject: Re: bug#24972: 26.0.50; Multibyte characters are misaligned in ibuffer
Date: Mon, 21 Nov 2016 14:00:14 +0800

在 2016年11月21日 02:58, Mark Oteiza 写道:
>
> Liu Hui <liuhui1610 <at> gmail.com> writes:
>> As shown in the screenshot attached, multibyte characters (the second
>> line) are misaligned in ibuffer. The problem seems at least relevant
>> to the function `ibuffer-compile-format', which uses `length' rather
>> than `string-width' for characters.
>
> Indeed, changing to string-width improves it. ibuffer should probably
> also be using display properties to align the columns, but that's
> another issue.
>
> Committed in 7e2a8b1. Thanks for reporting
>

Thank you, but I find it does not work when the multibyte string is 
long. For example, if the string-width of buffer name, e.g. 
"一个很长很长的文件名", exceeds the default width of ibuffer column, M-x ibuffer 
will fail and issue an error.

According to the backtrace, it is because `ibuffer-compile-format' calls 
`ibuffer-compile-make-substring-form'/`ibuffer-compile-make-eliding-form', 
which use `substring' to truncate the multibyte string. A similar issue 
was reported in https://github.com/emacs-helm/helm/issues/170. Probably 
replacing `substring' solves the problem.

Message #14 received at 24972 <at> debbugs.gnu.org (full text, mbox):

From: Mark Oteiza <mvoteiza <at> udel.edu>
To: Liu Hui <liuhui1610 <at> gmail.com>
Cc: 24972 <at> debbugs.gnu.org
Subject: Re: bug#24972: 26.0.50; Multibyte characters are misaligned in ibuffer
Date: Mon, 21 Nov 2016 04:35:45 -0500

On 21/11/16 at 02:00pm, Liu Hui wrote:
> 在 2016年11月21日 02:58, Mark Oteiza 写道:
> > Liu Hui <liuhui1610 <at> gmail.com> writes:
> > > As shown in the screenshot attached, multibyte characters (the second
> > > line) are misaligned in ibuffer. The problem seems at least relevant
> > > to the function `ibuffer-compile-format', which uses `length' rather
> > > than `string-width' for characters.
> > 
> > Indeed, changing to string-width improves it. ibuffer should probably
> > also be using display properties to align the columns, but that's
> > another issue.
> > 
> > Committed in 7e2a8b1. Thanks for reporting
> 
> Thank you, but I find it does not work when the multibyte string is long.
> For example, if the string-width of buffer name, e.g.
> "一个很长很长的文件名", exceeds the default width of ibuffer column, M-x
> ibuffer will fail and issue an error.
> 
> According to the backtrace, it is because `ibuffer-compile-format' calls
> `ibuffer-compile-make-substring-form'/`ibuffer-compile-make-eliding-form',
> which use `substring' to truncate the multibyte string. A similar issue was
> reported in https://github.com/emacs-helm/helm/issues/170. Probably
> replacing `substring' solves the problem.

Ah, thanks. I pushed another change that fixes the error.  Still, if the
name is a particular mix of half- and full-width though (e.g.
"aーーーーーー"), the next column(s) might be off by one.

Message #17 received at 24972 <at> debbugs.gnu.org (full text, mbox):

From: Liu Hui <liuhui1610 <at> gmail.com>
To: Mark Oteiza <mvoteiza <at> udel.edu>
Cc: 24972 <at> debbugs.gnu.org
Subject: Re: bug#24972: 26.0.50; Multibyte characters are misaligned in ibuffer
Date: Tue, 22 Nov 2016 11:51:50 +0800

在 2016年11月21日 17:35, Mark Oteiza 写道:
> On 21/11/16 at 02:00pm, Liu Hui wrote:
>> 在 2016年11月21日 02:58, Mark Oteiza 写道:
>>> Liu Hui <liuhui1610 <at> gmail.com> writes:
>>>> As shown in the screenshot attached, multibyte characters (the second
>>>> line) are misaligned in ibuffer. The problem seems at least relevant
>>>> to the function `ibuffer-compile-format', which uses `length' rather
>>>> than `string-width' for characters.
>>>
>>> Indeed, changing to string-width improves it. ibuffer should probably
>>> also be using display properties to align the columns, but that's
>>> another issue.
>>>
>>> Committed in 7e2a8b1. Thanks for reporting
>>
>> Thank you, but I find it does not work when the multibyte string is long.
>> For example, if the string-width of buffer name, e.g.
>> "一个很长很长的文件名", exceeds the default width of ibuffer column, M-x
>> ibuffer will fail and issue an error.
>>
>> According to the backtrace, it is because `ibuffer-compile-format' calls
>> `ibuffer-compile-make-substring-form'/`ibuffer-compile-make-eliding-form',
>> which use `substring' to truncate the multibyte string. A similar issue was
>> reported in https://github.com/emacs-helm/helm/issues/170. Probably
>> replacing `substring' solves the problem.
>
> Ah, thanks. I pushed another change that fixes the error.  Still, if the
> name is a particular mix of half- and full-width though (e.g.
> "aーーーーーー"), the next column(s) might be off by one.
>

Thank you, but the trailing "..." is missing for long buffer names, no 
matter whether they contain multibyte characters. For example, 
"01234567890123456789" becomes "012345678901234567". The normal result 
should be "012345678901234...".

Message #20 received at 24972 <at> debbugs.gnu.org (full text, mbox):

From: Mark Oteiza <mvoteiza <at> udel.edu>
To: Liu Hui <liuhui1610 <at> gmail.com>
Cc: 24972 <at> debbugs.gnu.org
Subject: Re: bug#24972: 26.0.50; Multibyte characters are misaligned in ibuffer
Date: Tue, 22 Nov 2016 00:12:16 -0500

On 22/11/16 at 11:51am, Liu Hui wrote:
> Thank you, but the trailing "..." is missing for long buffer names, no
> matter whether they contain multibyte characters. For example,
> "01234567890123456789" becomes "012345678901234567". The normal result
> should be "012345678901234...".

Would you try the following?

diff --git a/lisp/ibuffer.el b/lisp/ibuffer.el
index faadb67..c550b7d 100644
--- a/lisp/ibuffer.el
+++ b/lisp/ibuffer.el
@@ -1559,16 +1559,17 @@ ibuffer-compile-make-eliding-form
 		  `(concat ,ellipsis
 			   (substring ,strvar
 				      (string-width ibuffer-eliding-string)))
-		`(truncate-string-to-width
-		  ,strvar strlen nil nil
-		  ,ellipsis))
+		`(concat
+		  (truncate-string-to-width
+                   ,strvar (- strlen (string-width ,ellipsis)) nil ?.)
+                  ,ellipsis))
 	   ,strvar)
       strvar)))
 
 (defun ibuffer-compile-make-substring-form (strvar maxvar from-end-p)
   (if from-end-p
-      `(truncate-string-to-width str (string-width str) (- strlen ,maxvar))
-    `(truncate-string-to-width ,strvar ,maxvar)))
+      `(truncate-string-to-width str (string-width str) (- strlen ,maxvar) nil ?\s)
+    `(truncate-string-to-width ,strvar ,maxvar nil ?\s)))
 
 (defun ibuffer-compile-make-format-form (strvar widthform alignment)
   (let* ((left `(make-string tmp2 ?\s))

Message #23 received at 24972 <at> debbugs.gnu.org (full text, mbox):

From: Liu Hui <liuhui1610 <at> gmail.com>
To: Mark Oteiza <mvoteiza <at> udel.edu>
Cc: 24972 <at> debbugs.gnu.org
Subject: Re: bug#24972: 26.0.50; Multibyte characters are misaligned in ibuffer
Date: Tue, 22 Nov 2016 14:54:06 +0800

在 2016年11月22日 13:12, Mark Oteiza 写道:
> On 22/11/16 at 11:51am, Liu Hui wrote:
>> Thank you, but the trailing "..." is missing for long buffer names, no
>> matter whether they contain multibyte characters. For example,
>> "01234567890123456789" becomes "012345678901234567". The normal result
>> should be "012345678901234...".
>
> Would you try the following?
>
> diff --git a/lisp/ibuffer.el b/lisp/ibuffer.el
> index faadb67..c550b7d 100644
> --- a/lisp/ibuffer.el
> +++ b/lisp/ibuffer.el
> @@ -1559,16 +1559,17 @@ ibuffer-compile-make-eliding-form
>  		  `(concat ,ellipsis
>  			   (substring ,strvar
>  				      (string-width ibuffer-eliding-string)))
> -		`(truncate-string-to-width
> -		  ,strvar strlen nil nil
> -		  ,ellipsis))
> +		`(concat
> +		  (truncate-string-to-width
> +                   ,strvar (- strlen (string-width ,ellipsis)) nil ?.)
> +                  ,ellipsis))
>  	   ,strvar)
>        strvar)))
>
>  (defun ibuffer-compile-make-substring-form (strvar maxvar from-end-p)
>    (if from-end-p
> -      `(truncate-string-to-width str (string-width str) (- strlen ,maxvar))
> -    `(truncate-string-to-width ,strvar ,maxvar)))
> +      `(truncate-string-to-width str (string-width str) (- strlen ,maxvar) nil ?\s)
> +    `(truncate-string-to-width ,strvar ,maxvar nil ?\s)))
>
>  (defun ibuffer-compile-make-format-form (strvar widthform alignment)
>    (let* ((left `(make-string tmp2 ?\s))
>

It works very well. Thank you.

Message #28 received at 24972-done <at> debbugs.gnu.org (full text, mbox):

From: Mark Oteiza <mvoteiza <at> udel.edu>
To: Liu Hui <liuhui1610 <at> gmail.com>
Cc: 24972-done <at> debbugs.gnu.org
Subject: Re: bug#24972: 26.0.50; Multibyte characters are misaligned in ibuffer
Date: Tue, 22 Nov 2016 02:49:22 -0500

On 22/11/16 at 02:54pm, Liu Hui wrote:
> 
> 在 2016年11月22日 13:12, Mark Oteiza 写道:
> > On 22/11/16 at 11:51am, Liu Hui wrote:
> > > Thank you, but the trailing "..." is missing for long buffer names, no
> > > matter whether they contain multibyte characters. For example,
> > > "01234567890123456789" becomes "012345678901234567". The normal result
> > > should be "012345678901234...".
> > 
> > Would you try the following?
> > 
> > diff --git a/lisp/ibuffer.el b/lisp/ibuffer.el
> > index faadb67..c550b7d 100644
> > --- a/lisp/ibuffer.el
> > +++ b/lisp/ibuffer.el
> > @@ -1559,16 +1559,17 @@ ibuffer-compile-make-eliding-form
> >  		  `(concat ,ellipsis
> >  			   (substring ,strvar
> >  				      (string-width ibuffer-eliding-string)))
> > -		`(truncate-string-to-width
> > -		  ,strvar strlen nil nil
> > -		  ,ellipsis))
> > +		`(concat
> > +		  (truncate-string-to-width
> > +                   ,strvar (- strlen (string-width ,ellipsis)) nil ?.)
> > +                  ,ellipsis))
> >  	   ,strvar)
> >        strvar)))
> > 
> >  (defun ibuffer-compile-make-substring-form (strvar maxvar from-end-p)
> >    (if from-end-p
> > -      `(truncate-string-to-width str (string-width str) (- strlen ,maxvar))
> > -    `(truncate-string-to-width ,strvar ,maxvar)))
> > +      `(truncate-string-to-width str (string-width str) (- strlen ,maxvar) nil ?\s)
> > +    `(truncate-string-to-width ,strvar ,maxvar nil ?\s)))
> > 
> >  (defun ibuffer-compile-make-format-form (strvar widthform alignment)
> >    (let* ((left `(make-string tmp2 ?\s))
> > 
> 
> It works very well. Thank you.

Wahoo! Pushed, thanks.

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