GNU bug report logs - #2940
[macOS] C-s in dired fails to find umlauts in filenames (due to wrong file-name-coding-system)

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Package: emacs; Reported by: Markus Triska <markus.triska@HIDDEN>; dated Thu, 9 Apr 2009 16:35:04 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

Removed tag(s) moreinfo. Request was from Stefan Kangas <stefan@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: "Markus Triska" <markus.triska@HIDDEN>
To: "Stefan Kangas" <stefan@HIDDEN>
Subject: Aw: Re: 23.0.92; C-s in dired fails to find files with umlauts
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> I can't reproduce this on current master. Are you still seeing this
> on a modern version of Emacs?

Yes, I can reproduce this exact same issue with Emacs 26.1 on OSX,
and also with a recent version of Debian.

All the best,
Markus

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#2940; Package emacs. Full text available.

Added tag(s) moreinfo. Request was from Stefan Kangas <stefan@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Stefan Kangas <stefan@HIDDEN>
To: Markus Triska <markus.triska@HIDDEN>
Subject: Re: 23.0.92; C-s in dired fails to find files with umlauts
In-Reply-To: <m24owxzt8f.fsf@HIDDEN> (Markus Triska's message of "Thu, 09 Apr
 2009 18:28:48 +0200")
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Markus Triska <markus.triska@HIDDEN> writes:

> With ~/t=C3=B6st.txt existing, when I do:
>
>    $ emacs -Q ~/
>
> and press:
>
>    C-\ german-postfix RET C-s oe RET
>
> to search for "=C3=B6" in the dired buffer (the input method correctly
> converts the entered "oe" to "=C3=B6" in the minibuffer), I get:
>
>    Failing wrapped I-search [DE<]: =C3=B6

I can't reproduce this on current master.  Are you still seeing this
on a modern version of Emacs?

If I don't hear back from you within a couple of weeks, I'll just
close this bug as unreproducible.

Best regards,
Stefan Kangas

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#2940; Package emacs. Full text available.

Changed bug title to '[macOS] C-s in dired fails to find umlauts in filenames (due to wrong file-name-coding-system)' from '23.0.92; C-s in dired fails to find files with umlauts' Request was from Noam Postavsky <npostavs@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Removed tag(s) moreinfo. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

bug reassigned from package 'emacs' to 'emacs,ns'. Request was from Lars Magne Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Alp Aker <aker@HIDDEN>
Subject: Re: bug#2940: 23.0.92; C-s in dired fails to find files with umlauts
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Glenn Morris wrote:

> IIUC, he's not using a --with-ns build. It's a "normal", gtk build that
> happens to be running on a Mac. So ns-win.el isn't in use.

My mistake; since it was running on Darwin I just assumed an NS build, and 
didn't look at the build info in the original bug report.

Making this the default behavior for non-NS builds running on a Mac is 
probably TRT.  It was once possible to use Darwin with UFS, but that 
hasn't been true for the last three major versions, so going forward it 
will be a vanishingly rare case where (eq system-type 'darwin) doesn't 
imply that the file system is a variant of HFS+.  And it's reasonable for 
users to expect that Emacs will, out of the box, properly handle file 
names on the system it was built on.

OTOH, just adding something like:

  (when (eq system-type 'darwin)
     (require 'ucs-normalize)
     (setq file-name-coding-system 'utf-8-hfs))

to x-win.el might not be the best solution.  The utf-8-hfs coding system 
does both post-read conversion (normalizing to precomposed utf-8) and 
pre-write conversion (normalizing to Apple's variant of decomposed utf-8). 
The latter is unnecessary:  the OS itself will do normalization on any 
filename handed to it.  (Observe that the coding system defined in 
ns-win.el only does post-read conversion.)

For local operations, the redundant pre-write conversion is harmless. 
But using decomposed utf-8 might cause trouble when dealing with remote 
files.  So it's probably more robust to follow ns-win.el's lead and define 
a coding system that only does post-read conversion.  Thus:

   (when (eq system-type 'darwin)
     (require 'ucs-normalize)
     (define-coding-system 'utf-8-hfs-for-read
       "UTF-8 based coding system for HFS+ file names."
       :coding-type 'utf-8
       :mnemonic ?U
       :charset-list '(unicode)
       :post-read-conversion 'ucs-normalize-hfs-nfd-post-read-conversion)
     (setq file-name-coding-system 'utf-8-hfs-for-read))

would be the addition to make to x-win.el.

Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#2940; Package emacs. Full text available.

Message received at 2940 <at> debbugs.gnu.org:

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From: Glenn Morris <rgm@HIDDEN>
To: Alp Aker <aker@HIDDEN>
Subject: Re: bug#2940: 23.0.92; C-s in dired fails to find files with umlauts
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Alp Aker wrote:

> OTOH, the code in question has been present in ns-win.el since the NS
> code was first merged into the main branch (rev 89434), so I'm not
> sure how the OP's problem arose in the first place.

IIUC, he's not using a --with-ns build. It's a "normal", gtk build that
happens to be running on a Mac. So ns-win.el isn't in use.

Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#2940; Package emacs. Full text available.

Message received at 2940 <at> debbugs.gnu.org:

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From: Alp Aker <aker@HIDDEN>
Subject: Re: bug#2940: 23.0.92; C-s in dired fails to find files with umlauts
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Eli Zaretskii wrote:

>>>    (require 'ucs-normalize)
>>>    (setq file-name-coding-system 'utf-8-hfs)
>
> It could be that Emacs should do this on that platform automatically, 
> yes.  But some Darwin expert should look into this and provide feedback, 
> before we decide.

I'm no expert, but it doesn't look as if this is necessary. 
/lisp/term/ns-win.el already defines a coding system utf-8-nfd that 
performs normalization and it sets that as the value of 
file-name-coding-system.  This takes care of the fact that the HFS+ 
filesystem uses decomposed file names, and indeed I can't reproduce (in 
either 24.0.50 or 23.3) the behavior described in the original bug report.

OTOH, the code in question has been present in ns-win.el since the NS code 
was first merged into the main branch (rev 89434), so I'm not sure how the 
OP's problem arose in the first place.

Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#2940; Package emacs. Full text available.

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From: Markus Triska <markus.triska@HIDDEN>
To: Glenn Morris <rgm@HIDDEN>
Subject: Re: bug#2940: 23.0.92; C-s in dired fails to find files with umlauts
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Glenn Morris <rgm@HIDDEN> writes:

>>    (require 'ucs-normalize)
>>    (setq file-name-coding-system 'utf-8-hfs)
>
> I know nothing about this area: Is this an acceptable solution (in
> which case I will close this report); or should it work out-of-the-box
> with no configuration?

In my personal use, I expected it to work out of the box. It was also
initially unclear to me that you need to explicitly require
ucs-normalize in order to use utf8-8-hfs. When you do, in "emacs -Q":

   (setq file-name-coding-system 'utf-8-hfs)

you cannot do much anymore with that Emacs instance, since you get
"Invalid coding system: utf-8-hfs" on almost all key presses. This is a
general issue though that also happens when you mistype a coding system.

Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#2940; Package emacs. Full text available.

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Date: Mon, 11 Jul 2011 05:56:18 +0300
From: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#2940: 23.0.92; C-s in dired fails to find files with umlauts
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> From: Glenn Morris <rgm@HIDDEN>
> Date: Sun, 10 Jul 2011 22:01:44 -0400
> Cc: 2940 <at> debbugs.gnu.org
> 
> Markus Triska wrote:
> 
> > Thank you, it does if I add this to ~/.emacs:
> >
> >    (require 'ucs-normalize)
> >    (setq file-name-coding-system 'utf-8-hfs)
> 
> I know nothing about this area: Is this an acceptable solution (in which
> case I will close this report); or should it work out-of-the-box with no
> configuration?

It could be that Emacs should do this on that platform automatically,
yes.  But some Darwin expert should look into this and provide
feedback, before we decide.

Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#2940; Package emacs. Full text available.

Message received at 2940 <at> debbugs.gnu.org:

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Markus Triska wrote:

> Thank you, it does if I add this to ~/.emacs:
>
>    (require 'ucs-normalize)
>    (setq file-name-coding-system 'utf-8-hfs)

I know nothing about this area: Is this an acceptable solution (in which
case I will close this report); or should it work out-of-the-box with no
configuration?

Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#2940; Package emacs. Full text available.

Message received at 2940 <at> debbugs.gnu.org:

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To: Glenn Morris <rgm@HIDDEN>
Subject: Re: bug#2940: 23.0.92; C-s in dired fails to find files with umlauts
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Glenn Morris <rgm@HIDDEN> writes:

> It was suggested that the ucs-normalize library, which has been part of
> Emacs for some time, should fix this. Does it?

Thank you, it does if I add this to ~/.emacs:

   (require 'ucs-normalize)
   (setq file-name-coding-system 'utf-8-hfs)

Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#2940; Package emacs. Full text available.

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It was suggested that the ucs-normalize library, which has been part of
Emacs for some time, should fix this. Does it? Please reply and let us
know if you still see this problem in 23.3.

Information forwarded to owner <at> debbugs.gnu.org, bug-gnu-emacs@HIDDEN:
bug#2940; Package emacs. Full text available.

Added tag(s) moreinfo. Request was from Glenn Morris <rgm@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Kenichi Handa <handa@HIDDEN>
To: Markus Triska <markus.triska@HIDDEN>, 2940 <at> debbugs.gnu.org
CC: gnu-emacs-bug@HIDDEN
In-reply-to: <m27i1syebo.fsf@HIDDEN> (message from Markus Triska on Fri, 10
	Apr 2009 12:48:27 +0200)
Subject: Re: bug#2940: 23.0.92; C-s in dired fails to find files with
 umlauts
References: <mailman.4984.1239295440.31690.bug-gnu-emacs@HIDDEN>
	<buoprflp8ev.fsf@HIDDEN>
	<mailman.5035.1239343440.31690.bug-gnu-emacs@HIDDEN> <m27i1syebo.fsf@HIDDEN>
Message-Id: <E1MbZMg-0007Nv-P9@etlken>
Date: Thu, 13 Aug 2009 21:25:06 +0900

In article <m27i1syebo.fsf@HIDDEN>, Markus Triska <markus.triska@HIDDEN> writes:

> Stefan Monnier <monnier@HIDDEN> writes:
> > Please try out this new ucs-normalize package and tell us if it solves
> > your problem and/or suffers from other problems.

> M-x eval-buffer on the (ucs-)normalize.el file posted at:

>    http://lists.gnu.org/archive/html/emacs-devel/2009-04/msg00185.html

> yields:

>    End of file during parsing

I've just committed a new version of ucs-normalize.el.
Could you please try it?

By the way, it contains several autoload cookies.  Should I
re-generate loaddefs.el, copy it to ldefs-boot.el, and
commit it?

---
Kenichi Handa
handa@HIDDEN

Acknowledgement sent to Kenichi Handa <handa@HIDDEN>:
Extra info received and forwarded to list. Copy sent to Emacs Bugs <bug-gnu-emacs@HIDDEN>. Full text available.