GNU bug report logs - #14806
24.3.50; Enabling read-file-name-completion-ignore-case breaks url-handler-mode

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

From: Stephen Berman <stephen.berman <at> gmx.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.50; Enabling read-file-name-completion-ignore-case breaks
 url-handler-mode
Date: Sat, 06 Jul 2013 21:57:13 +0200

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

0. emacs -Q
1. M-: (setq read-file-name-completion-ignore-case t)  (or customize it,
   or use set-variable)
2. M-x url-handler-mode
3. C-x C-f http://www.gnu.org RET
=> error "Unimplemented"

Here's the backtrace:

[Message part 2 (text/plain, attachment)]

[Message part 3 (text/plain, inline)]

If you leave read-file-name-completion-ignore-case nil (the default) and
do the rest of recipe, it downloads the content of the URL, as expected.

I suspect this bug is related to bug#11339.


In GNU Emacs 24.3.50.6 (x86_64-suse-linux-gnu, GTK+ Version 3.4.4)
 of 2013-07-05 on rosalinde
Bzr revision: 113286 sdl.web <at> gmail.com-20130705023739-rabvfwfbinmi56v3
Windowing system distributor `The X.Org Foundation', version 11.0.11203000
System Description:	openSUSE 12.2 (x86_64)

Configured using:
 `configure --without-toolkit-scroll-bars CFLAGS=-g3 -O0'

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=local
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Message #8 received at 14806 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Stephen Berman <stephen.berman <at> gmx.net>
Cc: 14806 <at> debbugs.gnu.org
Subject: Re: bug#14806: 24.3.50;
 Enabling read-file-name-completion-ignore-case breaks url-handler-mode
Date: Wed, 10 Jul 2013 16:41:39 -0400

Stephen Berman wrote:

> 0. emacs -Q
> 1. M-: (setq read-file-name-completion-ignore-case t)  (or customize it,
>    or use set-variable)
> 2. M-x url-handler-mode
> 3. C-x C-f http://www.gnu.org RET
> => error "Unimplemented"

RET actually runs minibuffer-complete-and-exit, when
completion-ignore-case is non-nil it tries to complete the input,
completion is (obviously) not implemented for URLs.
Dunno what to do about that.

Message #11 received at 14806 <at> debbugs.gnu.org (full text, mbox):

From: Stephen Berman <stephen.berman <at> gmx.net>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 14806 <at> debbugs.gnu.org
Subject: Re: bug#14806: 24.3.50;
 Enabling read-file-name-completion-ignore-case breaks url-handler-mode
Date: Thu, 11 Jul 2013 00:20:56 +0200

On Wed, 10 Jul 2013 16:41:39 -0400 Glenn Morris <rgm <at> gnu.org> wrote:

> Stephen Berman wrote:
>
>> 0. emacs -Q
>> 1. M-: (setq read-file-name-completion-ignore-case t)  (or customize it,
>>    or use set-variable)
>> 2. M-x url-handler-mode
>> 3. C-x C-f http://www.gnu.org RET
>> => error "Unimplemented"
>
> RET actually runs minibuffer-complete-and-exit, when
> completion-ignore-case is non-nil it tries to complete the input,
> completion is (obviously) not implemented for URLs.
> Dunno what to do about that.

To prevent the problem I reported, we could either change

(defun url-file-name-completion (url directory &optional predicate)
  (error "Unimplemented"))

to

(defun url-file-name-completion (url directory &optional predicate)
  (ignore))

or replace

(put 'file-name-completion 'url-file-handlers 'url-file-name-completion)

by

(put 'file-name-completion 'url-file-handlers 'ignore)

url-handlers.el already does the latter for "operations that we do not
support yet (DAV!!!)".  If the user tries to complete with TAB,
url-file-name-all-completions errors with "Unimplemented".  If we use
'ignore here too, then trying to complete gives "[No match]".  But as
long as the URL is valid and real, the page gets downloaded, so this
certainly seems better than the current state.  Is there some other
reason not to do this?

Steve Berman

Message #14 received at 14806 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Stephen Berman <stephen.berman <at> gmx.net>
Cc: Glenn Morris <rgm <at> gnu.org>, 14806 <at> debbugs.gnu.org
Subject: Re: bug#14806: 24.3.50;
 Enabling read-file-name-completion-ignore-case breaks url-handler-mode
Date: Wed, 31 Jul 2013 00:19:57 -0400

> (defun url-file-name-completion (url directory &optional predicate)
>   (ignore))

I installed something like that.


        Stefan

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