GNU bug report logs - #4708
23.1; completion-try-completion adds an extra $: $$HOMj

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From: help-debbugs <at> gnu.org (Emacs bug Tracking System)
To: "Drew Adams" <drew.adams <at> oracle.com>
Subject: bug#4708 closed by Stefan Monnier <monnier <at> iro.umontreal.ca> (Re:
 bug#4708: 23.1; completion-try-completion adds an extra $:  $$HOMj)
Date: Wed, 14 Oct 2009 04:10:09 +0000

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This is an automatic notification regarding your bug report
which was filed against the emacs package:

#4708: 23.1; completion-try-completion adds an extra $:  $$HOMj

It has been closed by Stefan Monnier <monnier <at> iro.umontreal.ca>.

Their explanation is attached below along with your original report.
If this explanation is unsatisfactory and you have not received a
better one in a separate message then please contact Stefan Monnier <monnier <at> iro.umontreal.ca> by
replying to this email.


-- 
4708: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=4708
Emacs Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: "Drew Adams" <drew.adams <at> oracle.com>
Subject: Re: bug#4708: 23.1; completion-try-completion adds an extra $:  $$HOMj
Date: Wed, 14 Oct 2009 00:02:18 -0400

>> That try-completion will return nil when applied to "/foo/bar/$$HOMj",
>> so basically the $HOMj -> $$HOMj is considered to be a form 
>> of completion.
> Sorry, I don't follow that.

Just what I said: read-file-name-internal considered that changing
"$HOMj" into "$$HOMj" is a form of completion.  Just like hitting TAB
might change Foo into FOO in some completion cases.

> And did you mean try-completion or completion-try-completion?

Makes no difference, it's done in the completion-table, i.e. at
a lower level.


        Stefan

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From: "Drew Adams" <drew.adams <at> oracle.com>
To: <bug-gnu-emacs <at> gnu.org>
Subject: 23.1; completion-try-completion adds an extra $:  $$HOMj
Date: Mon, 12 Oct 2009 12:05:32 -0700

emacs -Q
 
M-: (completion-try-completion "c:/some-dir/$HOMj" nil 16)
 
correctly returns: (c:/some-dir/$HOMEj" . 17)
 
M-: (completion-try-completion "c:/some-dir/$HOMj" nil 17)
 
returns: ("c:/some-dir/$$HOMj" . 18)
 
That doesn't seem correct. Is it correct to have $$ here? If so, can
you please explain it a bit (why)?
 
Also, if this is correct behavior, then please explain this in the doc
string of `completion-try-completion'. The doc string currently says
that STRING, in the return value of (STRING . NEWPOINT), is "the
completed result string". But "result string" cannot be right, if
we're talking about the result of completion. There is no completion
that contains $$HOM.
 
In GNU Emacs 23.1.1 (i386-mingw-nt5.1.2600)
 of 2009-07-29 on SOFT-MJASON
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.4)'
 

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