bug#23033: 24.5; Lock file uses the same extension as the file it's locking

[Stefan Kangas]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Stefan Kangas <stefan@marxist.se>
>> Date: Sat, 9 Nov 2019 10:12:11 +0100
>> Cc: Michael Sloan <mgsloan@gmail.com>, Glenn Morris <rgm@gnu.org>, 
>> 23033@debbugs.gnu.org
>>
>> > I think we should only consider adding punctuation characters, because
>> > that would ensure these lock files are displayed right next to the
>> > files they lock, like today.  Moving the lock files away of the files
>> > they lock in the directory listing would be a disadvantage, IMO.
>>
>> On this MacOS machine, I see the following:
>>
>> $ ls -al
>> total 8
>> drwxr-xr-x  11 skangas  staff   352 Nov  9 10:05 .
>> lrwxr-xr-x   1 skangas  staff    33 Nov  9 10:05 .#foo ->
>> skangas@example.org.795
>> drwxr-xr-x  50 skangas  staff  1600 Nov  9 10:03 ..
>> -rw-r--r--   1 skangas  staff     0 Nov  9 10:03 a
>> -rw-r--r--   1 skangas  staff     0 Nov  9 10:03 e
>> -rw-r--r--   1 skangas  staff     3 Nov  9 10:05 foo
>> -rw-r--r--   1 skangas  staff     0 Nov  9 10:03 i
>> -rw-r--r--   1 skangas  staff     0 Nov  9 10:03 z
>>
>> In other words, the lock file is not next to the file it locks.  Are
>> you seeing something else?
>
> Yes.
>
> Is the above Gnu 'ls'?  And what is your locale?

I see this in the macOS ls and the GNU ls with LC_COLLATE=C.

With `LC_COLLATE=en_US.UTF.8 ls -al`, I see that:

lrwxrwxrwx 1 skangas skangas     32 2021-09-25 01:54  .#foo ->
skangas@joffe.1358372:1630641938
-rw-r--r-- 1 skangas skangas      4 2021-09-25 01:54  foo

>> How would the ordering differ with a suffix like ".lock" compared to
>> "#" or some other punctuation character?  I would have thought that it
>> would be very similar.  Maybe I'm missing something.
>
> The default file sort order in UTF-8 locales ignores punctuation
> characters.

So how about using ".#foo#" instead of ".#foo"?