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            <42b1c81a-269e-6e92-61ae-81309d2f59f0@morningstar2.co.uk>
            <ZMPbRbBvKEsaL3xW@polynum.com>
            <e04314e7-2c7c-9832-4e94-ae6ed63f7953@nag.co.uk>
            <cdf0f0b4-fec2-db51-36fb-7f578b8bdfcf@morningstar2.co.uk>
            <ZMPiT40+/5h25GY5@polynum.com>
            <f1b86bed-c65e-e919-b5d1-402f265b4d07@morningstar2.co.uk>
            <9bdba073-3e55-a6b6-f95e-9d4a2eb007ca@morningstar2.co.uk>
            <ZMP6IgKkhS3pdsP+@polynum.com> <19vogp84f1o55$.dlg@nililand.de>
            <ZMQF9IObP2zeUd+Q@polynum.com>
Content-Type: text/plain; charset="UTF-8"
Message-ID:  <CANfjC0-9uEKsuhNVA24gXCkSvLxYeBY_a+w83XTt+WfMC5NLpw@mail.gmail.com>
Date:         Fri, 28 Jul 2023 15:48:40 -0300
Reply-To:     Mailing list for the LaTeX3 project
              <LATEX-L@LISTSERV.UNI-HEIDELBERG.DE>
Sender:       Mailing list for the LaTeX3 project <LATEX-L@LISTSERV.UNI-HEIDELBERG.DE>
From:         Phelype Oleinik <phe.h.o1@GMAIL.COM>
Subject: Re: "new" \input vs. primitive behavior
To:           LATEX-L@LISTSERV.UNI-HEIDELBERG.DE
In-Reply-To:  <ZMQF9IObP2zeUd+Q@polynum.com>
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Content-Transfer-Encoding: 8bit
Status: R

On Fri, Jul 28, 2023 at 3:16 PM LARONDE Thierry <tlaronde@polynum.com> wrote:
>
> I simply thought about the feature: when wanting the size, it can
> be for whatever file.  Adding automatically an extension was
> preventing from obtaining the size of a file without an extension and
> this was not giving the size of the file as specified (being partly
> specified, not absolute was not a problem; changing the filename was).
> This was stupid to not be able to obtain the size of a filename
> without extension or to alter the filename. So I didn't implement
> it this way but, contrary to the others, I tried to described
> precisely what the implementation was doing so that somebody reading
> the description would have an accurate description of the behavior.

If I'm not mistaken, the behaviour for file lookup (regardless which
primitive) is (crappy pseudocode warning):

If Exists(file name)
  Return 0 % file found
Else
  If ContainsExtension(file name)
    Return 1 % not found
  Else
    If Exists(file name + ".tex")
      Return 0 % file found
    Else
      Return 1 % not found
    Endif
  Endif
Endif

So it /is/ possible to use |\filesize| or |\input| or... on a file
without extension, because the lookup first checks the name as given.
If that name is not found, and only if the file name doesn't have an
extension (i.e., a "." after the last "/"), then that name is tried with
".tex" appended to it.  It's been a while, so that may not be 100%
correct, but I'm pretty sure it's possible to use extensionless files.

Best,
Phelype