GNU bug report logs -
#40949
26.3; substitute-env-in-file-name: Undefined variables not substituted
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Reported by: Marcus Harnisch <marcus.harnisch <at> gmx.net>
Date: Tue, 28 Apr 2020 21:01:03 UTC
Severity: normal
Found in version 26.3
Fixed in version 28.1
Done: Lars Ingebrigtsen <larsi <at> gnus.org>
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bug#40949
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(Tue, 28 Apr 2020 21:01:03 GMT)
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Marcus Harnisch <marcus.harnisch <at> gmx.net>
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New bug report received and forwarded. Copy sent to
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(Tue, 28 Apr 2020 21:01:03 GMT)
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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
With commit ee041f2d07b6ed485dc34c115588f973f046c9d4 the function
`substitute-env-in-file-name' was introduced.
The function substitutes environment variable references in filenames
with the help of `substitute-env-vars'. On systems that are neither
windows-nt nor ms-dos, the optional argument to that function is set to
t with the consequence that references to undefined variables are not
substituted. This is unexpected, IMHO.
Expected behaviour would match that of shell expansion, which
substitutes undefined variables with the empty string.
Cheers,
Marcus
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(Wed, 29 Apr 2020 11:29:02 GMT)
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Message #8 received at 40949 <at> debbugs.gnu.org (full text, mbox):
> From: Marcus Harnisch <marcus.harnisch <at> gmx.net>
> Date: Tue, 28 Apr 2020 22:38:14 +0200
>
> With commit ee041f2d07b6ed485dc34c115588f973f046c9d4 the function
> `substitute-env-in-file-name' was introduced.
>
> The function substitutes environment variable references in filenames
> with the help of `substitute-env-vars'. On systems that are neither
> windows-nt nor ms-dos, the optional argument to that function is set to
> t with the consequence that references to undefined variables are not
> substituted. This is unexpected, IMHO.
> Expected behaviour would match that of shell expansion, which
> substitutes undefined variables with the empty string.
Your report seems to imply that the behavior on MS-Windows is
different, but it isn't: if the variable is undefined, we leave it
unaltered on those systems as well.
Whether Emacs should follow what the shell does is a separate issue.
In this case, since we use this function in substitute-in-file-name,
what it does should serve what substitute-in-file-name was always
doing: it left the $foo constructs unaltered.
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(Wed, 29 Apr 2020 12:07:02 GMT)
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Message #11 received at 40949 <at> debbugs.gnu.org (full text, mbox):
On 29/04/2020 13.27, Eli Zaretskii wrote:
> Your report seems to imply that the behavior on MS-Windows is
> different, but it isn't: if the variable is undefined, we leave it
> unaltered on those systems as well.
The definition is special-cased for MS-Windows (passes result of getenv
as opposed to a hardcoded t as optional argument to substitute-env-vars)
and I am not able to check the relevant behaviour on that platform.
That's why I pointed it out.
> Whether Emacs should follow what the shell does is a separate issue.
> In this case, since we use this function in substitute-in-file-name,
> what it does should serve what substitute-in-file-name was always
> doing: it left the $foo constructs unaltered.
It is probably moot to argue against long-standing practice, but the
behaviour could perhaps benefit from a note in docstrings of functions
that rely on `s-e-i-f-n'. Having used Emacsen and POSIX systems for
about the same number of decades, I found this difference (Emacs vs
shell) rather surprising.
Thanks,
Marcus
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(Sun, 13 Jun 2021 12:16:02 GMT)
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Message #14 received at 40949 <at> debbugs.gnu.org (full text, mbox):
Marcus Harnisch <marcus.harnisch <at> gmx.net> writes:
>> Whether Emacs should follow what the shell does is a separate issue.
>> In this case, since we use this function in substitute-in-file-name,
>> what it does should serve what substitute-in-file-name was always
>> doing: it left the $foo constructs unaltered.
> It is probably moot to argue against long-standing practice, but the
> behaviour could perhaps benefit from a note in docstrings of functions
> that rely on `s-e-i-f-n'.
Makes sense -- it is somewhat surprising behaviour, so I've now done
this in Emacs 28 for substitute-in-file-name.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
bug marked as fixed in version 28.1, send any further explanations to
40949 <at> debbugs.gnu.org and Marcus Harnisch <marcus.harnisch <at> gmx.net>
Request was from
Lars Ingebrigtsen <larsi <at> gnus.org>
to
control <at> debbugs.gnu.org
.
(Sun, 13 Jun 2021 12:16:02 GMT)
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bug archived.
Request was from
Debbugs Internal Request <help-debbugs <at> gnu.org>
to
internal_control <at> debbugs.gnu.org
.
(Mon, 12 Jul 2021 11:24:08 GMT)
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This bug report was last modified 2 years and 287 days ago.
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