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Subject: bug#76033: file-equal-p should accept nil arguments
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I think file-equal-p should accept nil arguments and consider the result
unspecified as in its docstring: "If FILE1 or FILE2 does not exist, the
return value is unspecified."

Currently, file-equal-p signals an error when nil file names are specified.

-Stephane

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:monospac=
e"><div class=3D"gmail_default">I think file-equal-p should accept nil argu=
ments and consider the result unspecified as in its docstring: &quot;If FIL=
E1 or FILE2 does not exist, the return value is unspecified.&quot;</div><di=
v class=3D"gmail_default"><br></div><div class=3D"gmail_default">Currently,=
 file-equal-p signals an error when nil file names are specified.</div><div=
 class=3D"gmail_default"><br></div><div class=3D"gmail_default">-Stephane</=
div></div></div>

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Subject: bug#76033: Acknowledgement (file-equal-p should accept nil arguments)
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Subject: bug#76033: file-equal-p should accept nil arguments
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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> From: Ship Mints <shipmints@HIDDEN>
> Date: Mon, 3 Feb 2025 13:12:08 -0500
> 
> I think file-equal-p should accept nil arguments and consider the result unspecified as in its docstring: "If
> FILE1 or FILE2 does not exist, the return value is unspecified."
> 
> Currently, file-equal-p signals an error when nil file names are specified.

Yes, because nil is not a valid file name.  So it neither exists nor
does not exist.  It simply doesn't name a file.

If we accept nil, then why not t or any other symbol or a number?

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Subject: bug#76033: file-equal-p should accept nil arguments
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If the file can't be opened based on the arguments, then it will fail as it
should. I'd simply add a stringp test and the result is unspecified, per
the docstring, if the arguments aren't strings.

On Mon, Feb 3, 2025 at 3:00=E2=80=AFPM Eli Zaretskii <eliz@HIDDEN> wrote:

> > From: Ship Mints <shipmints@HIDDEN>
> > Date: Mon, 3 Feb 2025 13:12:08 -0500
> >
> > I think file-equal-p should accept nil arguments and consider the resul=
t
> unspecified as in its docstring: "If
> > FILE1 or FILE2 does not exist, the return value is unspecified."
> >
> > Currently, file-equal-p signals an error when nil file names are
> specified.
>
> Yes, because nil is not a valid file name.  So it neither exists nor
> does not exist.  It simply doesn't name a file.
>
> If we accept nil, then why not t or any other symbol or a number?
>

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:monospac=
e">If the file can&#39;t be opened based on the arguments, then it will fai=
l as it should. I&#39;d simply add a stringp test and the result is unspeci=
fied, per the docstring, if the arguments aren&#39;t strings.</div></div><b=
r><div class=3D"gmail_quote gmail_quote_container"><div dir=3D"ltr" class=
=3D"gmail_attr">On Mon, Feb 3, 2025 at 3:00=E2=80=AFPM Eli Zaretskii &lt;<a=
 href=3D"mailto:eliz@HIDDEN">eliz@HIDDEN</a>&gt; wrote:<br></div><blockqu=
ote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px=
 solid rgb(204,204,204);padding-left:1ex">&gt; From: Ship Mints &lt;<a href=
=3D"mailto:shipmints@HIDDEN" target=3D"_blank">shipmints@HIDDEN</a>&g=
t;<br>
&gt; Date: Mon, 3 Feb 2025 13:12:08 -0500<br>
&gt; <br>
&gt; I think file-equal-p should accept nil arguments and consider the resu=
lt unspecified as in its docstring: &quot;If<br>
&gt; FILE1 or FILE2 does not exist, the return value is unspecified.&quot;<=
br>
&gt; <br>
&gt; Currently, file-equal-p signals an error when nil file names are speci=
fied.<br>
<br>
Yes, because nil is not a valid file name.=C2=A0 So it neither exists nor<b=
r>
does not exist.=C2=A0 It simply doesn&#39;t name a file.<br>
<br>
If we accept nil, then why not t or any other symbol or a number?<br>
</blockquote></div>

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Ship Mints <shipmints@HIDDEN> writes:

Hi,

> I think file-equal-p should accept nil arguments and consider the
> result unspecified as in its docstring: "If FILE1 or FILE2 does not
> exist, the return value is unspecified."

This is against the docstring. file-equal-p has two arguments, "files
FILE1 and FILE2". nil is not a file.

> Currently, file-equal-p signals an error when nil file names are
> specified.

As specified. We should not support to write too sloppy code. Getting an
error is often an indication, that the code using file-equal-p is not in
its best shape.

> -Stephane

Best regards.

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I am also against writing sloppy code, of course, but if a change like this
can help avoid error signals for cases as I illustrated, I figured it was
worth a discussion. Of course, the docstring could be changed to say that
the arguments need to resolve to files and, if not, the return value is
unspecified.

I will offer patches related to calling file-equal-p with incorrect
arguments as I've been doing, like to project.el.

Please close this issue.

-Stephane

On Tue, Feb 4, 2025 at 3:05=E2=80=AFAM Michael Albinus <michael.albinus@gmx=
.de>
wrote:

> Ship Mints <shipmints@HIDDEN> writes:
>
> Hi,
>
> > I think file-equal-p should accept nil arguments and consider the
> > result unspecified as in its docstring: "If FILE1 or FILE2 does not
> > exist, the return value is unspecified."
>
> This is against the docstring. file-equal-p has two arguments, "files
> FILE1 and FILE2". nil is not a file.
>
> > Currently, file-equal-p signals an error when nil file names are
> > specified.
>
> As specified. We should not support to write too sloppy code. Getting an
> error is often an indication, that the code using file-equal-p is not in
> its best shape.
>
> > -Stephane
>
> Best regards.
>

--000000000000f985c8062d4e8b2b
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:monospac=
e">I am also against writing sloppy code, of course, but if a change like t=
his can help avoid error signals for cases as I illustrated, I figured it w=
as worth a discussion. Of course, the docstring could be changed to say tha=
t the arguments need to resolve to files and, if not, the return value is u=
nspecified.</div><div class=3D"gmail_default" style=3D"font-family:monospac=
e"><br></div><div class=3D"gmail_default" style=3D"font-family:monospace"><=
div class=3D"gmail_default">I will offer patches related to calling file-eq=
ual-p with incorrect arguments as I&#39;ve been doing, like to project.el.<=
/div><div class=3D"gmail_default"><br></div><div class=3D"gmail_default">Pl=
ease close this issue.</div><div class=3D"gmail_default"><br></div><div cla=
ss=3D"gmail_default">-Stephane</div></div></div><br><div class=3D"gmail_quo=
te gmail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Feb=
 4, 2025 at 3:05=E2=80=AFAM Michael Albinus &lt;<a href=3D"mailto:michael.a=
lbinus@HIDDEN">michael.albinus@HIDDEN</a>&gt; wrote:<br></div><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px soli=
d rgb(204,204,204);padding-left:1ex">Ship Mints &lt;<a href=3D"mailto:shipm=
ints@HIDDEN" target=3D"_blank">shipmints@HIDDEN</a>&gt; writes:<br>
<br>
Hi,<br>
<br>
&gt; I think file-equal-p should accept nil arguments and consider the<br>
&gt; result unspecified as in its docstring: &quot;If FILE1 or FILE2 does n=
ot<br>
&gt; exist, the return value is unspecified.&quot;<br>
<br>
This is against the docstring. file-equal-p has two arguments, &quot;files<=
br>
FILE1 and FILE2&quot;. nil is not a file.<br>
<br>
&gt; Currently, file-equal-p signals an error when nil file names are<br>
&gt; specified.<br>
<br>
As specified. We should not support to write too sloppy code. Getting an<br=
>
error is often an indication, that the code using file-equal-p is not in<br=
>
its best shape.<br>
<br>
&gt; -Stephane<br>
<br>
Best regards.<br>
</blockquote></div>

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and subject line Re: bug#76033: file-equal-p should accept nil arguments
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I think file-equal-p should accept nil arguments and consider the result
unspecified as in its docstring: "If FILE1 or FILE2 does not exist, the
return value is unspecified."

Currently, file-equal-p signals an error when nil file names are specified.

-Stephane

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:monospac=
e"><div class=3D"gmail_default">I think file-equal-p should accept nil argu=
ments and consider the result unspecified as in its docstring: &quot;If FIL=
E1 or FILE2 does not exist, the return value is unspecified.&quot;</div><di=
v class=3D"gmail_default"><br></div><div class=3D"gmail_default">Currently,=
 file-equal-p signals an error when nil file names are specified.</div><div=
 class=3D"gmail_default"><br></div><div class=3D"gmail_default">-Stephane</=
div></div></div>

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To: Ship Mints <shipmints@HIDDEN>
Subject: Re: bug#76033: file-equal-p should accept nil arguments
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Ship Mints <shipmints@HIDDEN> writes:

Hi Ship,

> I am also against writing sloppy code, of course, but if a change like
> this can help avoid error signals for cases as I illustrated, I
> figured it was worth a discussion. Of course, the docstring could be
> changed to say that the arguments need to resolve to files and, if
> not, the return value is unspecified.
>
> I will offer patches related to calling file-equal-p with incorrect
> arguments as I've been doing, like to project.el.
>
> Please close this issue.

Done.

> -Stephane

Best regards, Michael.


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To: Ship Mints <shipmints@HIDDEN>
Subject: bug#76033: closed (Re: bug#76033: file-equal-p should accept nil
 arguments)
Message-ID: <handler.76033.D76033.173866607320489.notifdone <at> debbugs.gnu.org>
References: <87ldumx9yp.fsf@HIDDEN>
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Your bug report

#76033: file-equal-p should accept nil arguments

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 76033 <at> debbugs.gnu.org.

--=20
76033: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76033
GNU Bug Tracking System
Contact help-debbugs@HIDDEN with problems

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Ship Mints <shipmints@HIDDEN> writes:

Hi Ship,

> I am also against writing sloppy code, of course, but if a change like
> this can help avoid error signals for cases as I illustrated, I
> figured it was worth a discussion. Of course, the docstring could be
> changed to say that the arguments need to resolve to files and, if
> not, the return value is unspecified.
>
> I will offer patches related to calling file-equal-p with incorrect
> arguments as I've been doing, like to project.el.
>
> Please close this issue.

Done.

> -Stephane

Best regards, Michael.


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I think file-equal-p should accept nil arguments and consider the result
unspecified as in its docstring: "If FILE1 or FILE2 does not exist, the
return value is unspecified."

Currently, file-equal-p signals an error when nil file names are specified.

-Stephane

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:monospac=
e"><div class=3D"gmail_default">I think file-equal-p should accept nil argu=
ments and consider the result unspecified as in its docstring: &quot;If FIL=
E1 or FILE2 does not exist, the return value is unspecified.&quot;</div><di=
v class=3D"gmail_default"><br></div><div class=3D"gmail_default">Currently,=
 file-equal-p signals an error when nil file names are specified.</div><div=
 class=3D"gmail_default"><br></div><div class=3D"gmail_default">-Stephane</=
div></div></div>

--0000000000009fc367062d40db8b--



------------=_1738666083-20526-1--

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tags 76033 + wontfix
quit

Last modified: Tue, 4 Feb 2025 11:30:02 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.