GNU bug report logs - #43375
26.1: file-directory-p returns t for empty string

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Package: emacs;

Reported by: Boruch Baum <boruch_baum <at> gmx.com>

Date: Sun, 13 Sep 2020 12:48:02 UTC

Severity: minor

Tags: fixed

Found in version 26.1

Fixed in version 28.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Boruch Baum <boruch_baum <at> gmx.com>
Cc: schwab <at> linux-m68k.org, 43375 <at> debbugs.gnu.org
Subject: bug#43375: 26.1: file-directory-p returns t for empty string
Date: Sun, 13 Sep 2020 18:01:51 +0300

> Date: Sun, 13 Sep 2020 10:39:43 -0400
> From: Boruch Baum <boruch_baum <at> gmx.com>
> Cc: 43375 <at> debbugs.gnu.org
> 
> > >   (file-directory-p "")
> >
> > This is not a bug, as Emacs always works with expanded and canonicalized
> > file names (the result of applying expand-file-name).
> 
> Then the docstring could be clearer and say "Return t if the expansion
> of FILENAME names an existing directory"

That's not a useful doc string, because "expansion of FILENAME" is not
well defined, and is not easy to describe.

I'm okay with making the doc string more clear, but let's please think
about a more useful amendment.  A doc string should help the user
understand what will/did happen, it shouldn't present puzzles.
This bug report was last modified 4 years and 249 days ago.

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