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bug#46219: 28.0.50; Suboptimal results of `file-relative-name' with mixe
From: |
Eli Zaretskii |
Subject: |
bug#46219: 28.0.50; Suboptimal results of `file-relative-name' with mixed-quoted filenames |
Date: |
Sun, 31 Jan 2021 22:08:29 +0200 |
> From: Philipp Stephani <p.stephani2@gmail.com>
> Date: Sun, 31 Jan 2021 20:26:20 +0100
>
> $ emacs -Q -batch -eval '(progn (princ (file-relative-name "/:/bin/true"
> "/bin")) (terpri) (princ (file-relative-name "/bin/true" "/:/bin")) (terpri))'
> ../:/bin/true
> ../../bin/true
>
> I guess these aren't *technically* wrong, but probably not what's
> intended here. I'd expect a return value of "true" in both cases.
I think your expectations are misplaced. The doc string says:
This function returns a relative file name that is equivalent to FILENAME
when used with that default directory as the default.
So you should use
(file-relative-name "/:/bin/true" "/:/bin")
A useful rule of thumb to remember is that this function treats its
argument as a literal string, it doesn't apply any file-name
semantics.