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(file-relative-name): Say correctly when the value is absolute.

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Richard M. Stallman 1997-04-11 18:31:38 +00:00
parent d038ca1d37
commit 89c771728b
1 changed files with 7 additions and 2 deletions
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9
lispref/files.texi
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@ -1561,8 +1561,13 @@ variables; only @code{substitute-in-file-name} does that.
@defun file-relative-name filename directory
This function does the inverse of expansion---it tries to return a
relative name that is equivalent to @var{filename} when interpreted
relative to @var{directory}. (If such a relative name would be longer
than the absolute name, it returns the absolute name instead.)
relative to @var{directory}.
On some operating systems, an absolute file name begins with a device
name. On such systems, @var{filename} has no relative equivalent based
on @var{directory} if they start with two different device names. In
this case, @code{file-relative-name} returns @var{filename} in absolute
form.
@example
(file-relative-name "/foo/bar" "/foo/")