bug#21816: elisp-mode-tests fails on a case-preserving filesystem

[Stephen Leake <stephen_leake@stephe-leake.org>]

Stephen Leake <stephen_leake@stephe-leake.org> writes:

> Stephen Leake <stephen_leake@stephe-leake.org> writes:
>
>> Dmitry Gutov <dgutov@yandex.ru> writes:
>>
>>> On 11/03/2015 09:54 PM, Stephen Leake wrote:
>>>
>>>> I'm not clear how to do the case conversion, but I bet Emacs does have
>>>> the right functions.
>>>
>>> I'd expect file-truename to return an appropriate value, but
>>> apparently not.
>>
>> Right. But it does handle symbolic links; is that what we need for a
>> canonical file name? It is what we want for comparing filenames in
>> xrefs, so it at least needs to be an option.
>
> Actually, file-truename works for the cases we've discussed so far:
>
> (file-truename "c:/Projects/emacs/master/lisp/elide-head.el")
> "c:/Projects/emacs/master/lisp/elide-head.el"
>
> (file-truename "c:\\Projects\\emacs\\master\\lisp\\elide-head.el")
> "c:/Projects/emacs/master/lisp/elide-head.el"
>
> (file-truename "c:\\projects\\emacs\\master\\lisp\\elide-head.el")
> "c:/Projects/emacs/master/lisp/elide-head.el"
>
> I did not try a non-ASCII file name; I'm not sure how to construct one
> that has a non-ASCII casing issue.

It even works for non-existing files:

(file-truename "c:\\projects\\emacs\\master\\lisp\\foo")
"c:/Projects/emacs/master/lisp/foo"

--
-- Stephe