bug#68815: Unexpected behavior with read-file-name and functional REQUIRE-MATCH argument

[Joseph Turner]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>>> Also, performance can be a concern (in many cases it makes more sense
>>> to make the caller pass the unquoted name rather than force it to quote
>>> the name only for PRED to unquote it).
>>
>> The REQUIRE-MATCH function is only called once when the user attempts to
>> exit the minibuffer.  Would you please explain the performance concern?
>
> Oh, sorry, I got confused.  Indeed, you're wrapping the REQUIRE-MATCH
> arg, not the PRED arg I was ranting about.  Duh!
>
> It would be OK for `emacs-29`, indeed.  Eli?  Stefan?  Any objection?

Great!  I've CC'd Stefan as well in this email.

> In the mean time, could you update the docs to clarify the behavior.
> E.g. currently the docstring of `read-file-name` says:
>
>     - a function, which will be called with the input as the
>       argument.  [...]
>
> which could be understood to suggest it really receives the contents of
> the minibuffer (i.e. the quoted file name) rather than the value we'd
> extract from it (the unquoted file name).

Please see the attached patch.

Thanks!

Joseph

0001-Pass-unquoted-filename-to-user-supplied-MUSTMATCH-pr.patch
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