read-file-name: resulting file name must satisfy predicate ?

read-file-name: resulting file name must satisfy predicate ?

[Lennart Borgman]

The doc string for `read-file-name' says

    If optional sixth arg predicate is non-nil, possible completions and
    the resulting file name must satisfy (funcall predicate NAME).

However testing with

    (read-file-name "File: " nil nil nil nil (lambda(name) (string-match 
"wantname")))

and entering some characters for the file name and then pressing <RET> 
just seem to return whatever the mini-buffer shows. Maybe this is 
correct. The doc string could be read as "resulting file name from 
completion". But it is in my opinion still unclear and a bit unexpected.

This is on w32. GNU Emacs 22.0.50.1 (i386-mingw-nt5.0.2195) of 2006-03-28.

Re: read-file-name: resulting file name must satisfy predicate ?

[Kevin Rodgers]

Lennart Borgman wrote:
> The doc string for `read-file-name' says
> 
>    If optional sixth arg predicate is non-nil, possible completions and
>    the resulting file name must satisfy (funcall predicate NAME).
> 
> However testing with
> 
>    (read-file-name "File: " nil nil nil nil (lambda(name) (string-match 
> "wantname")))
> 
> and entering some characters for the file name and then pressing <RET> 
> just seem to return whatever the mini-buffer shows. Maybe this is 
> correct. The doc string could be read as "resulting file name from 
> completion". But it is in my opinion still unclear and a bit unexpected.
> 
> This is on w32. GNU Emacs 22.0.50.1 (i386-mingw-nt5.0.2195) of 2006-03-28.

Does it work if you pass the required second arg to string-match:

(read-file-name "File: " nil nil nil nil
                 (lambda (name) (string-match "wantname" name)))

I don't think "resulting from completion" is relevant when MUSTMATCH
(the fourth arg) is nil.

-- 
Kevin Rodgers

Re: read-file-name: resulting file name must satisfy predicate ?

[Lennart Borgman]

Kevin Rodgers wrote:
> Lennart Borgman wrote:
>> The doc string for `read-file-name' says
>>
>>    If optional sixth arg predicate is non-nil, possible completions and
>>    the resulting file name must satisfy (funcall predicate NAME).
>>
>> However testing with
>>
>>    (read-file-name "File: " nil nil nil nil (lambda(name) 
>> (string-match "wantname")))
>>
>> and entering some characters for the file name and then pressing 
>> <RET> just seem to return whatever the mini-buffer shows. Maybe this 
>> is correct. The doc string could be read as "resulting file name from 
>> completion". But it is in my opinion still unclear and a bit unexpected.
>>
>> This is on w32. GNU Emacs 22.0.50.1 (i386-mingw-nt5.0.2195) of 
>> 2006-03-28.
>
> Does it work if you pass the required second arg to string-match:
>
> (read-file-name "File: " nil nil nil nil
>                 (lambda (name) (string-match "wantname" name)))
Oh, sorry. I should train my cut-and-paste. ;-) -- but no.  It is still 
the same behaviour.
>
> I don't think "resulting from completion" is relevant when MUSTMATCH
> (the fourth arg) is nil.
>
Yes, you are right. But do you get the same behaviour as me?