* bug#23650: Use of locate-file for directories is underdocumented
@ 2016-05-29 22:44 Nikolay Kudryavtsev
2018-01-31 3:40 ` Noam Postavsky
0 siblings, 1 reply; 2+ messages in thread
From: Nikolay Kudryavtsev @ 2016-05-29 22:44 UTC (permalink / raw)
To: 23650
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Hello.
Let's say I have a list of folders A, B, C. I want to find which one of
them contains subfolder D.
My first idea was using locate-file. While doing so I've found that the
Elisp reference for it is incomplete and confusing:
1. According to the docstring it would only return a directory if
PREDICATE returns 'dir-ok. This is not mentioned in the Elisp reference.
2. The reference suggests file-directory-p as a useful predicate and
this would fail due to 1.
3. It's probably a good idea to mention that there are no bundled
predicates that return dir-ok, and suggest to use a lamda like this:
(lambda (f) (and (file-directory-p f) 'dir-ok)) as a PREDICATE.
Here's a working example, just in case:
(locate-file "Git" '("c:/Program Files/") nil (lambda (f) (and
(file-directory-p f) 'dir-ok)))
--
Best Regards,
Nikolay Kudryavtsev
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^ permalink raw reply [flat|nested] 2+ messages in thread
* bug#23650: Use of locate-file for directories is underdocumented
2016-05-29 22:44 bug#23650: Use of locate-file for directories is underdocumented Nikolay Kudryavtsev
@ 2018-01-31 3:40 ` Noam Postavsky
0 siblings, 0 replies; 2+ messages in thread
From: Noam Postavsky @ 2018-01-31 3:40 UTC (permalink / raw)
To: Nikolay Kudryavtsev; +Cc: 23650
tags 23650 fixed
close 23650 26.1
quit
Nikolay Kudryavtsev <nikolay.kudryavtsev@gmail.com> writes:
> 1. According to the docstring it would only return a directory if
> PREDICATE returns 'dir-ok. This is not mentioned in the Elisp
> reference.
>
> 2. The reference suggests file-directory-p as a useful predicate and
> this would fail due to 1.
>
> 3. It's probably a good idea to mention that there are no bundled
> predicates that return dir-ok, and suggest to use a lamda like this:
> (lambda (f) (and (file-directory-p f) 'dir-ok)) as a PREDICATE.
>
>
> Here's a working example, just in case:
>
> (locate-file "Git" '("c:/Program Files/") nil (lambda (f) (and
> (file-directory-p f) 'dir-ok)))
Added a clarifiction and a similar example (though not one with w32
path) in emacs-26.
[1: f706c59093]: 2018-01-30 22:14:02 -0500
Update manual description of locate-file (Bug#23650)
https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=f706c59093645a6306dd907833d597884e69c0ac
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2018-01-31 3:40 ` Noam Postavsky
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