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Re: [PATCH] Add "scandir" procedure
From: |
Andy Wingo |
Subject: |
Re: [PATCH] Add "scandir" procedure |
Date: |
Sat, 10 Dec 2011 16:37:44 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.3 (gnu/linux) |
Heya,
On Sat 10 Dec 2011 15:52, address@hidden (Ludovic Courtès) writes:
> Andy Wingo <address@hidden> skribis:
>
>> On Tue 30 Aug 2011 18:06, address@hidden (Ludovic Courtès) writes:
>>
>>> I was actually planning to push ‘file-system-fold’, a functional
>>> alternative to ‘ftw’, which would be along the lines of this (from
>>> <http://git.savannah.gnu.org/cgit/libchop.git/tree/utils/chop-backup#n46>):
>>>
>>> (define (file-system-fold enter? leaf down up skip init file-name)
>>> "Traverse the directory at FILE-NAME, recursively. Enter
>>> sub-directories
>>> only when (ENTER? PATH STAT RESULT) returns true. When a sub-directory is
>>> entered, call (DOWN PATH STAT RESULT), where PATH is the path of the
>>> sub-directory and STAT the result of (lstat PATH); when it is left, call
>>> (UP
>>> PATH STAT RESULT). For each file in a directory, call (LEAF PATH STAT
>>> RESULT). Return the result of these successive applications. When ENTER?
>>> returns no, call (SKIP PATH STAT RESULT)."
>>>
>>> ...)
>>
>> I see that you haven't pushed this yet. Want to do so?
>
> Yes, I’m looking into this now.
>
> I was planning to make it part of (ice-9 ftw); WDYT?
Sounds fine to me. I didn't take a close look at the implementation,
but the idea of the function sounded sane to me.
>> I would be happy with a `scandir' implementation on top of this
>> interface.
>
> Yes. The mixture of concerns in that function is not brilliant, but
> OTOH it’s probably good to have a function people are familiar with.
Yeah, I have the same thoughts. OTOH, if file-system-fold goes into
(ice-9 ftw), where would a `scandir' go? There also? I guess that's
OK.
Just thinking out loud :)
Happy hacking,
Andy
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