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Re: Fail stating a file not in current folder

From: Neil Jerram
Subject: Re: Fail stating a file not in current folder
Date: Wed, 17 Sep 2008 09:59:24 +0100

2008/9/17 zulian jc <address@hidden>:
> Hello guile list,


> I am new to guile and scheme so excuse my poor coding. Anyway I am faced with
> a little problem with guile 1.8.1. I am writing a function that collects all
> sub-directory from a given directory. To do this I am using the opendir and
> readdir functions. However it happens that if I am not cd'ing into the
> directory I want to browse, the following function failed. Is that a normal
> behavior?

Yes, because of what you have suggested...

> (define gather-dirs
>  (lambda (path)
>    ;; with the following line commented out the function will fail browsing
>    ;; directories other than the current one
>    ;;(chdir path)
>    (let ((cdir (opendir path))
>          (l '()))
>      (do ((entry (readdir cdir) (readdir cdir)))
>        ((eof-object? entry) l)
>        (if (directory? entry)
>            (set! l (cons entry l)))))))
> (define directory?
>  (lambda (x)
>    (eq? (stat:type (stat x)) 'directory)))
> Here is the error I get back:
> ERROR: In procedure stat:
> ERROR: No such file or directory: ".bb"
> Note: '.bb' is a folder that exist in the folder I want to browse but not in
> the current one. So basicaly 'readdir' and 'opendir' did their job fine but
> when I am trying to stat on the found entry it fails (in the 'directory?'
> function).
> Investigating further I saw that 'readdir' just return a string with the name
> of the folder entry, that is a name relative to the folder opened
> by 'opendir'. Say I am browsing '/home/bob' folder then readdir will return
> me as an entry "bin" and not "/home/bob/bin". Hence 'stat' is failing if
> there is no 'bin' folder in current folder. Is that correct?
> Now how could one browse a folder and stat on each entry without having to
> change to that folder?

You can use `in-vicinity' to form a relative path name from the
working directory.  Your code above should work if you change the
(directory? entry) call to:

 (directory? (in-vicinity path entry))


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