[REBOL] Re: dir?
From: joel:neely:fedex at: 30-Jun-2002 7:16
Hi, Scott and Charles,
G. Scott Jones
wrote:
> From: "Charles"
> > Okay, here's a question regarding the dir? function.
> > Here's a little sample code:
> >
> > root: %/c/somedir/anotherdir/adir/
> > sub: %bdir/
> > foreach dir read join root sub [
> > if (dir? dir) AND (none? find dir "TN-") [
> > etcetcetc
> > ]
> > ]
> >
> > Problem is, when dir is, in fact, a directory, dir? is
> > returning false. I've no idea why, and my only fix around
> > it is to use (dir? rejoin [root sub dir]) ..
> > Shouldn't dir? return true? It has in the past for me in a
> > similar situation... *boggle* Help?
>
> Hi, Charles,
>
> I can more easily offer the fix rather than explain the problem.
> The short answer is that REBOL needs the path. Try:
>
> root: %/c/
> sub: %rebol/
> foreach file read full-path: join root sub [
> if dir? join full-path file [print file]
> ]
>
> Hope this gets you past the hurdle, but I, too, would like to
> more fully understand the distinction.
>
Relative file names always have to be interpreted in the context
of some specific (absolute) directory if we're asking for info
about actual files in the filesystem.
Consider what you'd like REBOL to do if you ask
dir? %temp
Since there is no leading slash, this is a relative file name,
and is interpreted relative to the *current*directory* (i.e.,
the output of WHAT-DIR). Therefore, if I say
foreach filename read %someotherdirectory/ [
if dir? filename [print filename]
]
I'm asking for a list of file names from someotherdirectory and
then checking to see if there's a directory in the current active
directory of the same name.
To get a list of sub-directories within someotherdirectory I must
either "absolutize" the relative file names to someotherdirectory:
for each filename read %someotherdirectory/ [
if dir? join %someotherdirectory/ filename [print filename]
]
or actually change to that directory:
change-dir %someotherdirectory/
foreach filename read %./ [
if dir? filename [print filename]
]
Hope that helps!
-jn-
--
; Joel Neely joeldotneelyatfedexdotcom
REBOL [] do [ do func [s] [ foreach [a b] s [prin b] ] sort/skip
do function [s] [t] [ t: "" foreach [a b] s [repend t [b a]] t ] {
| e s m!zauafBpcvekexEohthjJakwLrngohOqrlryRnsctdtiub} 2 ]
