Question

make an array of a directory tree/files paths in perl

Asked by: timbo007

I am looking (without installing extra packages) to get an array to have a directory structure  of a bunch of folders then go through each folder and list the files, (and also know the directory its in)

Take the following file paths (starting from 'My Photos' for instance):

/home/tim/my photos/
/home/tim/my photos/journey/1.jpg
/home/tim/my photos/journey/2.jpg
/home/tim/my photos/journey/3.jpg
/home/tim/my photos/birthday/1.jpg
/home/tim/my photos/birthday/2.jpg
/home/tim/my photos/birthday/3.jpg

I would like to find the code that makes me an array of the directorys (recursively) in a given path - in the above example I would like @dirs = ("/home/tim/my photos/journey/" , "/home/tim/my photos/birthday/")

Then I want to get the full file paths into another array...  so @files = ("/home/tim/my photos/journey/1.jpg","/home/tim/my photos/journey/2.jpg", "/home/tim/my photos/journey/3.jpg"....

I know this should be easy but I can't find a straightforward approach, I don't wish to have it rely on other packages as it has to run from different web servers which won't let me install extra packages from CPAN etc.

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Asked On
2009-04-05 at 06:06:00ID24296009
Tags

perl

Topic

Perl Programming Language

Participating Experts
2
Points
250
Comments
5

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Answers

 

by: mrjoltcolaPosted on 2009-04-05 at 06:56:51ID: 24071521

Hope this gets you startred.

#!/usr/bin/perl
 
use strict;
use File::Find;
my @files;
 
find( \&handleFile, '/home' );
 
# Print out sorted list if desired...
#print sort @files;
 
 
sub handleFile() {
 
   if(-d) {
      # Print each file and store into list as we go
      print "$File::Find::name\n";
      push @files, $File::Find::name;
   }
 
}

                                              
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by: WeiXiPosted on 2009-04-05 at 08:26:26ID: 24071745

This works without any extra package. It is rather straight-forward, anyway.

my $root = '/home/tim/my photos';
my @dirs;
my @jpgs;
 
sub recurse {
    my $base = shift;
    push @dirs, $base;
    opendir(my $DIR, $base) || die "can't opendir $base: $!";
    my @dircontents = readdir $DIR;
    closedir $DIR;
    push @jpgs, grep { /\.je?pg$/i && -f $_ } map {"$base/$_"} @dircontents;
    recurse("$base/$_") foreach grep { /[^.]/ && -d "$base/$_" } @dircontents;
}
 
recurse $root;
                                              
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by: timbo007Posted on 2009-04-05 at 09:13:44ID: 24071912

Both answers worked for me, but the first answer by mrjoltcola was easier to implement into my own program. However the second one doesn't use any other packages at all! luckily File::find seems to be installed by default :)

I don't quite understand whats going on the last part of the recurse sub (at row 12) on the second example as that seems outside what I know, do you have the time to elaborate on what it means for me ?

cheers!!

    recurse("$base/$_") foreach grep { /[^.]/ && -d "$base/$_" } @dircontents;
                                              
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by: WeiXiPosted on 2009-04-05 at 09:20:35ID: 24071936

/[^.]/
Match only strings with at least one character that's not a dot. This is to prevent an infinite loop into directory '.'

-d "$base/$_"
Returns true if "$base/$_" is a directory, other wise false.

grep { /[^.]/ && -d "$base/$_" } @dircontents
Filter all entries in the current directory that are directores themselves, but not '.' and '..'

foreach grep { /[^.]/ && -d "$base/$_" } @dircontents
Iterate over all those filtered directories...

recurse("$base/$_") foreach grep { /[^.]/ && -d "$base/$_" } @dircontents;
...and iteratively call the recurse function with the filtered directories as arguments.

 

by: mrjoltcolaPosted on 2009-04-05 at 12:33:54ID: 24072657

Curious why you graded with a B since you did not ask for clarification before closing the question?

20120131-EE-VQP-002

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