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How do I get directory structure into a hash?

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Contributed by filmo on Dec 15, 2002 at 00:07 UTC
Q&A  > directories


I've looked at File::Recurse and File::Find, but they both don't seem to handle sub-directories as I'd like. What I'm looking for is a nested hash of the directory, its files and sub-directories. i.e.
%result = ('top' =>[ file1, file2, file3, subdir1 => [sub_file1, sub_file2], subdir2 => [sub_file3, sub_subDIR =>[sub_sub_file1]], etc... ]);
If the top directory is "home" and one of the subdirectories is 'user1', I would like be able to access the files as
$result{'home'}[0] $result{'home'}{'user1'}[0] $result{'home'}{'user1'}[1], etc

Answer: How do I get directory structure into a hash?
contributed by Aristotle


If you build your own, to avoid the problem merlyn you would probably do something like

$result{home}{"."}[0] $result{home}{user1} $result{home}{user1}{"."}[0]
A starting point:
#!/usr/bin/perl -w use strict; use File::Find; use File::Spec::Functions qw(splitdir); use Data::Dumper; my %hash; find( sub { return if $_ eq '.' or $_ eq '..'; my $cursor = \%hash; $cursor = $cursor->{$_} ||= {} for splitdir $File::Find::dir; -d $_ ? $cursor->{$_} = { "." => [] } : push @{$cursor->{"."}}, $_; }, @ARGV); print Dumper \%hash;
Answer: How do I get directory structure into a hash?
contributed by BrowserUk

To use the test program, supply a path to the script on the command line, but choose a smallish one because Data::Dumper uses prodigious amounts of memory to dump the structure.

The hashdir() function should be portable as far as it goes, but it doesn't check for things like symbolic links, devices etc...

#! perl -slw use strict; use Data::Dumper; sub hashdir{ my $dir = shift; opendir my $dh, $dir or die $!; my $tree = {}->{$dir} = {}; while( my $file = readdir($dh) ) { next if $file =~ m[^\.{1,2}$]; my $path = $dir .'/' . $file; $tree->{$file} = hashdir($path), next if -d $path; push @{$tree->{'.'}}, $file; } return $tree; } my $tree = hashdir( shift ); print Dumper $tree;
Answer: How do I get directory structure into a hash?
contributed by merlyn

$result{'home'}[0] $result{'home'}{'user1'}[0]
That's never gonna work. $result{'home'} cannot be both a hashref and an arrayref.
Answer: How do I get directory structure into a hash?
contributed by filmo

Okay, so my structure is a bit messed up. :O
So how do I get:

$result{'home'}{'file1'} $result{'home'}{'user1'}{'file2'} $result{'home'}{'user1'}{'file3'} $result{'home'}{'user2'}{'subdir'}{'file4'} etc..

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