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# ABSTRACT: manually pretty print a directory, recursively
# This example shows a manual walker and descender. It is inferior
# to the prety_print_a_directory_using_callbacks* scripts, and takes
# more time/effort/code. This example script is limited: it can
# only walk single top-level directories-- moral of the story: using
# callbacks is the clearly superior option.
#
# This example is here less for exhibition as a good example, and
# much more for exhibition about how not-to-walk directories. Take
# a look at the other examples instead ;-)
# set this to the name of the directory to pretty-print
my $treetrunk = '/tmp';
use strict;
use warnings;
use File::Util qw( NL );
my $indent = '';
my $ftl = File::Util->new();
my $opts = {
with_paths => 1,
sl_after_dirs => 1,
no_fsdots => 1,
as_ref => 1,
onfail => 'zero'
};
my $filetree = {};
my( $subdirs, $sfiles ) = $ftl->list_dir( $treetrunk => $opts );
$filetree = [{
$treetrunk => [ sort { uc $a cmp uc $b } @$subdirs, @$sfiles ]
}];
descend( $filetree->[0]{ $treetrunk }, scalar @$subdirs );
walk( @$filetree );
exit;
sub descend {
my( $parent, $dirnum ) = @_;
for ( my $i = 0; $i < $dirnum; ++$i ) {
my $current = $parent->[ $i ];
next unless -d $current;
my( $subdirs, $sfiles ) = $ftl->list_dir( $current => $opts );
map { $_ = $ftl->strip_path( $_ ) } @$sfiles;
splice @$parent, $i, 1,
{ $current => [ sort { uc $a cmp uc $b } @$subdirs, @$sfiles ] };
descend( $parent->[$i]{ $current }, scalar @$subdirs );
}
return $parent;
}
sub walk {
my $dir = shift @_;
foreach ( @{ [ %$dir ]->[1] } ) {
my $mem = $_;
if ( ref $mem eq 'HASH' ) {
print $indent . $ftl->strip_path([ %$mem ]->[0]) . '/', NL;
$indent .= ' ' x 3; # increase indent
walk( $mem );
$indent = substr( $indent, 3 ); # decrease indent
} else { print $indent . $mem, NL }
}
}
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