This is the entire FileCollector base class, btw. I got sick of dealing with the headaches and complexities of tracking individual files and paths and directories. This takes all those headaches away. Basically, the FileCollector scoops up all the files and directories you send it with new and add_resources. Then I use children classes to perform operations on and filter and categorize the files. If it's not reinventing the wheel, I may submit it to CPAN.

package Dondley::WestfieldVote::FileCollector ;
use strict; use warnings;

use Cwd;
use Carp;
use File::Basename;
use Log::Log4perl::Shortcuts qw(:all);

{
  my $iterator;
  sub _file_iterator {
    my @files = @_;
    my $f = sub {
      shift @files;
    };
    return $f;
  }

  sub get_next_file {
    my $s = shift;

    if (!$s->{_selected_file}) {
      my @files = @_ ? @_ : $s->get_files;
      $iterator = _file_iterator(@files) if !$iterator;
    }
    my $next_file = $iterator->();
    $s->{_selected_file} = $next_file;
    $iterator = '' if !$next_file;
    return $next_file;
  }
}

sub AUTOLOAD {
  our $AUTOLOAD;
  my $s = shift;
  $AUTOLOAD  =~ /.*::get(_next)*(_\w+)_files*$/ or
    croak "No such method: $AUTOLOAD";
  my ($next, $type) = ($1, $2);
  my $attr = "${type}_files";
  my @files = @{$s->{$attr}};
  return if !@files || !$next;
  return $s->get_next_file(@files);
}

sub new {
  my $class = shift;

  my $s = bless { _files => {},
                  _target_repo   => '',
                  _selected_file => '',
                  _common_dir    => ''}, $class;
  $s->add_resources(@_);
  return $s;
}

sub get_count {
  my $s = shift;
  return (scalar keys %{$s->{_files}})
}

sub get_obj_prop {
  my $s    = shift;
  my $obj  = shift;
  my $prop = shift;

  if (!$prop || !$obj) {
    $s->croak ("Missing arguments to get_obj_prop method"
      . ' at ' .  (caller(0))[1] . ', line ' . (caller(0))[2] );
  }

  my $file = $s->{_selected_file};

  my $o = $obj . '_obj';
  my $object = $s->{_files}{$file}{$o};
  my $attr = "_$prop";
  if (! exists $object->{$attr} ) {
    $s->croak ("Non-existent $obj object attribute requested: '$prop'"
      . ' at ' .  (caller(0))[1] . ', line ' . (caller(0))[2] );
  }
  my $value = $object->{$attr};
  if (ref $value eq 'ARRAY') {
    return @$value;
  } else {
    return $value;
  }
}

sub set_obj_prop {
  my $s = shift;
  my $obj  = shift;
  my $prop = shift;
  my $val  = shift;

  if (!$prop || !$obj) {
    $s->croak ("Missing arguments to get_obj_prop method"
      . ' at ' .  (caller(0))[1] . ', line ' . (caller(0))[2] );
  }

  my $file = $s->{_selected_file};

  my $o = $obj . '_obj';
  my $object = $s->{_files}{$file}{$o};
  my $attr = "_$prop";
  if (! exists $object->{$attr} ) {
    $s->croak ("Non-existent $obj object attribute requested: '$prop'"
      . ' at ' .  (caller(0))[1] . ', line ' . (caller(0))[2] );
  }

  $object->{$attr} = $val;
}

sub add_obj {
  my ($s, $type, $obj)     = @_;
  my $file                 = $s->{_selected_file};
  my $ot                   = "${type}_obj";
  $s->{_files}{$file}{$ot} = $obj;
}

sub selected_file {
  my $s = shift;
  return $s->{_selected_file};
}

sub has_obj {
  my $s = shift;
  my $type = shift;

  if (!$type) {
    $s->croak ("Missing argument to has method"
      . ' at ' .  (caller(0))[1] . ', line ' . (caller(0))[2] );
  }
  my $file = shift || $s->{_selected_file};
  my $to = "${type}_obj";
  return defined $s->{_files}{$file}{$to};
}

sub get_files {
  my $s = shift;

  my @files = sort keys %{$s->{_files}};
  return @files;
}

sub add_resources {
  my ($s, @resources) = @_;

  foreach my $resource (@resources) {
    _exists($resource);
    $s->_add_file($resource)          if -f $resource;
    $s->_get_file_manifest($resource) if -d $resource;
  }

  $s->_generate_short_names;
}

sub list_files_long {
  my $s = shift;

  my @files = $s->get_files;
  print $_ . "\n" for @files;
}

sub list_files {
  my $s = shift;

  my @files = map { $s->{_files}{$_}{short_path} } keys %{$s->{_files}
+};
  print "\nFiles found in '".$s->{_common_dir}."':\n\n";
  print $_ . "\n" for @files;
}

sub print_short_name {
  my $s = shift;
  print $s->short_name . "\n";
}

sub short_name {
  my $s = shift;
  my $file = $s->{_selected_file};
  $s->{_files}{$file}{short_path};
}

sub _generate_short_names {
  my $s = shift;

  my @files                         = $s->get_files;
  my $file                          = pop @files;
  my @comps                         = split /\//, $file;
  my ($new_string, $longest_string) = '';
  foreach my $cfile (@files) {
    my @ccomps = split /\//, $cfile;
    my $lc     = 0;

    foreach my $comp (@ccomps) {
      if (defined $comps[$lc] && $ccomps[$lc] eq $comps[$lc]) {
        $new_string   .= $ccomps[$lc++] . '/';
        next;
      }
      $longest_string = $new_string;
      @comps          = split /\//, $new_string;
      $new_string     = '';
      last;
    }
  }

  $s->{_common_dir} = $longest_string || (fileparse($file))[1];

  if (@files) {
    foreach my $file ( @files, $file ) {
      $s->{_files}{$file}{short_path} = $file =~ s/$longest_string//r;
    }
  } else {
    $s->{_files}{$file}{short_path} = $file;
  }
}

sub get_filename {
  my $s = shift;
  my $file = $s->{_selected_file} || shift;

  return $s->{_files}{$file}{filename};
}

sub _add_file {
  my ($s, $file) = @_;

  $file = $s->_make_absolute($file);
  $s->{_files}{$file}{full_path} = $file;
  my $filename = (fileparse($file))[0];
  $s->{_files}{$file}{filename} = $filename;
}

sub _make_absolute {
  my ($s, $file) = @_;

  return $file =~ /^\// ? $file : cwd() . "/$file";
}

sub _get_file_manifest {
  my ($s, $dir) = @_;

  opendir (my $dh, $dir) or die "Can't opendir $dir: $!";
  my @dirs_and_files = grep { /^[^\.]/ } readdir($dh);

  my @files = grep { -f "$dir/$_" } @dirs_and_files;
  $s->_add_file("$dir/$_") for @files;

  my @dirs  = grep { -d "$dir/$_" } @dirs_and_files;
  foreach my $tdir (@dirs) {
    opendir (my $tdh, "$dir/$tdir") || die "Can't opendir $tdir: $!";
    $s->_get_file_manifest("$dir/$tdir");
  }

}

sub _exists {
  croak "'$_[0]' does not exist. Aborting." if ! -e $_[0];
}

sub _croak {
  my $msg = shift;
  croak $msg . ' at ' . (caller(1))[1] . ', line ' . (caller(1))[2];
}

sub DESTROY {
}

1; # Magic true value
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