—

              
package App::MARC::List;
use strict;
use warnings;
use Class::Utils qw(set_params);
use English;
use Error::Pure qw(err);
use Getopt::Std;
use List::MoreUtils qw(uniq);
use List::Util qw(max);
use MARC::File::XML (BinaryEncoding => 'utf8', RecordFormat => 'MARC21');
use Unicode::UTF8 qw(decode_utf8 encode_utf8);
our $VERSION = 0.07;
# Constructor.
sub new {
        my ($class, @params) = @_;
        # Create object.
        my $self = bless {}, $class;
        # Process parameters.
        set_params($self, @params);
        # Object.
        return $self;
}
# Run.
sub run {
        my $self = shift;
        # Process arguments.
        $self->{'_opts'} = {
                'f' => 0,
                'h' => 0,
        };
        if (! getopts('fh', $self->{'_opts'})
                || $self->{'_opts'}->{'h'}
                || @ARGV < 2) {
                print STDERR "Usage: $0 [-f] [-h] [--version] marc_xml_file field [subfield]\n";
                print STDERR "\t-f\t\tPrint frequency.\n";
                print STDERR "\t-h\t\tPrint help.\n";
                print STDERR "\t--version\tPrint version.\n";
                print STDERR "\tmarc_xml_file\tMARC XML file.\n";
                print STDERR "\tfield\t\tMARC field (field number or 'leader' string).\n";
                print STDERR "\tsubfield\tMARC subfield (for datafields).\n";
                return 1;
        }
        $self->{'_marc_xml_file'} = shift @ARGV;
        $self->{'_marc_field'} = shift @ARGV;
        $self->{'_marc_subfield'} = shift @ARGV;
        if ($self->{'_marc_field'} ne 'leader'
                && $self->{'_marc_field'} !~ m/^\d+$/ms) {
                err "Bad field definition. Must be a 'leader' or numeric value of the field.";
        }
        if ($self->{'_marc_field'} ne 'leader'
                && int($self->{'_marc_field'}) > 9
                && ! defined $self->{'_marc_subfield'}) {
                err 'Subfield is required.';
        }
        my $marc_file = MARC::File::XML->in($self->{'_marc_xml_file'});
        my $ret_hr = {};
        my $num = 1;
        my $previous_record;
        while (1) {
                my $record = eval {
                        $marc_file->next;
                };
                if ($EVAL_ERROR) {
                        print STDERR "Cannot process '$num' record. ".
                                (
                                        defined $previous_record
                                        ? "Previous record is ".encode_utf8($previous_record->title)."\n"
                                        : ''
                                );
                        print STDERR "Error: $EVAL_ERROR\n";
                        next;
                }
                if (! defined $record) {
                        last;
                }
                $previous_record = $record;
                if ($self->{'_marc_field'} eq 'leader') {
                        my $leader = $record->leader;
                        $ret_hr->{"'".$leader."'"}++;
                } else {
                        my @fields = $record->field($self->{'_marc_field'});
                        foreach my $field (@fields) {
                                if (defined $self->{'_marc_subfield'}) {
                                        my @subfield_values = $field->subfield($self->{'_marc_subfield'});
                                        foreach my $subfield_value (@subfield_values) {
                                                $ret_hr->{$subfield_value}++;
                                        }
                                } else {
                                        my $data = $field->data;
                                        $ret_hr->{$data}++;
                                }
                        }
                }
                $num++;
        }
        # Print out.
        if (%{$ret_hr}) {
                if ($self->{'_opts'}->{'f'}) {
                        my $max = max(values %{$ret_hr});
                        my $num = length($max);
                        print join "\n",
                                map { sprintf("%${num}s", $ret_hr->{$_}).' '.encode_utf8($_) }
                                reverse sort {
                                        $ret_hr->{$a} <=> $ret_hr->{$b}
                                        ||
                                        $a cmp $b
                                }
                                keys %{$ret_hr};
                } else {
                        print join "\n", map { encode_utf8($_) } sort keys %{$ret_hr};
                }
                print "\n";
        }
         
        return 0;
}
1;
__END__
HideShow 234 lines of Pod
=pod
=encoding utf8
=head1 NAME
App::MARC::List - Base class for marc-list script.
=head1 SYNOPSIS
 use App::MARC::List;
 my $app = App::MARC::List->new;
 my $exit_code = $app->run;
=head1 METHODS
=head2 C<new>
 my $app = App::MARC::List->new;
Constructor.
Returns instance of object.
=head2 C<run>
 my $exit_code = $app->run;
Run.
Returns 1 for error, 0 for success.
=head1 ERRORS
 new():
         From Class::Utils::set_params():
                 Unknown parameter '%s'.
 run():
         Bad field definition. Must be a 'leader' or numeric value of the field.
         Subfield is required.
=head1 EXAMPLE
=for comment filename=list_cnb_ids_from_example_marc.pl
 use strict;
 use warnings;
 use App::MARC::List;
 use IO::Barf qw(barf);
 use File::Temp qw(tempfile);
 use MIME::Base64;
 # Content.
 my $marc_xml_example = <<'END';
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 END
 my ($temp_file, $temp_file_fh) = tempfile();
 barf($temp_file_fh, decode_base64($marc_xml_example));
 # Arguments.
 @ARGV = (
         $temp_file,
         '015',
         'a',
 );
 # Run.
 exit App::MARC::List->new->run;
 # Output:
 # cnb000000096
 # cnb000000098
=head1 DEPENDENCIES
L<Class::Utils>,
L<English>,
L<Error::Pure>,
L<Getopt::Std>,
L<List::MoreUtils>
L<MARC::File::XML>
L<Unicode::UTF8>.
=head1 REPOSITORY
L<https://github.com/michal-josef-spacek/App-MARC-List>
=head1 AUTHOR
Michal Josef Špaček L<mailto:skim@cpan.org>
L<http://skim.cz>
=head1 LICENSE AND COPYRIGHT
© 2022-2025 Michal Josef Špaček
BSD 2-Clause License
=head1 VERSION
0.07
=cut