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#!/usr/bin/env perl
=pod
=head1 NAME
bibzbladd.pl - add Zbl numbers to papers in a given bib file
=head1 SYNOPSIS
bibzbladd [B<-o> I<output>] I<bib_file>
=head1 OPTIONS
=over 4
=item B<-o> I<output>
Output file. If this option is not used, the name for the
output file is formed by adding C<_zbl> to the input file
=back
=head1 DESCRIPTION
The script reads a BibTeX file. It checks whether the entries have
Zbls. If now, tries to contact internet to get the numbers. The
result is a BibTeX file with the fields
C<zblnumber=...> added.
The name of the output file is either set by the B<-o> option or
is derived by adding the suffix C<_zbl> to the output file.
=head1 AUTHOR
Boris Veytsman
=head1 COPYRIGHT AND LICENSE
Copyright (C) 2014 Boris Veytsman
This is free software. You may redistribute copies of it under the
terms of the GNU General Public License
L<http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the
extent permitted by law.
=cut
use strict;
use Text::BibTeX;
use Text::BibTeX::Name;
use Getopt::Std;
use URI::Escape;
use LWP::UserAgent;
use TeX::Encode;
my $USAGE="USAGE: $0 [-o output] file\n";
my $VERSION = <<END;
bibzbladd v1.0
This is free software. You may redistribute copies of it under the
terms of the GNU General Public License
http://www.gnu.org/licenses/gpl.html. There is NO WARRANTY, to the
extent permitted by law.
$USAGE
END
my %opts;
getopts('o:hV',\%opts) or die $USAGE;
if ($opts{h} || $opts{V}){
print $VERSION;
exit 0;
}
################################################################
# Defaults and parameters
################################################################
my $inputfile = shift;
my $outputfile = $inputfile;
$outputfile =~ s/\.([^\.]*)$/_zbl.$1/;
if ($opts{o}) {
$outputfile = $opts{o};
}
my $input = new Text::BibTeX::File "$inputfile" or
die "Cannot BibTeX file $inputfile\n";
my $output = new Text::BibTeX::File "> $outputfile" or
die "Cannot write to $outputfile\n";
# Creating the HTTP parameters
my $mirror =
"http://www.zentralblatt-math.org/MIRROR/zmath/en/search/";
my $userAgent = LWP::UserAgent->new;
# Processing the input
while (my $entry = new Text::BibTeX::Entry $input) {
if (!$entry->parse_ok()) {
print STDERR "Cannot understand entry: ";
$entry->print(*STDERR);
print STDERR "Skipping this entry\n";
next;
}
if (!(($entry->metatype() eq BTE_REGULAR))) {
$entry->write($output);
next;
}
if ($entry->exists('zblnumber')) {
$entry->write($output);
next;
}
# Now we have an entry with no Zbl. Let us get to work.
my $zbl = GetZbl($entry, $userAgent, $mirror);
if (length($zbl)) {
$entry->set('zblnumber',$zbl);
}
$entry->write($output);
}
$input->close();
$output->close();
exit 0;
###############################################################
# Getting one Zbl
###############################################################
sub GetZbl {
my $entry=shift;
my $userAgent=shift;
my $mirror=shift;
my @query;
my @names=$entry->names ('author');
if (scalar(@names)) {
foreach my $name (@names) {
my @lastnames = $name->part ('last');
if (scalar(@lastnames)) {
foreach my $lastname (@lastnames) {
push @query, "au:$lastname";
}
}
}
}
if (my $title = $entry->get('title')) {
push @query, "ti:$title";
}
if (my $year = $entry->get('year')) {
push @query, "py:$year";
}
if (my $year = $entry->get('year')) {
push @query, "py:$year";
}
my $type = $entry->type;
if ($type eq 'article') {
push @query, "dt:j";
}
if ($type eq 'book') {
push @query, "dt:b";
}
if ($type eq 'inproceedings' || $type eq 'incollection') {
push @query, "dt:a";
}
my $source = "";
if ($type eq 'article') {
if ($entry->get('journal')) {
$source .= $entry->get('journal');
}
if (my $vol=$entry->get('volume')) {
$source .= ",$vol";
}
if (my $pages=$entry->get('pages')) {
$source .= ",$pages";
}
} else {
if (my $bt=$entry->get('booktitle')) {
$source .= "$bt";
}
}
if ($source) {
push @query, "so:$source";
}
my $qstring = join(" & ", @query);
# print STDERR "$qstring\n";
my $form;
$form->{name}='form';
$form->{q} = $qstring;
$form->{type} = "ascii";
$form->{submit} = 'Search';
my $response = $userAgent->post($mirror, $form);
if ($response->decoded_content =~ /^an:\s*Zbl\s*(\S+)\s*$/m) {
return $1;
} else {
return ("");
}
}
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