#!/usr/bin/perl -s

use strict;
use warnings;

our ($shape,$h,$r,$of,$t);
my %par=();
my %nodepar=();
my %grel=(NT=>1);        ## graph relations
$par{rankdir}=1    if $h;
$nodepar{shape}=$shape if $shape;
if($r){for(split(/,/,$r)){$grel{$_}=1}}

$of||="png";

use Biblio::Thesaurus;
use GraphViz;

my $filename = shift;
my $the = thesaurusLoad($filename);

my $TERMS;
my $NTS;

$the->downtr( { -default => sub {            ## term rel @terms
                    return if $rel eq "SN";
                    $TERMS->{$term}++;
                    if (defined $grel{$rel}) {
                        for (@terms) {
                            my $ttt = $_ || "??";
                            next if (defined $t and $t ne $term or $t ne $ttt); 
                            push @$NTS, [$term,  $ttt];
                        }
                    }
                }
              });

my $g = GraphViz->new(%par);
#my $i = 0;
#
#for (keys %$TERMS) {
#    $i++;
#    $g->add_node("ID$i", label => $_,%nodepar);
#    $TERMS->{$_} = "ID$i";
#}

for my $ramo (@$NTS) {
    $g->add_edge($TERMS->{$ramo->[0]},
                 $TERMS->{$ramo->[1]});
}

print $g->as_png  if $of eq "png";
print $g->as_svg  if $of eq "svg";
print $g->as_text if $of eq "text";
print $g->as_ps   if $of eq "ps";
print $g->as_imap if $of eq "imap";


__END__

=head1 NAME

thesaurus2graphviz - draw a biblio::thesaurus graph

=head1 SYNOPSIS

 thesaurus2graphviz [-shape=... -h] file.the > _.png

=head1 DESCRIPTION

=head2 Option

 -h        Horizontal mode (-rankdir=1 from graphviz)

 -shape=circle   ('record', 'plaintext', 'ellipse', 'circle', 'egg', 
       'triangle', 'box', 'diamond', 'trapezium', 'parallelogram', 'house', 
       'hexagon', 'octagon')

 -r=INST,PART      graph relation = {NT, INST, PART }
        default graph relation = {NT}

 -of=svg   output format (def:png)

 -t=term   show only "term" and his neighbours

=head1 AUTHOR

Albero Simoes

J.Joao Almeida, jj@di.uminho.pt

=head1 SEE ALSO

perl(1).

=cut