#!/usr/local/bin/perl -w -s

eval 'exec /usr/bin/perl -w -s -S $0 ${1+"$@"}'
    if 0; # not running under some shell

our($rs,$fs,$fss);

my $bl = shift or die("usage: $0 [options] Baselang File
  option -fs=..  -rs=.. -fss=..\n");
my $n=1;

$rs ||= '';
$rs =~ s/\\n/\n/g;
$rs =~ s/\\n/\n/g;
$/= $rs;

$fs ||= qr{\s*\n};

$fss ||= qr{\s+};

print "%baselang $bl\n\n";

while(<>){
 next unless /\w/;
 if(/^\%/){
    print ;
    next
 }
 chomp;
 my %r=();
 my $term=undef;
# for $a (split(/\s*\n/,$_)){ 
 for $a (split(/$fs\s*/,$_)){ 
    if   ($a =~ /^($bl)$fss\s*(.*)/){ 
        if ($term and $term ne $2){warn("2 baselang terms ($term,$2)\n");
                   push(@{$r{"SYN-$bl"}}, $2) }
        else {$term=$2;} }
    elsif($a =~ /^(\S+)$fss\s*(.+)/){ push(@{$r{$1}}, $2) } 
    else { warn("???: $a\n") } 
 }

 $term ||="undefined term ".$n++;
 print "\n$term\n";
 for $a (keys %r){
    for ( @{$r{$a}} ){ print("$a $_\n") }
 }
}


__END__

=head1 NAME

tag2thesaurus - transform a tagdictionary into a thesaurus

=head1 SYNOPSIS

 tag2thesaurus baselang tagdictionary

=head1 DESCRIPTION

tag2thesaurus converts tag-format in thesaurus-format

Input file should follow the following tag-format

 lang1  t11
 lang2  t12
 rel ...

 lang1  t21
 lang2  t22
 rel ...

C<tag2thesaurus lang2 file> output looks like:

 %baselang lang2

 t12
 lang1  t11
 rel ...

 t22
 lang1  t21
 rel ...


=head2 Options

 -fs='::'   field separator (def \n)
 -rs='\n'   record separatos (def "\n\n")
 -fss='='   fiels separator2 (def \s+)

Example: if the file has the following format

 L1=v11 :: L2= v21 :: Ln= vn1 
 L1=v12 :: L2= v22 :: Ln= vn2 

the command

 tag2thesaurus -rs='\n' -fs='::' -fss='=' L2 file

would produce thesaurus :

 %baselang L2

 v21
 L1   v11
 Ln   vn1

 v22
 L1   v12
 Ln   vn2

=head2 Errors and Warnings

Each entry must have a term in the baselanguage (otherwise, it is created
one named "undef term 1").

Each entry should have just one term in the baselanguage (the first one
will be taken as the term, the other became C<SYN-baselang> ).

=head1 AUTHOR

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

=head1 SEE ALSO

perl(1).

=cut