#!/usr/bin/perl
use strict;

my $F = shift || die "no file specified";

my $xref_cmd = "$^X -MO=Xref,-r $F";

my %subdef;
my %subused;

my @fields = qw( file context line package sigil name action );

open TMP, "$xref_cmd |";
# Xref mangles up filenames, so we need to binmode it
binmode TMP;

while(<TMP>) {
    chomp;
    my %data;
    @data{ @fields } = split( /\s+/ );

    if( $data{action} eq "subdef"
    and $data{package} eq "main"
    and $data{file} eq $F
    ) {
        $subdef{ $data{name} } = "$data{file}:$data{line}";
    }

    if( $data{action} eq "subused"
    and $data{package} eq "main"
    and $data{file} eq $F
    ) {
        $subused{ $data{name} } = "$data{file}:$data{line}";
    }

}
close TMP;

foreach my $sub (keys %subdef) {
    next if exists $subused{ $sub };
    print "$subdef{ $sub } $sub\n";
}


##</code><code>##

__END__
$_=q,just perl,,s, , another ,,s,$, hacker,,print;