here is a simple, little program called
find_unused_subs.pl:
#!/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";
}
it only works on plain scripts, where subs are in the main package. feel free to enhance it :-)
cheers,
Aldo
__END__
$_=q,just perl,,s, , another ,,s,$, hacker,,print;
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