Re: Warnings for unused subs? here's find_unused_subs.pl!

[dada]

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__
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