#!/usr/bin/env perl

use strict;

my $distrib;
my $pkg = shift;
if ($pkg eq '-p') {
    $distrib = 1;
    $pkg = shift;
}
$pkg or die <<USAGE;
Usage: $0 [-p] packagename
	Find the canonical \$VERSION in a module.
	With -p, also create a distribution tarball.
USAGE

# Find the Makefile.PL
(my $dir = $pkg) =~ s/::/-/g;
open IN, "$dir/Makefile.PL" or die "$dir/Makefile.PL: $!";
my ($ver_from) = grep /VERSION_FROM/, <IN>;
close IN;

# Find where our version should come from.
if ($ver_from =~ /VERSION_FROM.*?=>\s*([^,]+)/) {
    # Eval to remove quotes.
    $ver_from = eval qq{$1};
} else {
    die "Can't find VERSION_FROM for $pkg";
}

# Okay, find the version from the $VERSION line.
open IN, "$dir/$ver_from" or die "$dir/$ver_from: $!";
my ($ver) = grep /\$VERSION/, <IN>;
close IN;

if ($ver =~ /VERSION\s*=\s*(\S+)\s*;/) {
    $ver = eval qq{$1};
} else {
    die "No version for $pkg in $ver_from";
}

print STDERR "version = $ver\n";
if ($distrib) {
    # Tidy up and package.
    system "cp -rp $dir $dir-$ver";
    system "cd $dir-$ver; make clean; rm ./*~";
    system "perl -i -pe 's/#VERSION#/$ver/' $dir-$ver/README";
    system "tar czvf $dir-$ver.tgz $dir-$ver";
}