Config manager: tools/combine-config

#!/usr/bin/perl
use warnings qw(all);
use strict;

use File::Copy qw(copy);
use File::Spec;

my $host = shift;
my $host_re = qr/$host/i;
my %files;

foreach my $path (@ARGV) {
    my (undef, undef, $name) = File::Spec->splitpath($path);
    $name =~ /^(.+)\.([^.]+)$/ or die "Bad file name: $name";
    my ($group, $host) = ($1, $2);

    if ($host =~ /^default$/i) {
        $files{$group}{default} = $path;
    } elsif ($host =~ $host_re) {
        $files{$group}{host} = $path;
    }
}

foreach my $group (sort keys %files) {
    # must run with 5.8, no // operator...
    my $path = defined $files{$group}{host}
        ? $files{$group}{host}
        : $files{$group}{default};
    defined $path or die "BUG: $group applies to us, but doesn't";

    copy($path, *STDOUT);
}