#!/usr/bin/perl
# vi: expandtab shiftwidth=4:

use strict;
use warnings;

use Getopt::Std;

sub usage {
    print "usage: $0 [-hnr]\n";
    print "\t-h\tPrint this help\n";
    print "\t-n\tPrint commands, don't execute\n";
    print "\t-r\tRemove directories\n";
    exit(1);
}

our ( $opt_r, $opt_n, $opt_h );

my $user_pattern  = '^@user';
my $group_pattern = '^@group';

getopts('hnr')
  or usage();

usage if $opt_h;

if ($<) {
    print "not root, just printing what would be done\n";
    $opt_n = 1;
}

while (<>) {
    chomp;
    if (m/$user_pattern/x) {
        my @token = split /[\s:]/x, $_;
        my $user  = $token[1];
        my @cmd   = ( '/usr/sbin/userdel', "-v", $user );
        print join( ' ', @cmd ), "\n";
        system @cmd unless $opt_n;
    }
    elsif (m/$group_pattern/x) {
        my @token = split /[\s:]/x, $_;
        my $group = $token[1];
        my @cmd   = ( '/usr/sbin/groupdel', "-v", $group );
        print join( ' ', @cmd ), "\n";
        system @cmd unless $opt_n;
    }
    else {
        my $file = $_;
        if ( -d $file ) {
            if ($opt_r) {
                print "delete directory ", $file, "\n";
                rmdir "$file"
                  or warn "error removing directory $file: $!\n";
            }
            else {
                print "keeping directory ", $file, "\n";
            }
        }
        else {
            print "delete file ", $file, "\n";
            unlink $file unless $opt_n;
        }
    }
}