#! /tools/ns/bin/perl5.004
# -*- Mode: perl; indent-tabs-mode: nil -*-

# Arguments:
#
# -u <url>   Base URL for the Bonsai directory; "/cvsview2.cgi" will get 
#     appended to this with appropriate args.
# -h <hostname>    Host whose SMTP server we will contact to send mail.
# -s <string>	 String specifying dir and filenames.  As generated by "%s"
#     in a CVSROOT/loginfo file
# -f <file>	A regexp.  If present, then only checkins to files whose
#     name (without the directory) matches the regexp will generate mail.
#
# The remaining args are email addresses of people who should get notified.

use Socket;

sub get_response_code {
    my ($expecting) = @_;
#     if ($flag_debug) {
# 	print STDERR "SMTP: Waiting for code $expecting\n";
#     }
    while (1) {
	my $line = <S>;
# 	if ($flag_debug) {
# 	    print STDERR "SMTP: $line";
# 	}
	if ($line =~ /^[0-9]*-/) {
	    next;
	}
	if ($line =~ /(^[0-9]*) /) {
	    my $code = $1;
	    if ($code == $expecting) {
# 		if ($flag_debug) {
# 		    print STDERR "SMTP: got it.\n";
# 		}
		return;
	    }
	    die "Bad response from SMTP -- $line";
	}
    }
}



my $debug = 0;

my $mailhost = "127.0.0.1";
my $urlbase = "";
my $cvsargs = "";
my $cvsroot = "";
my @mailto;
my $fileregexp = "";


while (@ARGV) {
    my $arg = shift @ARGV;

    if ($arg eq '-d') {
        $debug = 1;
        print STDERR "Debug turned on...\n";
    } elsif ($arg eq '-r') {
        $cvsroot = shift @ARGV;
    } elsif ($arg eq '-h') {
        $mailhost = shift @ARGV;
    } elsif ($arg eq '-u') {
        $urlbase = shift @ARGV;
    } elsif ($arg eq '-s') {
        $cvsargs = shift @ARGV;
    } elsif ($arg eq '-f') {
        $fileregexp = shift @ARGV;
    } else {
        push(@mailto, $arg);
    }
}


my $url = "";
if ($urlbase ne "" && $cvsargs ne "") {
    my @list = split(/ /, $cvsargs);
    my $dir = shift @list;
    if ($fileregexp ne "") {
        if (grep(m/$fileregexp/, @list) <= 0) {
            exit;
        }
    }
    $url = $urlbase . "/cvsview2.cgi?command=DIRECTORY&subdir=$dir&files=" .
        join('+', @list);
}

my $message = "";
while (<>) {
    my $line = $_;
    if ($line =~ m@^Revision/Branch: (.*)$@) {
        if ($url ne "") {
            $url .= "&branch=$1";
        }
    }
    $message .= $line;
}

if ($url ne "") {
    if ($cvsroot ne "") {
        $url .= "&root=$cvsroot";
    }
    $message = "Diffs: $url\n\n" . $message;
}
                


chop(my $hostname = `hostname`);

my ($remote,$port, $iaddr, $paddr, $proto, $line);

$remote = $mailhost;
$port    = 25;
if ($port =~ /\D/) { $port = getservbyname($port, 'tcp') }
die "No port" unless $port;
$iaddr   = inet_aton($remote)               || die "no host: $remote";
$paddr   = sockaddr_in($port, $iaddr);

$proto   = getprotobyname('tcp');
socket(S, PF_INET, SOCK_STREAM, $proto)  || die "socket: $!";
connect(S, $paddr)    || die "connect: $!";
select(S); $| = 1; select(STDOUT);

get_response_code(220);
print S "EHLO $hostname\n";
get_response_code(250);
print S "MAIL FROM: cvsmailfilter@$hostname\n";
get_response_code(250);
foreach $i (@mailto) {
    print S "RCPT TO: $i\n";
    get_response_code(250);
}
print S "DATA\n";
get_response_code(354);
print S "Subject:  $cvsargs\n";
print S "\n";

print S $message . "\n";
print S ".\n";
get_response_code(250);
print S "QUIT\n";
close(S);