#!/usr/bin/perl -wT

# Copyright (c) 2005, 2006, 2007, 2008 Peter Palfrader <peter@palfrader.org>
# Copyright (c) 2007, 2008 Joerg Jaspert <joerg@debian.org>
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.



use strict;
use English;
use MIME::Base64;
use File::Basename;

my $MAX_LINES = 4;
my $ENVELOPE_FROM = 'nobody@commit.noreply.org';
my $HEADER_FROM = 'nobody@commit.noreply.org';
my $BOT_ADDRESS = 'commit@commit.noreply.org';
my $SENDMAIL = '/usr/sbin/sendmail';

$ENV{'PATH'} = '/bin:/usr/bin';
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};

die ("Usage: $PROGRAM_NAME <project> <mailfile>\n") unless (scalar @ARGV == 2);
my $project = $ARGV[0];

umask 077;

$project =~ m/^([a-zA-Z-]+(\.[a-zA-Z-]+)*)+$/;
$project = $1;
die ("Project is not a nice name.\n") unless defined $project;

my $from;
my $rev;
my $who;
my $branch;
my $subdir;
my $timestamp;
my @message;
my $in_message = 0;
my $line_count = 0;

open (MAIL, $ARGV[1]) || die ("Cannot open $ARGV[1]: $!\n");
my @mail = <MAIL>;
close(MAIL);
my $line;


while (defined($line = shift @mail)) {
    my $chomped = $line;
    #print "Looking at $chomped\n";
    chomp $chomped;
    next if length($chomped) <= 2;
    if ($chomped =~ m/^revno: (\d+)/) {
	$rev=$1 unless defined($rev);
	next;
    # Subject: bzr/dsa-nagios/trunk r119: tweaks
    } elsif ($chomped =~ m/Subject: (\S+)/) {
	$subdir = $1;
	$subdir =~ s#.*?/##;
	next;
    } elsif ($chomped =~ m/^committer: (.*)/) {
	$who = $1;
	next;
    } elsif ($chomped =~ m/^branch nick: (.*)/) {
	$branch = $1;
	next;
    } elsif ($chomped =~ m/^timestamp: (.*)/) {
	$timestamp = $1;
	next;
    } elsif ($chomped =~ m/message:/) {
	$in_message = 1;
	next;
    } elsif ($chomped =~ m/^[modified|removed|added]/) {
	$in_message = 0;
	last;
    } elsif ($in_message) {
	$line_count++;
	push @message, $chomped;
	if ($line_count > 3) {
	    push @message, "...";
	    last;
	}
    }
}


die ("$PROGRAM_NAME - $project: No author found.\n") unless defined $who;
die ("$PROGRAM_NAME - $project: No subdir found.\n") unless defined $subdir;


open(MAIL, "|$SENDMAIL -t -oi -f $ENVELOPE_FROM") or
	die ("Cannot exec sendmail: $!\n");
#open(MAIL, "|cat");
print MAIL "From: $HEADER_FROM\n";
print MAIL "To: $BOT_ADDRESS\n";
print MAIL "Subject: Announce $project\n";
print MAIL "Precedence: junk\n";
print MAIL "\n";

if ($branch eq basename($subdir) || ($branch eq dirname($subdir) && basename($subdir) eq 'trunk')) {
    print MAIL "[$subdir] $who committed revision $rev at $timestamp\n";
} else {
    print MAIL "[$subdir] (branch-nick: $branch) $who committed revision $rev at $timestamp\n";
}
foreach (@message) {
    print MAIL "$_\n";
}
close(MAIL);