#!/usr/bin/perl -w
# horrible hack of a script to send off a large number of email messages, one after
# each other, all chained together.  This is useful for large numbers of patches.
#
# Use at your own risk!!!!
#
# greg kroah-hartman Jan 8, 2002
# <greg@kroah.com>
#
# GPL v2 (See COPYING)
# 
# Ported to support git "mbox" format files by Ryan Anderson <ryan@michonline.com>
#
# Sends emails to the email listed on the command line.
# 
# updated to give a valid subject and CC the owner of the patch - Jan 2005
# first line of the message is who to CC, 
# and second line is the subject of the message.
# 

use strict;
use warnings;
use Term::ReadLine;
use Mail::Sendmail;
use Getopt::Long;
use Data::Dumper;
use Email::Valid;

# Variables we fill in automatically, or via prompting:
my (@to,@cc,$initial_reply_to,$initial_subject,@files,$from);

# Example of them
# modify these options each time you run the script
#$to = 'torvalds@osdl.org,git@vger.kernel.org';
#$initial_reply_to = ''; #<20050203173208.GA23964@foobar.com>';
#$initial_subject = "[PATCH] Deb package build fixes";
#@files = (qw(
#0001-Make-debian-rules-executable-and-correct-the-spelling-of-rsync-in.txt
#0002-Debian-packages-should-include-the-binaries.txt
#0003-The-deb-package-building-needs-these-two-new-files-to-work-correctly.txt
#));

# change this to your email address.
#$from = "Ryan Anderson <ryan\@michonline.com>";

my $term = new Term::ReadLine 'git-send-email';

# Begin by accumulating all the variables (defined above), that we will end up
# needing, first, from the command line:

my $rc = GetOptions("from=s" => \$from,
                    "in-reply-to=s" => \$initial_reply_to,
		    "subject=s" => \$initial_subject,
		    "to=s" => \@to,
	 );

# Now, let's fill any that aren't set in with defaults:

open(GITVAR,"-|","git-var","-l")
	or die "Failed to open pipe from git-var: $!";

my ($author,$committer);
while(<GITVAR>) {
	chomp;
	my ($var,$data) = split /=/,$_,2;
	my @fields = split /\s+/, $data;

	my $ident = join(" ", @fields[0...(@fields-3)]);

	if ($var eq 'GIT_AUTHOR_IDENT') {
		$author = $ident;
	} elsif ($var eq 'GIT_COMMITTER_IDENT') {
		$committer = $ident;
	}
}
close(GITVAR);


if (!defined $from) {
	$from = $author || $committer;
	1 while (!defined ($_ = $term->readline("Who should the emails appear to be from? ", 
				$from)));
	$from = $_;
	print "Emails will be sent from: ", $from, "\n";
}

if (!@to) {
	1 while (!defined ($_ = $term->readline("Who should the emails be sent to? ", 
				"")));
	my $to = $_;
	push @to, split /,/, $to;
}

if (!defined $initial_subject) {
	1 while (!defined ($_ = 
		$term->readline("What subject should the emails start with? ", 
			$initial_subject)));
	$initial_subject = $_;
}

if (!defined $initial_reply_to) {
	1 while (!defined ($_ = 
		$term->readline("Message-ID to be used as In-Reply-To? ", 
			$initial_reply_to)));
	$initial_reply_to = $_;
}

# Now that all the defaults are set, process the rest of the command line
# arguments and collect up the files that need to be processed.
for my $f (@ARGV) {
	if (-d $f) {
		opendir(DH,$f)
			or die "Failed to opendir $f: $!";

		push @files, map { +$f . "/" . $_ } grep !/^\.{1,2}$/,
			sort readdir(DH);
	} elsif (-f $f) {
		push @files, $f;

	} else {
		print STDERR "Skipping $f - not found.\n";
	}
}

if (@files) {
	print $_,"\n" for @files;
} else {
	print <<EOT;
git-send-email-script [options] <file | directory> [... file | directory ]
Options:
   --from         Specify the "From:" line of the email to be sent.
   --to	          Specify the primary "To:" line of the email.
   --subject      Specify the initial "Subject:" line.
   --in-reply-to  Specify the first "In-Reply-To:" header line.

Error: Please specify a file or a directory on the command line.
EOT
	exit(1);
}

# Variables we set as part of the loop over files
our ($message_id, $cc, %mail, $subject, $reply_to, $message);


# Usually don't need to change anything below here.

# we make a "fake" message id by taking the current number
# of seconds since the beginning of Unix time and tacking on
# a random number to the end, in case we are called quicker than
# 1 second since the last time we were called.
sub make_message_id
{
	my $date = `date "+\%s"`;
	chomp($date);
	my $pseudo_rand = int (rand(4200));
	$message_id = "<$date$pseudo_rand\@foobar.com>";
	print "new message id = $message_id\n";
}



$cc = "";

sub send_message
{
	my %to;
	$to{lc(Email::Valid->address($_))}++ for (@to);

	my $to = join(",", keys %to);

	%mail = (	To	=>	$to,
			From	=>	$from,
			CC	=>	$cc,
			Subject	=>	$subject,
			Message	=>	$message,
			'Reply-to'	=>	$from,
			'In-Reply-To'	=>	$reply_to,
			'Message-ID'	=>	$message_id,
			'X-Mailer'	=>	"git-send-email-script",
		);

	$mail{smtp} = 'localhost';

	#print Data::Dumper->Dump([\%mail],[qw(*mail)]);

	sendmail(%mail) or die $Mail::Sendmail::error;

	print "OK. Log says:\n", $Mail::Sendmail::log;
	print "\n\n"
}


$reply_to = $initial_reply_to;
make_message_id();
$subject = $initial_subject;

foreach my $t (@files) {
	my $F = $t;
	open(F,"<",$t) or die "can't open file $t";

	@cc = ();
	my $found_mbox = 0;
	my $header_done = 0;
	$message = "";
	while(<F>) {
		if (!$header_done) {
			$found_mbox = 1, next if (/^From /);
			chomp;

			if ($found_mbox) {
				if (/^Subject:\s+(.*)$/) {
					$subject = $1;

				} elsif (/^(Cc|From):\s+(.*)$/) {
					printf("(mbox) Adding cc: %s from line '%s'\n",
						$2, $_);
					push @cc, $2;
				}

			} else {
				# In the traditional
				# "send lots of email" format,
				# line 1 = cc
				# line 2 = subject
				# So let's support that, too.
				if (@cc == 0) {
					printf("(non-mbox) Adding cc: %s from line '%s'\n",
						$_, $_);

					push @cc, $_;

				} elsif (!defined $subject) {
					$subject = $_;
				}
			}
			
			# A whitespace line will terminate the headers
			if (m/^\s*$/) {
				$header_done = 1;
			}
		} else {
			$message .=  $_;
			if (/^Signed-off-by: (.*)$/i) {
				my $c = $1;
				chomp $c;
				push @cc, $c;
				printf("(sob) Adding cc: %s from line '%s'\n",
					$c, $_);
			}
		}
	}
	close F;

	my %clean_ccs;
	$clean_ccs{lc(Email::Valid->address($_))}++ for @cc;

	$cc = join(",", keys %clean_ccs);

	send_message();

	# set up for the next message
	$reply_to = $message_id;
	make_message_id();
#	$subject = "Re: ".$initial_subject;
}