#! /usr/bin/perl
# -*-Perl-*-
#
# XXX: FIXME: handle multiple '-f logfile' arguments
#
# XXX -- I HATE Perl!  This *will* be re-written in shell/awk/sed soon!
#

# Usage:  log.pl [-u user] [[-m mailto] ...] [-s] [-V] -f logfile 'dirname file ...'
#
#	-u user		- $USER passed from loginfo
#	-m mailto	- for each user to receive cvs log reports
#			(multiple -m's permitted)
#	-s		- to prevent "cvs status -v" messages
#	-V		- without '-s', don't pass '-v' to cvs status
#	-f logfile	- for the logfile to append to (mandatory,
#			but only one logfile can be specified).

# here is what the output looks like:
#
#    From: woods@kuma.domain.top
#    Subject: CVS update: testmodule
#
#    Date: Wednesday November 23, 1994 @ 14:15
#    Author: woods
#
#    Update of /local/src-CVS/testmodule
#    In directory kuma:/home/kuma/woods/work.d/testmodule
#    
#    Modified Files:
#    	test3 
#    Added Files:
#    	test6 
#    Removed Files:
#    	test4 
#    Log Message:
#    - wow, what a test
#
# (and for each file the "cvs status -v" output is appended unless -s is used)
#
#    ==================================================================
#    File: test3           	Status: Up-to-date
#    
#       Working revision:	1.41	Wed Nov 23 14:15:59 1994
#       Repository revision:	1.41	/local/src-CVS/cvs/testmodule/test3,v
#       Sticky Options:	-ko
#    
#       Existing Tags:
#    	local-v2                 	(revision: 1.7)
#    	local-v1                 	(revision: 1.1.1.2)
#    	CVS-1_4A2                	(revision: 1.1.1.2)
#    	local-v0                 	(revision: 1.2)
#    	CVS-1_4A1                	(revision: 1.1.1.1)
#    	CVS                      	(branch: 1.1.1)

use strict;
use IO::File;

my $cvsroot = $ENV{'CVSROOT'};

# turn off setgid
#
$) = $(;

my $dostatus = 1;
my $verbosestatus = 1;
my $users;
my $login;
my $donefiles;
my $logfile;
my @files;

# parse command line arguments
#
while (@ARGV) {
	my $arg = shift @ARGV;

	if ($arg eq '-m') {
		$users = "$users " . shift @ARGV;
	} elsif ($arg eq '-u') {
		$login = shift @ARGV;
	} elsif ($arg eq '-f') {
		($logfile) && die "Too many '-f' args";
		$logfile = shift @ARGV;
	} elsif ($arg eq '-s') {
		$dostatus = 0;
	} elsif ($arg eq '-V') {
		$verbosestatus = 0;
	} else {
		($donefiles) && die "Too many arguments!\n";
		$donefiles = 1;
		@files = split(/ /, $arg);
	}
}

# the first argument is the module location relative to $CVSROOT
#
my $modulepath = shift @files;

my $mailcmd = "| Mail -s 'CVS update: $modulepath'";

# Initialise some date and time arrays
#
my @mos = ('January','February','March','April','May','June','July',
	'August','September','October','November','December');
my @days = ('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday');

my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime;
$year += 1900;

# get a login name for the guy doing the commit....
#
if ($login eq '') {
	$login = getlogin || (getpwuid($<))[0] || "nobody";
}

# open log file for appending
#
my $logfh = new IO::File ">>" . $logfile
	or die "Could not open(" . $logfile . "): $!\n";

# send mail, if there's anyone to send to!
#
my $mailfh;
if ($users) {
	$mailcmd = "$mailcmd $users";
	$mailfh = new IO::File $mailcmd
		or die "Could not Exec($mailcmd): $!\n";
}

# print out the log Header
#
$logfh->print ("\n");
$logfh->print ("****************************************\n");
$logfh->print ("Date:\t$days[$wday] $mos[$mon] $mday, $year @ $hour:" . sprintf("%02d", $min) . "\n");
$logfh->print ("Author:\t$login\n\n");

if ($mailfh) {
	$mailfh->print ("\n");
	$mailfh->print ("Date:\t$days[$wday] $mos[$mon] $mday, $year @ $hour:" . sprintf("%02d", $min) . "\n");
	$mailfh->print ("Author:\t$login\n\n");
}

# print the stuff from logmsg that comes in on stdin to the logfile
#
my $infh = new IO::File "< -";
foreach ($infh->getlines) {
	$logfh->print;
	if ($mailfh) {
		$mailfh->print ($_);
	}
}
undef $infh;

$logfh->print ("\n");

# after log information, do an 'cvs -Qq status -v' on each file in the arguments.
#
if ($dostatus != 0) {
	while (@files) {
		my $file = shift @files;
		if ($file eq "-") {
			$logfh->print ("[input file was '-']\n");
			if ($mailfh) {
				$mailfh->print ("[input file was '-']\n");
			}
			last;
		}
		my $rcsfh = new IO::File;
		my $pid = $rcsfh->open ("-|");
		if ( !defined $pid )
		{
			die "fork failed: $!";
		}
		if ($pid == 0)
		{
			my @command = ('cvs', '-nQq', 'status');
			if ($verbosestatus)
			{
				push @command, '-v';
			}
			push @command, $file;
			exec @command;
			die "cvs exec failed: $!";
		}
		my $line;
		while ($line = $rcsfh->getline) {
			$logfh->print ($line);
			if ($mailfh) {
				$mailfh->print ($line);
			}
		}
		undef $rcsfh;
	}
}

$logfh->close()
	or die "Write to $logfile failed: $!";

if ($mailfh)
{
	$mailfh->close;
	die "Pipe to $mailcmd failed" if $?;
}

## must exit cleanly
##
exit 0;
