# Blosxom Plugin: blosxom_anacron
# Author(s): Fletcher T. Penney <http://fletcher.freeshell.org/> 
# Version: 0.1
package blosxom_anacron;

# This plugin performs a similar purpose as the anacron utility
# It reads the anacrontab file which specifies commands and 
# how frequently they should be run.
# When a blosxom page is loaded, the plugin checks to see if any commands
# are overdue to be run, and if so, runs them. 

# --- Configurable variables -----

# anacron_tab is the file that you need to prepare.  The format consists
# of the command to be run, followed by "=>" followed by the interval
# in seconds.
#
# For example:
# /path/to/command=>86400
# 'command' will be run every 24 hours

$anacron_tab = "$blosxom::plugin_state_dir/anacrontab";

# This file stores the timestamps of the last time a command was run
# This file is created automatically.
$anacron_timestamp = "$blosxom::plugin_state_dir/anacronstamp";

# --------------------------------


sub start {
	my %interval = ();
	my %lastrun = ();
	my $now = time();
	my $last = 0;

	if (open (CRON, "<$anacron_tab")) {
		while ($line = <CRON> ) {
			if ($line =~ /(.*)=>\s*(\d+)/) {
				$interval{$1}=$2;
			}
		}
		close CRON;
		
		if (open (LAST, "<$anacron_timestamp")) {
			while ($line= <LAST>) {
				if ($line =~ /(.*)=>(.*)/) {
					$lastrun{$1}=$2;
				}
			}
			close LAST;
		}
		
		open (LAST, ">$anacron_timestamp");
		
		foreach $job (sort (keys %interval)) {
			$last = $lastrun{$job};
			if (($last == 0) || (( $last + $interval{$job}) lt $now )) {
				system($job);
				$lastrun{$job} = $now;
			}
			
			print LAST "$job=>$lastrun{$job}\n";
		}
		
		close LAST;
	}
}

1;

__END__

=head1 NAME

Blosxom Plug-in: blosxom_anacron

=head1 SYNOPSIS

The blosxom_anacron plugin provide a built-in "anacron" like function into 
blosxom.  Basically, it runs specified commands after a given interval has 
elapsed since the last time that command was performed.

=head1 VERSION

0.1

=head1 VERSION HISTORY

0.1		Initial public release


=head1 AUTHOR

Fletcher T. Penney

=head1 BUGS


=head1 LICENSE

blosxom_anacron plugin
Copyright 2003, Fletcher Penney

Blosxom Copyright 2003, Rael Dornfest 

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.