# Blosxom Plugin: meta_date
# Author(s): Robert Hahn <rh-blosxom@tenletters.com> 
#            http://www.tenletters.com/rhahn
# Version: 0+1i
# Documentation: See the bottom of this file or type: perldoc meta_date

package meta_date;

use File::stat;
use Time::localtime;

# --- Configurable variables -----

# Set the timezone offset.

$tz = "-0500";
$showtime = "true";

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

$meta;

%month2num = (nil=>'00', Jan=>'01', Feb=>'02', Mar=>'03', Apr=>'04', May=>'05', Jun=>'06', Jul=>'07', Aug=>'08', Sep=>'09', Oct=>'10', Nov=>'11', Dec=>'12');
sub start {
  1;
}

sub head {
  my($pkg, $currentdir, $head_ref) = @_;
   
   my $mtime, $time;
  if ($currentdir) {
	  if ($currentdir =~ m#(.*?)/?(\w+)\.(\w+)$# and $2 ne 'index') {
		$file = join('/', $blosxom::datadir, $1, "$2.txt");
		$mtime = stat($file)->mtime or print STDERR "meta_date: $!\n";
	  }
  }
  
  ($dw,$mo,$mo_num,$da,$ti,$yr) = nice_date($mtime);
  ($hr,$min) = split /:/, $ti;
  ($hr12, $ampm) = $hr >= 12 ? ($hr - 12,'pm') : ($hr, 'am'); 
  $hr12 =~ s/^0//; $hr12 == 0 and $hr12 = 12;


  if($yr eq "1969" ) {
    $meta = "";
  }else{
    if($showtime eq "true") {
	$time = "$hr:$min $tz";
    }
    $meta = "<meta name=\"Date\" content=\"$yr-$mo_num-$da $time\" />";
  }
}

sub nice_date {
  my($unixtime) = @_;
  
  my $c_time = ctime($unixtime);
  my($dw,$mo,$da,$ti,$yr) = ( $c_time =~ /(\w{3}) +(\w{3}) +(\d{1,2}) +(\d{2}:\d{2}):\d{2} +(\d{4})$/ );
  $da = sprintf("%02d", $da);
  my $mo_num = $month2num{$mo};
  
  return ($dw,$mo,$mo_num,$da,$ti,$yr);
}

1;
__END__
=head1 NAME

Blosxom Plug-in: personLink

=head1 SYNOPSIS

Purpose: After noticing that some Google queries sport a date, I investigated further and found that Google looks for tags like this:

	<meta name="Date" content="2004-01-15" />

This plugin is used to augment your templates by adding in this meta tag for all individual entries.


=head1 PREQUISITES

None.

=head1 DETAILS

This plug-in is designed only for those blogs that are configured to display single posts.  You'll know what I mean if your style of permalinking is not to reference a post with an anchor in the URI, but a link to the post itself.

=head1 CUSTOMIZATION

The meta tag can only really be formatted one way, so the only customization available is to set the timezone, and to allow posting the time of the post.

$tz -- sets the timezone.

The best way to find out your timezone offset is probably to go visit this page: http://timezoneconverter.com/ 

When you conduct a search of your location, you'll be presented with a table of results. In one of the columns, you'll see a field that looks something like this:

  -00:05:00:00

To convert that value into something for this plug-in, remove the first pair of zeros, and all colons.  It'll then look like this:

  -050000

If the last pair of digits are both zeros, they may be omitted:

  -0500

$showtime -- indicates whether you want time info in the meta tag

Allowed values are "1" (for yes) and "0" (for no)


=head1 VERSION

0+1i First Release.

=head1 AUTHOR

Robert Hahn  
  rh-personlink@tenletters.com
  [http://www.tenletters.com/rhahn/]

=head1 SEE ALSO

Blosxom Home/Docs/Licensing: 
  [http://www.raelity.org/apps/blosxom/]

Blosxom Plugin Docs: 
  [http://www.raelity.org/apps/blosxom/plugin.shtml]

Link for this plug-in: 
  [http://www.tenletters.com/rhahn/Internet/Blogging/Blosxom/]

=head1 BUGS

Address bug reports and comments to the Blosxom mailing list 
[http://www.yahoogroups.com/group/blosxom].

=head1 LICENSE

Blosxom
Copyright 2003, Rael Dornfest 

meta_date
Copyright 2004, Robert Hahn

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.