# Blosxom Plugin: prevnexstory
# Author(s): Barijaona Ramaholimihaso
# Based on chrono_nav plugin by Victor Ganata <aswang@fatoprofugus.net>
# and tree plug-in by Ryan Schram 
# Ideas From: Tatsuhiko Miyagawa 
# Version: 2006-01-01blosxom2
# Documentation: See the bottom of this file or type: perldoc tree

package prevnextstory;


use strict; 
use vars qw($prevlink $nextlink $prevtitle $nexttitle $prevdate $nextdate @file_info @dir_info $files_ref @monthname @monthabbr);
# --- Configuration Variables ---

@monthname = qw/January February March 
                April   May      June 
                July    August   September 
                October November December/ if ($#monthname != 11);
@monthabbr = qw/Jan    Feb       Mar 
                Apr    May       Jun 
                Jul    Aug       Sep  
                Oct    Nov       Dec/ if ($#monthabbr != 11);

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

$prevlink;
$nextlink;
$prevtitle;
$nexttitle;
$prevdate;
$nextdate;
@file_info;
@dir_info;

sub start {
    return 1;
}

sub skip { 
    %$files_ref = %blosxom::files;
    # Take %files and find all the places blosxom will generate a story page. 
    @file_info = sort { $files_ref->{$b} <=> $files_ref->{$a} } keys %$files_ref;
0; 
}



sub head {
    if (($blosxom::path_info =~ /$blosxom::flavour$/) or (($blosxom::path_info =~ /$blosxom::file_extension$/) && ($blosxom::static_or_dynamic eq "static"))) { 
     # It's an individual story file.
       my %path2idx = map { $file_info[$_] => $_ } 0..$#file_info;

       my $key = "$blosxom::datadir/$blosxom::path_info";
       $key =~ s#$blosxom::flavour#$blosxom::file_extension#;
       my $index = $path2idx{"$key"};
       if ($index < $#file_info ){ ($prevlink , $prevtitle, $prevdate) = make_link($index + 1) ;}
			else {undef $prevlink};
       if ($index > 0 ){ ($nextlink , $nexttitle, $nextdate) = make_link($index - 1) ;}
			else {undef $nextlink;};

    }
    elsif (($blosxom::path_info eq "") && ($blosxom::path_info_yr eq "")) {
     # it's the blog main page
       if ($blosxom::num_entries <= $#file_info ){($prevlink, $prevtitle, $prevdate) = make_link($blosxom::num_entries) ;}
			else { undef $prevlink ;};


    }
    else
    {undef $prevlink;
    undef $nextlink;};
1;
}

sub make_link {
    my ($array_index) = @_;
    my $file = $file_info[$array_index];
    my($path, $fn) = $file =~ m!^$blosxom::datadir/(?:(.*)/)?(.*)\.$blosxom::file_extension!;
	my $title='';

    my $fh = FileHandle->new();
    if (-f $file && $fh->open("< $file")) {
	chomp($title = <$fh>);
	$fh->close;
	}
	$path = $path . ( $path ne "" ? "/" : "") ;
	my @date = localtime($files_ref->{$file_info[$array_index]});
    my $mday  = $date[3];
    my $month = $date[4];
    my $year  = $date[5] + 1900;
    
    #here we format the date as a text
	my $datetext = $mday." ".$monthname[$month]." ".$year ;
	return (qq($blosxom::url/$path$fn.$blosxom::flavour), $title, $datetext);
}




1;


__END__

=head1 NAME

Blosxom Plug-in: chrono_nav

=head1 SYNOPSIS

Populates the prevnexstory namespace with links for pointing to preceding 
and following stories (arranged chronologically). I suggest you use it with interpolate_fancy for testing whether $prevnextstory::prevlink and $prevnextstory::nextlink are defined to avoid spurious links to appear when there is no older or fresher story.

=head1 INSTALLATION

Drop this plugin into your plugin directory. Place substitution
variables $prevnextstory::prevlink and $prevnextstory::nextlink in your flavour file as an href value for an anchor element. You can also use $prevnextstory::prevtitle and $prevnextstory::nextlink to get the titles of those stories, and $prevnextstory::prevdate and $prevnextstory::nextdate to get their publication dates. If you need the dates, you will have to adapt the @monthname and @monthabbr lists to your needs, and in some cases modify the formatting performed by the make_list subroutine  (default date format is DD/MM/YYYY, with month names in French).

=head1 VERSION

2005-02-12blosxom2

Version number is the date on which this version of the plug-in was created.

=head2 CHANGES

2006-01-01blosxom2 : take into account the corrections of $path_info in recent versions of blosxom.cgi 

2004-08-22blosxom2 : First published version

=head1 AUTHOR(S)

Barijaona Ramaholimihaso
Based on chrono_nav plugin by Victor Ganata (<aswang@fatoprofugus.net>, http://blog.fatoprofugus.net )
which was itself based on tree plugin by Ryan Schram (http://www.rschram.org)
with inspiration and some code techniques used in prevnextentry from Tatsuhiko Miyagawa (http://www.bulknews.net) 

=head1 SEE ALSO

Blosxom Home/Docs/Licensing: http://blosxom.sourceforge.net

Blosxom Plugin Docs: http://blosxom.sourceforge.net/plugins/

=head1 BUGS

None known; please send bug reports and feedback to the Blosxom development mailing list <blosxom-devel@lists.sourceforge.net>.

=head1 LICENSE

Copyright 2003-2007, Barijaona Ramaholimihaso

Blosxom and config Plug-in
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.