# Blosxom Plugin: atomfeed
# Author(s): Rael Dornfest <rael@oreilly.com>
# Version: 2003-12-11
# Blosxom Home/Docs/Licensing: http://www.raelity.org/apps/blosxom/
# Blosxom Plugin Docs: http://www.raelity.org/apps/blosxom/plugin.shtml

package atomfeed;

# --- Configurable variables -----

# Who would you like your feed to credit as the default author of each entry? 
# Leave blank and the atomfeed plugin will attempt to use the whoami and
# fauxami plugins
$default_author = '';

# What domain should Blosxom use in ID tags?
# Leave blank if you don't understand or for Blosxom to use the domain in $url.
$id_domain = '';

# --- Plug-in package variables -----

$author = '';
$T = 'T';
$colon = ':';
$zerozero = '00';

# URL where an atom.css might reside
$css_url = "$blosxom::url/atom.css";

# Try to glean the domain from $url
$id_domain or ($id_domain) = $blosxom::url =~ m#http://(?:www\.)?([^\/]+)#;

# Glean year for feed id
$feed_yr = (gmtime(time))[5] + 1900;

$utc_date = '';

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

sub start {

  # Check for the existence of already-loaded flavour templates or theme
  $blosxom::template{'atom'}{'head'} and return 1;

  # Otherwise, load on-board templates
  _load_templates();

  eval {use XML::Parser; $parser = new XML::Parser;};
  %escape = ('<'=>'&lt;', '>'=>'&gt;', '&'=>'&amp;', '"'=>'&quot;');
  $escape_re  = join '|' => keys %escape;

  1;
}

sub story {
  my($pkg, $path, $filename, $story_ref, $title_ref, $body_ref) = @_;

  my $tz = $ENV{TZ};
  $ENV{TZ} = "GMT";
  my @utc = blosxom::nice_date($blosxom::files{"$blosxom::datadir$path/$filename.$blosxom::file_extension"});
  $ENV{TZ} = $tz;
  $utc_date = "$utc[5]-$utc[2]-$utc[3]T$utc[4]:00Z";
  $utc_yr = $utc[5];

  # Set authorship if available, falling back to $atomfeed::author
  $author = $whoami::fullname || $fauxami::name || $default_author || '';

  if (eval {$parser->parse("<div>$$body_ref</div>")}) {
    $type = 'application/xhtml+xml';
    $mode = 'xml';
    $body = "<div xmlns=\"http://www.w3.org/1999/xhtml\">$$body_ref</div>";
  } else {
    $type = 'text/html';
    $mode = 'escaped';
    if (index($$body_ref,']]>')<0) {
      $body = "<![CDATA[$$body_ref]]>";
    } else {
      ($body = $$body_ref) =~ s/($escape_re)/$escape{$1}/g;
    }
  }
  
  1;
}

sub _load_templates {
  $blosxom::template{'atom'}{'content_type'} = 'application/atom+xml';

  $blosxom::template{'atom'}{'date'} = "\n";

  $blosxom::template{'atom'}{'head'} =<<'HEAD';
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>

<?xml-stylesheet href="$atomfeed::css_url" type="text/css"?>

<feed version="0.3" xmlns="http://purl.org/atom/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">

<title type="text/plain">$blosxom::blog_title</title>
<tagline type="text/plain">$blosxom::blog_description</tagline>
<link rel="alternate" type="text/html" href="$blosxom::url" />
<id>tag$atomfeed::colon$atomfeed::id_domain,$atomfeed::feed_yr$atomfeed::colon/$blosxom::path_info</id>
<generator url="http://blosxom.sourceforge.net/" version="$blosxom::version">Blosxom</generator>
HEAD

  $blosxom::template{'atom'}{'story'} =<<'STORY';
<entry>
<id>tag$atomfeed::colon$atomfeed::id_domain,$atomfeed::utc_yr$atomfeed::colon$path/$fn</id>
<link rel="alternate" type="text/html" href="$blosxom::url$blosxom::path/$blosxom::fn.$blosxom::default_flavour" />
<title type="text/plain">$blosxom::title</title>
<dc:subject>$blosxom::path</dc:subject>
<issued>$atomfeed::utc_date</issued>
<modified>$atomfeed::utc_date</modified>
<author>
  <name>$atomfeed::author</name>
</author>
<content type="$atomfeed::type" xml:base="$blosxom::url" xml:lang="$blosxom::blog_language" xml:space="preserve" mode="$atomfeed::mode">
$atomfeed::body
</content>
</entry>

STORY

  $blosxom::template{'atom'}{'foot'} = "\n</feed>\n";

  1;
}

1;

__END__

=head1 NAME

Blosxom Plug-in: atomfeed

=head1 SYNOPSIS

Provides an Atom feed of your weblog.

The plugin has all you need right on-board, including the appropriate flavour 
template components and a couple-three configuration directives.

Point your browser/Atom feed reader at http://yoururl/index.atom.

=head1 VERSION

2003-12-11

=head1 AUTHOR

Rael Dornfest <rael@oreilly.com>, http://www.raelity.org/
Sam Ruby <sam@intertwingly.net>, http://www.intertwingly.net/
  - contributed the XML::Parser magic

=head1 INSTALLATION

Drop atomfeed into your plugins directory.

=head1 CONFIGURATION

Drop atomfeed into your plugins directory.

All other configuration is optional.

$default_author is where you specify who you'd like to credit as the default
author of each entry.  I say "default" since if you leave it blank it'll 
attempt to use the value provided by the whoami or fauxami plugins if you 
happen to have them installed.

  e.g. $default_author = 'Rael Dornfest';

Atom associates unique ID tags with the feed itself and individual entries.
By default it'll attempt to glean your domain from the specified or calculated
value of $blosxom::url.  But you can override this by setting $id_domain in
the configuration section above.

  e.g. $id_domain = "raelity.org";

Just be sure it's a domain name sans any http://, slashes, extra path bits, 
or what-have-you.

=head1 OTHER PLUGINS

The atomfeed plugin assumes you're not running any fancy interpolation plugin
(e.g. interpolate_fancy) which changes the way variables are specified in a 
template (e.g. <$foo /> rather than $foo).  

If you are running interpolate_fancy or the like--I am--use the config plugin 
and a config.atom file in your blosxom $datadir consisting of:

  $blosxom::plugins{"interpolate_fancy"} = 0;

Where "interpolate_fancy" is the name of the interpolation plugin you're
turning off _just for the atom feed_.

=head1 SEE ALSO

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

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

=head1 BUGS

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

=head1 LICENSE

Blosxom and this Blosxom 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.