soderlind/delicious-tagroll-shortcode

<?php
/**
 * Plugin Name: delicious tagroll shortcode
 * Version: 2.2.2
 * Plugin URI: http://www.soderlind.no/archives/2009/11/18/delicious-tagroll-for-wordpress/
 * Description: Adds shortcode "[delicious_tagroll username='username']" which displays a delicious tagroll similar to <a href="http://delicious.com/help/tagrolls">http://delicious.com/help/tagrolls</a>
 * Author: Per Soderlind
 * Author URI: http://www.soderlind.no
 */

if ( defined( 'ABSPATH' ) ) {
    PS_Delicious_Tagroll::instance();
}

class PS_Delicious_Tagroll {
    /**
    * @var string $url The url to this plugin
    */
    var $url = '';
    /**
    * @var string $urlpath The path to this plugin
    */
    var $urlpath = '';

    private $add_script = false;

    private static $instance;
    private $pages_not_in_menu = array();

    public static function instance() {
        if ( self::$instance ) {
            return self::$instance;
        }
        self::$instance = new self();
        return self::$instance;
    }

    private function __construct() {
        // "Constants" setup
        $this->url = plugins_url( basename( __FILE__ ), __FILE__ );
        $this->urlpath = plugins_url( '', __FILE__ );

        // Actions
        add_action( 'wp_footer', array( &$this, 'ps_delicious_tagroll_style' ) ); // Add styles (located at the end of this file).
        add_shortcode( 'delicious_tagroll', array( &$this, 'delicious_tagroll_func' ) );
    }

    function delicious_tagroll_func( $atts ) {
        $atts = shortcode_atts(array(
            'username'   => 'soderlind', // If you forget to add username="yourusername", my delicious tagroll will be shown ;) .
            'title'      => 'My Delicious Tags',
            'count'      => '100',
            'sort'       => 'alpha',
            'mincount'   => '10',
            'showcounts' => 'false',
            'minfont'    => '12',
            'maxfont'    => '35',
            'tags'       => '',
        ), $atts);

        // Do param testing.
        $atts['username']    = urlencode( wp_filter_nohtml_kses( $atts['username'] ) );
        $atts['title']       = wp_filter_nohtml_kses( $atts['title'] );
        $atts['showcounts']  = (strcasecmp( $atts['showcounts'],'true' ) == 0);
        $atts['mincount']    = strval( intval( $atts['mincount'] ) );
        $atts['count']       = strval( intval( $atts['count'] ) );
        $atts['minfont']     = strval( intval( $atts['minfont'] ) );
        $atts['maxfont']     = strval( intval( $atts['maxfont'] ) );
        $atts['sort']        = ('freq' == $atts['sort']) ? 'freq' : 'alpha';
        $arr_tags = (empty( $atts['tags'] )) ? array() : explode( ',',$atts['tags'] );

        $rs = $this->ps_delicious_tagroll_get_tags( $atts['username'],$atts['count'] );

        if ( ! empty( $rs ) ) {
            $tag_cloud = "<div class='ps_delicious_tagroll'>\n";
            if ( '' != $atts['title'] ) {
                $tag_cloud .= sprintf( "<h2>%s</h2>\n",$atts['title'] );
            }

            if ( empty( $rs['item'] ) ) {
                $tag_cloud .= 'Sorry, no items found';
            } else {
                $tag_cloud .= "<ul>\n";
                if ( 'freq' == $atts['sort'] ) {
                    usort( $rs['item'], array( &$this, 'ps_delicious_tagroll_custom_sort_numtags_desc' ) );
                } else {
                    usort( $rs['item'], array( &$this, 'ps_delicious_tagroll_custom_sort_alpha_asc' ) );
                }

                $max = $this->ps_delicious_tagroll_get_max( $rs['item'] );
                $min = $this->ps_delicious_tagroll_get_min( $rs['item'] );

                foreach ( $rs['item'] as $item ) {
                    $btags = ( ! empty( $arr_tags )) ? in_array( $item['title'],$arr_tags ) : true;
                    if ( ($item['description'] >= $atts['mincount']) && $btags ) {
                        $multiplier = ( $atts['maxfont'] - $atts['minfont'] ) / ( $max - $min );
                        $fontsize = $atts['minfont'] + (($max -($max -($item['description'] -$min))) * $multiplier);
                        if ( true === $atts['showcounts'] ) {
                            $tag_cloud .= sprintf( "<li><a style='font-size: %dpx;' href='%s'>%s</a>(%d)</li>\n", $fontsize , $item['guid'], $item['title'],$item['description'] );
                        } else {
                            $tag_cloud .= sprintf( "<li><a style='font-size: %dpx;' href='%s'>%s</a></li>\n", $fontsize , $item['guid'], $item['title'] );
                        }
                    }
                }
                $tag_cloud .= "</ul>\n";
            }
            $tag_cloud .= "</div>\n";
            $this->add_script = true;
            return $tag_cloud;
        } else {
            return "<!-- It's not possible to reach Delicious -->";
        }
    }

    function ps_delicious_tagroll_get_tags( $username = 'soderlind', $count = 10 ) {

        $key = 'delicious_tagroll_' . $username;

        $feed_url = sprintf( 'http://feeds.del.icio.us/v2/rss/tags/%s?count=%s',$username,$count );

        $rs = get_transient( $key );                                    // read "cache"
        if ( false != $rs ) { return $rs; }

        $data  = wp_remote_get( $feed_url.'' );
        if ( is_wp_error( $data ) ) {
            return (array) get_option( $key );                         // retrieve fallback
        } else {
            $body = wp_remote_retrieve_body( $data );

            $xml = new SimpleXMLElement( $body );

            $rs = json_decode( json_encode( $xml->channel ),true );    // convert xml object to array

            if ( count( $rs['item'] ) > 0 ) {
                set_transient( $key, $rs, 60 * 60 );                    //expire after 1 hour
                update_option( $key, $rs );                             //fallback storage
            } else {
                $rs = (array) get_option( $key );                         // retrieve fallback
            }
            return $rs;
        }
    }

    function ps_delicious_tagroll_get_max( $arr ) {
        usort( $arr, array( &$this, 'ps_delicious_tagroll_custom_sort_numtags_desc' ) );
        return $arr[0]['description'];
    }

    function ps_delicious_tagroll_get_min( $arr ) {
        usort( $arr, array( &$this, 'ps_delicious_tagroll_custom_sort_numtags_asc' ) );
        return $arr[0]['description'];
    }

    function ps_delicious_tagroll_custom_sort_numtags_desc( $a, $b ) {
        return $a['description'] < $b['description'];
    }

    function ps_delicious_tagroll_custom_sort_numtags_asc( $a, $b ) {
        return $a['description'] > $b['description'];
    }

    function ps_delicious_tagroll_custom_sort_alpha_asc( $a, $b ) {
        return strcasecmp( $a['title'] ,$b['title'] );
    }

    function ps_delicious_tagroll_style() {
        if ( ! $this->add_script ) {
            return false;
        }
        wp_enqueue_style( 'delicious_tagroll_style',  $this->urlpath . '/delicious-tagroll-shortcode.css' );
    }
} //End Class