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Revision as of 20:17, 28 May 2007

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LinkStation_General at Yahoo! Groups

GISWiki/RSS

Uses an extension from: http://meta.wikimedia.org/wiki/GISWiki/RSS

RSS-Feed Mediawiki extension

• original by mutante 25.03.2005
• extended by Duesentrieb 30.04.2005
• extended by Rdb78 07.07.2005
• extended by Mafs 10.07.2005, 24.07.2005
• extended by User:Arcy 07.09.2005
• Updated for MediaWiki 1.6 by User:piku 13.06.2006
• Update for Wikicode output, by User:cogdog 14.jul.2006

Requires:

• magpie rss parser http://magpierss.sourceforge.net/
• iconv http://www.gnu.org/software/libiconv/, see also http://www.php.net/iconv

Installation:

• put this file (rss.php) into the extension directory of your mediawiki installation
• add the following to the end of LocalSettings.php: include("extensions/rss.php");
• make sure magpie can be found by PHP.

Usage:

Use one section between <rss>-tags for each feed. The rss section may contain parameters separated by a pipe ("|"), just like links and templates. These parameters are supported:

rss.php

<?php
# RSS-Feed Mediawiki extension
# 
# original by mutante 25.03.2005
# extended by Duesentrieb 30.04.2005
# extended by Rdb78 07.07.2005
# extended by Mafs  10.07.2005, 24.07.2005
# extended by User:Arcy  07.09.2005
# Updated for MediaWiki 1.6 by User:piku 13.06.2006
# Update for Wikicode output, by User:cogdog 14.jul.2006
#
# Requires: 
#  * magpie rss parser <http://magpierss.sourceforge.net/>
#  * iconv <http://www.gnu.org/software/libiconv/>, see also <http://www.php.net/iconv>
#
# Installation:
#  * put this file (rss.php) into the extension directory of your mediawiki installation 
#  * add the following to the end of LocalSettings.php: include("extensions/rss.php");
#  * make sure magpie can be found by PHP.
#
# Usage:
#  Use one section between <rss>-tags for each feed. The rss section may contain parameters
#  separated by a pipe ("|"), just like links and templates. These parameters are supported:
#
#    * charset=...             The charset used by the feed. iconv is used to convert this.
#    * short                   Do not show the description text for each news item.
#    * max=x                   Shows x most recent headlines.
#    * highlight= term1 term2  The terms separated by a space are highlighted.
#    * filter= term1 term2     Show only rss items containing at least one of the terms.
#    * reverse                 display the rss items in reverse order.
#    * title=x                 display an alternative title instead of chanel name.
#    * title = none            dont display any title.
#
# Example: 
#    <rss>http://slashdot.org/slashdot.rss|charset=UTF-8|short|max=5</rss>
#

#change this according to your magpie installation!
require_once('rss_fetch.inc'); 

#install extension hook
$wgExtensionFunctions[] = "wfRssExtension"; 

#extension hook callback function
function wfRssExtension() { 
  global $wgParser;

  #install parser hook for <rss> tags
  $wgParser->setHook( "rss", "renderRss" );
}

#parser hook callback function
function renderRss($input, $argv, $parser = null) {
  if (!$parser) $parser =& $GLOBALS['wgParser'];
  global $wgOutputEncoding;

  $DefaultEncoding = "ISO-8859-1";
  $DisableCache = true;

  # $input = mysql_escape_string($input);

  if (!$input) return ""; #if <rss>-section is empty, return nothing

  #parse fields in rss-section
  $fields= explode("|",$input);
  $url= @$fields[0];

  $args= array();
  for ($i=1; $i<sizeof($fields); $i++) {
    $f= $fields[$i];

    if (strpos($f,"=")===False) $args[strtolower(trim($f))]= False;
    else {
      list($k,$v)= explode("=",$f,2);
      if (trim($v)==False) $args[strtolower(trim($k))] = False; 
      else $args[strtolower(trim($k))]= trim($v);
    }
  }

  #get charset from argument-array    
  $charset= @$args["charset"];
  if (!$charset) $charset= $DefaultEncoding;

  #get max number of headlines from argument-array
  $maxheads = @$args["max"];
  $headcnt = 0;

  #get short-flag from argument-array
  #if short is set, no description text is printed
  if (isset($args["short"])) $short = True; else $short = False;

  #get reverse-flag from argument-array
  if (isset($args["reverse"])) $reverse = True; else $reverse = False;

  #get highlight terms from argument-array    
  $rssHighlight= @$args["highlight"];
  $rssHighlight= str_replace("  "," ", $rssHighlight);
  $rssHighlight= explode(" ", trim($rssHighlight));

  #get filter terms from argument-array    
  $rssFilter= @$args["filter"];
  $rssFilter= str_replace("  "," ", $rssFilter);
  $rssFilter= explode(" ", trim($rssFilter));    

  #fetch rss. may be cached locally.
  #Refer to the documentation of magpie for details.
  $rss = @fetch_rss($url);


  #check for errors.
  if ($rss->ERROR) {
     # return "Feed error"; #localize...
      #return "<div>Failed to load RSS feed from $url: ".$rss->ERROR."</div>"; #localize...
  }

  if (!is_array($rss->items)) {
     # return "Feed error"; #localize...
      #return "<div>Failed to load RSS feed from $url!</div>"; #localize...
  }

  #Bild title line    
  #get title from argument-array    
  
  $rssTitle= @$args["title"];
  $rssTitle= trim($rssTitle);

  if ($rssTitle !=='none') {
    if ($rssTitle=='') {
        $title= iconv($charset,$wgOutputEncoding,$rss->channel['title']);
        if ($rss->channel['link']) $title= "[".$rss->channel['link']." $title]";
        $output = "=== $title ===\n";
    }
    else
    {
      $title= "[".$rss->channel['link']." $rssTitle]";
      $output="=== $title ===\n";
    }
  } else {
      $output="\n\n\n";
  }
  
  if ($reverse) $rss->items = array_reverse($rss->items);

  $description = False; 
  foreach ($rss->items as $item) {
      if ($item['description']) {$description = True; break;}
  }

  #Bild items
  if (!$short and $description) { #full item list

    $output.="";
    foreach ($rss->items as $item) {

      $d_text = true;
      $d_title = true;

      $href = trim(iconv($charset,$wgOutputEncoding,$item['link']));
      $title = trim(iconv($charset,$wgOutputEncoding,$item['title']));

      $d_title = wfRssFilter ($title, $rssFilter);
      $title= wfRssHighlight($title, $rssHighlight);

      #bild description text if desired
      if ($item["description"]) {
        $text= trim(iconv($charset,$wgOutputEncoding,$item['description']));

        #avoid pre-tags
        $text= str_replace("\r"," ",$text);
        $text= str_replace("\n"," ",$text);
        $text= str_replace("\t"," ",$text);

        $d_text = wfRssFilter ($text, $rssFilter);
        $text= wfRssHighlight($text, $rssHighlight);

        $display = $d_text or $d_title;

      }
        else   {
          $text = "";
          $display = $d_title;
        }       

      if ($display) {
        $output.="* [$href $title]";
        if ($text) $output.="<br>$text";
        $output .= "\n";
      }

    #Cut off output when maxheads is reached:
    if (++$headcnt == $maxheads)  break;

    }
    # $output.="</dl>";
  }
  else { #short item list
   #  $output.="<ul>";
    foreach ($rss->items as $item) {
      $href = trim(iconv($charset,$wgOutputEncoding,$item['link']));
      $title = trim(iconv($charset,$wgOutputEncoding,$item['title']));

        $d_title = wfRssFilter ($title, $rssFilter);
        $title= wfRssHighlight($title, $rssHighlight);

        if ($d_title ) $output.="* [$href $title]\n";

      #Cut off output when maxheads is reached:
      if (++$headcnt == $maxheads)  break;
    }
    # $output.="</ul>";
  }


  if ($DisableCache) {

    global $wgVersion;

    # Do not cache this wiki page.
    # for details see http://public.kitware.com/Wiki/User:Barre/MediaWiki/Extensions
    global $wgTitle, $wgDBprefix;
    $ts = mktime();
    $now = gmdate("YmdHis", $ts + 120);
    $ns = $wgTitle->getNamespace();
    $ti = wfStrencode($wgTitle->getDBkey());

    $version = preg_replace("/^([1-9]).([1-9]).*/", "\\1\\2", $wgVersion);
    if ($version>14) $sql = "UPDATE $wgDBprefix"."page SET page_touched='$now' WHERE page_namespace=$ns AND page_title='$ti'";
    else             $sql = "UPDATE $wgDBprefix"."cur SET cur_touched='$now' WHERE cur_namespace=$ns AND cur_title='$ti'";

    wfQuery($sql, DB_WRITE, "");
  }

  $out = $parser->parse ($output, $parser->mTitle,$parser->mOptions, true, false);
  return $out->getText();
}


function wfRssFilter ($text, $rssFilter) {

  $display = true;

  if (is_array($rssFilter)) {
    foreach($rssFilter as $term) {

      if ($term) {
        $display = false;
        if (preg_match("|$term|i", $text, $a))  {  $display = true; return $display; }
      }
    if ($display) break;
    }
  }
  return $display;
}


function wfRssHighlight($text, $rssHighlight) {

  $i=0;
  $starttag = "v8x5u3t3u8h";
  $endtag   = "q8n4f6n4n4x";

  $color[]="coral";
  $color[]="greenyellow";
  $color[]="lightskyblue";
  $color[]="gold";
  $color[]="violet";

  $count_color = count($color);

  if (is_array($rssHighlight)) {
    foreach($rssHighlight as $term) {
      if ($term) {
        $text = preg_replace("|\b(\w*?".$term."\w*?)\b|i", "$starttag"."_".$i."\\1$endtag", $text);
        $i++;
        if ($i == $count_color) $i=0;
        }
      }
    }
  # to avoid trouble should someone wants to highlight the terms "span", "style", ...
  for ($i=0; $i<5; $i++) {
    $text = preg_replace("|$starttag"."_".$i."|", "<span style=\"background-color:".$color[$i]."; font-weight: bold;\">", $text);
    $text = preg_replace("|$endtag|", "</span>", $text);
    }

  return $text;
}

?>