Modify Textpattern plugin, http://www.wilshireone.com/textpattern-plugins/rss-suparchive. Format the excerpt with Textile if appropriate

rss_suparchive.php

// rss_suparchive article listing plugin
// by Rob Sable
// http://www.wilshireone.com
// Version 0.1   - 11/02/2004
// Full revision history at http://www.wilshireone.com/textpattern-plugins/rss-suparchive
// Version 0.16.1 - 01/09/2006 - Fix broken file downloads.  Fix inadvertent date filtering on article pages.
// Version 0.17 - 08/08/06 - Change categories to display title instead of name.
// Version 0.18 - 08/09/06 - Add showcommentscount, showzerocount, countprefix, countsuffix to suparchive and suparchive_bycat.  Change to use strftime for date formatting to allow for localization.  Add wildcard and exclude format for section attribute on all 3 tags. (thanks Andrew).
// 20120301 BW Add ability to decode Textile markup in excerpts. * if other markup is used this probably won't work, but if USE_TEXTILE is false it will return the raw text. See rss_format() below *

register_callback('rss_suparchive_init','pretext');

function rss_suparchive_init() {
  global $attach_titles_to_permalinks;
  $subpath = preg_quote(preg_replace("/http:\/\/.*(\/.*)/Ui","$1",hu),"/");
  $req = preg_replace("/^$subpath/i","/",serverSet('REQUEST_URI'));
  extract(chopUrl($req));

  $f = safe_field('title','txp_section',"name='".doSlash($u1)."'");
  if (!empty($f)) {
    if ($u2 && is_numeric($u2)) $_POST['s'] = $u1;
    if (($u3 && !is_numeric($u3)) || (!$attach_titles_to_permalinks && !$u3)) $_POST['id'] = $u2;
  }
}

function rss_suparchive_menu($atts) {
  global $s, $pretext;
  extract($pretext);

	extract(lAtts(array(
		'section' => "article",
		'linktosection' => $s,
		'timeframe' => "PAST",
		'limit' => 6,
		'showheader' => "0",
		'headerlabel' => "Monthly Archives",
		'headerlevel' => "2",
		'showcount' => "1",
		'countlabel' => "",
		'mode' => "MONTH"
	),$atts));


	foreach (explode(',', $section) as $section)
	{
		switch (substr(trim($section), 0, 1))
		{
			case '*':
				$sctsql[] = " (section like '%') ";
			break;
			case '!':
				$notsctsql[] = " AND (section != '" . doSlash(str_replace('!','',$section)) . "') ";
			break;
			default:
				$sctsql[] = " (section = '" . doSlash($section) . "') ";
			break;
		}
	}
	$sections = ' AND (' . join(' OR ', $sctsql) . @join(' AND ', $notsctsql) . ') ';

  $posted= ($timeframe == "FUTURE") ? " AND Posted >= now() ORDER BY posted asc " : " AND posted < now() ORDER BY posted desc ";
  $posted= isset($posted) ? $posted : " ORDER BY posted desc ";

  $where = "status=4 $sections $posted";
  $res = safe_rows("id, unix_timestamp(posted) as posted","textpattern", $where);


  if( $res ) {
    $dateformat = ($mode == "YEAR") ? "%Y" : "%B %Y";
    $c=-1; $p=0; $lasto="";
    $lastd = safe_strftime($dateformat,$res[0]["posted"]);
    $output[] = ($showheader) ? '<h' .$headerlevel. '>' .$headerlabel. '</h' .$headerlevel. '>'.n : '';
    $output[] = '<ul class="rssMenu">'.n;
    foreach( $res as $a ) {
        $date = safe_strftime($dateformat,$a["posted"]);
        $datelink = ($mode == "YEAR") ? "/".safe_strftime('%Y',$lasto) : "/".safe_strftime('%Y',$lasto)."/".safe_strftime('%m',$lasto);
        $c++;
        $count = ($showcount) ? ' <span class="rssMonthCount">('.$c.$countlabel.')</span>' : '';
        $output[] = ($lastd != $date && $p <= ($limit-1)) ? '<li><a href="'.hu.$linktosection.$datelink.'">'.$lastd.$count.'</a></li>'.n : "";
        if ($p <= ($limit-1)) {
          if ($lastd != $date) { $c=0; $p++; };
          $lastd = $date;
          $lasto = $a["posted"];
        }
    }
    $datelink = ($mode == "YEAR") ? "/".safe_strftime('%Y',$lasto) : "/".safe_strftime('%Y',$lasto)."/".safe_strftime('%m',$lasto);
    $count = ($showcount) ? ' <span class="rssMonthCount">('.($c+1).$countlabel.')</span>' : '';
    $output[] = ($p <= ($limit-1)) ? '<li><a href="'.hu.$linktosection.$datelink.'">'.$lastd.$count.'</a></li>'.n : '';
    $output[] = '</ul>'.n.n;
    return  implode( "", $output);
  }
  return;
}

function rss_suparchive($atts) {

	global $siteurl, $c, $s, $url_mode, $pretext, $thisarticle;
	extract($pretext);

	extract(lAtts(array(
		'section' => "article",
		'category' => isset($nocatfilter) ? "" : $c,
		'author' => gps('author'),
		'dateformat' => "%B %d, %Y",
		'showsection' => "0",
		'showcats' => "0",
		'showauthor' => "0",
		'showexcerpt' => "0",
		'secstart' => "in",
		'catstart' => "under",
		'catsep' => "and",
		'authorsep' => "by",
		'addbreak' => "0",
		'showsubdate' => "0",
		'subdateformat' => "%d",
		'subdatesep' => ": ",
		'limit' => 999999999,
		'form' => "",
		'class' => "",
		'sortby' => "",
		'timeframe' => "PAST",
		'showcommentscount' => "0",
		'showzerocount' => "1",
		'countprefix' => "",
		'countsuffix' => ""
	),$atts));

	$category = doSlash($category);

	foreach (explode(',', $section) as $section)
	{
		switch (substr(trim($section), 0, 1))
		{
			case '*':
				$sctsql[] = " (section like '%') ";
			break;
			case '!':
				$notsctsql[] = " (section != '" . doSlash(str_replace('!','',$section)) . "') ";
			break;
			default:
				$sctsql[] = " (section = '" . doSlash($section) . "') ";
			break;
		}
	}
	$sections = ' AND (' . @join(' OR ', $sctsql) . @join(' AND ', $notsctsql) . ') ';

	foreach (explode(',', $category) as $category) {
		if ($category) $catsql[] = " (category1 = '" . urldecode($category) . "') OR (category2 = '" . urldecode($category) . "')  ";
	}
	$categories= isset($catsql) ? ' AND (' . join(' OR ', $catsql) . ') ' : "";

	foreach (explode(',', $author) as $author) {
		if ($author) $authsql[] = " (authorid = '" . $author . "') ";
	}
	$authors= isset($authsql) ? ' AND (' . join(' OR ', $authsql) . ') ' : "";

	$offsetsql= isset($offset) ? 'LIMIT '.$offset.',9999999999' : "";

	switch ($timeframe) {
		case "FUTURE":
			 $posted = " AND posted >= now() ";
			 break;
		case "PAST":
			 $posted = " AND posted < now() ";
			 break;
		case "ALL":
			 $posted = "";
			 break;
		case "RECENT":
			$posted = " AND posted <= FROM_UNIXTIME(".$prev_posted.")";
			 break;
		case "LATER":
			$posted = " AND posted >= FROM_UNIXTIME(".$next_posted.")";
			 break;
		default:
			$posted = "";
	}

	$orderby= ($timeframe == "FUTURE") ? " ORDER BY posted asc " : " ORDER BY posted desc ";
	$orderby= ($sortby == "RANDOM") ? " ORDER BY rand() " : $orderby ;

	$subpath = preg_quote(preg_replace("/http:\/\/.*(\/.*)/Ui","$1",hu),"/");
	$req = preg_replace("/^$subpath/i","/",serverSet('REQUEST_URI'));
	extract(chopUrl($req));

	$showY = ($u2 != "") ? $u2."-" : "";
	$showM = ($u3 != "") ? $u3."-" : "";
	$showD = ($u4 != "") ? $u4 : "";

	if ($showY && is_numeric($u2) && !$thisarticle) $posted = " AND Posted LIKE '".$showY.$showM.$showD."%' ";

	$where = "status=4 $sections $categories $authors $posted $orderby $offsetsql";

	if ($form) {
		// PAGING INFO
		$total = getCount("textpattern", $where);
		$numPages = ($total > 0 && $limit) ? ceil($total/$limit) : 1;
		$pg = (!$pg) ? 1 : $pg;
		$offset = ($pg - 1) * $limit;

		$pageout['pg']        = $pg;
		$pageout['numPages']  = $numPages;
		$pageout['s']         = $s;
		$pageout['c']         = $c;

		$GLOBALS['thispage'] = $pageout;

		$res = safe_rows("*, unix_timestamp(Posted) as uPosted", "textpattern", $where." LIMIT ".$offset.",".$limit);

		if ($res) {
			foreach($res as $a) {
				extract($a);
				populateArticleData($a);
				$article = fetch('Form', 'txp_form', 'name', $form);
				$articles[] = parse($article);
				// FOR PAGING
				$GLOBALS['uPosted'] = $uPosted;
				$GLOBALS['limit'] = $limit;
				unset($GLOBALS['thisarticle']);
			}
			return join('',$articles);
		}
	}

	if ($limit) $where.= " LIMIT $limit";
	$res = safe_rows("ID, title, authorid, unix_timestamp(Posted) as posted, section, category1, category2, url_title, excerpt, comments_count","textpattern", $where);
	$lastd = safe_strftime($dateformat, -2208988800);
	$count=0;
	$output = array();

	if ($res) {
		$output[] = "<dl";
		$output[] = isset($class) ? " class=\"$class\"" : "";
		$output[] = isset($id) && ($id) ? " id=\"$id\"" : "";
		$output[] = ">";

		foreach($res as $a) {
			$date = safe_strftime($dateformat,$a["posted"]);
			$subdate = safe_strftime($subdateformat,$a["posted"]);
			$title = ($a["url_title"]) ? $a["url_title"]: stripSpace($a["title"]);
			$title = ($url_mode) ? $title : '';
			$showtitle = $a["title"];
			$section = $a["section"];
			$id = $a["ID"];
			$cat1 = $a["category1"];
			$cat2 = $a["category2"];
			$author = $a["authorid"];
			$excerpt = $a["excerpt"];
			$cc = $a["comments_count"];

			if ($showauthor) {
				$authres = safe_row("realname","txp_users", "name='$author'");
				$arealname = $authres["realname"];
			}

			$permlink = permlinkurl($a);
			$sectionlink = ($url_mode) ? urlencode($section) : '?s='.urlencode($section);
			$cslink = ($url_mode) ? urlencode($s) : '?s='.urlencode($s);
			$authorlink = ($url_mode) ? $cslink.'/?author='.urlencode($author) : $cslink.'&amp;author='.urlencode($author);
			$cat1link = ($url_mode) ? $sectionlink.'/?c='.urlencode($cat1) : $sectionlink.'&amp;c='.urlencode($cat1);
			$cat2link = ($url_mode) ? $sectionlink.'/?c='.urlencode($cat2) : $sectionlink.'&amp;c='.urlencode($cat2);

			$cnt = (!$showzerocount && $cc == 0) ? "" : $countprefix.$cc.$countsuffix;
			$commcount = ($showcommentscount) ? '<span class="rssCmntCnt">'.$cnt.'</span>' : '';

			$output[] = ($lastd != $date) ? "<dt>$date</dt>".n : "";
			$output[] = "<dd>";
			$output[] = ($showsubdate == "1") ? '<span class="rssSubdate">'.$subdate.$subdatesep.'</span>' : "";
			$output[] = "<a href=\"$permlink\" title=\"Permanent link to $showtitle\" class=\"rssArticle";
			$output[] = (++$count % 2) ? " rssAlt" : "";
			$output[] = "\">";
			$output[] = "$showtitle</a>";
			$output[] = $commcount;
			$output[] = ($addbreak) ? "<br/>" : "";
			$output[] = ($showauthor) ? " $authorsep <a href=\"$authorlink\" title=\"Link to articles by $author\" class=\"rssAuthor\">$arealname</a> " : "";
			$output[] = ($showsection) ? " $secstart <a href=\"$sectionlink\" title=\"Link to $section section\" class=\"rssSection\">$section</a> " : "";
			$catone = $showcats && $cat1;
			$cattwo = $showcats && $cat2;
			$output[] = ($catone) ? " $catstart <a href=\"$cat1link\" title=\"Link to $cat1\" class=\"rssCat\">".fetch_category_title($cat1)."</a> " : "";
			$output[] = ($cattwo) ? " $catsep <a href=\"$cat2link\" title=\"Link to $cat2\" class=\"rssCat\">".fetch_category_title($cat2)."</a> " : "";
      $output[] = ($showexcerpt) ? "<br/>" . rss_format($excerpt) : "";
			$output[] = "</dd>".n;
			$lastd = $date;
		}
		$output[] = "</dl>";
	}

	return ($output) ? implode('', $output) : '';
}

function rss_suparchive_bycat($atts) {
	global $s, $c, $url_mode, $pretext, $siteurl, $id;

	extract(lAtts(array(
		'section' => "article",
		'showheader' => "0",
		'headerlabel' => "Articles By Category:",
		'showmenu' => "0",
		'showcats' => "1",
		'showcatsonly' => "0",
		'showcatcount' => "1",
		'showsections' => "0",
		'showsectioncount' => "0",
		'showjump' => "0",
		'jumplabel' => "^ back to top",
		'useartcat1' => "0",
		'useartcat2' => "0",
		'useartcats' => "0",
		'limit' => "999999999",
		'timeframe' => "PAST",
		'linktosection' => "",
		'form' => "",
		'formwraptag' => "",
		'addbreak' => "0",
		'showdate' => "0",
		'dateformat' => "%B %d, %Y",
		'datesep' => " &raquo, ",
		'showexcerpt' => "0",
		'showauthor' => "0",
		'authorsep' => "by ",
		'showcommentscount' => "0",
		'showzerocount' => "1",
		'countprefix' => "",
		'countsuffix' => ""
	),$atts));

	$section = isset($section) ? $section : "";
	$linktosection = ($linktosection) ? $linktosection."/" : "";

	if ($useartcat1 || $useartcat2 || $useartcats) {
		$ca = safe_row('category1, category2', 'textpattern', 'id='.$id);
		extract($ca);
	}

	$catsql = ($useartcat1) ? " AND name = '".$category1."' " : "";
	$catsql.= ($useartcat2) ? " AND name = '".$category2."' " : "";

	if ($useartcats) {
	$catsql = " AND (name = '".$category1."' OR name = '".$category2."') ";
	} else {
	if ($c && !$showcatsonly) $catsql = " AND name = '".$c."' ";
	}

	foreach (explode(',', $section) as $section)
	{
		switch (substr(trim($section), 0, 1))
		{
			case '*':
				$sctsql[] = " (section like '%') ";
			break;
			case '!':
				$notsctsql[] = " AND (section != '" . doSlash(str_replace('!','',$section)) . "') ";
			break;
			default:
				$sctsql[] = " (section = '" . doSlash($section) . "') ";
			break;
		}
	}
	$secsql = ($section != null)  ? ' AND (' . join(' OR ', $sctsql) . @join(' AND ', $notsctsql) . ') ' : '';

	$subpath = preg_quote(preg_replace("/http:\/\/.*(\/.*)/Ui","$1",hu),"/");
	$req = preg_replace("/^$subpath/i","/",serverSet('REQUEST_URI'));
	extract(chopUrl($req));

	$showY = ($u2 != "") ? $u2."-" : "";
	$showM = ($u3 != "") ? $u3."-" : "";
	$showD = ($u4 != "") ? $u4 : "";

	$dateposted = ($showY && is_numeric($u3)) ? " AND Posted LIKE '".$showY.$showM.$showD."%' " : " AND posted < now()";

	$q = 'SELECT DISTINCT name FROM '.PFX.'txp_category, '.PFX.'textpattern WHERE name !="default" and type="article" and (category1 = name or category2 = name) '. $catsql.$secsql .'AND status=4 '.$dateposted.' ORDER BY name';
	$rsc = getRows($q,"");

	if ($rsc && $showmenu) {
		foreach($rsc as $r) {
			extract($r);
			$catname = $r["name"];
			$cm[] = '<li><a href="#c_'.stripSpace($catname).'">'.fetch_category_title($catname).'</a></li>'.n;
		}
		$catmenu = '<ul class="rssCatArchiveMenu">'.implode('', $cm).'</ul>'.n;
	}

	$out[] = (!$form) ? '<div id="rssCatArchive">'.n : '';
	$out[] = ($showheader) ? '<div id="rssCatArchiveHeader">'.$headerlabel.'</div>'.n : '';

	$out[] = ($showmenu) ? $catmenu : '';

	$rs = getRows($q,"");

	if ($rs) {
		$out[] = (!$form) ? '<div id="rssCatList">'.n : '';
		$out[] = ($showcatsonly && !$form) ? '<ul>' : '';
		foreach($rs as $a) {
			extract($a);
			$catname = $a["name"];

			switch ($timeframe) {
				case "FUTURE":
					 $posted = " AND posted >= now() ";
					 break;
				case "PAST":
					 $posted = " AND posted < now() ";
					 break;
				case "ALL":
					 $posted = "";
					 break;
				default:
					$posted = "";
			}

			$posted = ($showY && is_numeric($u3)) ? " AND Posted LIKE '".$showY.$showM.$showD."%' " : $posted;

			$noidsql = ($useartcat1 || $useartcat2 || $useartcats) ? "id <> ".$id." AND " : "";
			$scsql = $noidsql. " (category1 = '" . doSlash($catname) . "' or category2 = '" . doSlash($catname) . "')" .$secsql. " AND status=4 $posted ORDER BY section, posted desc";

			$rscnt = safe_rows("*, unix_timestamp(Posted) as uPosted, ID, title, authorid, unix_timestamp(posted) as posted, section, category1, category2, url_title","textpattern", $scsql);
			$catcnt = ($showcats && $showcatcount) ? " (".count($rscnt).") " : "";

			if ($showcatsonly && !$form) {
				$out[] = ($showcats) ? '<li><a href="'.hu.$linktosection.'?c='.urlencode($catname).'" title="View all articles filed under '.$catname.'">'.fetch_category_title($catname).'</a>'.$catcnt.'</li>'.n : '';
			} else  {
				$out[] = ($showcats) ? '<div id="c_'.stripSpace($catname).'" class="rssCcat"><a href="'.hu.$linktosection.'?c='.urlencode($catname).'" title="View all articles filed under '.$catname.'">'.fetch_category_title($catname).'</a>'.$catcnt.'</div>'.n : '';
			}

				if ($form) {
					// PAGING INFO
					$total = getCount("textpattern", $scsql);
					$numPages = ($total > 0 && $limit) ? ceil($total/$limit) : 1;
					$pg = (!$pg) ? 1 : $pg;
					$offset = ($pg - 1) * $limit;

					$pageout['pg']        = $pg;
					$pageout['numPages']  = $numPages;
					$pageout['s']         = $s;
					$pageout['c']         = $c;

					$GLOBALS['thispage'] = $pageout;

					$frmWhere = $scsql." LIMIT ".$offset.",".$limit;
					$res = safe_rows("*, unix_timestamp(Posted) as uPosted", "textpattern", $frmWhere);

					if ($res) {
						foreach($res as $b) {
							extract($b);
							populateArticleData($b);
							$article = fetch('Form', 'txp_form', 'name', $form);
							$articles[] = parse($article);
							// FOR PAGING
							$GLOBALS['uPosted'] = $uPosted;
							$GLOBALS['limit'] = $limit;
							unset($GLOBALS['thisarticle']);
						}
					}
					$out[] = ($formwraptag) ? tag(join('',$articles), $formwraptag) : join('',$articles);
					unset($articles);
			}

			if (!$form) {
				if ($limit) $scsql.= " LIMIT $limit";
				$rs3 = safe_rows("*, unix_timestamp(Posted) as uPosted, ID, title, authorid, unix_timestamp(posted) as posted, section, category1, category2, url_title, comments_count","textpattern", $scsql);
				$lasts = "";
			}

			if ($rs3 && !$showcatsonly && !$form) {
				$out[] = '<ul>'.n;
				foreach($rs3 as $d) {
					$aid= $d["ID"];
					$asection= $d["section"];

					$title = ($d["url_title"]) ? $d["url_title"]: stripSpace($d["title"]);
					$title = ($url_mode) ? $title : '';
					$showtitle = $d["title"];
					$postdate = safe_strftime($dateformat,$d["posted"]);
					$author = $d["authorid"];
					$excerpt = $d["excerpt"];
					$cc = $d["comments_count"];

					$cnt = (!$showzerocount && $cc == 0) ? "" : $countprefix.$cc.$countsuffix;
					$commcount = ($showcommentscount) ? '<span class="rssCmntCnt">'.$cnt.'</span>' : '';

					$authres = safe_row("realname","txp_users", "name='$author'");
					$arealname = $authres["realname"];

					$permlink = permlinkurl($d);

					if ($lasts != $asection && $showsections) {
						$sctcnt = ($showsectioncount) ? " (".count($rs3).")" : "";
						$out[] = '<li><div class="rssCsec">in <a href="'.hu.$asection.'/?c='.$catname.'" title="View articles filed under '.$catname.' in '.$asection.'">'.$asection.'</a>'.$sctcnt.'</div></li>'.n;
						$cnt = 1;
					}

					$out[] = '<li class="rssCart">';
					$out[] = '<a href="'.$permlink.'" title="Permanent link to '.$showtitle.'">'.$showtitle.'</a>';
					$out[] = $commcount;
					$out[] = ($addbreak) ? "<br/>" : "";
					$out[] = ($showauthor) ? $authorsep.$arealname : "";
					$out[] = ($showdate) ? '<span class="rssSubdate">'.$datesep.$postdate.'</span>' : '';
					$out[] = ($showexcerpt) ? "<br/>$excerpt" : "";

					$out[] = '</li>'.n;

					$cnt++;
					$lasts = $asection;
				}
				$out[] = '</ul>'.n;
				$out[] = ($showjump) ? '<div class="rssJump"><a href="#rssCatArchive">'. $jumplabel .'</a></div>' : '';
			}
		}
		$out[] = ($showcatsonly && !$form) ? '</ul>' : '';
		$out[] = (!$form) ? n.'</div>'.n.'</div>'.n : '';
	}
	return ($out) ? implode('', $out) : '';
}

function rss_format($string) {
	global $txpcfg;

	include_once txpath.'/lib/classTextile.php';
	$textile = new Textile();
	return (USE_TEXTILE == true ? $textile->TextileThis($string) : $string);
}