First commit: Addon for shortening long content and "show more" link.

showmore/README

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+Show more
+
+Shortens messages and offers a link to show more.

showmore/showmore.css

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+
+#showmore-label, #showmore-enable-label {
+	float: left;
+	width: 300px;
+	margin-top: 10px;
+}
+
+#showmore-words, #showmore-enable {
+	float: left;
+	margin-top: 10px;
+}
+
+#showmore-submit {
+	margin-top: 15px;
+}
+
+.showmore-desc {
+	margin-top: 10px;
+}

showmore/showmore.php

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+<?php
+/**
+ * Name: Show More
+ * Description: Collapse posts
+ * Version: 1.0
+ * Author: Michael Vogel <ike@piratenpartei.de>
+ *         based upon NSFW from Mike Macgirvin <http://macgirvin.com/profile/mike>
+ *
+ */
+
+function showmore_install() {
+	register_hook('prepare_body', 'addon/showmore/showmore.php', 'showmore_prepare_body');
+	register_hook('plugin_settings', 'addon/showmore/showmore.php', 'showmore_addon_settings');
+	register_hook('plugin_settings_post', 'addon/showmore/showmore.php', 'showmore_addon_settings_post');
+}
+
+function showmore_uninstall() {
+	unregister_hook('prepare_body', 'addon/showmore/showmore.php', 'showmore_prepare_body');
+	unregister_hook('plugin_settings', 'addon/showmore/showmore.php', 'showmore_addon_settings');
+	unregister_hook('plugin_settings_post', 'addon/showmore/showmore.php', 'showmore_addon_settings_post');
+}
+
+function showmore_addon_settings(&$a,&$s) {
+
+	if(! local_user())
+		return;
+
+	/* Add our stylesheet to the page so we can make our settings look nice */
+
+	$a->page['htmlhead'] .= '<link rel="stylesheet" type="text/css" href="'.$a->get_baseurl().'/addon/showmore/showmore.css'.'" media="all"/>'."\r\n";
+
+	$enable_checked = (intval(get_pconfig(local_user(),'showmore','disable')) ? '' : ' checked="checked"');
+	$chars = get_pconfig(local_user(),'showmore','chars');
+	if(!$chars)
+		$chars = '1100';
+
+	$s .= '<div class="settings-block">';
+	$s .= '<h3>' . t('"Show more" Settings').'</h3>';
+	$s .= '<div id="showmore-wrapper">';
+
+	$s .= '<label id="showmore-enable-label" for="showmore-enable">'.t('Enable Show More').'</label>';
+	$s .= '<input id="showmore-enable" type="checkbox" name="showmore-enable" value="1"'.$enable_checked.' />';
+	$s .= '<div class="clear"></div>';
+	$s .= '<label id="showmore-label" for="showmore-chars">'.t('Cutting posts after how much characters').' </label>';
+	$s .= '<input id="showmore-words" type="text" name="showmore-chars" value="'.$chars.'" />';
+	$s .= '</div><div class="clear"></div>';
+
+	$s .= '<div class="settings-submit-wrapper" ><input type="submit" id="showmore-submit" name="showmore-submit" class="settings-submit" value="' . t('Submit') . '" /></div>';
+//	$s .= '<div class="showmore-desc">' . t('Use /expression/ to provide regular expressions') . '</div></div>';
+
+	return;
+}
+
+function showmore_addon_settings_post(&$a,&$b) {
+
+	if(! local_user())
+		return;
+
+	if($_POST['showmore-submit']) {
+		set_pconfig(local_user(),'showmore','chars',trim($_POST['showmore-chars']));
+		$enable = ((x($_POST,'showmore-enable')) ? intval($_POST['showmore-enable']) : 0);
+		$disable = 1-$enable;
+		set_pconfig(local_user(),'showmore','disable', $disable);
+		info( t('Show More Settings saved.') . EOL);
+	}
+}
+
+function showmore_prepare_body(&$a,&$b) {
+
+	$words = null;
+	if(get_pconfig(local_user(),'showmore','disable'))
+		return;
+
+	$chars = (int)get_pconfig(local_user(),'showmore','chars');
+	if(!$chars)
+		$chars = 1100;
+
+	if (strlen(strip_tags(trim($b['html']))) > $chars) {
+		$found = true;
+		$shortened = trim(showmore_cutitem($b['html'], $chars))."...";
+	}
+
+	if($found) {
+		$rnd = random_string(8);
+		$b['html'] = '<span id="showmore-teaser-'.$rnd.'" style="display: block;">'.$shortened." ".
+				'<span id="showmore-wrap-'.$rnd.'" style="white-space:nowrap;" class="fakelink" onclick="openClose(\'showmore-'.$rnd.'\'); openClose(\'showmore-teaser-'.$rnd.'\');" >'.sprintf(t('Show More')).'</span></span>'.
+				'<div id="showmore-'.$rnd.'" style="display: none;">'.$b['html'].'</div>';
+	}
+}
+
+function showmore_cutitem($text, $limit) {
+	$text = trim($text);
+
+	$text = mb_convert_encoding($text, 'HTML-ENTITIES', "UTF-8");
+
+	$text = substr($text, 0, $limit);
+
+	$pos1 = strrpos($text, "<");
+	$pos2 = strrpos($text, ">");
+	$pos3 = strrpos($text, "&");
+	$pos4 = strrpos($text, ";");
+
+	if ($pos1 > $pos3) {
+		if ($pos1 > $pos2)
+			$text = substr($text, 0, $pos1);
+	} else {
+		if ($pos3 > $pos4)
+			$text = substr($text, 0, $pos3);
+	}
+
+	$doc = new DOMDocument();
+	$doc->preserveWhiteSpace = false;
+
+	$doctype = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">';
+	@$doc->loadHTML($doctype."<html><body>".$text."</body></html>");
+
+	$text = $doc->saveHTML();
+	$text = str_replace(array("<html><body>", "</body></html>", $doctype), array("", "", ""), $text);
+
+	return($text);
+}