rework class system to use subdirectories

add placeholder plugin/hook system

classes/button/tweet.php

@@ -0,0 +1,31 @@
+<?php
+class Button_Tweet extends Button {
+	function render($article_id) {
+		$rv = "<img src=\"".theme_image($this->link, 'images/art-tweet.png')."\"
+			class='tagsPic' style=\"cursor : pointer\"
+			onclick=\"tweetArticle($article_id)\"
+			title='".__('Share on Twitter')."'>";
+
+		return $rv;
+	}
+
+	function getTweetInfo() {
+		$id = db_escape_string($_REQUEST['id']);
+
+		$result = db_query($this->link, "SELECT title, link
+				FROM ttrss_entries, ttrss_user_entries
+				WHERE id = '$id' AND ref_id = id AND owner_uid = " .$_SESSION['uid']);
+
+		if (db_num_rows($result) != 0) {
+			$title = truncate_string(strip_tags(db_fetch_result($result, 0, 'title')),
+				100, '...');
+			$article_link = db_fetch_result($result, 0, 'link');
+		}
+
+		print json_encode(array("title" => $title, "link" => $article_link,
+				"id" => $id));
+	}
+
+
+}
+?>