Here we go

info.php

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+<?php
+	$theme = Array();
+	
+	// Theme name
+	$theme['name'] = 'Ukko';
+	// Description (you can use Tinyboard markup here)
+	$theme['description'] = 'Board with threads and messages from all boards';
+	$theme['version'] = 'v0.1';
+	
+	// Theme configuration	
+	$theme['config'] = Array();
+	
+	$theme['config'][] = Array(
+		'title' => 'Board name',
+		'name' => 'title',
+		'type' => 'text',
+		'default' => 'Ukko'
+	);
+	$theme['config'][] = Array(
+		'title' => 'Board URI',
+		'name' => 'uri',
+		'type' => 'text',
+		'comment' => '(ukko for example)'
+	);	
+	$theme['config'][] = Array(
+		'title' => 'Subtitle',
+		'name' => 'subtitle',
+		'type' => 'text',
+		'comment' => '(%s = thread limit. for example "%s freshly bumped threads")'
+	);		
+	$theme['config'][] = Array(
+		'title' => 'Excluded boards',
+		'name' => 'exclude',
+		'type' => 'text',
+		'comment' => '(space seperated)'
+	);
+	$theme['config'][] = Array(
+		'title' => 'Number of threads',
+		'name' => 'thread_limit',
+		'type' => 'text',
+		'default' => '15',
+	);	
+	// Unique function name for building everything
+	$theme['build_function'] = 'ukko_build';
+	$theme['install_callback'] = 'ukko_install';
+
+	if(!function_exists('ukko_install')) {
+		function ukko_install($settings) {
+			if (!file_exists($settings['uri']))
+				@mkdir($settings['uri'], 0777) or error("Couldn't create " . $settings['uri'] . ". Check permissions.", true);
+		}
+	}
+	

theme.php

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+<?php
+	require 'info.php';
+	
+	function ukko_build($action, $settings) {
+		$ukko = new ukko();
+		$ukko->settings = $settings;
+		$ukko->build();
+	}
+	
+	class ukko {
+		public $settings;
+		public function build($mod = false) {
+			global $config;
+			$boards = listBoards();
+			
+			$body = '';
+			$overflow = array();
+			$board = array(
+				'url' => $this->settings['uri'],
+				'name' => $this->settings['title'],
+				'title' => sprintf($this->settings['subtitle'], $this->settings['thread_limit'])
+			);
+
+			$query = '';
+			foreach($boards as &$_board) {
+				if(in_array($_board['uri'], explode(' ', $this->settings['exclude'])))
+					continue;
+				$query .= sprintf("SELECT *, '%s' AS `board` FROM `posts_%s` WHERE `thread` IS NULL UNION ALL ", $_board['uri'], $_board['uri']);
+			}
+			$query = preg_replace('/UNION ALL $/', 'ORDER BY `bump` DESC', $query);
+			$query = query($query) or error(db_error());
+
+			$count = 0;
+			$threads = array();
+			while($post = $query->fetch()) {
+
+				if(!isset($threads[$post['board']])) {
+					$threads[$post['board']] = 1;
+				} else {
+					$threads[$post['board']] += 1;
+				}
+	
+				if($count < $this->settings['thread_limit']) {				
+					openBoard($post['board']);			
+					$thread = new Thread(
+						$post['id'], $post['subject'], $post['email'], $post['name'], $post['trip'], $post['capcode'], $post['body'], $post['time'],
+						$post['thumb'], $post['thumbwidth'], $post['thumbheight'], $post['file'], $post['filewidth'], $post['fileheight'], $post['filesize'],
+						$post['filename'], $post['ip'], $post['sticky'], $post['locked'], $post['sage'], $post['embed'], $mod ? '?/' : $config['root'], $mod
+					);
+
+					$posts = prepare(sprintf("SELECT * FROM `posts_%s` WHERE `thread` = :id ORDER BY `id` DESC LIMIT :limit", $post['board']));
+					$posts->bindValue(':id', $post['id']);
+					$posts->bindValue(':limit', ($post['sticky'] ? $config['threads_preview_sticky'] : $config['threads_preview']), PDO::PARAM_INT);
+					$posts->execute() or error(db_error($posts));
+					
+					$num_images = 0;
+					while ($po = $posts->fetch()) {
+						if ($po['file'])
+							$num_images++;
+						
+						$thread->add(new Post(
+							$po['id'], $post['id'], $po['subject'], $po['email'], $po['name'], $po['trip'], $po['capcode'], $po['body'], $po['time'],
+							$po['thumb'], $po['thumbwidth'], $po['thumbheight'], $po['file'], $po['filewidth'], $po['fileheight'], $po['filesize'],
+							$po['filename'], $po['ip'], $po['embed'], $mod ? '?/' : $config['root'], $mod)
+						);
+					
+					}
+					if ($posts->rowCount() == ($post['sticky'] ? $config['threads_preview_sticky'] : $config['threads_preview'])) {
+						$ct = prepare(sprintf("SELECT COUNT(`id`) as `num` FROM `posts_%s` WHERE `thread` = :thread UNION ALL SELECT COUNT(`id`) FROM `posts_%s` WHERE `file` IS NOT NULL AND `thread` = :thread", $post['board'], $post['board']));
+						$ct->bindValue(':thread', $post['id'], PDO::PARAM_INT);
+						$ct->execute() or error(db_error($count));
+						
+						$c = $ct->fetch();
+						$thread->omitted = $c['num'] - ($post['sticky'] ? $config['threads_preview_sticky'] : $config['threads_preview']);
+						
+						$c = $ct->fetch();
+						$thread->omitted_images = $c['num'] - $num_images;
+					}
+
+
+					$thread->posts = array_reverse($thread->posts);
+					$body .= '<h2><a href="' . $config['root'] . $post['board'] . '">/' . $post['board'] . '/</a></h2>';
+					$body .= $thread->build(true);
+				} else {
+					$page = 'index';
+					if(floor($threads[$post['board']] / $config['threads_per_page']) > 0) {
+						$page = floor($threads[$post['board']] / $config['threads_per_page']) + 1;
+					}
+					$overflow[] = array('id' => $post['id'], 'board' => $post['board'], 'page' => $page . '.html');
+				}
+
+				$count += 1;
+			}
+
+			$body .= '<script> var overflow = ' . json_encode($overflow) . '</script>';
+			$body .= '<script type="text/javascript" src="ukko.js"></script>';
+
+			file_write($this->settings['uri'] . '/index.html', Element('index.html', array(
+				'config' => $config,
+				'board' => $board,
+				'no_post_form' => true,
+				'body' => $body,
+				'boardlist' => createBoardlist($mod)
+			)));
+
+			file_write($this->settings['uri'] . '/ukko.js', Element('themes/ukko/ukko.js', array()));			
+		}
+		
+	};
+	
+?>

ukko.js

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+var cache = new Array(),
+	thread = false,
+	loading = false;
+$(document).ready(function() {
+	$(window).on('scroll', function() {
+		if($(window).scrollTop() + $(window).height() + 100 > $(document).height() && !loading && overflow.length > 0) {
+			var page = '../' + overflow[0].board + '/' + overflow[0].page;
+			if($.inArray(page, cache) != -1) {
+				thread = $('div#thread_' + overflow[0].id);
+				if(thread.length > 0) {
+					thread.prepend('<h2><a href="/' + overflow[0].board + '/">/' + overflow[0].board + '/</a></h2>');
+					$('div[id*="thread_"]').last().after(thread.attr('data-board', overflow[0].board).css('display', 'block'));
+					overflow.shift();
+				}
+			} else {
+				loading = true;
+				$.get(page, function(data) {
+					cache.push(page);
+
+					$(data).find('div[id*="thread_"]').each(function() {
+						$('body').prepend($(this).css('display', 'none').attr('data-board', overflow[0].board));
+					});
+
+					thread = $('div#thread_' + overflow[0].id + '[data-board="' + overflow[0].board + '"]');
+					if(thread.length > 0) {
+						thread.prepend('<h2><a href="/' + overflow[0].board + '/">/' + overflow[0].board + '/</a></h2>');
+						$('div[id*="thread_"]').last().after(thread.attr('data-board', overflow[0].board).css('display', 'block'));
+						overflow.shift();
+					}
+
+					loading = false;
+				});
+			}
+		}
+	});
+
+});