Move theme wrapper into separate file

lib/wrapper.php

@@ -0,0 +1,52 @@
+<?php
+/**
+ * Theme wrapper
+ *
+ * @link http://scribu.net/wordpress/theme-wrappers.html
+ */
+function roots_template_path() {
+  return Roots_Wrapping::$main_template;
+}
+
+function roots_sidebar_path() {
+  return Roots_Wrapping::sidebar();
+}
+
+class Roots_Wrapping {
+  // Stores the full path to the main template file
+  static $main_template;
+
+  // Stores the base name of the template file; e.g. 'page' for 'page.php' etc.
+  static $base;
+
+  static function wrap($template) {
+    self::$main_template = $template;
+
+    self::$base = substr(basename(self::$main_template), 0, -4);
+
+    if (self::$base === 'index') {
+      self::$base = false;
+    }
+
+    $templates = array('base.php');
+
+    if (self::$base) {
+      array_unshift($templates, sprintf('base-%s.php', self::$base));
+    }
+
+    $templates = apply_filters('roots_wrap_base', $templates);
+    return locate_template($templates);
+  }
+
+  static function sidebar() {
+    $templates = array('templates/sidebar.php');
+
+    if (self::$base) {
+      array_unshift($templates, sprintf('templates/sidebar-%s.php', self::$base));
+    }
+
+    $templates = apply_filters('roots_wrap_sidebar', $templates);
+    return locate_template($templates);
+  }
+}
+add_filter('template_include', array('Roots_Wrapping', 'wrap'), 99);