first import

sites/all/modules/block_class/block_class.features.inc

@@ -0,0 +1,74 @@
+<?php
+
+/**
+ * Implements hook_features_export_options().
+ */
+function block_class_features_export_options() {
+  $query = db_select('block_class', 'bc');
+  $query->addExpression("CONCAT(bc.module, ':', bc.delta)");
+  $blocks = $query->execute()->fetchAllKeyed(0, 0);
+
+  natcasesort($blocks);
+  return $blocks;
+}
+
+/**
+ * Implements hook_features_export().
+ */
+function block_class_features_export($data, &$export, $module_name = '') {
+  $pipe = array();
+
+  $export['dependencies']['features'] = 'features';
+  $export['dependencies']['block_class'] = 'block_class';
+
+  foreach ($data as $component) {
+    $export['features']['block_class'][$component] = $component;
+  }
+
+  return $pipe;
+}
+
+/**
+ * Implements hook_features_export_render().
+ */
+function block_class_features_export_render($module, $data) {
+  $query = db_select('block_class', 'bc');
+  $query->addExpression("CONCAT(bc.module, ':', bc.delta)", 'id');
+  $query->addField('bc', 'css_class');
+  $classes = $query->execute()->fetchAllKeyed(1, 0);
+
+  $code = array();
+  foreach ($data as $id) {
+    if (isset($classes[$id])) {
+      list($module, $delta) = explode(':', $id);
+      $css_classes = $classes[$id];
+      $code[$id] = compact('module', 'delta', 'css_classes');
+    }
+  }
+
+  $code = "  return ". features_var_export($code, '  ') .";";
+
+  return array('block_class_features_default_class' => $code);
+}
+
+/**
+ * Implements hook_features_revert().
+ */
+function block_class_features_revert($module) {
+  block_class_features_rebuild($module);
+}
+
+/**
+ * Implements hook_features_rebuild().
+ */
+function block_class_features_rebuild($module) {
+  $blocks = module_invoke($module, 'block_class_features_default_class');
+  if ($blocks) {
+    foreach($blocks as $block) {
+      db_delete('block_class')->condition('module', $block['module'])->condition('delta', $block['delta'])->execute();
+      if (!empty($block['css_classes'])) {
+        $id = db_insert('block_class')->fields(array('module' => $block['module'], 'delta' => $block['delta'], 'css_class' => $block['css_classes']))->execute();
+      }
+    }
+  }
+}