#516138 by yched, KarenS, quicksketch, bangpound, et al.: CC-FREAKING-K IN CORE! OH YEAH! :D

1 files changed, 1398 insertions, 0 deletions

diff --git a/modules/field_ui/field_ui.admin.inc b/modules/field_ui/field_ui.admin.inc
new file mode 100644
index 000000000..caaa2d062
--- /dev/null
+++ b/modules/field_ui/field_ui.admin.inc
@@ -0,0 +1,1398 @@
+<?php
+// $Id$
+
+/**
+ * @file
+ * Administrative interface for custom field type creation.
+ */
+
+/**
+ * Menu callback; lists all defined fields for quick reference.
+ */
+function field_ui_fields_list() {
+  $instances = field_info_instances();
+  $field_types = field_info_field_types();
+  $bundles = field_info_bundles();
+  $header = array(t('Field name'), t('Field type'), t('Used in'));
+  $rows = array();
+  foreach ($instances as $bundle => $info) {
+    foreach ($info as $field_name => $instance) {
+      $field = field_info_field($field_name);
+      $admin_path = _field_ui_bundle_admin_path($bundle);
+      $rows[$field_name]['data'][0] = $field['locked'] ? t('@field_name (Locked)', array('@field_name' => $field_name)) : $field_name;
+      $rows[$field_name]['data'][1] = t($field_types[$field['type']]['label']);
+      $rows[$field_name]['data'][2][] = l($bundles[$bundle]['label'], $admin_path . '/fields');
+      $rows[$field_name]['class'] = $field['locked'] ? 'menu-disabled' : '';
+    }
+  }
+  foreach ($rows as $field_name => $cell) {
+    $rows[$field_name]['data'][2] = implode(', ', $cell['data'][2]);
+  }
+  if (empty($rows)) {
+    $output = t('No fields have been defined for any content type yet.');
+  }
+  else {
+    // Sort rows by field name.
+    ksort($rows);
+    $output = theme('table', $header, $rows);
+  }
+  return $output;
+}
+
+/**
+ * Helper function to display a message about inactive fields.
+ */
+function field_ui_inactive_message($bundle) {
+  $inactive_instances = field_ui_inactive_instances($bundle);
+  if (!empty($inactive_instances)) {
+    $field_types = field_info_field_types();
+    $widget_types = field_info_widget_types();
+
+    foreach ($inactive_instances as $field_name => $instance) {
+      $list[] = t('%field (@field_name) field requires the %widget_type widget provided by %widget_module module', array(
+      '%field' => $instance['label'],
+      '@field_name' => $instance['field_name'],
+      '%widget_type' => array_key_exists($instance['widget']['type'], $widget_types) ? $widget_types[$instance['widget']['type']]['label'] : $instance['widget']['type'],
+      '%widget_module' => $instance['widget']['module'],
+      ));
+    }
+    drupal_set_message(t('Inactive fields are not shown unless their providing modules are enabled. The following fields are not enabled: !list', array('!list' => theme('item_list', $list))), 'error');
+  }
+}
+
+/**
+ * Menu callback; listing of fields for a content type.
+ *
+ * Allows fields and pseudo-fields to be re-ordered.
+ */
+function field_ui_field_overview_form(&$form_state, $obj_type, $bundle) {
+  $bundle = field_attach_extract_bundle($obj_type, $bundle);
+
+  field_ui_inactive_message($bundle);
+  $admin_path = _field_ui_bundle_admin_path($bundle);
+
+  // When displaying the form, make sure the list of fields is up-to-date.
+  if (empty($form_state['post'])) {
+    field_cache_clear();
+  }
+
+  // Gather bundle information.
+  $instances = field_info_instances($bundle);
+  $field_types = field_info_field_types();
+  $widget_types = field_info_widget_types();
+
+  $extra = field_extra_fields($bundle);
+
+  // Store each default weight so that we can add the 'add new' rows after them.
+  $weights = array();
+
+  $form = array(
+    '#tree' => TRUE,
+    '#bundle' => $bundle,
+    '#fields' => array_keys($instances),
+    '#extra' => array_keys($extra),
+    '#field_rows' => array(),
+  );
+
+  // Fields.
+  foreach ($instances as $name => $instance) {
+    $field = field_info_field($instance['field_name']);
+    $admin_field_path = $admin_path . '/fields/' . $instance['field_name'];
+    $weight = $instance['widget']['weight'];
+    $form[$name] = array(
+      'label' => array(
+        '#markup' => check_plain($instance['label']),
+      ),
+      'field_name' => array(
+        '#markup' => $instance['field_name'],
+      ),
+      'type' => array(
+        '#markup' => l(t($field_types[$field['type']]['label']), $admin_field_path . '/field-settings', array('attributes' => array('title' => t('Edit field settings.')))),
+      ),
+      'widget_type' => array(
+        '#markup' => l(t($widget_types[$instance['widget']['type']]['label']), $admin_field_path . '/widget-type', array('attributes' => array('title' => t('Change widget type.')))),
+      ),
+      'edit' => array(
+        '#markup' => l(t('edit'), $admin_field_path, array('attributes' => array('title' => t('Edit instance settings.')))),
+      ),
+      'delete' => array(
+        '#markup' => l(t('delete'), $admin_field_path . '/delete', array('attributes' => array('title' => t('Delete instance.')))),
+       ),
+      'weight' => array(
+        '#type' => 'textfield',
+        '#default_value' => $weight,
+        '#size' => 3,
+       ),
+      'hidden_name' => array(
+        '#type' => 'hidden',
+        '#default_value' => $instance['field_name'],
+       ),
+      '#row_type' => 'field',
+    );
+
+    if (!empty($instance['locked'])) {
+      $form[$name]['edit'] = array('#value' => t('Locked'));
+      $form[$name]['delete'] = array();
+      $form[$name]['#disabled_row'] = TRUE;
+    }
+    $form['#field_rows'][] = $name;
+    $weights[] = $weight;
+  }
+
+  // Non-field elements.
+  foreach ($extra as $name => $label) {
+    $weight = $extra[$name]['weight'];
+    $form[$name] = array(
+      'label' => array(
+        '#markup' => t($extra[$name]['label']),
+      ),
+      'name' => array(
+        '#markup' => $name,
+      ),
+      'description' => array(
+        '#markup' => isset($extra[$name]['description']) ? $extra[$name]['description'] : '',
+      ),
+      'weight' => array(
+        '#type' => 'textfield',
+        '#default_value' => $weight,
+        '#size' => 3,
+      ),
+      'edit' => array(
+        '#markup' => isset($extra[$name]['edit']) ? $extra[$name]['edit'] : '',
+      ),
+      'delete' => array(
+        '#markup' => isset($extra[$name]['delete']) ? $extra[$name]['delete'] : '',
+      ),
+      'hidden_name' => array(
+        '#type' => 'hidden',
+        '#default_value' => $name,
+      ),
+      '#disabled_row' => TRUE,
+      '#row_type' => 'extra',
+    );
+    $form['#field_rows'][] = $name;
+    $weights[] = $weight;
+  }
+
+  // Additional row: add new field.
+  $weight = !empty($weights) ? max($weights) + 1 : 0;
+  $field_type_options = field_ui_field_type_options();
+  $widget_type_options = field_ui_widget_type_options(NULL, TRUE);
+  if ($field_type_options && $widget_type_options) {
+    array_unshift($field_type_options, t('- Select a field type -'));
+    array_unshift($widget_type_options, t('- Select a widget -'));
+    $name = '_add_new_field';
+    $form[$name] = array(
+      'label' => array(
+        '#type' => 'textfield',
+        '#size' => 15,
+        '#description' => t('Label'),
+      ),
+      'field_name' => array(
+        '#type' => 'textfield',
+        // This field should stay LTR even for RTL languages.
+        '#field_prefix' => '<span dir="ltr">field_',
+        '#field_suffix' => '</span>&lrm;',
+        '#attributes' => array('dir'=>'ltr'),
+        '#size' => 15,
+        '#description' => t('Field name (a-z, 0-9, _)'),
+      ),
+      'type' => array(
+        '#type' => 'select',
+        '#options' => $field_type_options,
+        '#description' => t('Type of data to store.'),
+      ),
+      'widget_type' => array(
+        '#type' => 'select',
+        '#options' => $widget_type_options,
+        '#description' => t('Form element to edit the data.'),
+      ),
+      'weight' => array(
+        '#type' => 'textfield',
+        '#default_value' => $weight,
+        '#size' => 3,
+      ),
+      'hidden_name' => array(
+        '#type' => 'hidden',
+        '#default_value' => $name,
+      ),
+      '#add_new' => TRUE,
+      '#row_type' => 'add_new_field',
+    );
+    $form['#field_rows'][] = $name;
+  }
+
+  // Additional row: add existing field.
+  $existing_field_options = field_ui_existing_field_options($bundle);
+  if ($existing_field_options && $widget_type_options) {
+    $weight++;
+    array_unshift($existing_field_options, t('- Select an existing field -'));
+    $name = '_add_existing_field';
+    $form[$name] = array(
+      'label' => array(
+        '#type' => 'textfield',
+        '#size' => 15,
+        '#description' => t('Label'),
+      ),
+      'field_name' => array(
+        '#type' => 'select',
+        '#options' => $existing_field_options,
+        '#description' => t('Field to share'),
+      ),
+      'widget_type' => array(
+        '#type' => 'select',
+        '#options' => $widget_type_options,
+        '#description' => t('Form element to edit the data.'),
+      ),
+      'weight' => array(
+        '#type' => 'textfield',
+        '#default_value' => $weight,
+        '#size' => 3,
+      ),
+      'hidden_name' => array(
+        '#type' => 'hidden',
+        '#default_value' => $name,
+      ),
+      '#add_new' => TRUE,
+      '#row_type' => 'add_existing_field',
+    );
+    $form['#field_rows'][] = $name;
+  }
+
+  $form['submit'] = array('#type' => 'submit', '#value' => t('Save'));
+  return $form;
+}
+
+/**
+ * Theme preprocess function for field_ui-field-overview-form.tpl.php.
+ */
+function template_preprocess_field_ui_field_overview_form(&$vars) {
+  $form = &$vars['form'];
+
+  drupal_add_css(drupal_get_path('module', 'field_ui') . '/field_ui.css');
+  drupal_add_tabledrag('field-overview', 'order', 'sibling', 'field-weight');
+  drupal_add_js(drupal_get_path('module', 'field_ui') . '/field_ui.js');
+  // Add settings for the update selects behavior.
+  $js_fields = array();
+  foreach (field_ui_existing_field_options($form['#bundle']) as $field_name => $fields) {
+    $field = field_info_field($field_name);
+    $instance = field_info_instance($field_name, $form['#bundle']);
+    $js_fields[$field_name] = array('label' => $instance['label'], 'type' => $field['type'], 'widget' => $instance['widget']['type']);
+  }
+  drupal_add_js(array('fieldWidgetTypes' => field_ui_widget_type_options(), 'fields' => $js_fields), 'setting');
+
+  $order = _field_ui_overview_order($form, $form['#field_rows']);
+  $rows = array();
+
+  // Identify the 'new item' keys in the form.
+  $keys = array_keys($form);
+  $add_rows = array();
+  foreach ($keys as $key) {
+    if (substr($key, 0, 4) == '_add') {
+      $add_rows[] = $key;
+    }
+  }
+  while ($order) {
+    $key = reset($order);
+    $element = &$form[$key];
+    $row = new stdClass();
+
+    // Add target classes for the tabledrag behavior.
+    $element['weight']['#attributes']['class'] = 'field-weight';
+    $element['hidden_name']['#attributes']['class'] = 'field-name';
+    // Add target classes for the update selects behavior.
+    switch ($element['#row_type']) {
+      case 'add_new_field':
+        $element['type']['#attributes']['class'] = 'field-type-select';
+        $element['widget_type']['#attributes']['class'] = 'widget-type-select';
+        break;
+
+      case 'add_existing_field':
+        $element['field_name']['#attributes']['class'] = 'field-select';
+        $element['widget_type']['#attributes']['class'] = 'widget-type-select';
+        $element['label']['#attributes']['class'] = 'label-textfield';
+        break;
+    }
+    foreach (element_children($element) as $child) {
+      $row->{$child} = drupal_render($element[$child]);
+    }
+    $row->label_class = 'label-' . strtr($element['#row_type'], '_', '-');
+    $row->row_type = $element['#row_type'];
+    $row->class = 'draggable';
+    $row->class .= isset($element['#add_new']) ? ' add-new' : '';
+    $row->class .= isset($element['#disabled_row']) ? ' menu-disabled' : '';
+
+    $rows[] = $row;
+    array_shift($order);
+  }
+  $vars['rows'] = $rows;
+  $vars['submit'] = drupal_render_children($form);
+}
+
+/**
+ * Validate handler for the field overview form.
+ */
+function field_ui_field_overview_form_validate($form, &$form_state) {
+  _field_ui_field_overview_form_validate_add_new($form, $form_state);
+  _field_ui_field_overview_form_validate_add_existing($form, $form_state);
+}
+
+/**
+ * Helper function for field_ui_field_overview_form_validate.
+ *
+ * Validate the 'add new field' row.
+ */
+function _field_ui_field_overview_form_validate_add_new($form, &$form_state) {
+  $field = $form_state['values']['_add_new_field'];
+
+  // Validate if any information was provided in the 'add new field' row.
+  if (array_filter(array($field['label'], $field['field_name'], $field['type'], $field['widget_type']))) {
+    // Missing label.
+    if (!$field['label']) {
+      form_set_error('_add_new_field][label', t('Add new field: you need to provide a label.'));
+    }
+
+    // Missing field name.
+    if (!$field['field_name']) {
+      form_set_error('_add_new_field][field_name', t('Add new field: you need to provide a field name.'));
+    }
+    // Field name validation.
+    else {
+      $field_name = $field['field_name'];
+
+      // Add the 'field_' prefix.
+      if (substr($field_name, 0, 6) != 'field_') {
+        $field_name = 'field_' . $field_name;
+        form_set_value($form['_add_new_field']['field_name'], $field_name, $form_state);
+      }
+
+      // Invalid field name.
+      if (!preg_match('!^field_[a-z0-9_]+$!', $field_name)) {
+        form_set_error('_add_new_field][field_name', t('Add new field: the field name %field_name is invalid. The name must include only lowercase unaccentuated letters, numbers, and underscores.', array('%field_name' => $field_name)));
+      }
+      if (strlen($field_name) > 32) {
+        form_set_error('_add_new_field][field_name', t("Add new field: the field name %field_name is too long. The name is limited to 32 characters, including the 'field_' prefix.", array('%field_name' => $field_name)));
+      }
+
+      // Field name already exists. We need to check inactive fields as well, so
+      // we can't use field_info_fields().
+      $fields = field_read_fields(array('field_name' => $field_name), array('include_inactive' => TRUE));
+      if ($fields) {
+        form_set_error('_add_new_field][field_name', t('Add new field: the field name %field_name already exists.', array('%field_name' => $field_name)));
+      }
+    }
+
+    // Missing field type.
+    if (!$field['type']) {
+      form_set_error('_add_new_field][type', t('Add new field: you need to select a field type.'));
+    }
+
+    // Missing widget type.
+    if (!$field['widget_type']) {
+      form_set_error('_add_new_field][widget_type', t('Add new field: you need to select a widget.'));
+    }
+    // Wrong widget type.
+    elseif ($field['type']) {
+      $widget_types = field_ui_widget_type_options($field['type']);
+      if (!isset($widget_types[$field['widget_type']])) {
+        form_set_error('_add_new_field][widget_type', t('Add new field: invalid widget.'));
+      }
+    }
+  }
+}
+
+/**
+ * Helper function for field_ui_field_overview_form_validate.
+ *
+ * Validate the 'add existing field' row.
+ */
+function _field_ui_field_overview_form_validate_add_existing($form, &$form_state) {
+  // The form element might be absent if no existing fields can be added to
+  // this content type
+  if (isset($form_state['values']['_add_existing_field'])) {
+    $field = $form_state['values']['_add_existing_field'];
+
+    // Validate if any information was provided in the 'add existing field' row.
+    if (array_filter(array($field['label'], $field['field_name'], $field['widget_type']))) {
+      // Missing label.
+      if (!$field['label']) {
+        form_set_error('_add_existing_field][label', t('Add existing field: you need to provide a label.'));
+      }
+
+      // Missing existing field name.
+      if (!$field['field_name']) {
+        form_set_error('_add_existing_field][field_name', t('Add existing field: you need to select a field.'));
+      }
+
+      // Missing widget type.
+      if (!$field['widget_type']) {
+        form_set_error('_add_existing_field][widget_type', t('Add existing field: you need to select a widget.'));
+      }
+      // Wrong widget type.
+      elseif ($field['field_name'] && ($existing_field = field_info_field($field['field_name']))) {
+        $widget_types = field_ui_widget_type_options($existing_field['type']);
+        if (!isset($widget_types[$field['widget_type']])) {
+          form_set_error('_add_existing_field][widget_type', t('Add existing field: invalid widget.'));
+        }
+      }
+    }
+  }
+}
+
+/**
+ * Submit handler for the field overview form.
+ */
+function field_ui_field_overview_form_submit($form, &$form_state) {
+  $form_values = $form_state['values'];
+  $bundle = $form['#bundle'];
+  $admin_path = _field_ui_bundle_admin_path($bundle);
+
+  // Update field weights.
+  $extra = array();
+  foreach ($form_values as $key => $values) {
+    if (in_array($key, $form['#fields'])) {
+      $instance = field_read_instance($key, $bundle);
+      $instance['widget']['weight'] = $values['weight'];
+      foreach($instance['display'] as $build_mode => $display) {
+        $instance['display'][$build_mode]['weight'] = $values['weight'];
+      }
+      field_update_instance($instance);
+    }
+    elseif (in_array($key, $form['#extra'])) {
+      $extra[$key] = $values['weight'];
+    }
+  }
+
+  if ($extra) {
+    variable_set("field_extra_weights_$bundle", $extra);
+  }
+  else {
+    variable_del("field_extra_weights_$bundle");
+  }
+
+  $destinations = array();
+
+  // Create new field.
+  $field = array();
+  if (!empty($form_values['_add_new_field']['field_name'])) {
+    $values = $form_values['_add_new_field'];
+
+    $field = array(
+      'field_name' => $values['field_name'],
+      'type' => $values['type'],
+    );
+    $instance = array(
+      'field_name' => $field['field_name'],
+      'bundle' => $bundle,
+      'label' => $values['label'],
+      'widget' => array(
+        'type' => $values['widget_type'],
+        'weight' => $values['weight'],
+      ),
+    );
+
+    // Create the field and instance.
+    try {
+      field_create_field($field);
+      field_create_instance($instance);
+
+      $destinations[] = $admin_path . '/fields/refresh';
+      $destinations[] = $admin_path . '/fields/' . $field['field_name'] . '/field-settings';
+      $destinations[] = $admin_path . '/fields/' . $field['field_name'] . '/edit';
+
+      // Store new field information for any additional submit handlers.
+      $form_state['fields_added']['_add_new_field'] = $field['field_name'];
+    }
+    catch (Exception $e) {
+      drupal_set_message(t('There was a problem creating field %label: @message.', array('%label' => $instance['label'], '@message' => $e->getMessage())));
+    }
+  }
+
+  // Add existing field.
+  if (!empty($form_values['_add_existing_field']['field_name'])) {
+    $values = $form_values['_add_existing_field'];
+    $field = field_info_field($values['field_name']);
+    if (!empty($field['locked'])) {
+      drupal_set_message(t('The field %label cannot be added because it is locked.', array('%label' => $values['label'])));
+    }
+    else {
+      $instance = array(
+        'field_name' => $field['field_name'],
+        'bundle' => $bundle,
+        'label' => $values['label'],
+        'widget' => array(
+          'type' => $values['widget_type'],
+          'weight' => $values['weight'],
+        ),
+      );
+
+      try {
+        field_create_instance($instance);
+        $destinations[] = $admin_path . '/fields/refresh';
+        $destinations[] = $admin_path . '/fields/' . $instance['field_name'] . '/edit';
+        // Store new field information for any additional submit handlers.
+        $form_state['fields_added']['_add_existing_field'] = $instance['field_name'];
+      }
+      catch (Exception $e) {
+        drupal_set_message(t('There was a problem creating field instance %label: @message.', array('%label' => $instance['label'], '@message' => $e->getMessage())));
+      }
+    }
+  }
+
+  if ($destinations) {
+    $destinations[] = urldecode(substr(drupal_get_destination(), 12));
+    unset($_REQUEST['destination']);
+    $form_state['redirect'] = field_ui_get_destinations($destinations);
+  }
+
+  field_cache_clear();
+}
+
+/**
+ * Menu callback; presents a listing of fields display settings for a content type.
+ *
+ * This form includes form widgets to select which fields appear in teaser and
+ * full build modes, and how the field labels should be rendered.
+ */
+function field_ui_display_overview_form(&$form_state, $obj_type, $bundle, $build_modes_selector = 'basic') {
+  $bundle = field_attach_extract_bundle($obj_type, $bundle);
+
+  field_ui_inactive_message($bundle);
+  $admin_path = _field_ui_bundle_admin_path($bundle);
+
+  // Gather type information.
+  $entity = field_info_bundle_entity($bundle);
+  $instances = field_info_instances($bundle);
+  $field_types = field_info_field_types();
+  $build_modes = field_ui_build_modes_tabs($entity, $build_modes_selector);
+
+  $form = array(
+    '#tree' => TRUE,
+    '#bundle' => $bundle,
+    '#fields' => array_keys($instances),
+    '#contexts' => $build_modes_selector,
+  );
+
+  if (empty($instances)) {
+    drupal_set_message(t('There are no fields yet added. You can add new fields on the <a href="@link">Manage fields</a> page.', array('@link' => url($admin_path . '/fields'))), 'warning');
+    return $form;
+  }
+
+  // Fields.
+  $label_options = array(
+    'above' => t('Above'),
+    'inline' => t('Inline'),
+    'hidden' => t('<Hidden>'),
+  );
+  foreach ($instances as $name => $instance) {
+    $field = field_info_field($instance['field_name']);
+    $weight = $instance['widget']['weight'];
+
+    $form[$name] = array(
+      'human_name' => array('#markup' => check_plain($instance['label'])),
+      'weight' => array('#type' => 'value', '#value' => $weight),
+    );
+    $defaults = $instance['display'];
+
+    $formatter_options = field_ui_formatter_options($field['type']);
+    $formatter_options['hidden'] = t('<Hidden>');
+    foreach ($build_modes as $build_mode => $label) {
+      $display = isset($instance['display'][$build_mode]) ? $instance['display'][$build_mode] : $instance['display']['full'];
+      $form[$name][$build_mode]['label'] = array(
+        '#type' => 'select',
+        '#options' => $label_options,
+        '#default_value' => $display['label'],
+      );
+      $form[$name][$build_mode]['type'] = array(
+        '#type' => 'select',
+        '#options' => $formatter_options,
+        '#default_value' => $display['type'],
+      );
+    }
+  }
+
+  $form['submit'] = array('#type' => 'submit', '#value' => t('Save'));
+  return $form;
+}
+
+
+/**
+ * Theme preprocess function for field_ui-display-overview-form.tpl.php.
+ */
+function template_preprocess_field_ui_display_overview_form(&$vars) {
+  $form = &$vars['form'];
+
+  $contexts_selector = $form['#contexts'];
+  $vars['contexts'] = field_ui_build_modes_tabs(field_info_bundle_entity($form['#bundle']), $contexts_selector);
+
+  $order = _field_ui_overview_order($form, $form['#fields']);
+  if (empty($order)) {
+    $vars['rows'] = array();
+    $vars['submit'] = '';
+    return;
+  }
+  $rows = array();
+  foreach ($order as $key) {
+    $element = &$form[$key];
+    $row = new stdClass();
+    foreach (element_children($element) as $child) {
+      if (array_key_exists('label', $element[$child])) {
+        $row->{$child}->label = drupal_render($element[$child]['label']);
+        $row->{$child}->type = drupal_render($element[$child]['type']);
+      }
+      else {
+        $row->{$child} = drupal_render($element[$child]);
+      }
+    }
+    $row->label_class = 'label-field';
+    $rows[] = $row;
+  }
+
+  $vars['rows'] = $rows;
+  $vars['submit'] = drupal_render_children($form);
+}
+
+/**
+ * Submit handler for the display overview form.
+ */
+function field_ui_display_overview_form_submit($form, &$form_state) {
+  module_load_include('inc', 'field', 'includes/field.crud');
+  $form_values = $form_state['values'];
+  foreach ($form_values as $key => $values) {
+    if (in_array($key, $form['#fields'])) {
+      $instance = field_info_instance($key, $form['#bundle']);
+      unset($values['weight']);
+      $instance['display'] = array_merge($instance['display'], $values);
+      field_update_instance($instance);
+    }
+  }
+  drupal_set_message(t('Your settings have been saved.'));
+}
+
+/**
+ * Return an array of field_type options.
+ */
+function field_ui_field_type_options() {
+  $options = &drupal_static(__FUNCTION__);
+
+  if (!isset($options)) {
+    $options = array();
+    $field_types = field_info_field_types();
+    $field_type_options = array();
+    foreach ($field_types as $name => $field_type) {
+      // Skip field types which have no widget types.
+      if (field_ui_widget_type_options($name)) {
+        $options[$name] = $field_type['label'];
+      }
+    }
+    asort($options);
+  }
+  return $options;
+}
+
+/**
+ * Return an array of widget type options for a field type.
+ *
+ * If no field type is provided, returns a nested array of all widget types,
+ * keyed by field type human name.
+ */
+function field_ui_widget_type_options($field_type = NULL, $by_label = FALSE) {
+  $options = &drupal_static(__FUNCTION__);
+
+  if (!isset($options)) {
+    $options = array();
+    $field_types = field_info_field_types();
+    foreach (field_info_widget_types() as $name => $widget_type) {
+      foreach ($widget_type['field types'] as $widget_field_type) {
+        // Check that the field type exists.
+        if (isset($field_types[$widget_field_type])) {
+          $options[$widget_field_type][$name] = $widget_type['label'];
+        }
+      }
+    }
+  }
+
+  if (isset($field_type)) {
+    return !empty($options[$field_type]) ? $options[$field_type] : array();
+  }
+  if ($by_label) {
+    $field_types = field_info_field_types();
+    $options_by_label = array();
+    foreach ($options as $field_type => $widgets) {
+      $options_by_label[$field_types[$field_type]['label']] = $widgets;
+    }
+    return $options_by_label;
+  }
+  return $options;
+}
+
+/**
+ * Return an array of formatter options for a field type.
+ *
+ * If no field type is provided, returns a nested array of all formatters, keyed
+ * by field type.
+ */
+function field_ui_formatter_options($field_type = NULL) {
+  $options = &drupal_static(__FUNCTION__);
+
+  if (!isset($options)) {
+    $field_types = field_info_field_types();
+    $options = array();
+    foreach (field_info_formatter_types() as $name => $formatter) {
+      foreach ($formatter['field types'] as $formatter_field_type) {
+        // Check that the field type exists.
+        if (isset($field_types[$formatter_field_type])) {
+          $options[$formatter_field_type][$name] = $formatter['label'];
+        }
+      }
+    }
+  }
+
+  if ($field_type) {
+    return !empty($options[$field_type]) ? $options[$field_type] : array();
+  }
+  return $options;
+}
+
+/**
+ * Return an array of existing field to be added to a bundle.
+ */
+function field_ui_existing_field_options($bundle) {
+  $options = array();
+  $field_types = field_info_field_types();
+  foreach (field_info_instances() as $bundle_name => $instances) {
+    // No need to look in the current bundle.
+    if ($bundle_name != $bundle) {
+      foreach ($instances as $instance) {
+        $field = field_info_field($instance['field_name']);
+        // Don't show locked fields or fields already in the current bundle.
+        if (empty($field['locked']) && !field_info_instance($field['field_name'], $bundle)) {
+          $text = t('@type: @field (@label)', array(
+            '@type' => $field_types[$field['type']]['label'],
+            '@label' => t($instance['label']), '@field' => $instance['field_name'],
+          ));
+          $options[$instance['field_name']] = (drupal_strlen($text) > 80 ? truncate_utf8($text, 77) . '...' : $text);
+        }
+      }
+    }
+  }
+  // Sort the list by field name.
+  asort($options);
+  return $options;
+}
+
+/**
+ * Helper function to determine if a field has data in the database.
+ */
+function field_ui_field_has_data($field) {
+  $results = field_attach_query($field['id'], array(), 1);
+  return !empty($results);
+}
+
+/**
+ * Menu callback; presents the field settings edit page.
+ */
+function field_ui_field_settings_form(&$form_state, $obj_type, $bundle, $instance) {
+  $bundle = field_attach_extract_bundle($obj_type, $bundle);
+  $field = field_info_field($instance['field_name']);
+
+  // When a field is first created, we have to get data from the db.
+  if (!isset($instance['label'])) {
+    $instance = field_read_instance($field['field_name'], $bundle);
+    $field = field_read_field($field['field_name']);
+  }
+
+  $field_type = field_info_field_types($field['type']);
+
+  $info_function = $field['module'] . '_field_info';
+  $info = $info_function();
+  $description = '<p><strong>' . $info[$field['type']]['label'] . ':</strong> ';
+  $description .= $info[$field['type']]['description'] . '</p>';
+  $form['#prefix'] = '<div class="description">' . $description . '</div>';
+
+  $description = '<p>' . t('These settings apply to the %field field everywhere it is used. These settings impact the way that data is stored in the database and cannot be changed once data has been created.', array('%field' => $instance['label'])) . '</p>';
+
+  // Create a form structure for the field values.
+  $form['field'] = array(
+    '#type' => 'fieldset',
+    '#title' => t('%field field settings', array('%field' => $instance['label'])),
+    '#description' => $description,
+    '#tree' => TRUE,
+  );
+
+  // See if data already exists for this field.
+  // If so, prevent changes to the field settings.
+  $has_data = field_ui_field_has_data($field);
+  if ($has_data) {
+    $form['field']['#description'] = '<div class=error>' . t('There is data for this field in the database. The field settings can no longer be changed.' . '</div>') . $form['field']['#description'];
+  }
+
+  // Build the non-configurable field values.
+  $form['field']['field_name'] = array('#type' => 'value', '#value' => $field['field_name']);
+  $form['field']['type'] = array('#type' => 'value', '#value' => $field['type']);
+  $form['field']['module'] = array('#type' => 'value', '#value' => $field['module']);
+  $form['field']['active'] = array('#type' => 'value', '#value' => $field['active']);
+
+  // Add settings provided by the field module.
+  $form['field']['settings'] = array();
+  $additions = module_invoke($field_type['module'], 'field_settings_form', $field, $instance);
+  if (is_array($additions)) {
+    $form['field']['settings'] = $additions;
+    // @todo Filter this so only the settings that cannot be changed are shown
+    //   in this form. For now, treating all settings as changeable, which means
+    //   they show up here and in edit form.
+  }
+  if (empty($form['field']['settings'])) {
+    $form['field']['settings'] = array(
+      '#markup' => t('%field has no field settings.', array('%field' => $instance['label'])),
+    );
+  }
+  else {
+    foreach ($form['field']['settings'] as $key => $setting) {
+      if (substr($key, 0, 1) != '#') {
+        $form['field']['settings'][$key]['#disabled'] = $has_data;
+      }
+    }
+  }
+  $form['#bundle'] = $bundle;
+
+  $form['submit'] = array('#type' => 'submit', '#value' => t('Save field settings'));
+  return $form;
+}
+
+/**
+ * Save a field's settings after editing.
+ */
+function field_ui_field_settings_form_submit($form, &$form_state) {
+  $form_values = $form_state['values'];
+  $field_values = $form_values['field'];
+
+  // Merge incoming form values into the existing field.
+  $field = field_info_field($field_values['field_name']);
+
+  // Do not allow changes to fields with data.
+  if (field_ui_field_has_data($field)) {
+    return;
+  }
+
+  // Remove the 'bundles' element added by field_info_field.
+  // @todo This is ugly, there must be a better way.
+  unset($field['bundles']);
+  $bundle = $form['#bundle'];
+  $instance = field_info_instance($field['field_name'], $bundle);
+
+  // Update the field.
+  $field = array_merge($field, $field_values);
+  field_ui_update_field($field);
+
+  drupal_set_message(t('Updated field %label field settings.', array('%label' => $instance['label'])));
+  $form_state['redirect'] = field_ui_next_destination($bundle);
+}
+
+/**
+ * Menu callback; select a widget for the field.
+ */
+function field_ui_widget_type_form(&$form_state, $obj_type, $bundle, $instance) {
+  $bundle = field_attach_extract_bundle($obj_type, $bundle);
+  $field = field_read_field($instance['field_name']);
+
+  $field_type = field_info_field_types($field['type']);
+  $widget_type = field_info_widget_types($instance['widget']['type']);
+  $bundles = field_info_bundles();
+  $bundle_label = $bundles[$bundle]['label'];
+
+  $form['basic'] = array(
+    '#type' => 'fieldset',
+    '#title' => t('Change widget'),
+  );
+  $form['basic']['widget_type'] = array(
+    '#type' => 'select',
+    '#title' => t('Widget type'),
+    '#required' => TRUE,
+    '#options' => field_ui_widget_type_options($field['type']),
+    '#default_value' => $instance['widget']['type'],
+    '#description' => t('The type of form element you would like to present to the user when creating this field in the %type type.', array('%type' => $bundle_label)),
+  );
+
+  $form['#instance'] = $instance;
+  $form['submit'] = array('#type' => 'submit', '#value' => t('Continue'));
+
+  $form['#validate'] = array();
+  $form['#submit'] = array('field_ui_widget_type_form_submit');
+
+  return $form;
+}
+
+/**
+ * Submit the change in widget type.
+ */
+function field_ui_widget_type_form_submit($form, &$form_state) {
+  $form_values = $form_state['values'];
+  $instance = $form['#instance'];
+  $bundle = $instance['bundle'];
+
+  // Set the right module information.
+  $widget_type = field_info_widget_types($form_values['widget_type']);
+  $widget_module = $widget_type['module'];
+
+  $instance['widget']['type'] = $form_values['widget_type'];
+  $instance['widget']['module'] = $widget_module;
+  try {
+    field_update_instance($instance);
+    drupal_set_message(t('Changed the widget for field %label.', array('%label' => $instance['label'])));
+  }
+  catch (FieldException $e) {
+    drupal_set_message(t('There was a problem changing the widget for field %label.', array('%label' => $instance['label'])));
+  }
+
+  $form_state['redirect'] = field_ui_next_destination($bundle);
+}
+
+/**
+ * Menu callback; present a form for removing a field from a content type.
+ */
+function field_ui_field_delete_form(&$form_state, $obj_type, $bundle, $instance) {
+  $bundle = field_attach_extract_bundle($obj_type, $bundle);
+  $field = field_info_field($instance['field_name']);
+  $admin_path = _field_ui_bundle_admin_path($bundle);
+
+  $form['bundle'] = array('#type' => 'value', '#value' => $bundle);
+  $form['field_name'] = array('#type' => 'value', '#value' => $field['field_name']);
+
+  $output = confirm_form($form,
+    t('Are you sure you want to delete the field %field?', array('%field' => $instance['label'])),
+    $admin_path . '/fields',
+    t('If you have any content left in this field, it will be lost. This action cannot be undone.'),
+    t('Delete'), t('Cancel'),
+    'confirm'
+  );
+
+  if ($field['locked']) {
+    unset($output['actions']['submit']);
+    $output['description']['#markup'] = t('This field is <strong>locked</strong> and cannot be deleted.');
+  }
+
+  return $output;
+}
+
+/**
+ * Remove a field from a content type.
+ */
+function field_ui_field_delete_form_submit($form, &$form_state) {
+  $form_values = $form_state['values'];
+  $field = field_info_field($form_values['field_name']);
+  $instance = field_info_instance($form_values['field_name'], $form_values['bundle']);
+  $bundles = field_info_bundles();
+  $bundle = $form_values['bundle'];
+  $bundle_label = $bundles[$bundle]['label'];
+
+  if (!empty($bundle) && $field && !$field['locked'] && $form_values['confirm']) {
+    field_delete_instance($field['field_name'], $bundle);
+    // Delete the field if that was the last instance.
+    if (count($field['bundles'] == 1)) {
+      field_delete_field($field['field_name']);
+    }
+    drupal_set_message(t('The field %field has been deleted from the %type content type.', array('%field' => $instance['label'], '%type' => $bundle_label)));
+  }
+  else {
+    drupal_set_message(t('There was a problem removing the %field from the %type content type.', array('%field' => $instance['label'], '%type' => $bundle_label)));
+  }
+
+  $admin_path = _field_ui_bundle_admin_path($bundle);
+  $destinations = array(
+    $admin_path . '/fields/refresh',
+    $admin_path . '/fields',
+  );
+  $form_state['redirect'] = field_ui_get_destinations($destinations);
+}
+
+/**
+ * Menu callback; presents the field instance edit page.
+ */
+function field_ui_field_edit_form(&$form_state, $obj_type, $bundle, $instance) {
+  $bundle = field_attach_extract_bundle($obj_type, $bundle);
+
+  $field = field_info_field($instance['field_name']);
+  $form['#field'] = $field;
+
+  if (!empty($field['locked'])) {
+    $form['locked'] = array(
+      '#markup' => t('The field %field is locked and cannot be edited.', array('%field' => $instance['label'])),
+    );
+    return $form;
+  }
+
+  $field_type = field_info_field_types($field['type']);
+  $widget_type = field_info_widget_types($instance['widget']['type']);
+  $bundles = field_info_bundles();
+
+  $title = isset($instance['label']) ? $instance['label'] : $instance['field_name'];
+  drupal_set_title(check_plain($title));
+
+  // Create a form structure for the instance values.
+  $form['instance'] = array(
+    '#tree' => TRUE,
+    '#type' => 'fieldset',
+    '#title' => t('%type settings', array('%type' => $bundles[$bundle]['label'])),
+    '#description' => t('These settings apply only to the %field field when used in the %type type.', array('%field' => $instance['label'], '%type' => $bundles[$bundle]['label'])),
+    '#pre_render' => array('field_ui_field_edit_instance_pre_render'),
+  );
+
+  // Build the non-configurable instance values.
+  $form['instance']['field_name'] = array(
+    '#type' => 'value',
+    '#value' => $instance['field_name'],
+  );
+  $form['instance']['bundle'] = array(
+    '#type' => 'value',
+    '#value' => $bundle,
+  );
+  $form['instance']['widget']['weight'] = array(
+    '#type' => 'value',
+    '#value' => !empty($instance['widget']['weight']) ? $instance['widget']['weight'] : 0,
+  );
+
+  // Build the configurable instance values.
+  $form['instance']['label'] = array(
+    '#type' => 'textfield',
+    '#title' => t('Label'),
+    '#default_value' => !empty($instance['label']) ? $instance['label'] : $field['field_name'],
+    '#required' => TRUE,
+    '#description' => t('The human-readable label for this field.'),
+    '#weight' => -20,
+  );
+  $form['instance']['required'] = array(
+    '#type' => 'checkbox',
+    '#title' => t('Required'),
+    '#default_value' => !empty($instance['required']),
+    '#description' => t('Check if a value must be provided.'),
+    '#weight' => -10,
+  );
+
+  $form['instance']['description'] = array(
+    '#type' => 'textarea',
+    '#title' => t('Help text'),
+    '#default_value' => !empty($instance['description']) ? $instance['description'] : '',
+    '#rows' => 5,
+    '#description' => t('Instructions to present to the user below this field on the editing form.<br />Allowed HTML tags: @tags', array('@tags' => _field_filter_xss_display_allowed_tags())),
+    '#required' => FALSE,
+    '#weight' => 0,
+  );
+
+  // Build the widget component of the instance.
+  $form['instance']['widget']['type'] = array(
+    '#type' => 'value',
+    '#value' => $instance['widget']['type'],
+  );
+  $form['instance']['widget']['module'] = array(
+    '#type' => 'value',
+    '#value' => $widget_type['module'],
+  );
+  $form['instance']['widget']['active'] = array(
+    '#type' => 'value',
+    '#value' => !empty($field['instance']['widget']['active']) ? 1 : 0,
+  );
+
+  // Add additional field instance settings from the field module.
+  $additions = module_invoke($field['module'], 'field_instance_settings_form', $field, $instance);
+  if (is_array($additions)) {
+    $form['instance']['settings'] = $additions;
+  }
+
+  // Add additional widget settings from the widget module.
+  $additions = module_invoke($widget_type['module'], 'field_widget_settings_form', $field, $instance);
+  if (is_array($additions)) {
+    $form['instance']['widget']['settings'] = $additions;
+    $form['instance']['widget']['active']['#value'] = 1;
+  }
+
+  // Add handling for default value if not provided by any other module.
+  if (field_behaviors_widget('default value', $instance) == FIELD_BEHAVIOR_DEFAULT && empty($instance['default_value_function'])) {
+    // Store the original default value for use in programmed forms. The
+    // '#default_value' property is used instead of '#value' so programmed
+    // values can override whatever we set here.
+    $form['instance']['default_value'] = array(
+      '#type' => 'value',
+      '#default_value' => $instance['default_value'],
+    );
+
+    // We cannot tell at the time we build the form if this is a programmed form
+    // or not, so we always end up adding the default value widget even if we
+    // will not use it.
+    field_ui_default_value_widget($field, $instance, $form, $form_state);
+  }
+
+  $info = field_info_field_types($field['type']);
+  $description = '<p><strong>' . $info['label'] . ':</strong> ';
+  $description .= $info['description'] . '</p>';
+  $form['#prefix'] = '<div class="description">' . $description . '</div>';
+
+  $description = '<p>' . t('These settings apply to the %field field everywhere it is used.', array('%field' => $instance['label'])) . '</p>';
+
+  // Create a form structure for the field values.
+  $form['field'] = array(
+    '#type' => 'fieldset',
+    '#title' => t('%field field settings', array('%field' => $instance['label'])),
+    '#description' => $description,
+    '#tree' => TRUE,
+  );
+
+  // Build the configurable field values.
+  $description = t('Maximum number of values users can enter for this field.');
+  if (field_behaviors_widget('multiple values', $instance) == FIELD_BEHAVIOR_DEFAULT) {
+    $description .= '<br/>' . t("'Unlimited' will provide an 'Add more' button so the users can add as many values as they like.");
+  }
+  $form['field']['cardinality'] = array(
+    '#type' => 'select',
+    '#title' => t('Number of values'),
+    '#options' => array(FIELD_CARDINALITY_UNLIMITED => t('Unlimited')) + drupal_map_assoc(range(1, 10)),
+    '#default_value' => $field['cardinality'],
+    '#description' => $description,
+  );
+
+  // Add additional field settings from the field module.
+  $additions = module_invoke($field['module'], 'field_settings_form', $field, $instance);
+  if (is_array($additions)) {
+    // @todo Filter additional settings by whether they can be changed.
+    $form['field']['settings'] = $additions;
+  }
+
+  $form['submit'] = array('#type' => 'submit', '#value' => t('Save settings'));
+  return $form;
+}
+
+/**
+ * Pre-render function for field instance settings.
+ *
+ * Combines the instance, widget, and other settings into a single fieldset so
+ * that elements within each group can be shown at different weights as if they
+ * all had the same parent.
+ */
+function field_ui_field_edit_instance_pre_render($element) {
+  // Merge the widget settings into the main form.
+  if (isset($element['widget']['settings'])) {
+    foreach (element_children($element['widget']['settings']) as $key) {
+      $element['widget_' . $key] = $element['widget']['settings'][$key];
+    }
+    unset($element['widget']['settings']);
+  }
+
+  // Merge the instance settings into the main form.
+  if (isset($element['settings'])) {
+    foreach (element_children($element['settings']) as $key) {
+      $element['instance_' . $key] = $element['settings'][$key];
+    }
+    unset($element['settings']);
+  }
+
+  return $element;
+}
+
+/**
+ * Build default value fieldset.
+ */
+function field_ui_default_value_widget($field, $instance, &$form, &$form_state) {
+  $form['instance']['default_value_widget'] = array(
+    '#type' => 'fieldset',
+    '#title' => t('Default value'),
+    '#collapsible' => FALSE,
+    '#tree' => TRUE,
+    '#description' => t('The default value for this field, used when creating new content.'),
+  );
+
+  // Make sure the default value is not a required field.
+  $instance['required'] = FALSE;
+  $instance['description'] = '';
+  $items = $instance['default_value'];
+  // Set up form info that the default value widget will need.
+  $form['#fields'] = array(
+    $field['field_name'] => array(
+      'field' => $field,
+      'instance' => $instance,
+    ),
+  );
+  drupal_function_exists('field_default_form');
+  // @todo Allow multiple values (requires more work on 'add more' JS handler).
+  $widget_form = field_default_form(NULL, NULL, $field, $instance, $items, $form, $form_state, 0);
+  $form['instance']['default_value_widget'] += $widget_form;
+  $form['#fields'][$field['field_name']]['form_path'] = array(
+    'instance',
+    'default_value_widget',
+    $field['field_name'],
+  );
+}
+
+/**
+ * Validate a field's settings.
+ */
+function field_ui_field_edit_form_validate($form, &$form_state) {
+  $form_values = $form_state['values'];
+  $instance = $form_values['instance'];
+  $field = field_info_field($instance['field_name']);
+  $field_type = field_info_field_types($field['type']);
+  $widget_type = field_info_widget_types($instance['widget']['type']);
+
+  // Do no validation here. Assume field and widget modules are handling their
+  // own validation of form settings.
+
+  // If field.module is handling the default value, validate the result using
+  // the field validation.
+  if (field_behaviors_widget('default value', $instance) == FIELD_BEHAVIOR_DEFAULT) {
+    // If this is a programmed form, get rid of the default value widget, we
+    // have the default values already.
+    if (!empty($form_state['programmed'])) {
+      form_set_value(array('#parents' => array('instance', 'widget', 'default_value_widget')), NULL, $form_state);
+      return;
+    }
+
+    if (!empty($form_values['instance']['widget']['default_value_widget'])) {
+      // Fields that handle their own multiple values may use an expected value
+      // as the top-level key, so just pop off the top element.
+      $key = array_shift(array_keys($form_values['instance']['widget']['default_value_widget']));
+      $default_value = $form_values['instance']['widget']['default_value_widget'][$key];
+      $is_code = FALSE;
+      form_set_value(array('#parents' => array('instance', 'widget', 'default_value')), $default_value, $form_state);
+    }
+
+    if (isset($default_value)) {
+      $node = array();
+      $node[$field['field_name']] = $default_value;
+      $field['required'] = FALSE;
+      $field_function = $field_type['module'] . '_field';
+      $errors_before = form_get_errors();
+
+      // Widget now does its own validation, should be no need to add anything
+      // for widget validation here.
+      if (drupal_function_exists($field_function)) {
+        $field_function('validate', $node, $field, $default_value, $form, NULL);
+      }
+      // The field validation routine won't set an error on the right field, so
+      // set it here.
+      $errors_after = form_get_errors();
+      if (count($errors_after) > count($errors_before)) {
+        form_set_error('default_value', t('The default value is invalid.'));
+      }
+    }
+  }
+}
+
+/**
+ * Save instance settings after editing.
+ */
+function field_ui_field_edit_form_submit($form, &$form_state) {
+  $form_values = $form_state['values'];
+  $instance = $form_values['instance'];
+
+  // Update any field settings that have changed.
+  $field = field_info_field($instance['field_name']);
+  // Remove the 'bundles' element added by field_info_field.
+  // @todo This is ugly, there must be a better way.
+  unset($field['bundles']);
+  $field = array_merge($field, $form_state['values']['field']);
+  field_ui_update_field($field);
+
+  // Move the default value from the sample widget to the default value field.
+  if (isset($instance['default_value_widget'])) {
+    $instance['default_value'] = $instance['default_value_widget'][$instance['field_name']];
+    unset($instance['default_value_widget']);
+  }
+
+  // Update the instance settings.
+  module_load_include('inc', 'field', 'includes/field.crud');
+  field_update_instance($instance);
+
+  drupal_set_message(t('Saved %label configuration.', array('%label' => $instance['label'])));
+
+  $form_state['redirect'] = field_ui_next_destination($instance['bundle']);
+}
+
+/**
+ * Helper functions to handle multipage redirects.
+ */
+function field_ui_get_destinations($destinations) {
+  $query = array();
+  $path = array_shift($destinations);
+  if ($destinations) {
+    $query['destinations'] = $destinations;
+  }
+  return array($path, $query);
+}
+
+/**
+ * Return the next redirect path in a multipage sequence.
+ */
+function field_ui_next_destination($bundle) {
+  $destinations = !empty($_REQUEST['destinations']) ? $_REQUEST['destinations'] : array();
+  if (!empty($destinations)) {
+    unset($_REQUEST['destinations']);
+    return field_ui_get_destinations($destinations);
+  }
+  $admin_path = _field_ui_bundle_admin_path($bundle);
+  return $admin_path . '/fields';
+}
+
+/**
+ * Menu callback; rebuild the menu after adding new fields.
+ *
+ * Dummy function to force a page refresh so menu_rebuild() will work right
+ * when creating a new field that creates a new menu item.
+ */
+function field_ui_field_menu_refresh($obj_type, $bundle) {
+  $bundle = field_attach_extract_bundle($obj_type, $bundle);
+
+  menu_rebuild();
+  $destinations = field_ui_next_destination($bundle);
+  if (is_array($destinations)) {
+    $path = array_shift($destinations);
+    drupal_goto($path, $destinations);
+  }
+  drupal_goto($destinations);
+}
+
+/**
+ * Helper function to order fields when theming overview forms.
+ */
+function _field_ui_overview_order(&$form, $field_rows) {
+  // Put weight and parenting values into a $dummy render structure and let
+  // drupal_render() figure out the corresponding row order.
+  $dummy = array();
+  // Field rows: account for weight.
+  foreach ($field_rows as $name) {
+    $dummy[$name] = array(
+      '#markup' => $name . ' ',
+      '#type' => 'markup',
+      '#weight' => $form[$name]['weight']['#value'],
+    );
+  }
+  return $dummy ? explode(' ', trim(drupal_render($dummy))) : array();
+}
+
+/**
+ * Helper form element validator: integer.
+ */
+function _element_validate_integer($element, &$form_state) {
+  $value = $element['#value'];
+  if ($value !== '' && (!is_numeric($value) || intval($value) != $value)) {
+    form_error($element, t('%name must be an integer.', array('%name' => $element['#title'])));
+  }
+}
+
+/**
+ * Helper form element validator: integer > 0.
+ */
+function _element_validate_integer_positive($element, &$form_state) {
+  $value = $element['#value'];
+  if ($value !== '' && (!is_numeric($value) || intval($value) != $value || $value <= 0)) {
+    form_error($element, t('%name must be a positive integer.', array('%name' => $element['#title'])));
+  }
+}
+
+/**
+ * Helper form element validator: number.
+ */
+function _element_validate_number($element, &$form_state) {
+  $value = $element['#value'];
+  if ($value != '' && !is_numeric($value)) {
+    form_error($element, t('%name must be a number.', array('%name' => $element['#title'])));
+  }
+}