first import

sites/all/modules/file_entity/file_entity.field.inc

@@ -0,0 +1,117 @@
+<?php
+
+/**
+ * @file
+ * Field API integration for the file_entity module.
+ */
+
+/**
+ * Implements hook_field_formatter_info().
+ */
+function file_entity_field_formatter_info() {
+  $info['file_rendered'] = array(
+    'label' => t('Rendered file'),
+    'description' => t('Display the file in a specific view mode'),
+    'field types' => array('file', 'image'),
+    'settings' => array('file_view_mode' => 'default'),
+  );
+  return $info;
+}
+
+/**
+ * Implements hook_field_formatter_settings_form().
+ */
+function file_entity_field_formatter_settings_form($field, $instance, $view_mode, $form, &$form_state) {
+  $display = $instance['display'][$view_mode];
+  $settings = $display['settings'];
+  $element = array();
+
+  if ($display['type'] == 'file_rendered') {
+    $element['file_view_mode'] = array(
+      '#title'   => t('View mode'),
+      '#type'    => 'select',
+      '#options' => file_entity_view_mode_labels(),
+      '#default_value' => $settings['file_view_mode'],
+      // Never empty, so no #empty_option
+    );
+  }
+
+  return $element;
+}
+
+/**
+ * Implements hook_field_formatter_settings_summary().
+ */
+function file_entity_field_formatter_settings_summary($field, $instance, $view_mode) {
+  $display = $instance['display'][$view_mode];
+  $settings = $display['settings'];
+  $summary = NULL;
+
+  if ($display['type'] === 'file_rendered') {
+    $view_mode_label = file_entity_view_mode_label($settings['file_view_mode'], t('Unknown'));
+    $summary = t('View mode: %mode', array('%mode' => $view_mode_label));
+  }
+
+  return $summary;
+}
+
+/**
+ * Implements hook_field_formatter_view().
+ */
+function file_entity_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {
+  $settings = $display['settings'];
+  $element = array();
+
+  if ($display['type'] == 'file_rendered') {
+    $view_mode = $settings['file_view_mode'];
+
+    // To prevent infinite recursion caused by reference cycles, we store
+    // diplayed nodes in a recursion queue.
+    $recursion_queue = &drupal_static(__FUNCTION__, array());
+
+    // If no 'referencing entity' is set, we are starting a new 'reference
+    // thread' and need to reset the queue.
+    // @todo Bug: $entity->referencing_entity on files referenced in a different
+    // thread on the page. E.g: 1 references 1+2 / 2 references 1+2 / visit homepage.
+    // We'd need a more accurate way...
+    if (!isset($entity->referencing_entity)) {
+      $recursion_queue = array();
+    }
+
+    // The recursion queue only needs to track files.
+    if ($entity_type == 'file') {
+      list($id) = entity_extract_ids($entity_type, $entity);
+      $recursion_queue[$id] = $id;
+    }
+
+    // Prevent 'empty' fields from causing a WSOD.
+    $items = array_filter($items);
+
+    // Check the recursion queue to determine which nodes should be fully
+    // displayed, and which nodes will only be displayed as a title.
+    $files_display = array();
+    foreach ($items as $delta => $item) {
+      if (!isset($recursion_queue[$item['fid']])) {
+        $files_display[$item['fid']] = file_load($item['fid']);
+      }
+    }
+
+    // Load and build the fully displayed nodes.
+    if ($files_display) {
+      foreach ($files_display as $fid => $file) {
+        $files_display[$fid]->referencing_entity = $entity;
+        $files_display[$fid]->referencing_field = $field['field_name'];
+      }
+      $files_built = file_view_multiple($files_display, $view_mode);
+    }
+
+    // Assemble the render array.
+    foreach ($items as $delta => $item) {
+      if (isset($files_built[$item['fid']])) {
+        $element[$delta] = $files_built[$item['fid']];
+      }
+    }
+  }
+
+  return $element;
+}