Drupal 7 Field API - Setup a new content type on install and add fields

At the moment we are building a Drupal 7 site which requires everything to be enabled on install via modules / custom profiles. Below is a content type with some extra fields added using Field API so you can see how they are added. This should go in the module *.install file. We go through the standard process of setting up a content type, and call installed_fields and installed_instances functions.
You might want to rename it from ‘article’ to something else, from what I remember on the standard install profile, Drupal 7 already creates a content type called article.

function article_install() {
  // get the translation function relevant to our current localisation
  $t = get_t();
  // define the content type as an array (same as in hook_node_info())
  $article = array(
    'type' => 'article',
    'name' => $t('Article'),
    'base' => 'node_content',
    'description' => $t('Content type to handle articles.'),
    'body_label' => $t('Article Description'),
    'promote' => 0,
    'status' => 1,
    'comment' => 0,
  );

  // set default values for anything not explicitly defined in the above array
  $content_type = node_type_set_defaults($article);

  // add the body field to the content type
  node_add_body_field($content_type, 'Body');

  // create the content type
  node_type_save($content_type);

  variable_set('node_options_article', array('status'));
  // hide comments for this node. http://api.drupal.org/api/drupal/modules--comment--comment.module/7
  variable_set('comment_article', 'COMMENT_NODE_HIDDEN');

  // Hide date and author information
  variable_set('node_submitted_article', FALSE);

  // Create all the fields we are adding to our content type.
  // http://api.drupal.org/api/function/field_create_field/7
  foreach (_article_installed_fields() as $field) {
    field_create_field($field);
  }

  // Create all the instances for our fields.
  // http://api.drupal.org/api/function/field_create_instance/7
  foreach (_article_installed_instances() as $instance) {
    $instance['entity_type'] = 'node';
    $instance['bundle'] = 'article';
    field_create_instance($instance);
  }

  // adjust the weight so it's called after a dependant module called 'categories'
  $weight = db_query("SELECT weight FROM {system} WHERE name = :name", array(':name' => 'categories'))->fetchField();
  db_update('system')->fields(array(
    'weight' => $weight + 1,
  ))
  ->condition('name', 'article')
  ->execute();
}


function _article_installed_fields() {
  $t = get_t();
  $fields = array(
    // text field
    'article_source' => array(
      'field_name'   => 'article_source',
      'label'        => $t('Artcile Source'),
      'cardinality'  => 1,
      'type'         => 'text',
      'settings'     => array(
        'max_length'  => 1000,
      ),
    ),
    // taxonomy term reference field, referencing a vocabulary called 'authors'
    'article_author' => array(
      'field_name' => 'article_author',
      'type' => 'taxonomy_term_reference',
      'cardinality' => FIELD_CARDINALITY_UNLIMITED,
      'settings' => array(
        'allowed_values' => array(
          array(
            'vocabulary' => 'authors',
            'parent' => 0,
          ),
        ),
      ),
    ),
      // node refererence auto complete field (see the instance), referencing a content-type called 'work'
    'article_work_ref' => array(
      'field_name'  => 'article_work_ref',
      'label'       => $t('Work refrerence'),
      'cardinality' => FIELD_CARDINALITY_UNLIMITED,
      'type'        => 'node_reference',
      'settings'    => array(
        'referenceable_types'  => array('work'),
      ),
    ),
    // a text (textarea) field
    'article_pullquote' => array(
      'field_name'   => 'article_pullquote',
      'label'        => $t('Pull Quote'),
      'cardinality'  => 1,
      'type'         => 'text',
      'settings'     => array(
        'max_length'  => 1000,
      ),
    ),
    // image field
    'article_image' => array(
      'field_name' => 'article_image',
      'label' => $t('Image'),
      'cardinality' => 1,
      'type' => 'image',
      'settings' => array(
        'default_image' => 0,
        'uri_scheme' => 'public',
      ),
    ),
    // date field (date module required)
    'article_date' => array(
      'field_name'   => 'article_date',
      'label'        => $t('Date'),
      'cardinality'  => 1,
      'type'         => 'date',
    ),
  );
  return $fields;
}


function _article_installed_instances() {
  $t = get_t();
  $instances = array(
    // instance of the text field above
    'article_source' => array(
      'field_name'  => 'article_source',
      'label'       => $t('Article Source'),
      'cardinality' => 1,
      'widget'      => array(
        'type'       => 'text_textfield',
        'settings'   => array('size' => 60),
      ),
    ),
    // instance of the taxonomy term reference field above
    'article_author' => array(
      'field_name' => 'article_author',
      'entity_type' => 'node',
      'label' => $t('Author'),
      'bundle' => 'article',
      'required' => FALSE,
      'widget' => array(
        'type' => 'options_select',
      ),
    ),
      // instance of the node reference 'work' auto complete field above
    'article_work_ref' => array(
      'field_name'  => 'article_work_ref',
      'label'       => $t('Work refrerence'),
      'cardinality' => FIELD_CARDINALITY_UNLIMITED,
      'widget'      => array(
        'type'          => 'node_reference_autocomplete',
      ),
    ),
    // instance of the textarea field above
    'article_pullquote' => array(
      'field_name'  => 'article_pullquote',
      'label'       => $t('Pull Quote'),
      'cardinality' => 1,
      'widget'      => array(
        'type'       => 'text_textarea',
        'settings'   => array('rows' => 5),
      ),
    ),
    // instance of the image field above
    'article_image' => array(
      'field_name' => 'article_image',
      'label' => $t('Image'),
      'cardinality' => 1,
      'type' => 'article_image',
      'settings' => array(
        'alt_field' => 1,
        'file_directory' => 'image',
        'file_extensions' => 'png gif jpg jpeg',
        'max_filesize' => '',
        'max_resolution' => '',
        'min_resolution' => '',
        'title_field' => 1,
        'user_register_form' => FALSE,
      ),
      'widget' => array(
        'settings' => array(
          'preview_image_style' => 'thumbnail',
          'progress_indicator' => 'throbber',
        ),
      ),
      'display' => array(
        'default' => array(
          'label' => 'hidden',
          'type' => 'image',
          'settings' => array('image_style' => 'bfi_common_features_image', 'image_link' => ''),
          'weight' => -1,
        ),
        'teaser' => array(
          'label' => 'hidden',
          'type' => 'image',
          'settings' => array('image_style' => 'thumbnail', 'image_link' => 'content'),
          'weight' => -1,
        ),
      ),
    ),
    // instance of the date field above
    'article_date' => array(
      'field_name'  => 'article_date',
      'label'       => $t('Date'),
      'cardinality' => 1,
      'widget'      => array(
        'type'       => 'date_select',
        'settings'   => array(
          'input_format' => date_default_format('date_select'),
          'increment' => 1,
          'year_range' => '-3:+3',
        ),
        'behaviors' => array(
          'multiple values' => FIELD_BEHAVIOR_CUSTOM,
          'default value' => FIELD_BEHAVIOR_CUSTOM,
        ),
      ),
    ),
  );
  return $instances;
}



function article_uninstall() {
  // Gather all the example content that might have been created while this
  // module was enabled.  Simple selects still use db_query().
  // http://api.drupal.org/api/function/db_query/7
  $sql = 'SELECT nid FROM {node} n WHERE n.type = :type';
  $result = db_query($sql, array(':type' => 'article'));
  $nids = array();
  foreach ($result as $row) {
    $nids[] = $row->nid;
  }

  // Delete all the nodes at once
  // http://api.drupal.org/api/function/node_delete_multiple/7
  node_delete_multiple($nids);


  // Loop over each of the fields defined by this module and delete
  // all instances of the field, their data, and the field itself.
  // http://api.drupal.org/api/function/field_delete_field/7
  foreach (array_keys(_article_installed_fields()) as $field) {
    field_delete_field($field);
  }

  // Delete our content type
  // http://api.drupal.org/api/function/node_type_delete/7
  node_type_delete('article');

  // Purge all field information
  // http://api.drupal.org/api/function/field_purge_batch/7
  field_purge_batch(1000);
}