<?php

// redirect /?s to /search/
// http://txfx.net/wordpress-plugins/nice-search/
function roots_nice_search_redirect() {
  if (is_search() && strpos($_SERVER['REQUEST_URI'], '/wp-admin/') === false && strpos($_SERVER['REQUEST_URI'], '/search/') === false) {
    wp_redirect(home_url('/search/' . str_replace(array(' ', '%20'), array('+', '+'), urlencode(get_query_var('s')))), 301);
      exit();
  }
}

add_action('template_redirect', 'roots_nice_search_redirect');

function roots_search_query($escaped = true) {
  $query = apply_filters('roots_search_query', get_query_var('s'));
  if ($escaped) {
      $query = esc_attr($query);
  }
  return urldecode($query);
}

add_filter('get_search_query', 'roots_search_query');

// fix for empty search query
// http://wordpress.org/support/topic/blank-search-sends-you-to-the-homepage#post-1772565
function roots_request_filter($query_vars) {
  if (isset($_GET['s']) && empty($_GET['s'])) {
    $query_vars['s'] = " ";
  }
  return $query_vars;
}

add_filter('request', 'roots_request_filter');

// root relative URLs for everything
// inspired by http://www.456bereastreet.com/archive/201010/how_to_make_wordpress_urls_root_relative/
// thanks to Scott Walkinshaw (scottwalkinshaw.com)
function roots_root_relative_url($input) {
  $output = preg_replace_callback(
    '!(https?://[^/|"]+)([^"]+)?!',
    create_function(
      '$matches',
      // if full URL is site_url, return a slash for relative root
      'if (isset($matches[0]) && $matches[0] === site_url()) { return "/";' .
      // if domain is equal to site_url, then make URL relative
      '} elseif (isset($matches[0]) && strpos($matches[0], site_url()) !== false) { return $matches[2];' .
      // if domain is not equal to site_url, do not make external link relative
      '} else { return $matches[0]; };'
    ),
    $input
  );
  return $output;
}

// Terrible workaround to remove the duplicate subfolder in the src of JS/CSS tags
// Example: /subfolder/subfolder/css/style.css
function roots_fix_duplicate_subfolder_urls($input) {
  $output = roots_root_relative_url($input);
  preg_match_all('!([^/]+)/([^/]+)!', $output, $matches);
  if (isset($matches[1]) && isset($matches[2])) {
    if ($matches[1][0] === $matches[2][0]) {
      $output = substr($output, strlen($matches[1][0]) + 1);
    }
  }
  return $output;
}

if (!is_admin() && !in_array($GLOBALS['pagenow'], array('wp-login.php', 'wp-register.php'))) {
  add_filter('bloginfo_url', 'roots_root_relative_url');
  add_filter('theme_root_uri', 'roots_root_relative_url');
  add_filter('stylesheet_directory_uri', 'roots_root_relative_url');
  add_filter('template_directory_uri', 'roots_root_relative_url');
  add_filter('script_loader_src', 'roots_fix_duplicate_subfolder_urls');
  add_filter('style_loader_src', 'roots_fix_duplicate_subfolder_urls');
  add_filter('plugins_url', 'roots_root_relative_url');
  add_filter('the_permalink', 'roots_root_relative_url');
  add_filter('wp_list_pages', 'roots_root_relative_url');
  add_filter('wp_list_categories', 'roots_root_relative_url');
  add_filter('wp_nav_menu', 'roots_root_relative_url');
  add_filter('the_content_more_link', 'roots_root_relative_url');
  add_filter('the_tags', 'roots_root_relative_url');
  add_filter('get_pagenum_link', 'roots_root_relative_url');
  add_filter('get_comment_link', 'roots_root_relative_url');
  add_filter('month_link', 'roots_root_relative_url');
  add_filter('day_link', 'roots_root_relative_url');
  add_filter('year_link', 'roots_root_relative_url');
  add_filter('tag_link', 'roots_root_relative_url');
  add_filter('the_author_posts_link', 'roots_root_relative_url');
}

// remove root relative URLs on any attachments in the feed
function roots_root_relative_attachment_urls() {
  if (!is_feed()) {
    add_filter('wp_get_attachment_url', 'roots_root_relative_url');
    add_filter('wp_get_attachment_link', 'roots_root_relative_url');
  }
}

add_action('pre_get_posts', 'roots_root_relative_attachment_urls');

// set lang="en" as default (rather than en-US)
function roots_language_attributes() {
  $attributes = array();
  $output = '';
  if (function_exists('is_rtl')) {
    if (is_rtl() == 'rtl') {
      $attributes[] = 'dir="rtl"';
    }
  }

  $lang = get_bloginfo('language');
  if ($lang && $lang !== 'en-US') {
    $attributes[] = "lang=\"$lang\"";
  } else {
    $attributes[] = 'lang="en"';
  }

  $output = implode(' ', $attributes);
  $output = apply_filters('roots_language_attributes', $output);
  return $output;
}

add_filter('language_attributes', 'roots_language_attributes');

// remove WordPress version from RSS feed
function roots_no_generator() { return ''; }
add_filter('the_generator', 'roots_no_generator');

// cleanup wp_head
function roots_noindex() {
  if (get_option('blog_public') === '0') {
    echo '<meta name="robots" content="noindex,nofollow">', "\n";
  }
}

function roots_rel_canonical() {
  if (!is_singular()) {
    return;
  }

  global $wp_the_query;
  if (!$id = $wp_the_query->get_queried_object_id()) {
    return;
  }

  $link = get_permalink($id);
  echo "\t<link rel=\"canonical\" href=\"$link\">\n";
}

// remove CSS from recent comments widget
function roots_remove_recent_comments_style() {
  global $wp_widget_factory;
  if (isset($wp_widget_factory->widgets['WP_Widget_Recent_Comments'])) {
    remove_action('wp_head', array($wp_widget_factory->widgets['WP_Widget_Recent_Comments'], 'recent_comments_style'));
  }
}

// remove CSS from gallery
function roots_gallery_style($css) {
  return preg_replace("!<style type='text/css'>(.*?)</style>!s", '', $css);
}

function roots_head_cleanup() {
  // http://wpengineer.com/1438/wordpress-header/
  remove_action('wp_head', 'feed_links', 2);
  remove_action('wp_head', 'feed_links_extra', 3);
  remove_action('wp_head', 'rsd_link');
  remove_action('wp_head', 'wlwmanifest_link');
  remove_action('wp_head', 'index_rel_link');
  remove_action('wp_head', 'parent_post_rel_link', 10, 0);
  remove_action('wp_head', 'start_post_rel_link', 10, 0);
  remove_action('wp_head', 'adjacent_posts_rel_link_wp_head', 10, 0);
  remove_action('wp_head', 'wp_generator');
  remove_action('wp_head', 'wp_shortlink_wp_head', 10, 0);
  remove_action('wp_head', 'noindex', 1);
  add_action('wp_head', 'roots_noindex');
  add_action('wp_head', 'roots_remove_recent_comments_style', 1);
  add_filter('gallery_style', 'roots_gallery_style');

  if (!class_exists('WPSEO_Frontend')) {
    remove_action('wp_head', 'rel_canonical');
    add_action('wp_head', 'roots_rel_canonical');
  }

  // deregister l10n.js (new since WordPress 3.1)
  // why you might want to keep it: http://wordpress.stackexchange.com/questions/5451/what-does-l10n-js-do-in-wordpress-3-1-and-how-do-i-remove-it/5484#5484
  // don't load jQuery through WordPress since it's linked in header.php
  if (!is_admin()) {
    wp_deregister_script('l10n');
    wp_deregister_script('jquery');
    wp_register_script('jquery', '', '', '', true);
  }
}

add_action('init', 'roots_head_cleanup');

// cleanup gallery_shortcode()
function roots_gallery_shortcode($attr) {
  global $post, $wp_locale;

  static $instance = 0;
  $instance++;

  // Allow plugins/themes to override the default gallery template.
  $output = apply_filters('post_gallery', '', $attr);
  if ($output != '') {
    return $output;
  }

  // We're trusting author input, so let's at least make sure it looks like a valid orderby statement
  if (isset($attr['orderby'])) {
    $attr['orderby'] = sanitize_sql_orderby($attr['orderby']);
    if (!$attr['orderby']) {
      unset($attr['orderby']);
    }
  }

  extract(shortcode_atts(array(
    'order'      => 'ASC',
    'orderby'    => 'menu_order ID',
    'id'         => $post->ID,
    'icontag'    => 'li',
    'captiontag' => 'p',
    'columns'    => 3,
    'size'       => 'thumbnail',
    'include'    => '',
    'exclude'    => ''
  ), $attr));

  $id = intval($id);
  if ('RAND' == $order) {
    $orderby = 'none';
  }

  if (!empty($include)) {
    $include = preg_replace( '/[^0-9,]+/', '', $include );
    $_attachments = get_posts( array('include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );

    $attachments = array();
    foreach ($_attachments as $key => $val) {
      $attachments[$val->ID] = $_attachments[$key];
    }
  } elseif (!empty($exclude)) {
    $exclude = preg_replace('/[^0-9,]+/', '', $exclude);
    $attachments = get_children(array('post_parent' => $id, 'exclude' => $exclude, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby));
  } else {
    $attachments = get_children(array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby));
  }

  if (empty($attachments)) {
    return '';
  }

  if (is_feed()) {
    $output = "\n";
    foreach ($attachments as $att_id => $attachment)
      $output .= wp_get_attachment_link($att_id, $size, true) . "\n";
    return $output;
  }

  $captiontag = tag_escape($captiontag);
  $columns = intval($columns);
  $itemwidth = $columns > 0 ? floor(100/$columns) : 100;
  $float = is_rtl() ? 'right' : 'left';

  $selector = "gallery-{$instance}";

  $gallery_style = $gallery_div = '';
  if (apply_filters('use_default_gallery_style', true)) {
    $gallery_style = "";
  }
  $size_class = sanitize_html_class($size);
  $gallery_div = "<ul id='$selector' class='thumbnails gallery galleryid-{$id} gallery-columns-{$columns} gallery-size-{$size_class}'>";
  $output = apply_filters('gallery_style', $gallery_style . "\n\t\t" . $gallery_div);

  $i = 0;
  foreach ($attachments as $id => $attachment) {
    $link = isset($attr['link']) && 'file' == $attr['link'] ? wp_get_attachment_link($id, $size, false, false) : wp_get_attachment_link($id, $size, true, false);

    $output .= "
      <{$icontag} class=\"gallery-item\">
        $link
      ";
    if ($captiontag && trim($attachment->post_excerpt)) {
      $output .= "
        <{$captiontag} class=\"gallery-caption hidden\">
        " . wptexturize($attachment->post_excerpt) . "
        </{$captiontag}>";
    }
    $output .= "</{$icontag}>";
    if ($columns > 0 && ++$i % $columns == 0) {
      $output .= '';
    }
  }

  $output .= "</ul>\n";

  return $output;
}

remove_shortcode('gallery');
add_shortcode('gallery', 'roots_gallery_shortcode');

function roots_attachment_link_class($html) {
  $postid = get_the_ID();
  $html = str_replace('<a', '<a class="thumbnail"', $html);
  return $html;
}
add_filter('wp_get_attachment_link', 'roots_attachment_link_class', 10, 1);

// http://justintadlock.com/archives/2011/07/01/captions-in-wordpress
function roots_caption($output, $attr, $content) {
  /* We're not worried abut captions in feeds, so just return the output here. */
  if ( is_feed()) {
    return $output;
  }

  /* Set up the default arguments. */
  $defaults = array(
    'id' => '',
    'align' => 'alignnone',
    'width' => '',
    'caption' => ''
  );

  /* Merge the defaults with user input. */
  $attr = shortcode_atts($defaults, $attr);

  /* If the width is less than 1 or there is no caption, return the content wrapped between the [caption]< tags. */
  if (1 > $attr['width'] || empty($attr['caption'])) {
    return $content;
  }

  /* Set up the attributes for the caption <div>. */
  $attributes = (!empty($attr['id']) ? ' id="' . esc_attr($attr['id']) . '"' : '' );
  $attributes .= ' class="thumbnail wp-caption ' . esc_attr($attr['align']) . '"';
  $attributes .= ' style="width: ' . esc_attr($attr['width']) . 'px"';

  /* Open the caption <div>. */
  $output = '<div' . $attributes .'>';

  /* Allow shortcodes for the content the caption was created for. */
  $output .= do_shortcode($content);

  /* Append the caption text. */
  $output .= '<div class="caption"><p class="wp-caption-text">' . $attr['caption'] . '</p></div>';

  /* Close the caption </div>. */
  $output .= '</div>';

  /* Return the formatted, clean caption. */
  return $output;
}

add_filter('img_caption_shortcode', 'roots_caption', 10, 3);


// http://www.deluxeblogtips.com/2011/01/remove-dashboard-widgets-in-wordpress.html
function roots_remove_dashboard_widgets() {
  remove_meta_box('dashboard_incoming_links', 'dashboard', 'normal');
  remove_meta_box('dashboard_plugins', 'dashboard', 'normal');
  remove_meta_box('dashboard_primary', 'dashboard', 'normal');
  remove_meta_box('dashboard_secondary', 'dashboard', 'normal');
}

add_action('admin_init', 'roots_remove_dashboard_widgets');

// excerpt cleanup
function roots_excerpt_length($length) {
  return POST_EXCERPT_LENGTH;
}

function roots_excerpt_more($more) {
  return ' &hellip; <a href="' . get_permalink() . '">' . __( 'Continued', 'roots' ) . '</a>';
}

add_filter('excerpt_length', 'roots_excerpt_length');
add_filter('excerpt_more', 'roots_excerpt_more');

class Roots_Nav_Walker extends Walker_Nav_Menu {
  function check_current($val) {
    return preg_match('/(current-)/', $val);
  }

  function start_el(&$output, $item, $depth, $args) {
    global $wp_query;
    $indent = ($depth) ? str_repeat("\t", $depth) : '';

    $slug = sanitize_title($item->title);

    $class_names = $value = '';
    $classes = empty($item->classes) ? array() : (array) $item->classes;

    $classes = array_filter($classes, array(&$this, 'check_current'));

    $class_names = join(' ', apply_filters('nav_menu_css_class', array_filter($classes), $item));
    $class_names = $class_names ? ' class="' . esc_attr($class_names) . '"' : '';

    $id = apply_filters('nav_menu_item_id', 'menu-' . $slug, $item, $args);
    $id = strlen($id) ? ' id="' . esc_attr( $id ) . '"' : '';

    $output .= $indent . '<li' . $id . $class_names . '>';

    $attributes  = ! empty($item->attr_title) ? ' title="'  . esc_attr($item->attr_title) .'"' : '';
    $attributes .= ! empty($item->target)     ? ' target="' . esc_attr($item->target    ) .'"' : '';
    $attributes .= ! empty($item->xfn)        ? ' rel="'    . esc_attr($item->xfn       ) .'"' : '';
    $attributes .= ! empty($item->url)        ? ' href="'   . esc_attr($item->url       ) .'"' : '';

    $item_output = $args->before;
    $item_output .= '<a'. $attributes .'>';
    $item_output .= $args->link_before . apply_filters('the_title', $item->title, $item->ID) . $args->link_after;
    $item_output .= '</a>';
    $item_output .= $args->after;

    $output .= apply_filters('walker_nav_menu_start_el', $item_output, $item, $depth, $args);
  }
}

class Roots_Navbar_Nav_Walker extends Walker_Nav_Menu {
  function check_current($val) {
    return preg_match('/(current-)|active|dropdown/', $val);
  }

  function start_lvl(&$output, $depth) {
    $output .= "\n<ul class=\"dropdown-menu\">\n";
  }

  function start_el(&$output, $item, $depth, $args) {
    global $wp_query;
    $indent = ($depth) ? str_repeat("\t", $depth) : '';

    $slug = sanitize_title($item->title);

    $li_attributes = '';
    $class_names = $value = '';

    $classes = empty($item->classes) ? array() : (array) $item->classes;
    if ($args->has_children) {
      $classes[]      = 'dropdown';
      $li_attributes .= 'data-dropdown="dropdown"';
    }
    $classes[] = ($item->current) ? 'active' : '';
    $classes = array_filter($classes, array(&$this, 'check_current'));

    $class_names = join(' ', apply_filters('nav_menu_css_class', array_filter($classes), $item));
    $class_names = $class_names ? ' class="' . esc_attr($class_names) . '"' : '';

    $id = apply_filters('nav_menu_item_id', 'menu-' . $slug, $item, $args);
    $id = strlen($id) ? ' id="' . esc_attr( $id ) . '"' : '';

    $output .= $indent . '<li' . $id . $class_names . $li_attributes . '>';

    $attributes  = ! empty($item->attr_title) ? ' title="'  . esc_attr($item->attr_title) .'"'    : '';
    $attributes .= ! empty($item->target)     ? ' target="' . esc_attr($item->target    ) .'"'    : '';
    $attributes .= ! empty($item->xfn)        ? ' rel="'    . esc_attr($item->xfn       ) .'"'    : '';
    $attributes .= ! empty($item->url)        ? ' href="'   . esc_attr($item->url       ) .'"'    : '';
    $attributes .= ($args->has_children)      ? ' class="dropdown-toggle" data-toggle="dropdown"' : '';

    $item_output = $args->before;
    $item_output .= '<a'. $attributes .'>';
    $item_output .= $args->link_before . apply_filters('the_title', $item->title, $item->ID) . $args->link_after;
    $item_output .= ($args->has_children) ? ' <b class="caret"></b>' : '';
    $item_output .= '</a>';
    $item_output .= $args->after;

    $output .= apply_filters('walker_nav_menu_start_el', $item_output, $item, $depth, $args);
  }
  function display_element($element, &$children_elements, $max_depth, $depth = 0, $args, &$output) {
    if (!$element) { return; }

    $id_field = $this->db_fields['id'];

    // display this element
    if (is_array($args[0])) {
      $args[0]['has_children'] = !empty($children_elements[$element->$id_field]);
    } elseif (is_object($args[0])) {
      $args[0]->has_children = !empty($children_elements[$element->$id_field]);
    }
    $cb_args = array_merge(array(&$output, $element, $depth), $args);
    call_user_func_array(array(&$this, 'start_el'), $cb_args);

    $id = $element->$id_field;

    // descend only when the depth is right and there are childrens for this element
    if (($max_depth == 0 || $max_depth > $depth+1) && isset($children_elements[$id])) {
      foreach ($children_elements[$id] as $child) {
        if (!isset($newlevel)) {
          $newlevel = true;
          // start the child delimiter
          $cb_args = array_merge(array(&$output, $depth), $args);
          call_user_func_array(array(&$this, 'start_lvl'), $cb_args);
        }
        $this->display_element($child, $children_elements, $max_depth, $depth + 1, $args, $output);
      }
      unset($children_elements[$id]);
    }

    if (isset($newlevel) && $newlevel) {
      // end the child delimiter
      $cb_args = array_merge(array(&$output, $depth), $args);
      call_user_func_array(array(&$this, 'end_lvl'), $cb_args);
    }

    // end this element
    $cb_args = array_merge(array(&$output, $element, $depth), $args);
    call_user_func_array(array(&$this, 'end_el'), $cb_args);
  }
}

function roots_nav_menu_args($args = '') {
  $args['container']  = false;
  $args['depth']      = 2;
  $args['items_wrap'] = '<ul class="nav">%3$s</ul>';
  if (!$args['walker']) {
    $args['walker'] = new Roots_Nav_Walker();
  }
  return $args;
}

add_filter('wp_nav_menu_args', 'roots_nav_menu_args');

// we don't need to self-close these tags in html5:
// <img>, <input>
function roots_remove_self_closing_tags($input) {
  return str_replace(' />', '>', $input);
}

add_filter('get_avatar', 'roots_remove_self_closing_tags');
add_filter('comment_id_fields', 'roots_remove_self_closing_tags');
add_filter('post_thumbnail_html', 'roots_remove_self_closing_tags');

// check to see if the tagline is set to default
// show an admin notice to update if it hasn't been changed
// you want to change this or remove it because it's used as the description in the RSS feed
function roots_notice_tagline() {
    global $current_user;
    $user_id = $current_user->ID;

    if (!get_user_meta($user_id, 'ignore_tagline_notice')) {
      echo '<div class="error">';
      echo '<p>', sprintf(__('Please update your <a href="%s">site tagline</a> <a href="%s" style="float: right;">Hide Notice</a>', 'roots'), admin_url('options-general.php'), '?tagline_notice_ignore=0'), '</p>';
      echo '</div>';
    }
}

if ((get_option('blogdescription') === 'Just another WordPress site') && isset($_GET['page']) != 'theme_activation_options') {
  add_action('admin_notices', 'roots_notice_tagline');
}

function roots_notice_tagline_ignore() {
  global $current_user;
  $user_id = $current_user->ID;
  if (isset($_GET['tagline_notice_ignore']) && '0' == $_GET['tagline_notice_ignore']) {
    add_user_meta($user_id, 'ignore_tagline_notice', 'true', true);
  }
}

add_action('admin_init', 'roots_notice_tagline_ignore');

// set the post revisions to 5 unless the constant
// was set in wp-config.php to avoid DB bloat
if (!defined('WP_POST_REVISIONS')) { define('WP_POST_REVISIONS', 5); }

// allow more tags in TinyMCE including <iframe> and <script>
function roots_change_mce_options($options) {
  $ext = 'pre[id|name|class|style],iframe[align|longdesc|name|width|height|frameborder|scrolling|marginheight|marginwidth|src],script[charset|defer|language|src|type]';
  if (isset($initArray['extended_valid_elements'])) {
    $options['extended_valid_elements'] .= ',' . $ext;
  } else {
    $options['extended_valid_elements'] = $ext;
  }
  return $options;
}

add_filter('tiny_mce_before_init', 'roots_change_mce_options');

//clean up the default WordPress style tags
add_filter('style_loader_tag', 'roots_clean_style_tag');

function roots_clean_style_tag($input) {
  preg_match_all("!<link rel='stylesheet'\s?(id='[^']+')?\s+href='(.*)' type='text/css' media='(.*)' />!", $input, $matches);
  //only display media if it's print
  $media = $matches[3][0] === 'print' ? ' media="print"' : '';
  return '<link rel="stylesheet" href="' . $matches[2][0] . '"' . $media . '>' . "\n";
}

function roots_body_class() {
  $term = get_queried_object();

  if (is_single()) {
    $cat = get_the_category();
  }

  if(!empty($cat)) {
    return $cat[0]->slug;
  } elseif (isset($term->slug)) {
    return $term->slug;
  } elseif (isset($term->page_name)) {
    return $term->page_name;
  } elseif (isset($term->post_name)) {
    return $term->post_name;
  } else {
    return;
  }
}

// first and last classes for widgets
// http://wordpress.org/support/topic/how-to-first-and-last-css-classes-for-sidebar-widgets
function roots_widget_first_last_classes($params) {
  global $my_widget_num;
  $this_id = $params[0]['id'];
  $arr_registered_widgets = wp_get_sidebars_widgets();

  if (!$my_widget_num) {
    $my_widget_num = array();
  }

  if (!isset($arr_registered_widgets[$this_id]) || !is_array($arr_registered_widgets[$this_id])) {
    return $params;
  }

  if (isset($my_widget_num[$this_id])) {
    $my_widget_num[$this_id] ++;
  } else {
    $my_widget_num[$this_id] = 1;
  }

  $class = 'class="widget-' . $my_widget_num[$this_id] . ' ';

  if ($my_widget_num[$this_id] == 1) {
    $class .= 'widget-first ';
  } elseif ($my_widget_num[$this_id] == count($arr_registered_widgets[$this_id])) {
    $class .= 'widget-last ';
  }

  $params[0]['before_widget'] = str_replace('class="', $class, $params[0]['before_widget']);

  return $params;

}
add_filter('dynamic_sidebar_params', 'roots_widget_first_last_classes');

// apply Bootstrap markup/classes to Gravity Forms (in progress)
if (class_exists('RGForms')) {
  update_option('rg_gforms_disable_css', 1);

  // error message class
  function roots_gform_validation_message($message, $form) {
    $message = '<div class="alert alert-error fade in">';
    $message .= '<a class="close" data-dismiss="alert">×</a>';
    $message .= '<strong>There was a problem with your submission. Errors have been highlighted below.</strong>';
    $message .= '</div>';
    return $message;
  }
  add_filter('gform_validation_message', 'roots_gform_validation_message', 10, 2);

  // field class
  function roots_gform_field_css_class($classes, $field, $form) {
    $classes .= " control-group";
    return $classes;
  }
  add_action('gform_field_css_class', 'roots_gform_field_css_class', 10, 3);

  // button class
  function roots_gform_submit_button($button, $form) {
      return "<button class='btn btn-primary' id='gform_submit_button_{$form["id"]}'><span>Submit</span></button>";
  }
  add_filter('gform_submit_button', 'roots_gform_submit_button', 10, 2);

}

?>