Drupal "Show all" pager

pager_all.php

// Part of pager_all.module Drupal 7

/**
 * Implements hook_custom_theme().
 */
function pager_all_theme() {
  return array(
    'pager_all' => array(
      'variables' => array(),
    )
  );
}


function theme_pager_all($variables) {
  $text = $variables['text'];
  $text_one_page = $variables['text_one_page'];
  $parameters = $variables['parameters'];
  $parameters['show_all'] = !filter_input(INPUT_GET, 'show_all', FILTER_VALIDATE_BOOLEAN);
  $query = drupal_get_query_parameters($parameters, array());
  if ($query_pager = pager_get_query_parameters()) {
    unset($query_pager['show_all']);
    $query = array_merge($query, $query_pager);
  }
  $attributes['href'] = url($_GET['q'], array('query' => $query));
  return '<a' . drupal_attributes($attributes) . '>' . check_plain($parameters['show_all'] ? $text : $text_one_page) . '</a>';
}


/**
 * Implements hook_views_pre_build().
 */
function pager_all_views_pre_build(&$view) {
  if (filter_input(INPUT_GET, 'show_all', FILTER_VALIDATE_BOOLEAN)) {
    $view->set_items_per_page(db_select($view->base_table, 't')->fields('t', array($view->base_field))->execute()->rowCount());
  }
}

template.php

/*
 Override default pager
*/
function THEME_NAME_pager($variables) {
  $tags = $variables['tags'];
  $element = $variables['element'];
  $parameters = $variables['parameters'];
  $quantity = $variables['quantity'];
  global $pager_page_array, $pager_total;

  // Calculate various markers within this pager piece:
  // Middle is used to "center" pages around the current page.
  $pager_middle = ceil($quantity / 2);
  // current is the page we are currently paged to
  $pager_current = $pager_page_array[$element] + 1;
  // first is the first page listed by this pager piece (re quantity)
  $pager_first = $pager_current - $pager_middle + 1;
  // last is the last page listed by this pager piece (re quantity)
  $pager_last = $pager_current + $quantity - $pager_middle;
  // max is the maximum page number
  $pager_max = $pager_total[$element];
  // End of marker calculations.

  // Prepare for generation loop.
  $i = $pager_first;
  if ($pager_last > $pager_max) {
    // Adjust "center" if at end of query.
    $i = $i + ($pager_max - $pager_last);
    $pager_last = $pager_max;
  }
  if ($i <= 0) {
    // Adjust "center" if at start of query.
    $pager_last = $pager_last + (1 - $i);
    $i = 1;
  }
  // End of generation loop preparation.

  $li_first = theme('pager_first', array('text' => (isset($tags[0]) ? $tags[0] : t('« first')), 'element' => $element, 'parameters' => $parameters));
  $li_previous = theme('pager_previous', array('text' => (isset($tags[1]) ? $tags[1] : t('‹ previous')), 'element' => $element, 'interval' => 1, 'parameters' => $parameters));
  $li_next = theme('pager_next', array('text' => (isset($tags[3]) ? $tags[3] : t('next ›')), 'element' => $element, 'interval' => 1, 'parameters' => $parameters));
  $li_last = theme('pager_last', array('text' => (isset($tags[4]) ? $tags[4] : t('last »')), 'element' => $element, 'parameters' => $parameters));

  if (!$li_first) { $li_first = sprintf('<span class="disabled">%s</span>', (isset($tags[0]) ? $tags[0] : t('« first')));}
  if (!$li_previous) { $li_previous = sprintf('<span class="disabled">%s</span>', (isset($tags[1]) ? $tags[1] : t('‹ previous')));}
  if (!$li_next) { $li_next = sprintf('<span class="disabled">%s</span>', (isset($tags[3]) ? $tags[3] : t('next ›')));}
  if (!$li_last) { $li_last = sprintf('<span class="disabled">%s</span>', (isset($tags[4]) ? $tags[4] : t('last »')));}

  $show_active_pager = $pager_total[$element] > 1;
  $show_static_pager = filter_input(INPUT_GET, 'show_all', FILTER_VALIDATE_BOOLEAN);

  if ($li_first) {
    $items[] = array(
      'class' => array('pager-first'),
      'data' => $li_first,
    );
  }
  if ($li_previous) {
    $items[] = array(
      'class' => array('pager-previous'),
      'data' => $li_previous,
    );
  }

  if ($show_active_pager) {
    if ($i != $pager_max) {
      if ($i > 1) {
        $items[] = array(
          'class' => array('pager-ellipsis'),
          'data' => '…',
        );
      }
      // Now generate the actual pager piece.
      for (; $i <= $pager_last && $i <= $pager_max; $i++) {
        if ($i < $pager_current) {
          $items[] = array(
            'class' => array('pager-item'),
            'data' => theme('pager_previous', array('text' => $i, 'element' => $element, 'interval' => ($pager_current - $i), 'parameters' => $parameters)),
          );
        }
        if ($i == $pager_current) {
          $items[] = array(
            'class' => array('pager-current'),
            'data' => $i,
          );
        }
        if ($i > $pager_current) {
          $items[] = array(
            'class' => array('pager-item'),
            'data' => theme('pager_next', array('text' => $i, 'element' => $element, 'interval' => ($i - $pager_current), 'parameters' => $parameters)),
          );
        }
      }
      if ($i < $pager_max) {
        $items[] = array(
          'class' => array('pager-ellipsis'),
          'data' => '…',
        );
      }
    }
  } else {
    $items[] = array(
      'class' => array('pager-current'),
      'data' => 1,
    );
  }

  if ($li_next) {
    $items[] = array(
      'class' => array('pager-next'),
      'data' => $li_next,
    );
  }
  if ($li_last) {
    $items[] = array(
      'class' => array('pager-last'),
      'data' => $li_last,
    );
  }
  // Show all
  $items[] = array(
    'class' => array('pager-all'),
    'data' => theme('pager_all', array('text' => t('All'), 'text_one_page' => t('By pages'), 'element' => $element, 'parameters' => $parameters)),
  );

  if ($show_active_pager) {
    return '<h2 class="element-invisible">' . t('Pages') . '</h2>' . theme('item_list', array(
      'items' => $items,
      'attributes' => array('class' => array('pager')),
    ));
  } elseif ($show_static_pager) {
    return '<h2 class="element-invisible">' . t('Pages') . '</h2>' . theme('item_list', array(
      'items' => $items,
      'attributes' => array('class' => array('pager')),
    ));
  }
}