.admin.inc

<?php

/**
 * @file
 *   To implement admin configurations for landing pages.
 */

/**
 * Callback from landing_page_menu().
 * Form to processes all tpl files.
 */
function landing_page_templates_form($form, &$form_state) {
  $form['submit'] = array(
    '#type' => 'submit',
    '#value' => 'Submit',
  );
  return $form;
}

/**
 * Callback for admin configuration form.
 */
function landing_page_templates_form_submit($form, &$form_state) {

  // Call function to list all the template files.
  $templates = landing_page_templates_list();
  return $templates;
  drupal_set_message('Templates configuration is up to date');
}

/**
 * Get the type from all the tpl files in
 * the template folder.
 *
 * @return array
 *   An associative array with the type of
 *   the templates files available.
 */
function landing_page_get_templates() {
  $template_type = array();

  // Get all files inside templates folder
  // of landing_page module.
  $theme_path = 'sites/all/modules/custom/landing_page/templates';
  $template_files = glob($theme_path . '/*');

  // Templates files follows the pattern, landing-page-{type}.tpl.
  // Get the type from the tpl files in key value pair.
  foreach ($template_files as $key => $value) {
    $template = basename($value);
    $template_name = str_replace('landing-page-', '', $template);
    $template_type = str_replace('.tpl', '', $template_name);

    // Make the key same as that of the value.
    $newkey = $template_type;
    $template_files[$newkey] = $template_type;
    unset($template_files[$key]);
  }
  return $template_files;
}

/**
 * Get the template list.
 *
 * @return array
 *   An associative array with the type of
 *   the templates files available.
 */
function landing_page_templates_list() {

  // Assign the default template as an array, also
  // get the custom templates array.
  // Merge both the arrays to the template list.
  $default_template = array('default' => 'default');
  $custom_template = landing_page_get_templates();
  $template_list = array_merge($default_template, $custom_template);
  return $template_list;
}