materio-base-d7/materio_search_api.admin.inc

<?php

function materio_search_api_settings(){
	$indexes = search_api_index_load_multiple(false);
	// dsm($indexes, '$indexes');

	foreach ($indexes as $machine_name => $index) {
		if($index->status == 1)
			$index_options[$index->machine_name] = $index->name;
	}		

	$form['mainsearchindex'] = array(
		'#type'=>'select',
		'#options'=>$index_options,
		'#default_value' => variable_get('mainsearchindex', -1),
		'#title' => t('Main search api index'),
	);

	$form['autocompletesearchindex'] = array(
		'#type'=>'select',
		'#options'=>$index_options,
		'#default_value' => variable_get('autocompletesearchindex', -1),
		'#title' => t('Autocomplete search api index'),
	);

	// TODO:  select the activated viewmodes for change view mode and selected view mode  
	$entity_infos = entity_get_info();
  // dsm($entity_infos, 'entity_infos');
  foreach ($entity_infos['node']['view modes'] as $viewmode => $value) {
  	$viewmode_options[$viewmode] = $value['label'];
  }

	$form['availableviewmodes'] = array(
		'#type'=>'select',
		'#options'=>$viewmode_options,
		'#default_value' => variable_get('availableviewmodes', -1),
		'#title' => t('Availble View modes'),
		'#multiple' => true,
	);

	$form['defaultviewmode'] = array(
		'#type'=>'select',
		'#options'=>$viewmode_options,
		'#default_value' => variable_get('defaultviewmode', 'full'),
		'#title' => t('Defalut View mode'),
	);

	return system_settings_form($form);
}