/**
* Suggest alternative commands for [[$command]] based on string similarity.
*
* Alternatives are searched using the following steps:
*
* - suggest alternatives that begin with `$command`
* - find typos by calculating the Levenshtein distance between the unknown command and all
* available commands. The Levenshtein distance is defined as the minimal number of
* characters you have to replace, insert or delete to transform str1 into str2.
*
* @see http://php.net/manual/en/function.levenshtein.php
* @return array a list of suggested alternatives sorted by similarity.
*/
public function getSuggestedAlternatives()
{
$help = $this->application->createController('help');
if ($help === false) {
return [];
}
/** @var $helpController HelpController */
list($helpController, $actionID) = $help;
$availableActions = [];
$commands = $helpController->getCommands();
foreach ($commands as $command) {
$result = $this->application->createController($command);
if ($result === false) {
continue;
}
// add the command itself (default action)
$availableActions[] = $command;
// add all actions of this controller
/** @var $controller Controller */
list($controller, $actionID) = $result;
$actions = $helpController->getActions($controller);
if (!empty($actions)) {
$prefix = $controller->getUniqueId();
foreach ($actions as $action) {
$availableActions[] = $prefix . '/' . $action;
}
}
}
return $this->filterBySimilarity($availableActions, $this->command);
}
