think\Console::find PHP Method

    public function find($name)
    {
        $allCommands = array_keys($this->commands);
        $expr = preg_replace_callback('{([^:]+|)}', function ($matches) {
            return preg_quote($matches[1]) . '[^:]*';
        }, $name);
        $commands = preg_grep('{^' . $expr . '}', $allCommands);
        if (empty($commands) || count(preg_grep('{^' . $expr . '$}', $commands)) < 1) {
            if (false !== ($pos = strrpos($name, ':'))) {
                $this->findNamespace(substr($name, 0, $pos));
            }
            $message = sprintf('Command "%s" is not defined.', $name);
            if ($alternatives = $this->findAlternatives($name, $allCommands)) {
                if (1 == count($alternatives)) {
                    $message .= "\n\nDid you mean this?\n    ";
                } else {
                    $message .= "\n\nDid you mean one of these?\n    ";
                }
                $message .= implode("\n    ", $alternatives);
            }
            throw new \InvalidArgumentException($message);
        }
        if (count($commands) > 1) {
            $commandList = $this->commands;
            $commands = array_filter($commands, function ($nameOrAlias) use($commandList, $commands) {
                $commandName = $commandList[$nameOrAlias]->getName();
                return $commandName === $nameOrAlias || !in_array($commandName, $commands);
            });
        }
        $exact = in_array($name, $commands, true);
        if (count($commands) > 1 && !$exact) {
            $suggestions = $this->getAbbreviationSuggestions(array_values($commands));
            throw new \InvalidArgumentException(sprintf('Command "%s" is ambiguous (%s).', $name, $suggestions));
        }
        return $this->get($exact ? $name : reset($commands));
    }