Platformsh\Cli\Command\Environment\EnvironmentMergeCommand::execute PHP Method

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $this->validateInput($input);
        $selectedEnvironment = $this->getSelectedEnvironment();
        $environmentId = $selectedEnvironment->id;
        if (!$selectedEnvironment->operationAvailable('merge')) {
            $this->stdErr->writeln("Operation not available: The environment <error>{$environmentId}</error> can't be merged.");
            return 1;
        }
        $parentId = $selectedEnvironment->parent;
        $confirmText = "Are you sure you want to merge <info>{$environmentId}</info> with its parent, <info>{$parentId}</info>?";
        if (!$this->getHelper('question')->confirm($confirmText)) {
            return 1;
        }
        $this->stdErr->writeln("Merging <info>{$environmentId}</info> with <info>{$parentId}</info>");
        $this->api()->clearEnvironmentsCache($selectedEnvironment->project);
        $activity = $selectedEnvironment->merge();
        if (!$input->getOption('no-wait')) {
            $success = ActivityUtil::waitAndLog($activity, $this->stdErr, 'Merge complete', 'Merge failed');
            if (!$success) {
                return 1;
            }
        }
        return 0;
    }