Installer/tools/src/MergeHostsFile.php

<?php

namespace FD3;

use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;

class MergeHostsFile extends Command
{
    protected function configure()
    {
        $this
            ->setName('merge:hostsfile')
            ->setDescription('Merge (or remove) two hostfiles to /etc/hosts.')
            ->setHelp('This command allows you to a new installation...')
            ->addArgument('file', InputArgument::REQUIRED, 'The file to use.')
            ->addOption('dest', null, InputOption::VALUE_REQUIRED, 'The /etc/hosts file where to write', "/etc/hosts")
            ->addOption('ref', null, InputOption::VALUE_REQUIRED, 'The reference to add as a comment to simplify the remove', "handled by fd3")
            ->addOption('del', 'd', InputOption::VALUE_NONE, 'Remove the merged values based on the ref parameter');
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $file = $input->getArgument('file');
        $dest = $input->getOption("dest");
        $id = $input->getOption("ref");
        $del = $input->getOption("del");
        $dest_content = explode("\n", file_get_contents($dest));
        $orig_content = explode("\n", file_get_contents($file));

        foreach ($dest_content as $k => $spect) {
            if (strpos($spect, $id) !== false) {
                unset($dest_content[$k]);
            }
        }
        foreach ($orig_content as $k => $spect) {
            $spect = trim($spect);
            preg_match("|[^\s]*|", $spect, $match);
            if (isset($match[0])) {
                try {
                    $ip = \IP::create($match[0]);
                    $orig_content[$k] = $spect . "\t#$id";
                } catch (\InvalidArgumentException $e) {
                }
            }
        }
        $content = "";
        foreach ($dest_content as $line) {
            $content .= $line . "\n";
        }
        if (!$del) {

            foreach ($orig_content as $line) {
                $content .= $line . "\n";
            }
        }

        file_put_contents($dest, $content);


    }
}