GreenCape/phing-tasks

<?php

namespace GreenCape\PhingTasks;

class JoomlaVersionsTask extends \Task
{
    protected $file = 'versions.json';

    public function setVersionFile($file)
    {
        $this->file = $file;
    }

    public function main()
    {
        // GreenCape first, so entries get overwritten if provided by Joomla
        $repos = array(
            'greencape/joomla-legacy',
            'joomla/joomla-cms',
        );

        $versions = array();
        foreach ($repos as $repo)
        {
            $command = "git ls-remote https://github.com/{$repo}.git | grep -E 'refs/(tags|heads)' | grep -v '{}'";
            $result  = shell_exec($command);
            $refs    = explode(PHP_EOL, $result);
            $pattern = '/^[0-9a-f]+\s+refs\/(heads|tags)\/([a-z0-9\.\-_]+)$/im';
            foreach ($refs as $ref)
            {
                if (preg_match($pattern, $ref, $match))
                {
                    if ($match[1] == 'tags')
                    {
                        if (!preg_match('/^\d+\.\d+\.\d+$/m', $match[2]))
                        {
                            continue;
                        }
                        $parts = explode('.', $match[2]);
                        $this->checkAlias($versions, $parts[0], $match[2]);
                        $this->checkAlias($versions, $parts[0] . '.' . $parts[1], $match[2]);
                        $this->checkAlias($versions, 'latest', $match[2]);
                    }
                    $versions[$match[1]][$match[2]] = $repo;
                }
            }
        }

        // Special case: 1.6 and 1.7 belong to 2.x
        $versions['alias']['1'] = $versions['alias']['1.5'];

        file_put_contents($this->file, json_encode($versions, JSON_PRETTY_PRINT));
    }

    /**
     * @param $versions
     * @param $alias
     * @param $version
     *
     * @return mixed
     */
    protected function checkAlias(&$versions, $alias, $version)
    {
        if (!isset($versions['alias'][$alias]) || version_compare($versions['alias'][$alias], $version, '<'))
        {
            $versions['alias'][$alias] = $version;
        }
    }
}