<?php

/**
 * Read the updates file, and return already done updates.
 *
 * @param string $updatesFilepath Updates file path.
 *
 * @return array Already done update methods.
 */
function read_updates_file($updatesFilepath)
{
    if (! empty($updatesFilepath) && is_file($updatesFilepath)) {
        $content = file_get_contents($updatesFilepath);
        if (! empty($content)) {
            return explode(';', $content);
        }
    }
    return array();
}

/**
 * Write updates file.
 *
 * @param string $updatesFilepath Updates file path.
 * @param array  $updates         Updates array to write.
 *
 * @throws Exception Couldn't write version number.
 */
function write_updates_file($updatesFilepath, $updates)
{
    if (empty($updatesFilepath)) {
        throw new Exception(t('Updates file path is not set, can\'t write updates.'));
    }

    $res = file_put_contents($updatesFilepath, implode(';', $updates));
    if ($res === false) {
        throw new Exception(t('Unable to write updates in '. $updatesFilepath . '.'));
    }
}