<?php

function phabricator_read_config_file($original_config) {
  $root = dirname(dirname(__FILE__));

  // Accept either "myconfig" (preferred) or "myconfig.conf.php".
  $config = preg_replace('/\.conf\.php$/', '', $original_config);
  $full_config_path = $root.'/conf/'.$config.'.conf.php';

  if (!Filesystem::pathExists($full_config_path)) {
    // These are very old configuration files which we used to ship with
    // by default. File based configuration was de-emphasized once web-based
    // configuration was built. The actual files were removed to reduce
    // user confusion over how to configure Phabricator.

    switch ($config) {
      case 'default':
      case 'production':
        return array();
      case 'development':
        return array(
          'phabricator.developer-mode'      => true,
          'darkconsole.enabled'             => true,
        );
    }

    $files = id(new FileFinder($root.'/conf/'))
      ->withType('f')
      ->withSuffix('conf.php')
      ->withFollowSymlinks(true)
      ->find();

    foreach ($files as $key => $file) {
      $file = trim($file, './');
      $files[$key] = preg_replace('/\.conf\.php$/', '', $file);
    }
    $files = '    '.implode("\n    ", $files);

    throw new Exception(
      pht(
        "CONFIGURATION ERROR\n".
        "Config file '%s' does not exist. Valid config files are:\n\n%s",
        $original_config,
        $files));
  }

  // Make sure config file errors are reported.
  $old_error_level = error_reporting(E_ALL | E_STRICT);
  $old_display_errors = ini_get('display_errors');
  ini_set('display_errors', 1);

    ob_start();
    $conf = include $full_config_path;
    $errors = ob_get_clean();

  error_reporting($old_error_level);
  ini_set('display_errors', $old_display_errors);

  if ($conf === false) {
    throw new Exception(
      pht(
        "Failed to read config file '%s': %s",
        $config,
        $errors));
  }

  return $conf;
}