function loadOptions()

in src/js/bun/sql.ts [209:270]

• 54 lines of code
• 54 McCabe index (conditional complexity)

function loadOptions(o) {
  var hostname, port, username, password, database, tls, url, query, adapter;
  const env = Bun.env;

  if (o === undefined || (typeof o === "string" && o.length === 0)) {
    const urlString = env.POSTGRES_URL || env.DATABASE_URL || env.PGURL || env.PG_URL;
    if (urlString) {
      url = new URL(urlString);
      o = {};
    }
  } else if (o && typeof o === "object") {
    if (o instanceof URL) {
      url = o;
    } else if (o?.url) {
      const _url = o.url;
      if (typeof _url === "string") {
        url = new URL(_url);
      } else if (_url && typeof _url === "object" && _url instanceof URL) {
        url = _url;
      }
    }
  } else if (typeof o === "string") {
    url = new URL(o);
  }

  if (url) {
    ({ hostname, port, username, password, protocol: adapter } = o = url);
    if (adapter[adapter.length - 1] === ":") {
      adapter = adapter.slice(0, -1);
    }
    const queryObject = url.searchParams.toJSON();
    query = "";
    for (const key in queryObject) {
      query += `${encodeURIComponent(key)}=${encodeURIComponent(queryObject[key])} `;
    }
    query = query.trim();
  }

  if (!o) {
    o = {};
  }

  hostname ||= o.hostname || o.host || env.PGHOST || "localhost";
  port ||= Number(o.port || env.PGPORT || 5432);
  username ||= o.username || o.user || env.PGUSERNAME || env.PGUSER || env.USER || env.USERNAME || "postgres";
  database ||= o.database || o.db || (url?.pathname ?? "").slice(1) || env.PGDATABASE || username;
  password ||= o.password || o.pass || env.PGPASSWORD || "";
  tls ||= o.tls || o.ssl;
  adapter ||= o.adapter || "postgres";

  port = Number(port);

  if (!Number.isSafeInteger(port) || port < 1 || port > 65535) {
    throw new Error(`Invalid port: ${port}`);
  }

  if (adapter && !(adapter === "postgres" || adapter === "postgresql")) {
    throw new Error(`Unsupported adapter: ${adapter}. Only \"postgres\" is supported for now`);
  }

  return { hostname, port, username, password, database, tls, query };
}