(function () {
    // get link title
    let title = document.getElementsByTagName("title")[0].innerHTML;
    title = encodeURIComponent(title);

    // get optional text selection
    let selection = "";
    if (window.getSelection) {
      selection = window.getSelection().toString();
    } else if (document.selection && document.selection.type !== "Control") {
      selection = document.selection.createRange().text;
    }
    selection = encodeURIComponent(selection);

    // generate share URL
    const url = `https://chringel.dev/share/?title=${title}&text=${selection}&url=+${encodeURIComponent(
      document.location.href
    )}`;

    // open popup window to sharing form
    const opts =
      "resizable,scrollbars,status=0,toolbar=0,menubar=0,titlebar=0,width=680,height=700,location=0";
    window.open(url, "Sharer", opts);
  })();