discourse-custom-header-links/common/header.html

<script type="text/discourse-plugin" version="0.8.20">
api.decorateWidget("home-logo:after", helper => {
  const titleVisible = helper.attrs.minimized;
  if (titleVisible) {
    $(".headerLink:not(.keep)").hide();
  } else {
    $(".headerLink").show();
  }
});

var chl = settings.Custom_header_links;

chl.split("|").map(i => {
  var seg = $.map(i.split(","), $.trim),
    trgt = seg[4],
    keep = seg[5];

  if (trgt == "self") {
    seg[4] = "";
  } else {
    seg[4] = "_blank";
  }

  if (keep != "keep") {
    seg[5] = "";
  }

  api.decorateWidget("header-buttons:before", helper => {
    return helper.h(
      "li.headerLink." + seg[3] + "." + seg[5],
      helper.h(
        "a",
        {
          href: seg[2],
          title: seg[1],
          target: seg[4]
        },
        seg[0]
      )
    );
  });
});
</script>