Website: Set up our GoatCounter instance

website/.vitepress/config.mjs

@@ -145,6 +145,14 @@ export default withMermaid(
       ["meta", { property: "og:image:type", content: "image/png" }],
       ["meta", { property: "og:image:width", content: "1280" }],
       ["meta", { property: "og:image:height", content: "640" }],
+      [
+        "script",
+        {
+          "data-goatcounter": "https://gc-scarb.swmtest.xyz/count",
+          async: true,
+          src: `${base}count.js`,
+        },
+      ],
     ],
 
     lastUpdated: true,

website/public/count.js

@@ -0,0 +1,323 @@
+// GoatCounter: https://www.goatcounter.com
+// This file is released under the ISC license: https://opensource.org/licenses/ISC
+(function () {
+  "use strict";
+
+  if (window.goatcounter && window.goatcounter.vars)
+    // Compatibility with very old version; do not use.
+    window.goatcounter = window.goatcounter.vars;
+  else window.goatcounter = window.goatcounter || {};
+
+  // Load settings from data-goatcounter-settings.
+  var s = document.querySelector("script[data-goatcounter]");
+  if (s && s.dataset.goatcounterSettings) {
+    try {
+      var set = JSON.parse(s.dataset.goatcounterSettings);
+    } catch (err) {
+      console.error("invalid JSON in data-goatcounter-settings: " + err);
+    }
+    for (var k in set)
+      if (
+        [
+          "no_onload",
+          "no_events",
+          "allow_local",
+          "allow_frame",
+          "path",
+          "title",
+          "referrer",
+          "event",
+        ].indexOf(k) > -1
+      )
+        window.goatcounter[k] = set[k];
+  }
+
+  var enc = encodeURIComponent;
+
+  // Get all data we're going to send off to the counter endpoint.
+  var get_data = function (vars) {
+    var data = {
+      p: vars.path === undefined ? goatcounter.path : vars.path,
+      r: vars.referrer === undefined ? goatcounter.referrer : vars.referrer,
+      t: vars.title === undefined ? goatcounter.title : vars.title,
+      e: !!(vars.event || goatcounter.event),
+      s: [
+        window.screen.width,
+        window.screen.height,
+        window.devicePixelRatio || 1,
+      ],
+      b: is_bot(),
+      q: location.search,
+    };
+
+    var rcb, pcb, tcb; // Save callbacks to apply later.
+    if (typeof data.r === "function") rcb = data.r;
+    if (typeof data.t === "function") tcb = data.t;
+    if (typeof data.p === "function") pcb = data.p;
+
+    if (is_empty(data.r)) data.r = document.referrer;
+    if (is_empty(data.t)) data.t = document.title;
+    if (is_empty(data.p)) data.p = get_path();
+
+    if (rcb) data.r = rcb(data.r);
+    if (tcb) data.t = tcb(data.t);
+    if (pcb) data.p = pcb(data.p);
+    return data;
+  };
+
+  // Check if a value is "empty" for the purpose of get_data().
+  var is_empty = function (v) {
+    return v === null || v === undefined || typeof v === "function";
+  };
+
+  // See if this looks like a bot; there is some additional filtering on the
+  // backend, but these properties can't be fetched from there.
+  var is_bot = function () {
+    // Headless browsers are probably a bot.
+    var w = window,
+      d = document;
+    if (w.callPhantom || w._phantom || w.phantom) return 150;
+    if (w.__nightmare) return 151;
+    if (d.__selenium_unwrapped || d.__webdriver_evaluate || d.__driver_evaluate)
+      return 152;
+    if (navigator.webdriver) return 153;
+    return 0;
+  };
+
+  // Object to urlencoded string, starting with a ?.
+  var urlencode = function (obj) {
+    var p = [];
+    for (var k in obj)
+      if (
+        obj[k] !== "" &&
+        obj[k] !== null &&
+        obj[k] !== undefined &&
+        obj[k] !== false
+      )
+        p.push(enc(k) + "=" + enc(obj[k]));
+    return "?" + p.join("&");
+  };
+
+  // Show a warning in the console.
+  var warn = function (msg) {
+    if (console && "warn" in console) console.warn("goatcounter: " + msg);
+  };
+
+  // Get the endpoint to send requests to.
+  var get_endpoint = function () {
+    var s = document.querySelector("script[data-goatcounter]");
+    if (s && s.dataset.goatcounter) return s.dataset.goatcounter;
+    return goatcounter.endpoint || window.counter; // counter is for compat; don't use.
+  };
+
+  // Get current path.
+  var get_path = function () {
+    var loc = location,
+      c = document.querySelector('link[rel="canonical"][href]');
+    if (c) {
+      // May be relative or point to different domain.
+      var a = document.createElement("a");
+      a.href = c.href;
+      if (
+        a.hostname.replace(/^www\./, "") ===
+        location.hostname.replace(/^www\./, "")
+      )
+        loc = a;
+    }
+    return loc.pathname + loc.search || "/";
+  };
+
+  // Run function after DOM is loaded.
+  var on_load = function (f) {
+    if (document.body === null)
+      document.addEventListener(
+        "DOMContentLoaded",
+        function () {
+          f();
+        },
+        false,
+      );
+    else f();
+  };
+
+  // Filter some requests that we (probably) don't want to count.
+  goatcounter.filter = function () {
+    if (
+      "visibilityState" in document &&
+      document.visibilityState === "prerender"
+    )
+      return "visibilityState";
+    if (!goatcounter.allow_frame && location !== parent.location)
+      return "frame";
+    if (
+      !goatcounter.allow_local &&
+      location.hostname.match(
+        /(localhost$|^127\.|^10\.|^172\.(1[6-9]|2[0-9]|3[0-1])\.|^192\.168\.|^0\.0\.0\.0$)/,
+      )
+    )
+      return "localhost";
+    if (!goatcounter.allow_local && location.protocol === "file:")
+      return "localfile";
+    if (localStorage && localStorage.getItem("skipgc") === "t")
+      return "disabled with #toggle-goatcounter";
+    return false;
+  };
+
+  // Get URL to send to GoatCounter.
+  window.goatcounter.url = function (vars) {
+    var data = get_data(vars || {});
+    if (data.p === null)
+      // null from user callback.
+      return;
+    data.rnd = Math.random().toString(36).substr(2, 5); // Browsers don't always listen to Cache-Control.
+
+    var endpoint = get_endpoint();
+    if (!endpoint) return warn("no endpoint found");
+
+    return endpoint + urlencode(data);
+  };
+
+  // Count a hit.
+  window.goatcounter.count = function (vars) {
+    var f = goatcounter.filter();
+    if (f) return warn("not counting because of: " + f);
+    var url = goatcounter.url(vars);
+    if (!url) return warn("not counting because path callback returned null");
+
+    if (!navigator.sendBeacon(url)) {
+      // This mostly fails due to being blocked by CSP; try again with an
+      // image-based fallback.
+      var img = document.createElement("img");
+      img.src = url;
+      img.style.position = "absolute"; // Affect layout less.
+      img.style.bottom = "0px";
+      img.style.width = "1px";
+      img.style.height = "1px";
+      img.loading = "eager";
+      img.setAttribute("alt", "");
+      img.setAttribute("aria-hidden", "true");
+
+      var rm = function () {
+        if (img && img.parentNode) img.parentNode.removeChild(img);
+      };
+      img.addEventListener("load", rm, false);
+      document.body.appendChild(img);
+    }
+  };
+
+  // Get a query parameter.
+  window.goatcounter.get_query = function (name) {
+    var s = location.search.substr(1).split("&");
+    for (var i = 0; i < s.length; i++)
+      if (s[i].toLowerCase().indexOf(name.toLowerCase() + "=") === 0)
+        return s[i].substr(name.length + 1);
+  };
+
+  // Track click events.
+  window.goatcounter.bind_events = function () {
+    if (!document.querySelectorAll)
+      // Just in case someone uses an ancient browser.
+      return;
+
+    var send = function (elem) {
+      return function () {
+        goatcounter.count({
+          event: true,
+          path: elem.dataset.goatcounterClick || elem.name || elem.id || "",
+          title:
+            elem.dataset.goatcounterTitle ||
+            elem.title ||
+            (elem.innerHTML || "").substr(0, 200) ||
+            "",
+          referrer:
+            elem.dataset.goatcounterReferrer ||
+            elem.dataset.goatcounterReferral ||
+            "",
+        });
+      };
+    };
+
+    Array.prototype.slice
+      .call(document.querySelectorAll("*[data-goatcounter-click]"))
+      .forEach(function (elem) {
+        if (elem.dataset.goatcounterBound) return;
+        var f = send(elem);
+        elem.addEventListener("click", f, false);
+        elem.addEventListener("auxclick", f, false); // Middle click.
+        elem.dataset.goatcounterBound = "true";
+      });
+  };
+
+  // Add a "visitor counter" frame or image.
+  window.goatcounter.visit_count = function (opt) {
+    on_load(function () {
+      opt = opt || {};
+      opt.type = opt.type || "html";
+      opt.append = opt.append || "body";
+      opt.path = opt.path || get_path();
+      opt.attr = opt.attr || {
+        width: "200",
+        height: opt.no_branding ? "60" : "80",
+      };
+
+      opt.attr["src"] =
+        get_endpoint() + "er/" + enc(opt.path) + "." + enc(opt.type) + "?";
+      if (opt.no_branding) opt.attr["src"] += "&no_branding=1";
+      if (opt.style) opt.attr["src"] += "&style=" + enc(opt.style);
+      if (opt.start) opt.attr["src"] += "&start=" + enc(opt.start);
+      if (opt.end) opt.attr["src"] += "&end=" + enc(opt.end);
+
+      var tag = { png: "img", svg: "img", html: "iframe" }[opt.type];
+      if (!tag) return warn("visit_count: unknown type: " + opt.type);
+
+      if (opt.type === "html") {
+        opt.attr["frameborder"] = "0";
+        opt.attr["scrolling"] = "no";
+      }
+
+      var d = document.createElement(tag);
+      for (var k in opt.attr) d.setAttribute(k, opt.attr[k]);
+
+      var p = document.querySelector(opt.append);
+      if (!p) return warn("visit_count: append not found: " + opt.append);
+      p.appendChild(d);
+    });
+  };
+
+  // Make it easy to skip your own views.
+  if (location.hash === "#toggle-goatcounter") {
+    if (localStorage.getItem("skipgc") === "t") {
+      localStorage.removeItem("skipgc", "t");
+      alert("GoatCounter tracking is now ENABLED in this browser.");
+    } else {
+      localStorage.setItem("skipgc", "t");
+      alert(
+        "GoatCounter tracking is now DISABLED in this browser until " +
+          location +
+          " is loaded again.",
+      );
+    }
+  }
+
+  if (!goatcounter.no_onload)
+    on_load(function () {
+      // 1. Page is visible, count request.
+      // 2. Page is not yet visible; wait until it switches to 'visible' and count.
+      // See #487
+      if (
+        !("visibilityState" in document) ||
+        document.visibilityState === "visible"
+      )
+        goatcounter.count();
+      else {
+        var f = function (e) {
+          if (document.visibilityState !== "visible") return;
+          document.removeEventListener("visibilitychange", f);
+          goatcounter.count();
+        };
+        document.addEventListener("visibilitychange", f);
+      }
+
+      if (!goatcounter.no_events) goatcounter.bind_events();
+    });
+})();