deploy: 209f0a5f85

docs/cli.html

@@ -551,6 +551,68 @@
 </div>
 
 
+<script>(function () {
+    var VALID = /^[\w.-]{1,40}$/;
+    var KEYS = ['utm_source', 'utm_campaign'];
+
+    function fromUrl(name) {
+        var hash = new URLSearchParams(location.hash.replace(/^#\??/, '')).get(name);
+        var query = new URLSearchParams(location.search).get(name);
+        var value = hash != null ? hash : query;
+        return value && VALID.test(value) ? value : null;
+    }
+
+    function remember(name, value) {
+        try {
+            if (value) sessionStorage.setItem(name, value);
+            return value || sessionStorage.getItem(name);
+        } catch (e) {
+            return value;
+        }
+    }
+
+    var utm = {};
+    KEYS.forEach(function (name) {
+        var value = remember(name, fromUrl(name));
+        if (value && VALID.test(value)) utm[name] = value;
+    });
+
+    if (!utm.utm_source && !utm.utm_campaign) return;
+
+    function fill(name, value) {
+        if (!value) return;
+        document.querySelectorAll('input[name="' + name + '"]').forEach(function (input) {
+            input.value = value;
+        });
+    }
+
+    function withUtm(href) {
+        var url = new URL(href, location.href);
+        KEYS.forEach(function (name) {
+            if (utm[name]) url.searchParams.set(name, utm[name]);
+        });
+        return url.toString();
+    }
+
+    function apply() {
+        fill('SOURCE', utm.utm_source);
+        fill('CAMPAIGN', utm.utm_campaign);
+
+        if (/^\/blog(\/|$)/.test(location.pathname)) return;
+
+        document.querySelectorAll('a[href^="https://wefunder.com/"]').forEach(function (link) {
+            link.href = withUtm(link.getAttribute('href'));
+        });
+    }
+
+    if (document.readyState === 'loading') {
+        document.addEventListener('DOMContentLoaded', apply);
+    } else {
+        apply();
+    }
+})();
+</script>
+
 <script>
 // switch theme
 const sunIcon = document.querySelector('.sun');