Update themes/mytheme/layouts/partials/head.html

themes/mytheme/layouts/partials/head.html

@@ -185,3 +185,44 @@
 {{- template "partials/templates/twitter_cards.html" . }}
 {{- template "partials/templates/schema_json.html" . }}
 {{- end -}}
+
+{{- /* theme-toggle is enabled */}}
+{{- if (not site.Params.disableThemeToggle) }}
+{{- /* theme is light */}}
+{{- if (eq site.Params.defaultTheme "light") }}
+<script>
+    if (localStorage.getItem("pref-theme") === "dark") {
+        document.body.classList.add('dark');
+    }
+
+</script>
+{{- /* theme is dark */}}
+{{- else if (eq site.Params.defaultTheme "dark") }}
+<script>
+    if (localStorage.getItem("pref-theme") === "light") {
+        document.body.classList.remove('dark')
+    }
+
+</script>
+{{- else }}
+{{- /* theme is auto */}}
+<script>
+    if (localStorage.getItem("pref-theme") === "dark") {
+        document.body.classList.add('dark');
+    } else if (localStorage.getItem("pref-theme") === "light") {
+        document.body.classList.remove('dark')
+    } else if (window.matchMedia('(prefers-color-scheme: dark)').matches) {
+        document.body.classList.add('dark');
+    }
+
+</script>
+{{- end }}
+{{- /* theme-toggle is disabled and theme is auto */}}
+{{- else if (and (ne site.Params.defaultTheme "light") (ne site.Params.defaultTheme "dark"))}}
+<script>
+    if (window.matchMedia('(prefers-color-scheme: dark)').matches) {
+        document.body.classList.add('dark');
+    }
+
+</script>
+{{- end }}