[feat] Add dark mode support

6 files changed, 53 insertions, 0 deletions

diff --git a/layouts/partials/meta.html b/layouts/partials/meta.html
index aa52105..094bf03 100644
--- a/layouts/partials/meta.html
+++ b/layouts/partials/meta.html
@@ -15,6 +15,8 @@
 		<link rel="stylesheet" href="{{ . }}"/>
 		{{ end }}
 
+		<script defer src="/js/dark-mode.js"></script>
+		<link disabled id="dark-mode-theme" rel="stylesheet" href="/css/dark.css">
 		<link  rel="stylesheet" href="https://fonts.googleapis.com/css?family=Fira+Mono|Lato|Raleway">
 
 		{{ if .Site.Params.HighlightJs }}
diff --git a/layouts/partials/navbar.html b/layouts/partials/navbar.html
index c0f97fa..944b224 100644
--- a/layouts/partials/navbar.html
+++ b/layouts/partials/navbar.html
@@ -7,6 +7,7 @@
 			</a>
 		</li>
 		{{- end -}}
+		<li><img class="icon-text" id="dark-mode-toggle" src="/img/moon-regular.svg" alt="Toggle Dark Mode"></a></li>
 		{{- range .Site.Menus.main -}}
 		<li><a href="{{ .URL }}">{{ .Name | title }}</a></li>
 		{{- end -}}
diff --git a/static/css/dark.css b/static/css/dark.css
new file mode 100644
index 0000000..c5b340c
--- /dev/null
+++ b/static/css/dark.css
@@ -0,0 +1,13 @@
+html {
+    background-color: #ebebeb !important;
+}
+
+html {
+filter: invert(1) hue-rotate(.5turn);
+}
+
+img:not(.icon-text, .icon-social),
+video,
+code {
+filter: hue-rotate(180deg) contrast(100%) invert(100%);
+}
diff --git a/static/img/moon.svg b/static/img/moon.svg
new file mode 100644
index 0000000..468f431
--- /dev/null
+++ b/static/img/moon.svg
@@ -0,0 +1 @@
+<svg aria-hidden="true" focusable="false" data-prefix="far" data-icon="moon" class="svg-inline--fa fa-moon fa-w-16" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path fill="currentColor" d="M279.135 512c78.756 0 150.982-35.804 198.844-94.775 28.27-34.831-2.558-85.722-46.249-77.401-82.348 15.683-158.272-47.268-158.272-130.792 0-48.424 26.06-92.292 67.434-115.836 38.745-22.05 28.999-80.788-15.022-88.919A257.936 257.936 0 0 0 279.135 0c-141.36 0-256 114.575-256 256 0 141.36 114.576 256 256 256zm0-464c12.985 0 25.689 1.201 38.016 3.478-54.76 31.163-91.693 90.042-91.693 157.554 0 113.848 103.641 199.2 215.252 177.944C402.574 433.964 344.366 464 279.135 464c-114.875 0-208-93.125-208-208s93.125-208 208-208z"></path></svg>
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diff --git a/static/img/sun.svg b/static/img/sun.svg
new file mode 100644
index 0000000..b13a630
--- /dev/null
+++ b/static/img/sun.svg
@@ -0,0 +1 @@
+<svg aria-hidden="true" focusable="false" data-prefix="far" data-icon="sun" class="svg-inline--fa fa-sun fa-w-16" role="img" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path fill="currentColor" d="M494.2 221.9l-59.8-40.5 13.7-71c2.6-13.2-1.6-26.8-11.1-36.4-9.6-9.5-23.2-13.7-36.2-11.1l-70.9 13.7-40.4-59.9c-15.1-22.3-51.9-22.3-67 0l-40.4 59.9-70.8-13.7C98 60.4 84.5 64.5 75 74.1c-9.5 9.6-13.7 23.1-11.1 36.3l13.7 71-59.8 40.5C6.6 229.5 0 242 0 255.5s6.7 26 17.8 33.5l59.8 40.5-13.7 71c-2.6 13.2 1.6 26.8 11.1 36.3 9.5 9.5 22.9 13.7 36.3 11.1l70.8-13.7 40.4 59.9C230 505.3 242.6 512 256 512s26-6.7 33.5-17.8l40.4-59.9 70.9 13.7c13.4 2.7 26.8-1.6 36.3-11.1 9.5-9.5 13.6-23.1 11.1-36.3l-13.7-71 59.8-40.5c11.1-7.5 17.8-20.1 17.8-33.5-.1-13.6-6.7-26.1-17.9-33.7zm-112.9 85.6l17.6 91.2-91-17.6L256 458l-51.9-77-90.9 17.6 17.6-91.2-76.8-52 76.8-52-17.6-91.2 91 17.6L256 53l51.9 76.9 91-17.6-17.6 91.1 76.8 52-76.8 52.1zM256 152c-57.3 0-104 46.7-104 104s46.7 104 104 104 104-46.7 104-104-46.7-104-104-104zm0 160c-30.9 0-56-25.1-56-56s25.1-56 56-56 56 25.1 56 56-25.1 56-56 56z"></path></svg>
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diff --git a/static/js/dark-mode.js b/static/js/dark-mode.js
new file mode 100644
index 0000000..5a67798
--- /dev/null
+++ b/static/js/dark-mode.js
@@ -0,0 +1,35 @@
+var toggle = document.getElementById("dark-mode-toggle");
+var darkTheme = document.getElementById("dark-mode-theme");
+
+// probe system default dark mode setting
+var systemDefault = null
+if (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) {
+    systemDefault = "dark";
+} else {
+    systemDefault = "light";
+}
+
+// use user preference if possible
+var savedTheme = localStorage.getItem("dark-mode-storage") || systemDefault;
+setTheme(savedTheme);
+
+toggle.addEventListener("click", () => {
+    if (toggle.src.endsWith("/img/moon.svg") ) {
+        setTheme("dark");
+    } else if (toggle.src.endsWith("/img/sun.svg") ) {
+        setTheme("light");
+    }
+
+});
+
+function setTheme(mode) {
+    localStorage.setItem("dark-mode-storage", mode);
+
+    if (mode === "dark") {
+        darkTheme.disabled = false;
+        toggle.src = "/img/sun.svg";
+    } else if (mode === "light") {
+        darkTheme.disabled = true;
+        toggle.src = "/img/moon.svg";
+    }
+}
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