From 15d306cf147061e4ff65d7ceedee72acac007c53 Mon Sep 17 00:00:00 2001
From: FujiHaruka <fizzyjohn1427@gmail.com>
Date: Sun, 4 Aug 2019 18:03:08 +0900
Subject: [PATCH] Enable to add anchor to header elements

---
 assets/js/scripts.js                | 26 ++++++++++++++++++++++++++
 assets/scss/components/_anchor.scss | 10 ++++++++++
 assets/scss/style.scss              |  1 +
 layouts/_default/single.html        |  2 +-
 4 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 assets/scss/components/_anchor.scss

diff --git a/assets/js/scripts.js b/assets/js/scripts.js
index 19d4ec6..0c697d0 100644
--- a/assets/js/scripts.js
+++ b/assets/js/scripts.js
@@ -7,3 +7,29 @@ menuTrigger.onclick = function() {
     menuTrigger.classList.toggle('is-active')
     body.classList.toggle('lock-scroll')
 }
+
+var content = document.querySelector('.content.anchor-link-enabled')
+if (content) {
+    addHeaderAnchors(content);
+}
+
+function addHeaderAnchors(content) {
+    var headers = content.querySelectorAll('h1, h2, h3, h4');
+    // SVG data from https://iconmonstr.com/link-1-svg/
+    var linkSvg = ' <svg xmlns="http://www.w3.org/2000/svg" width="16px" height="16px" viewBox="0 0 24 24"><path d="M0 0h24v24H0z" fill="none"></path><path d="M6.188 8.719c.439-.439.926-.801 1.444-1.087 2.887-1.591 6.589-.745 8.445 2.069l-2.246 2.245c-.644-1.469-2.243-2.305-3.834-1.949-.599.134-1.168.433-1.633.898l-4.304 4.306c-1.307 1.307-1.307 3.433 0 4.74 1.307 1.307 3.433 1.307 4.74 0l1.327-1.327c1.207.479 2.501.67 3.779.575l-2.929 2.929c-2.511 2.511-6.582 2.511-9.093 0s-2.511-6.582 0-9.093l4.304-4.306zm6.836-6.836l-2.929 2.929c1.277-.096 2.572.096 3.779.574l1.326-1.326c1.307-1.307 3.433-1.307 4.74 0 1.307 1.307 1.307 3.433 0 4.74l-4.305 4.305c-1.311 1.311-3.44 1.3-4.74 0-.303-.303-.564-.68-.727-1.051l-2.246 2.245c.236.358.481.667.796.982.812.812 1.846 1.417 3.036 1.704 1.542.371 3.194.166 4.613-.617.518-.286 1.005-.648 1.444-1.087l4.304-4.305c2.512-2.511 2.512-6.582.001-9.093-2.511-2.51-6.581-2.51-9.092 0z"/></svg>';
+    var anchorForId = function (id) {
+        var anchor = document.createElement('a');
+        anchor.classList.add('header-anchor');
+        anchor.href = "#" + id;
+        anchor.innerHTML = linkSvg;
+        return anchor;
+    };
+
+    for (var h = 0; h < headers.length; h++) {
+        var header = headers[h];
+
+        if (typeof header.id !== "undefined" && header.id !== "") {
+            header.appendChild(anchorForId(header.id));
+        }
+    }
+}
diff --git a/assets/scss/components/_anchor.scss b/assets/scss/components/_anchor.scss
new file mode 100644
index 0000000..8b494e6
--- /dev/null
+++ b/assets/scss/components/_anchor.scss
@@ -0,0 +1,10 @@
+.content {
+  .header-anchor {
+    text-decoration: none;
+    fill: currentColor;
+    opacity: 0.6;
+  }
+  .header-anchor:hover {
+    opacity: 1;
+  }
+}
diff --git a/assets/scss/style.scss b/assets/scss/style.scss
index 31373c2..ee54235 100755
--- a/assets/scss/style.scss
+++ b/assets/scss/style.scss
@@ -33,6 +33,7 @@
 @import 'components/strip';
 @import 'components/whitebox';
 @import 'components/overview';
+@import 'components/anchor';
 
 // Pages
 @import 'pages/home';
diff --git a/layouts/_default/single.html b/layouts/_default/single.html
index 3c930e1..67d1129 100644
--- a/layouts/_default/single.html
+++ b/layouts/_default/single.html
@@ -4,7 +4,7 @@
 
 {{ define "main" }}
 <h1 class="title">{{.Title}}</h1>
-<div class="content">
+<div class="content {{if .Site.Params.enable_anchor_link}}{{ "anchor-link-enabled" }}{{ end }}">
   {{.Content}}
 </div>
 </div>