Add anchor links to heading (#38)

* Closes #36 

5 files changed, 38 insertions, 4 deletions

diff --git a/assets/scss/style.scss b/assets/scss/style.scss
index 12d550c..3aa5ea4 100644
--- a/assets/scss/style.scss
+++ b/assets/scss/style.scss
@@ -22,6 +22,7 @@ html {
   background: $light-grey;
   line-height: 1.6;
   letter-spacing: .06em;
+  scroll-behavior: smooth;
 }
 
 body,
@@ -534,6 +535,39 @@ hr.post-end {
     padding: 0;
     margin-left: 1.8em;
   }
+
+  a.anchor {
+    float: left;
+    margin-left: -20px;
+    padding-right: 6px;
+    box-shadow: none;
+    opacity: .8;
+    &:hover {
+      background: none;
+      color: $theme;
+      opacity: 1;
+    }
+
+    svg {
+      display: inline-block;
+      width: 14px;
+      height: 14px;
+      vertical-align: baseline;
+      visibility: hidden;
+    }
+    &:focus svg {
+      visibility: visible;
+    }
+  }
+
+  h1:hover a.anchor svg,
+  h2:hover a.anchor svg,
+  h3:hover a.anchor svg,
+  h4:hover a.anchor svg,
+  h5:hover a.anchor svg,
+  h6:hover a.anchor svg {
+    visibility: visible;
+  }
 }
 
 .footnotes {
diff --git a/layouts/_default/single.html b/layouts/_default/single.html
index cef2cba..9ba7177 100644
--- a/layouts/_default/single.html
+++ b/layouts/_default/single.html
@@ -19,7 +19,7 @@
 	<main class="site-main section-inner thin animated fadeIn faster">
 		<h1>{{ .Title }}</h1>
 		<div class="content">
-			{{ .Content }}
+			{{ .Content | replaceRE "(<h[1-6] id=\"([^\"]+)\".+)(</h[1-6]+>)" `${1}<a href="#${2}" class="anchor" aria-hidden="true"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M15 7h3a5 5 0 0 1 5 5 5 5 0 0 1-5 5h-3m-6 0H6a5 5 0 0 1-5-5 5 5 0 0 1 5-5h3"></path><line x1="8" y1="12" x2="16" y2="12"></line></svg></a>${3}` | safeHTML }}
 		</div>
 		{{- if .Params.comments }}
 		<div id="comments" class="thin">
diff --git a/layouts/posts/single.html b/layouts/posts/single.html
index e4fc4e4..9557916 100644
--- a/layouts/posts/single.html
+++ b/layouts/posts/single.html
@@ -23,7 +23,7 @@
 				<h1>{{ .Title }}</h1>
 			</header>
 			<div class="content">
-				{{ .Content }}
+				{{ .Content | replaceRE "(<h[1-6] id=\"([^\"]+)\".+)(</h[1-6]+>)" `${1}<a href="#${2}" class="anchor" aria-hidden="true"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M15 7h3a5 5 0 0 1 5 5 5 5 0 0 1-5 5h-3m-6 0H6a5 5 0 0 1-5-5 5 5 0 0 1 5-5h3"></path><line x1="8" y1="12" x2="16" y2="12"></line></svg></a>${3}` | safeHTML }}
 			</div>
 			<hr class="post-end">
 			<footer class="post-info">
diff --git a/resources/_gen/assets/scss/scss/style.scss_c16d144eee185fbddd582cd5e25a4fae.content b/resources/_gen/assets/scss/scss/style.scss_c16d144eee185fbddd582cd5e25a4fae.content
index a1507ce..220a8f4 100644
--- a/resources/_gen/assets/scss/scss/style.scss_c16d144eee185fbddd582cd5e25a4fae.content
+++ b/resources/_gen/assets/scss/scss/style.scss_c16d144eee185fbddd582cd5e25a4fae.content
@@ -2,4 +2,4 @@
 * Version - 3.7.0
 * Licensed under the MIT license - http://opensource.org/licenses/MIT
 *
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bounceInRight{0%,60%,75%,90%,to{-webkit-animation-timing-function:cubic-bezier(0.215,0.61,0.355,1);animation-timing-function:cubic-bezier(0.215,0.61,0.355,1)}0%{opacity:0;-webkit-transform:translate3d(3000px,0,0);transform:translate3d(3000px,0,0)}60%{opacity:1;-webkit-transform:translate3d(-25px,0,0);transform:translate3d(-25px,0,0)}75%{-webkit-transform:translate3d(10px,0,0);transform:translate3d(10px,0,0)}90%{-webkit-transform:translate3d(-5px,0,0);transform:translate3d(-5px,0,0)}to{-webkit-transform:translateZ(0);transform:translateZ(0)}}.bounceInRight{-webkit-animation-name:bounceInRight;animation-name:bounceInRight}@-webkit-keyframes bounceOutRight{20%{opacity:1;-webkit-transform:translate3d(-20px,0,0);transform:translate3d(-20px,0,0)}to{opacity:0;-webkit-transform:translate3d(2000px,0,0);transform:translate3d(2000px,0,0)}}@keyframes bounceOutRight{20%{opacity:1;-webkit-transform:translate3d(-20px,0,0);transform:translate3d(-20px,0,0)}to{opacity:0;-webkit-transform:translate3d(2000px,0,0);transform:translate3d(2000px,0,0)}}.bounceOutRight{-webkit-animation-name:bounceOutRight;animation-name:bounceOutRight}@-webkit-keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.fadeIn{-webkit-animation-name:fadeIn;animation-name:fadeIn}@-webkit-keyframes slideInUp{0%{-webkit-transform:translate3d(0,100%,0);transform:translate3d(0,100%,0);visibility:visible}to{-webkit-transform:translateZ(0);transform:translateZ(0)}}@keyframes slideInUp{0%{-webkit-transform:translate3d(0,100%,0);transform:translate3d(0,100%,0);visibility:visible}to{-webkit-transform:translateZ(0);transform:translateZ(0)}}.slideInUp{-webkit-animation-name:slideInUp;animation-name:slideInUp}@-webkit-keyframes 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\ No newline at end of file
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index 810a66d..49e142d 100644
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