Add code copy button to all code fields in the blog (#81)

10 files changed, 110 insertions, 6 deletions

diff --git a/README.md b/README.md
index e1cf944..ba6c3d2 100755
--- a/README.md
+++ b/README.md
@@ -13,6 +13,7 @@ Hermit is a minimal and fast theme for Hugo. It's built for bloggers who want a
 * Featured image is supported. It will be displayed as a dimmed background of the page.
 * Displays all of your posts on a single page, with one section per year, simple and compact.
 * Extremely lightweight and load fast. No third party framework, no unnecessary code.
+* All code fields feature syntax highlighting and a code-copy function
 * Responsive & Retina Ready. Scales gracefully from a big screen all the way down to the smallest mobile phone. Assets in vector format ensures that it looks sharp on high-resolution screens.
 
 **[Theme Demo](https://hugo-theme-hermit.netlify.com/)** (uses contents and config from the `exampleSite` folder)
@@ -111,5 +112,6 @@ You can inject any html code to every page's document head or right above the cl
 * [normalize.css](https://necolas.github.io/normalize.css/) - [MIT](https://github.com/necolas/normalize.css/blob/master/LICENSE.md)
 * [animate.css](https://daneden.github.io/animate.css/) - [MIT](https://github.com/daneden/animate.css/blob/master/LICENSE)
 * [feather](https://feathericons.com/) - [MIT](https://github.com/feathericons/feather/blob/master/LICENSE)
+* [code-copy.js](assets/js/code-copy.js) - [Tom Spencer](https://www.fiznool.com/blog/2018/09/14/adding-click-to-copy-buttons-to-a-hugo-powered-blog/)
 
 Thanks!
diff --git a/assets/js/code-copy.js b/assets/js/code-copy.js
new file mode 100644
index 0000000..68036c8
--- /dev/null
+++ b/assets/js/code-copy.js
@@ -0,0 +1,56 @@
+/**
+ * Utils
+ */
+
+// Add code-copy buttons using progressive enhancement
+// © 2019. Tom Spencer
+// https://www.fiznool.com/blog/2018/09/14/adding-click-to-copy-buttons-to-a-hugo-powered-blog/
+(function() {
+  'use strict';
+
+  if(!document.queryCommandSupported('copy')) {
+    return;
+  }
+
+  function flashCopyMessage(el, msg) {
+    el.textContent = msg;
+    setTimeout(function() {
+      el.textContent = "Copy";
+    }, 1000);
+  }
+
+  function selectText(node) {
+    var selection = window.getSelection();
+    var range = document.createRange();
+    range.selectNodeContents(node);
+    selection.removeAllRanges();
+    selection.addRange(range);
+    return selection;
+  }
+
+  function addCopyButton(containerEl) {
+    var copyBtn = document.createElement("button");
+    copyBtn.className = "highlight-copy-btn";
+    copyBtn.textContent = "Copy";
+
+    var codeEl = containerEl.firstElementChild;
+    copyBtn.addEventListener('click', function() {
+      try {
+        var selection = selectText(codeEl);
+        document.execCommand('copy');
+        selection.removeAllRanges();
+
+        flashCopyMessage(copyBtn, 'Copied!')
+      } catch(e) {
+        console && console.log(e);
+        flashCopyMessage(copyBtn, 'Failed :\'(')
+      }
+    });
+
+    containerEl.appendChild(copyBtn);
+  }
+
+  // Add copy button to code blocks
+  var highlightBlocks = document.getElementsByClassName('highlight');
+  Array.prototype.forEach.call(highlightBlocks, addCopyButton);
+})();
diff --git a/assets/scss/style.scss b/assets/scss/style.scss
index 4476504..51143d4 100644
--- a/assets/scss/style.scss
+++ b/assets/scss/style.scss
@@ -153,6 +153,37 @@ table {
   display: none;
 }
 
+// Code copy buttons
+//
+
+.highlight {
+    position: relative;
+}
+
+.highlight pre {
+    padding-right: 75px;
+}
+
+.highlight-copy-btn {
+    position: absolute;
+    bottom: 7px;
+    right: 7px;
+    border: 0;
+    border-radius: 4px;
+    padding: 1px;
+    font-size: 0.7em;
+    line-height: 1.8;
+    color: #fff;
+    background-color: #777;
+    opacity: 0.6;
+    min-width: 55px;
+    text-align: center;
+}
+
+.highlight-copy-btn:hover {
+    background-color: #666;
+}
+
 // Accessibility
 //
 .screen-reader-text {
diff --git a/exampleSite/config.toml b/exampleSite/config.toml
index 3c94862..4e60475 100644
--- a/exampleSite/config.toml
+++ b/exampleSite/config.toml
@@ -48,6 +48,8 @@ enableEmoji = true  # Shorthand emojis in content files - https://gohugo.io/func
 
   relatedPosts = false  # Add a related content section to all single posts page
 
+  code_copy_button = true # Turn on/off the code-copy-button for code-fields
+  
   # Add custom css
   # customCSS = ["css/foo.css", "css/bar.css"]
 
diff --git a/layouts/_default/baseof.html b/layouts/_default/baseof.html
index cdb9a1f..6d312b6 100644
--- a/layouts/_default/baseof.html
+++ b/layouts/_default/baseof.html
@@ -30,8 +30,17 @@
 	{{ block "header" . -}}{{ end -}}
 	{{ block "main" . -}}{{ end -}}
 	{{ block "footer" . -}}{{ end }}
-	{{ $script := resources.Get "js/main.js" | minify | fingerprint -}}
-	<script src="{{ $script.Permalink }}" {{ printf "integrity=%q" $script.Data.Integrity | safeHTMLAttr }} crossorigin="anonymous"></script>
+
+	{{ $main := resources.Get "js/main.js" -}}
+	{{ if .Site.Params.code_copy_button | default true -}}
+		{{ $codeCopy := resources.Get "js/code-copy.js" -}}
+		{{ $script := slice $main $codeCopy | resources.Concat "js/bundle.js" | minify | fingerprint -}}
+		<script src="{{ $script.Permalink }}" {{ printf "integrity=%q" $script.Data.Integrity | safeHTMLAttr }} crossorigin="anonymous"></script>
+	{{ else -}}
+		{{ $script := $main | minify | fingerprint -}}
+		<script src="{{ $script.Permalink }}" {{ printf "integrity=%q" $script.Data.Integrity | safeHTMLAttr }} crossorigin="anonymous"></script>
+	{{ end }}
+
 	{{- partial "analytics.html" . }}
 	{{- if templates.Exists "partials/extra-foot.html" -}}
 	{{ partial "extra-foot.html" . }}
diff --git a/resources/_gen/assets/js/js/main.js_d11fe7b62c27961c87ecd0f2490357b9.content b/resources/_gen/assets/js/js/bundle.js_d11fe7b62c27961c87ecd0f2490357b9.content
index cd989df..7137f68 100644
--- a/resources/_gen/assets/js/js/main.js_d11fe7b62c27961c87ecd0f2490357b9.content
+++ b/resources/_gen/assets/js/js/bundle.js_d11fe7b62c27961c87ecd0f2490357b9.content
@@ -6,4 +6,8 @@ mobileMenuVisible=false;}}
 const showImg=()=>{document.querySelector('.bg-img').classList.add('show-bg-img');}
 const hideImg=()=>{document.querySelector('.bg-img').classList.remove('show-bg-img');}
 const toggleToc=()=>{document.getElementById('toc').classList.toggle('show-toc');}
-if(header!==null){listen('#menu-btn',"click",toggleMobileMenu);listen('#toc-btn',"click",toggleToc);listen('#img-btn',"click",showImg);listen('.bg-img',"click",hideImg);document.querySelectorAll('.post-year').forEach((ele)=>{ele.addEventListener('click',()=>{window.location.hash='#'+ele.id;});});window.addEventListener('scroll',throttle(()=>{autoHideHeader();if(mobileMenuVisible==true){toggleMobileMenu();}},250));}
\ No newline at end of file
+if(header!==null){listen('#menu-btn',"click",toggleMobileMenu);listen('#toc-btn',"click",toggleToc);listen('#img-btn',"click",showImg);listen('.bg-img',"click",hideImg);document.querySelectorAll('.post-year').forEach((ele)=>{ele.addEventListener('click',()=>{window.location.hash='#'+ele.id;});});window.addEventListener('scroll',throttle(()=>{autoHideHeader();if(mobileMenuVisible==true){toggleMobileMenu();}},250));};(function(){'use strict';if(!document.queryCommandSupported('copy')){return;}
+function flashCopyMessage(el,msg){el.textContent=msg;setTimeout(function(){el.textContent="Copy";},1000);}
+function selectText(node){var selection=window.getSelection();var range=document.createRange();range.selectNodeContents(node);selection.removeAllRanges();selection.addRange(range);return selection;}
+function addCopyButton(containerEl){var copyBtn=document.createElement("button");copyBtn.className="highlight-copy-btn";copyBtn.textContent="Copy";var codeEl=containerEl.firstElementChild;copyBtn.addEventListener('click',function(){try{var selection=selectText(codeEl);document.execCommand('copy');selection.removeAllRanges();flashCopyMessage(copyBtn,'Copied!')}catch(e){console&&console.log(e);flashCopyMessage(copyBtn,'Failed :\'(')}});containerEl.appendChild(copyBtn);}
+var highlightBlocks=document.getElementsByClassName('highlight');Array.prototype.forEach.call(highlightBlocks,addCopyButton);})();
\ No newline at end of file
diff --git a/resources/_gen/assets/js/js/bundle.js_d11fe7b62c27961c87ecd0f2490357b9.json b/resources/_gen/assets/js/js/bundle.js_d11fe7b62c27961c87ecd0f2490357b9.json
new file mode 100755
index 0000000..523e6ac
--- /dev/null
+++ b/resources/_gen/assets/js/js/bundle.js_d11fe7b62c27961c87ecd0f2490357b9.json
@@ -0,0 +1 @@
+{"Target":"js/bundle.min.4a9a0ac3d2217822c7865b4161e6c2a71de1d70492264337755427898dd718f6.js","MediaType":"application/javascript","Data":{"Integrity":"sha256-SpoKw9IheCLHhltBYebCpx3h1wSSJkM3dVQniY3XGPY="}}
\ No newline at end of file
diff --git a/resources/_gen/assets/js/js/main.js_d11fe7b62c27961c87ecd0f2490357b9.json b/resources/_gen/assets/js/js/main.js_d11fe7b62c27961c87ecd0f2490357b9.json
deleted file mode 100644
index ece2781..0000000
--- a/resources/_gen/assets/js/js/main.js_d11fe7b62c27961c87ecd0f2490357b9.json
+++ /dev/null
@@ -1 +0,0 @@
-{"Target":"js/main.min.35ccbf1cdceb91e4c64c06b5d009d6e2977fafe56beda7762febd4e67528d2ac.js","MediaType":"application/javascript","Data":{"Integrity":"sha256-Ncy/HNzrkeTGTAa10AnW4pd/r+Vr7ad2L+vU5nUo0qw="}}
\ No newline at end of file
diff --git a/resources/_gen/assets/scss/scss/style.scss_c16d144eee185fbddd582cd5e25a4fae.content b/resources/_gen/assets/scss/scss/style.scss_c16d144eee185fbddd582cd5e25a4fae.content
index 4ad7f30..475f72e 100644..100755
--- 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
 *
-* Copyright (c) 2019 Daniel Eden*/@-webkit-keyframes flash{0%,50%,to{opacity:1}25%,75%{opacity:0}}@keyframes flash{0%,50%,to{opacity:1}25%,75%{opacity:0}}.flash{-webkit-animation-name:flash;animation-name:flash}@-webkit-keyframes 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)}}@keyframes 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