From 13c67dbc49a2a68220e56c0462acfe6ee8ab733d Mon Sep 17 00:00:00 2001
From: iBug <git@ibugone.com>
Date: Sun, 5 May 2024 19:43:24 +0800
Subject: [PATCH] Add "copy to clipboard" button for code blocks (#2812)

* Add copy-to-clipboard button and JS

* Ignore line numbers if present

* Rewrite heading permalink code to use vanilla JS

* README: Add credits to zenorocha/clipboard.js (MIT License)

@iBug really wants a place here in the Credits section :P

* Add .no-copy for hiding the button, update docs

* Add td.rouge-code to selectors

* Fix navigator.clipboard branch

* Add screenreader text for copy button

* Restore focus to the button after copying

* Add site-wide enable switch
---
 README.md                              |   5 +
 _config.yml                            |   1 +
 _includes/head.html                    |   5 +-
 _sass/minimal-mistakes/_utilities.scss |  57 +++++++++++
 assets/js/_main.js                     | 130 ++++++++++++++++++++-----
 assets/js/main.min.js                  |   2 +-
 docs/_config.yml                       |   1 +
 docs/_docs/05-configuration.md         |  24 +++++
 8 files changed, 199 insertions(+), 26 deletions(-)

diff --git a/README.md b/README.md
index 15a847715862..ed97b2927c75 100644
--- a/README.md
+++ b/README.md
@@ -204,6 +204,7 @@ To test the theme, run `bundle exec rake preview` and open your browser at `http
 - [Gumshoe](https://github.com/cferdinandi/gumshoe)
 - [jQuery throttle / debounce](http://benalman.com/projects/jquery-throttle-debounce-plugin/)
 - [Lunr](http://lunrjs.com)
+- [Clipboard.js](https://clipboardjs.com)
 
 ## License
 
@@ -282,3 +283,7 @@ Pure Liquid Jekyll Table of Contents is distributed under the terms of the [MIT
 Minimal Mistakes incorporates [Lunr](http://lunrjs.com),
 Copyright (c) 2018 Oliver Nightingale.
 Lunr is distributed under the terms of the [MIT License](http://opensource.org/licenses/MIT).
+
+Minimal Mistakes incorporates [clipboard.js](https://clipboardjs.com/),
+Copyright (c) 2021 Zeno Rocha.
+Clipboard.js is distributed under the terms of the [MIT License](https://opensource.org/licenses/MIT).
diff --git a/_config.yml b/_config.yml
index d8cd6ae5deed..529f362c9530 100644
--- a/_config.yml
+++ b/_config.yml
@@ -29,6 +29,7 @@ logo                     : # path of logo image to display in the masthead, e.g.
 masthead_title           : # overrides the website title displayed in the masthead, use " " for no title
 breadcrumbs              : true # true, false (default)
 words_per_minute         : 200
+enable_copy_code_button  : # true, false (default)
 copyright                : # "copyright" name, defaults to site.title
 copyright_url            : # "copyright" URL, defaults to site.url
 comments:
diff --git a/_includes/head.html b/_includes/head.html
index 87bc5e5b123a..45ad0f1a7cb2 100644
--- a/_includes/head.html
+++ b/_includes/head.html
@@ -9,8 +9,11 @@
 {%- comment %} https://docs.google.com/presentation/d/1rmxwWa9P6_xHqonmh5ONXRS-jPc5XKbnv99Rjkhe04s/present {% endcomment -%}
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
-<script>
+<script type="text/javascript">
   document.documentElement.className = document.documentElement.className.replace(/\bno-js\b/g, '') + ' js ';
+  {% if site.enable_copy_code_button -%}
+    window.enable_copy_code_button = true;
+  {%- endif %}
 </script>
 
 <!-- For all browsers -->
diff --git a/_sass/minimal-mistakes/_utilities.scss b/_sass/minimal-mistakes/_utilities.scss
index 1c127d3664f5..1b9cd76e0ebb 100644
--- a/_sass/minimal-mistakes/_utilities.scss
+++ b/_sass/minimal-mistakes/_utilities.scss
@@ -591,3 +591,60 @@ a.reversefootnote {
     position: static;
   }
 }
+
+/*
+   Copy <pre> block to clipboard
+   ========================================================================== */
+
+// a <textarea> to hold text for document.execCommand("copy")
+.clipboard-helper {
+  // Prevent zooming on iOS
+  font-size: 12pt !important;
+  border: 0 !important;
+  padding: 0 !important;
+  margin: 0 !important;
+  outline: none !important;
+  position: absolute;
+}
+
+pre {
+  .clipboard-copy-button {
+    display: block;
+    position: absolute;
+    top: 0.6em;
+    right: 0.5em;
+    z-index: 1;
+    background: none;
+    border: none;
+    outline: none;
+    border-radius: 0.1em;
+    padding: 0.2em 0.5em;
+    color: white;
+    opacity: 0.4;
+    transition: color 0.25s linear -0.25s, opacity 0.25s linear;
+
+    &:hover {
+      color: #ffffca;
+    }
+
+    &::before {
+      content: '';
+      position: absolute;
+      top: 0;
+      right: 0;
+      bottom: 0;
+      left: 0;
+      z-index: 2;
+    }
+
+    @at-root {
+      .no-copy & {
+        display: none;
+      }
+    }
+  }
+
+  &:hover .clipboard-copy-button {
+    opacity: 1;
+  }
+}
diff --git a/assets/js/_main.js b/assets/js/_main.js
index 07684993000e..c585e3daefc6 100644
--- a/assets/js/_main.js
+++ b/assets/js/_main.js
@@ -2,18 +2,18 @@
    jQuery plugin settings and other scripts
    ========================================================================== */
 
-$(function() {
+$(document).ready(function () {
   // FitVids init
   $("#main").fitVids();
 
   // Follow menu drop down
-  $(".author__urls-wrapper").find("button").on("click", function() {
+  $(".author__urls-wrapper button").on("click", function () {
     $(".author__urls").toggleClass("is--visible");
     $(".author__urls-wrapper").find("button").toggleClass("open");
   });
 
   // Close search screen with Esc key
-  $(document).keyup(function(e) {
+  $(document).keyup(function (e) {
     if (e.keyCode === 27) {
       if ($(".initial-content").hasClass("is--hidden")) {
         $(".search-content").toggleClass("is--visible");
@@ -23,12 +23,12 @@ $(function() {
   });
 
   // Search toggle
-  $(".search__toggle").on("click", function() {
+  $(".search__toggle").on("click", function () {
     $(".search-content").toggleClass("is--visible");
     $(".initial-content").toggleClass("is--hidden");
     // set focus on input
-    setTimeout(function() {
-      $(".search-content").find("input").focus();
+    setTimeout(function () {
+      $(".search-content input").focus();
     }, 400);
   });
 
@@ -37,11 +37,11 @@ $(function() {
     offset: 20,
     speed: 400,
     speedAsDuration: true,
-    durationMax: 500
+    durationMax: 500,
   });
 
   // Gumshoe scroll spy init
-  if($("nav.toc").length > 0) {
+  if ($("nav.toc").length > 0) {
     var spy = new Gumshoe("nav.toc a", {
       // Active classes
       navClass: "active", // applied to the nav list item
@@ -56,7 +56,7 @@ $(function() {
       reflow: true, // if true, listen for reflows
 
       // Event support
-      events: true // if true, emit custom events
+      events: true, // if true, emit custom events
     });
   }
 
@@ -95,38 +95,120 @@ $(function() {
     gallery: {
       enabled: true,
       navigateByImgClick: true,
-      preload: [0, 1] // Will preload 0 - before current, and 1 after the current image
+      preload: [0, 1], // Will preload 0 - before current, and 1 after the current image
     },
     image: {
-      tError: '<a href="%url%">Image #%curr%</a> could not be loaded.'
+      tError: '<a href="%url%">Image #%curr%</a> could not be loaded.',
     },
     removalDelay: 500, // Delay in milliseconds before popup is removed
     // Class that is added to body when popup is open.
     // make it unique to apply your CSS animations just to this exact popup
     mainClass: "mfp-zoom-in",
     callbacks: {
-      beforeOpen: function() {
+      beforeOpen: function () {
         // just a hack that adds mfp-anim class to markup
         this.st.image.markup = this.st.image.markup.replace(
           "mfp-figure",
           "mfp-figure mfp-with-anim"
         );
-      }
+      },
     },
     closeOnContentClick: true,
-    midClick: true // allow opening popup on middle mouse click. Always set it to true if you don't provide alternative source.
+    midClick: true, // allow opening popup on middle mouse click. Always set it to true if you don't provide alternative source.
   });
 
   // Add anchors for headings
-  $('.page__content').find('h1, h2, h3, h4, h5, h6').each(function() {
-    var id = $(this).attr('id');
-    if (id) {
-      var anchor = document.createElement("a");
-      anchor.className = 'header-link';
-      anchor.href = '#' + id;
-      anchor.innerHTML = '<span class=\"sr-only\">Permalink</span><i class=\"fas fa-link\"></i>';
-      anchor.title = "Permalink";
-      $(this).append(anchor);
+  document
+    .querySelector(".page__content")
+    .querySelectorAll("h1, h2, h3, h4, h5, h6")
+    .forEach(function (element) {
+      var id = element.getAttribute("id");
+      if (id) {
+        var anchor = document.createElement("a");
+        anchor.className = "header-link";
+        anchor.href = "#" + id;
+        anchor.innerHTML =
+          '<span class="sr-only">Permalink</span><i class="fas fa-link"></i>';
+        anchor.title = "Permalink";
+        element.appendChild(anchor);
+      }
+    });
+
+  // Add copy button for <pre> blocks
+  var copyText = function (text) {
+    if (document.queryCommandEnabled("copy") && navigator.clipboard) {
+      navigator.clipboard.writeText(text).then(
+        () => true,
+        () => console.error("Failed to copy text to clipboard: " + text)
+      );
+      return true;
+    } else {
+      var isRTL = document.documentElement.getAttribute("dir") === "rtl";
+
+      var textarea = document.createElement("textarea");
+      textarea.className = "clipboard-helper";
+      textarea.style[isRTL ? "right" : "left"] = "-9999px";
+      // Move element to the same position vertically
+      var yPosition = window.pageYOffset || document.documentElement.scrollTop;
+      textarea.style.top = yPosition + "px";
+
+      textarea.setAttribute("readonly", "");
+      textarea.value = text;
+      document.body.appendChild(textarea);
+
+      var success = true;
+      try {
+        textarea.select();
+        success = document.execCommand("copy");
+      } catch (e) {
+        success = false;
+      }
+      textarea.parentNode.removeChild(textarea);
+      return success;
     }
-  });
+  };
+
+  var copyButtonEventListener = function (event) {
+    var thisButton = event.target;
+
+    // Locate the <code> element
+    var codeBlock = thisButton.nextElementSibling;
+    while (codeBlock && codeBlock.tagName.toLowerCase() !== "code") {
+      codeBlock = codeBlock.nextElementSibling;
+    }
+    if (!codeBlock) {
+      // No <code> found - wtf?
+      console.warn(thisButton);
+      throw new Error("No code block found for this button.");
+    }
+
+    // Skip line numbers if present (i.e. {% highlight lineno %})
+    var realCodeBlock = codeBlock.querySelector("td.code, td.rouge-code");
+    if (realCodeBlock) {
+      codeBlock = realCodeBlock;
+    }
+    var result = copyText(codeBlock.innerText);
+    // Restore the focus to the button
+    thisButton.focus();
+    return result;
+  };
+
+  if (window.enable_copy_code_button) {
+    document
+      .querySelectorAll(".page__content pre > code")
+      .forEach(function (element, index, parentList) {
+        // Locate the <pre> element
+        var container = element.parentElement;
+        // Sanity check - don't add an extra button if there's already one
+        if (container.firstElementChild.tagName.toLowerCase() !== "code") {
+          return;
+        }
+        var copyButton = document.createElement("button");
+        copyButton.title = "Copy to clipboard";
+        copyButton.className = "clipboard-copy-button";
+        copyButton.innerHTML = '<span class="sr-only">Copy code</span><i class="far fa-copy"></i>';
+        copyButton.addEventListener("click", copyButtonEventListener);
+        container.prepend(copyButton);
+      });
+  }
 });
diff --git a/assets/js/main.min.js b/assets/js/main.min.js
index 69f413fe2b73..8d77e59f74dc 100644
--- a/assets/js/main.min.js
+++ b/assets/js/main.min.js
@@ -4,4 +4,4 @@
  * Free for personal and commercial use under the MIT license
  * https://github.com/mmistakes/minimal-mistakes/blob/master/LICENSE
  */
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diff --git a/docs/_config.yml b/docs/_config.yml
index 4adb512f5e86..a8f2d2742063 100644
--- a/docs/_config.yml
+++ b/docs/_config.yml
@@ -24,6 +24,7 @@ logo                     : # path of logo image to display in the masthead, e.g.
 masthead_title           : # overrides the website title displayed in the masthead, use " " for no title
 # breadcrumbs            : false # true, false (default)
 words_per_minute         : 200
+enable_copy_code_button  : true
 comments:
   provider               : "disqus" # false (default), "disqus", "discourse", "facebook", "staticman_v2", "staticman", "utterances", "giscus", "custom"
   disqus:
diff --git a/docs/_docs/05-configuration.md b/docs/_docs/05-configuration.md
index 46da6a875f1f..d83e491bab7a 100644
--- a/docs/_docs/05-configuration.md
+++ b/docs/_docs/05-configuration.md
@@ -296,6 +296,30 @@ For example,
 }
 ```
 
+### Code block copy button
+
+To enable a copy button on code blocks, add the following to `_config.yml`:
+
+```yaml
+enable_copy_code_button: true
+```
+
+When enabled site-wide, the button can be disabled on individual code blocks by adding `no-copy` to the code block's class list.
+
+````markdown
+```
+Hey, I have a "copy to clipboard" button!
+```
+````
+
+````markdown
+```
+But I don't have one.
+```
+{: .no-copy}
+````
+{: .no-copy}
+
 ### Comments
 
 [**Disqus**](https://disqus.com/), [**Discourse**](https://www.discourse.org/), [**Facebook**](https://developers.facebook.com/docs/plugins/comments), [**utterances**](https://utteranc.es/), [**giscus**](https://giscus.app/) and static-based commenting via [**Staticman**](https://staticman.net/) are built into the theme. First set the comment provider you'd like to use: