Copy to clipboard feature for code block (#152)

Co-authored-by: Jacky Zhao <j.zhao2k19@gmail.com>

assets/js/clipboard.js

@@ -0,0 +1,38 @@
+const svgCopy =
+    '<svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true"><path fill-rule="evenodd" d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 010 1.5h-1.5a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-1.5a.75.75 0 011.5 0v1.5A1.75 1.75 0 019.25 16h-7.5A1.75 1.75 0 010 14.25v-7.5z"></path><path fill-rule="evenodd" d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0114.25 11h-7.5A1.75 1.75 0 015 9.25v-7.5zm1.75-.25a.25.25 0 00-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 00.25-.25v-7.5a.25.25 0 00-.25-.25h-7.5z"></path></svg>';
+const svgCheck =
+    '<svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true"><path fill-rule="evenodd" fill="rgb(63, 185, 80)" d="M13.78 4.22a.75.75 0 010 1.06l-7.25 7.25a.75.75 0 01-1.06 0L2.22 9.28a.75.75 0 011.06-1.06L6 10.94l6.72-6.72a.75.75 0 011.06 0z"></path></svg>';
+
+
+const addCopyButtons = () => {
+    let els = document.getElementsByClassName("highlight");
+    // for each highlight
+    for (let i = 0; i < els.length; i++) {
+        if (els[i].getElementsByClassName("clipboard-button").length) continue;
+
+        // find pre > code inside els[i]
+        let codeBlocks = els[i].getElementsByTagName("code");
+
+         // line numbers are inside first code block
+        let lastCodeBlock = codeBlocks[codeBlocks.length - 1];
+        const button = document.createElement("button");
+        button.className = "clipboard-button";
+        button.type = "button";
+        button.innerHTML = svgCopy;
+        // remove every second newline from lastCodeBlock.innerText
+        button.addEventListener("click", () => {
+            navigator.clipboard.writeText(lastCodeBlock.innerText.replace(/\n\n/g, "\n")).then(
+                () => {
+                    button.blur();
+                    button.innerHTML = svgCheck;
+                    setTimeout(() => (button.innerHTML = svgCopy), 2000);
+                },
+                (error) => (button.innerHTML = "Error")
+            );
+        });
+        // find chroma inside els[i]
+        let chroma = els[i].getElementsByClassName("chroma")[0];
+        els[i].insertBefore(button, chroma);
+        console.log(els[i].lastChild)
+    }
+}

assets/js/darkmode.js

@@ -8,7 +8,7 @@ const syntaxTheme = document.querySelector("#theme-link");
 
 if (currentTheme) {
   document.documentElement.setAttribute('saved-theme', currentTheme);
-  (currentTheme === 'dark') ? syntaxTheme.href = '{{ $darkSyntax.Permalink }}' : syntaxTheme.href = '{{ $lightSyntax.Permalink }}';
+  syntaxTheme.href = currentTheme === 'dark' ?  '{{ $darkSyntax.Permalink }}' :  '{{ $lightSyntax.Permalink }}';
 }
 
 const switchTheme = (e) => {

assets/styles/clipboard.scss

@@ -0,0 +1,47 @@
+.clipboard-button {
+  position: absolute;
+  display: flex;
+  float: right;
+  right: 0;
+  padding: 0.69em;
+  margin: 0.5em;
+  color: var(--outlinegray);
+  border-color: var(--dark);
+  background-color: var(--lightgray);
+  filter: contrast(1.1);
+  border: 2px solid;
+  border-radius: 6px;
+  font-size: 0.8em;
+  z-index: 1;
+  opacity: 0;
+  transition: 0.12s;
+  
+  & > svg {
+    fill: var(--light);
+    filter: contrast(0.3);
+  }
+  
+  &:hover {
+    cursor: pointer;
+    border-color: var(--primary);
+    
+    & > svg {
+      fill: var(--primary);
+    }
+  }
+  
+  &:focus {
+    outline: 0;
+  }
+}
+
+.highlight {
+  position: relative;
+  
+  &:hover > .clipboard-button {
+    opacity: 1;
+    transition: 0.2s;
+  }
+}
+
+

content/notes/config.md

@@ -28,12 +28,15 @@ enableLinkPreview: true
 # whether to render titles for code blocks
 enableCodeBlockTitle: true 
 
+# whether to render copy buttons for code blocks
+enableCodeBlockCopy: true 
+
 # whether to try to process Latex
 enableLatex: true
 
 # whether to enable single-page-app style rendering
-# this prevents flahses of unstyled content and overall improves
-# smoothness of quartz. More info in issue #109 on GitHub
+# this prevents flashes of unstyled content and improves
+# smoothness of Quartz. More info in issue #109 on GitHub
 enableSPA: true
 
 # whether to render a footer
@@ -83,10 +86,10 @@ To add code block titles with Quartz:
       ```
 
 **Note** that if `{title=<my-title>}` is included, and code block titles are not
-enabled, no errors will occur and the title attribute will be ignored.
+enabled, no errors will occur, and the title attribute will be ignored.
 
 ### HTML Favicons
-If you would like to customize the favicons of your quartz-based website, you 
+If you would like to customize the favicons of your Quartz-based website, you 
 can add them to the `data/config.yaml` file. The **default** without any set 
 `favicon` key is:
 
@@ -95,7 +98,7 @@ can add them to the `data/config.yaml` file. The **default** without any set
 ```
 
 The default can be overridden by defining a value to the `favicon` key in your 
-`data/config.yaml` file. Here is a `List[Dictionary]` example format, which is
+`data/config.yaml` file. For example, here is a `List[Dictionary]` example format, which is
 equivalent to the default:
 
 ```yaml {title="data/config.yaml", linenos=false}
@@ -108,7 +111,7 @@ In this format, the keys are identical to their HTML representations.
 
 If you plan to add multiple favicons generated by a website (see list below), it
 may be easier to define it as HTML. Here is an example which appends the 
-**Apple touch icon** to quartz's default favicon:
+**Apple touch icon** to Quartz's default favicon:
 
 ```yaml {title="data/config.yaml", linenos=false}
 favicon: |
@@ -118,7 +121,7 @@ favicon: |
 
 This second favicon will now be used as a web page icon when someone adds your 
 webpage to the home screen of their Apple device. If you are interested in more 
-information about the current, and past, standards of favicons, you can read 
+information about the current and past standards of favicons, you can read 
 [this article](https://www.emergeinteractive.com/insights/detail/the-essentials-of-favicons/).
 
 **Note** that all generated favicon paths, defined by the `href` 
@@ -136,7 +139,7 @@ enableGlobalGraph: false
 
 ### Local Graph ###
 localGraph:
-	# whether automatically generate a legend
+    # whether automatically generate a legend
     enableLegend: false
     
     # whether to allow dragging nodes in the graph
@@ -181,7 +184,7 @@ paths:
 Want to go even more in-depth? You can add custom CSS styling and change existing colours through editing `assets/styles/custom.scss`. If you'd like to target specific parts of the site, you can add ids and classes to the HTML partials in `/layouts/partials`. 
 
 ### Partials
-Partials are what dictate what actually gets rendered to the page. Want to change how pages are styled and structured? You can edit the appropriate layout in `/layouts`.
+Partials are what dictate what gets rendered to the page. Want to change how pages are styled and structured? You can edit the appropriate layout in `/layouts`.
 
 For example, the structure of the home page can be edited through `/layouts/index.html`. To customize the footer, you can edit `/layouts/partials/footer.html`
 

data/config.yaml

@@ -4,6 +4,7 @@ openToc: false
 enableLinkPreview: true
 enableLatex: true
 enableCodeBlockTitle: true
+enableCodeBlockCopy: true
 enableSPA: true
 enableFooter: true
 enableContextualBacklinks: true

layouts/partials/head.html

@@ -54,6 +54,13 @@
   <script src="{{$codeTitle.Permalink}}"></script>
   {{end}}
 
+  {{ if $.Site.Data.config.enableCodeBlockCopy }}
+  {{ $clipboard := resources.Get "js/clipboard.js" | resources.Fingerprint "md5" | resources.Minify }}
+  {{ if (findRE "<pre" .Content 1) }}
+    <script src="{{$clipboard.Permalink}}"></script>
+  {{ end }}
+  {{ end }}
+
   <!--  Preload page vars  -->
   {{$linkIndex := resources.Get "indices/linkIndex.json" | resources.Fingerprint
   "md5" | resources.Minify | }} {{$contentIndex := resources.Get
@@ -85,6 +92,10 @@
       const pathWindow = window.location.pathname;
       const isHome = pathBase == pathWindow;
 
+      {{if $.Site.Data.config.enableCodeBlockCopy -}}
+      addCopyButtons();
+      {{ end }}
+
       {{if $.Site.Data.config.enableSPA -}}
       addTitleToCodeBlocks();
       {{ end }}
@@ -118,12 +129,12 @@
 
     const init = (doc = document) => {
       // NOTE: everything within this callback will be executed for initial page navigation. This is a good place to put JavaScript that only replaces DOM nodes.
+      {{if $.Site.Data.config.enableCodeBlockCopy -}}
+      addCopyButtons();
+      {{ end }}
+
       {{if $.Site.Data.config.enableCodeBlockTitle -}}
-      {{if $.Site.Data.config.enableSPA -}}
       addTitleToCodeBlocks();
-      {{ else }}
-      window.addEventListener("DOMContentLoaded", addTitleToCodeBlocks);
-      {{- end -}}
       {{- end -}}
       {{if $.Site.Data.config.enableLatex}}
       renderMathInElement(doc.body, {