Add copy code button (#963)

* Add copy code button

* External package not needed

* Improve alignement

* Update button style + add feedback on click

Signed-off-by: hossainemruz <hossainemruz@gmail.com>

* Update dependencies

Signed-off-by: hossainemruz <hossainemruz@gmail.com>

---------

Signed-off-by: hossainemruz <hossainemruz@gmail.com>
Co-authored-by: Emruz Hossain <hossainemruz@gmail.com>

assets/scripts/features/copyCode/copyCode.js

@@ -0,0 +1,22 @@
+addCopyButtons(navigator.clipboard)
+
+function addCopyButtons(clipboard) {
+  document.querySelectorAll('pre > code').forEach(function (codeBlock) {
+    const button = document.createElement('button')
+    button.title = "Copy"
+    button.className = 'copy-code-button btn btn-sm'
+    button.innerHTML = "<i class='fa-regular fa-copy'></i>"
+
+    button.addEventListener('click', function () {
+      clipboard.writeText(codeBlock.innerText)
+    })
+
+    const pre = codeBlock.parentNode
+    if (pre.parentNode.classList.contains('highlight')) {
+      const highlight = pre.parentNode
+      highlight.parentNode.insertBefore(button, highlight)
+    } else {
+      pre.parentNode.insertBefore(button, pre)
+    }
+  })
+}

assets/scripts/features/copyCode/index.js

@@ -0,0 +1 @@
+import './copyCode'

assets/scripts/features/index.js

@@ -29,3 +29,7 @@ if (process.env.FEATURE_MATH === '1') {
 if (process.env.FEATURE_EMBEDPDF === '1') {
   import('./embedpdf')
 }
+
+if (process.env.FEATURE_COPYCODEBUTTON === '1') {
+  import('./copyCode')
+}