add keyboard shortcut (Ctrl/Cmd + s) functionality

functions.php

@@ -100,6 +100,44 @@ function clickHandlerRebuildButton()
 <?php
 }
 
+/* THIS APPLIES TO THE SAVE/PUBLISH BUTTONS TRIGGERED BY CTRL/CMD + S */
+add_action('admin_footer', 'addKeyboardShortcut')
+
+function addKeyboardShortcut() {
+  ?>
+  <script type="text/javascript">
+    const body = document.body;
+
+    let button = '';
+    let doingClick = false;
+
+    // let JSie know on which page to seek the buttons :)
+    if(body.classList.contains('post-php')) {
+      // now we're on a page where save buttons appear, let's seek for it!
+      button = body.querySelector("input[name='save']")
+    } else if(body.classList.contains('nav-menus-php')) {
+      button = body.querySelector("input[name='save_menu']")
+    } else if(body.classList.contains('theme-editor-php' || 'plugin-editor-php')) {
+      button = body.querySelector("input[name='submit']")
+    }
+
+    if(button) {  
+      document.addEventListener('keydown', (e) => {
+        if(e.ctrlKey || e.metaKey && e.key === "s") {
+          if(doingClick) return
+          doingClick = true
+
+          // click that button!
+          button.click();
+          e.preventDefault();
+		      doingClick = false
+        }
+      })
+    }
+  </script>
+  <?php
+}
+
 // Make ACF return null instead of false when value doesn't exist so Graphql won't throw an error
 add_filter('acf/format_value', 'acf_nullify_empty', 100, 3);