Unify code blocks into a single component

.babelrc

@@ -0,0 +1,20 @@
+{
+  "presets": ["babel-preset-gatsby"],
+  "plugins": [
+    [
+      "babel-plugin-prismjs",
+      {
+        "languages": [
+          "css",
+          "hcl",
+          "javascript",
+          "json",
+          "jsx",
+          "ruby",
+          "shell",
+          "sql"
+        ]
+      }
+    ]
+  ]
+}

COMPONENT_GUIDE.md

@@ -178,9 +178,9 @@ A step description
 
 > Note: keep in mind that a new line is necesary after an `img` tag to ensure proper rendering of subsequent text/markdown.
 
-## Code Snippet
+## Code blocks
 
-Code Snippets are automatically formatted by three backticks. This is our preferred method to delineate code snippets, but it's worth noting that markdown will also consider any text that is indented 4 spaces (or 1 tab) to be a code block.
+Code blocks are automatically formatted by three backticks. This is our preferred method to delineate code snippets, but it's worth noting that markdown will also consider any text that is indented 4 spaces (or 1 tab) to be a code block.
 
 ### Usage
 
@@ -193,10 +193,10 @@ There are four props that can be supplied to a code snippet.
   ```
   ````
 
-- `lineNumbers`: `true` or `false`. Will show line numbers of the left side of the code, defaults to `true`.
+- `lineNumbers`: `true` or `false`. Will show line numbers of the left side of the code, defaults to `false`.
 
   ````md
-  ```jsx lineNumbers=false
+  ```jsx lineNumbers=true
   ```
   ````
 

package.json

@@ -38,12 +38,14 @@
     "react-markdown": "^4.3.1",
     "react-middle-ellipsis": "^1.1.0",
     "react-shadow": "^18.1.2",
+    "react-simple-code-editor": "^0.11.0",
     "use-dark-mode": "^2.3.1"
   },
   "devDependencies": {
     "@newrelic/eslint-plugin-newrelic": "^0.3.0",
     "@testing-library/react": "^10.0.4",
     "babel-jest": "^26.0.1",
+    "babel-plugin-prismjs": "^2.0.1",
     "babel-preset-gatsby": "^0.4.2",
     "eslint": "^6.8.0",
     "eslint-plugin-jsx-a11y": "^6.2.3",

src/components/Button.js

@@ -8,11 +8,12 @@ const Button = ({
   children,
   className,
   variant,
+  size,
   ...props
 }) => (
   <Component
     {...props}
-    className={cx(className, styles.button, styles[variant])}
+    className={cx(className, styles.button, styles[variant], styles[size])}
   >
     {children}
   </Component>
@@ -24,10 +25,15 @@ Button.VARIANT = {
   NORMAL: 'normal',
 };
 
+Button.SIZE = {
+  SMALL: 'small',
+};
+
 Button.propTypes = {
   as: PropTypes.elementType,
   children: PropTypes.node,
   className: PropTypes.string,
+  size: PropTypes.oneOf(Object.values(Button.SIZE)),
   type: PropTypes.oneOf(['button', 'submit', 'reset']),
   variant: PropTypes.oneOf(Object.values(Button.VARIANT)).isRequired,
 };

src/components/Button.module.scss

@@ -46,3 +46,7 @@
     color: var(--color-brand-400);
   }
 }
+
+.small {
+  font-size: 0.75rem;
+}

src/components/CodeBlock.js

@@ -0,0 +1,113 @@
+import React, { useState, useEffect } from 'react';
+import PropTypes from 'prop-types';
+import cx from 'classnames';
+import Button from './Button';
+import CodeEditor from './CodeEditor';
+import CodeHighlight from './CodeHighlight';
+import FeatherIcon from './FeatherIcon';
+import MiddleEllipsis from 'react-middle-ellipsis';
+import { LiveError, LivePreview, LiveProvider } from 'react-live';
+import styles from './CodeBlock.module.scss';
+import useClipboard from '../hooks/useClipboard';
+import useFormattedCode from '../hooks/useFormattedCode';
+
+const defaultComponents = {
+  Preview: LivePreview,
+};
+
+const CodeBlock = ({
+  children,
+  components: componentOverrides = {},
+  copyable,
+  live,
+  highlightedLines,
+  fileName,
+  language,
+  lineNumbers,
+  preview,
+  scope,
+  formatOptions,
+}) => {
+  const components = { ...defaultComponents, ...componentOverrides };
+  const formattedCode = useFormattedCode(children.trim(), formatOptions);
+  const [copied, copy] = useClipboard();
+  const [code, setCode] = useState(formattedCode);
+
+  useEffect(() => {
+    setCode(formattedCode);
+  }, [formattedCode]);
+
+  return (
+    <LiveProvider code={code} scope={scope}>
+      {preview && <components.Preview className={styles.preview} />}
+      <div className={cx(styles.container, { [styles.withPreview]: preview })}>
+        <div className={styles.scrollContainer}>
+          {live ? (
+            <CodeEditor
+              value={code}
+              language={language}
+              lineNumbers={lineNumbers}
+              onChange={setCode}
+            />
+          ) : (
+            <CodeHighlight
+              highlightedLines={highlightedLines}
+              language={language}
+              lineNumbers={lineNumbers}
+            >
+              {code}
+            </CodeHighlight>
+          )}
+        </div>
+
+        {(copyable || fileName) && (
+          <div className={styles.statusBar}>
+            <div className={styles.fileName}>
+              {fileName && (
+                <MiddleEllipsis>
+                  <span title={fileName}>{fileName}</span>
+                </MiddleEllipsis>
+              )}
+            </div>
+            <Button
+              type="button"
+              className={styles.copyButton}
+              variant={Button.VARIANT.PLAIN}
+              onClick={() => copy(code)}
+              size={Button.SIZE.SMALL}
+            >
+              <FeatherIcon name="copy" className={styles.copyButtonIcon} />
+              {copied ? 'Copied' : 'Copy output'}
+            </Button>
+          </div>
+        )}
+      </div>
+      {(live || preview) && <LiveError className={styles.liveError} />}
+    </LiveProvider>
+  );
+};
+
+CodeBlock.propTypes = {
+  fileName: PropTypes.string,
+  components: PropTypes.shape({
+    Preview: PropTypes.elementType,
+  }),
+  copyable: PropTypes.bool,
+  children: PropTypes.string.isRequired,
+  formatOptions: PropTypes.object,
+  highlightedLines: PropTypes.string,
+  language: PropTypes.string,
+  lineNumbers: PropTypes.bool,
+  live: PropTypes.bool,
+  preview: PropTypes.bool,
+  scope: PropTypes.object,
+};
+
+CodeBlock.defaultProps = {
+  copyable: true,
+  lineNumbers: false,
+  live: false,
+  preview: false,
+};
+
+export default CodeBlock;

src/components/CodeBlock.module.scss

@@ -0,0 +1,69 @@
+.container {
+  background: var(--color-nord-0);
+  border-radius: 4px;
+
+  :global(.light-mode) & {
+    background: var(--color-nord-6);
+  }
+
+  &.withPreview {
+    border-top-left-radius: 0;
+    border-top-right-radius: 0;
+  }
+}
+
+.scrollContainer {
+  max-height: 26em;
+  overflow: auto;
+}
+
+.statusBar {
+  color: var(--color-nord-6);
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  background: var(--color-nord-1);
+  border-bottom-left-radius: 4px;
+  border-bottom-right-radius: 4px;
+  padding: 0 1rem;
+  font-size: 0.75rem;
+
+  :global(.light-mode) & {
+    color: var(--color-nord-0);
+    background: var(--color-nord-4);
+  }
+}
+
+.fileName {
+  font-family: var(--code-font);
+  white-space: nowrap;
+  overflow: hidden;
+  padding-right: 0.5rem;
+}
+
+.copyButton {
+  white-space: nowrap;
+}
+
+.copyButtonIcon {
+  margin-right: 0.5rem;
+}
+
+.liveError {
+  color: white;
+  background: var(--color-red-400);
+  padding: 0.5rem 1rem;
+  font-size: 0.75rem;
+  overflow: auto;
+  margin-top: 0.5rem;
+  border-radius: 2px;
+}
+
+.preview {
+  padding: 2rem;
+  background: var(--color-white);
+  border: 1px solid var(--color-neutrals-100);
+  box-shadow: var(--boxshadow);
+  border-top-left-radius: 4px;
+  border-top-right-radius: 4px;
+}

src/components/CodeEditor.js

@@ -0,0 +1,43 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import cx from 'classnames';
+import Editor from 'react-simple-code-editor';
+import CodeHighlight from './CodeHighlight';
+import styles from './CodeEditor.module.scss';
+
+const CodeEditor = ({ value, language, lineNumbers, onChange }) => {
+  const lineNumberWidth = value.trim().split('\n').length.toString().length;
+
+  return (
+    <Editor
+      value={value}
+      padding={16}
+      onValueChange={onChange}
+      highlight={(code) => (
+        <CodeHighlight
+          wrap
+          className={styles.editor}
+          language={language}
+          lineNumbers={lineNumbers}
+        >
+          {code}
+        </CodeHighlight>
+      )}
+      textareaClassName={cx({ [styles.lineNumbers]: lineNumbers })}
+      style={{
+        fontFamily: 'var(--code-font)',
+        fontSize: '0.75rem',
+        '--line-number-width': `${lineNumberWidth}ch`,
+      }}
+    />
+  );
+};
+
+CodeEditor.propTypes = {
+  language: PropTypes.string.isRequired,
+  lineNumbers: PropTypes.bool,
+  onChange: PropTypes.func,
+  value: PropTypes.string.isRequired,
+};
+
+export default CodeEditor;

src/components/CodeEditor.module.scss

@@ -0,0 +1,7 @@
+.editor {
+  padding: 0 !important;
+}
+
+.lineNumbers {
+  padding-left: calc(2rem + var(--line-number-width)) !important;
+}