Reorganized codepen folder further to support nesting

.eslintignore

@@ -7,4 +7,4 @@ content/*
 public/*
 
 # Ignore examples
-examples/*
+codepen/*

codepen/components-and-props/composing-components.js

@@ -0,0 +1,18 @@
+function Welcome(props) {
+  return <h1>Hello, {props.name}</h1>;
+}
+
+function App() {
+  return (
+    <div>
+      <Welcome name="Sara" />
+      <Welcome name="Cahal" />
+      <Welcome name="Edite" />
+    </div>
+  );
+}
+
+ReactDOM.render(
+  <App />,
+  document.getElementById('root')
+);

codepen/components-and-props/extracting-components-continued.js

@@ -0,0 +1,52 @@
+function formatDate(date) {
+  return date.toLocaleDateString();
+}
+
+function Avatar(props) {
+  return (
+    <img className="Avatar"
+         src={props.user.avatarUrl}
+         alt={props.user.name} />
+  );
+}
+
+function UserInfo(props) {
+  return (
+    <div className="UserInfo">
+      <Avatar user={props.user} />
+      <div className="UserInfo-name">
+        {props.user.name}
+      </div>
+    </div>
+  );
+}
+
+function Comment(props) {
+  return (
+    <div className="Comment">
+      <UserInfo user={props.author} />
+      <div className="Comment-text">
+        {props.text}
+      </div>
+      <div className="Comment-date">
+        {formatDate(props.date)}
+      </div>
+    </div>
+  );
+}
+
+const comment = {
+  date: new Date(),
+  text: 'I hope you enjoy learning React!',
+  author: {
+    name: 'Hello Kitty',
+    avatarUrl: 'http://placekitten.com/g/64/64'
+  }
+};
+ReactDOM.render(
+  <Comment
+    date={comment.date}
+    text={comment.text}
+    author={comment.author} />,
+  document.getElementById('root')
+);

codepen/components-and-props/extracting-components.js

@@ -0,0 +1,40 @@
+function formatDate(date) {
+  return date.toLocaleDateString();
+}
+
+function Comment(props) {
+  return (
+    <div className="Comment">
+      <div className="UserInfo">
+        <img className="Avatar"
+             src={props.author.avatarUrl}
+             alt={props.author.name} />
+        <div className="UserInfo-name">
+          {props.author.name}
+        </div>
+      </div>
+      <div className="Comment-text">
+        {props.text}
+      </div>
+      <div className="Comment-date">
+        {formatDate(props.date)}
+      </div>
+    </div>
+  );
+}
+
+const comment = {
+  date: new Date(),
+  text: 'I hope you enjoy learning React!',
+  author: {
+    name: 'Hello Kitty',
+    avatarUrl: 'http://placekitten.com/g/64/64'
+  }
+};
+ReactDOM.render(
+  <Comment
+    date={comment.date}
+    text={comment.text}
+    author={comment.author} />,
+  document.getElementById('root')
+);

codepen/components-and-props/rendering-a-component.js

@@ -0,0 +1,9 @@
+function Welcome(props) {
+  return <h1>Hello, {props.name}</h1>;
+}
+
+const element = <Welcome name="Sara" />;
+ReactDOM.render(
+  element,
+  document.getElementById('root')
+);

content/docs/components-and-props.md

@@ -76,7 +76,7 @@ ReactDOM.render(
 );
 ```
 
-[Try it on CodePen.](http://codepen.io/gaearon/pen/YGYmEG?editors=0010)
+<a href="/codepen/components-and-props/rendering-a-component" target="_blank">Try it on CodePen</a>.
 
 Let's recap what happens in this example:
 
@@ -118,7 +118,7 @@ ReactDOM.render(
 );
 ```
 
-[Try it on CodePen.](http://codepen.io/gaearon/pen/KgQKPr?editors=0010)
+<a href="/codepen/components-and-props/composing-components" target="_blank">Try it on CodePen</a>.
 
 Typically, new React apps have a single `App` component at the very top. However, if you integrate React into an existing app, you might start bottom-up with a small component like `Button` and gradually work your way to the top of the view hierarchy.
 
@@ -152,7 +152,7 @@ function Comment(props) {
 }
 ```
 
-[Try it on CodePen.](http://codepen.io/gaearon/pen/VKQwEo?editors=0010)
+<a href="/codepen/components-and-props/extracting-components" target="_blank">Try it on CodePen</a>.
 
 It accepts `author` (an object), `text` (a string), and `date` (a date) as props, and describes a comment on a social media website.
 
@@ -231,7 +231,7 @@ function Comment(props) {
 }
 ```
 
-[Try it on CodePen.](http://codepen.io/gaearon/pen/rrJNJY?editors=0010)
+<a href="/codepen/components-and-props/extracting-components-continued" target="_blank">Try it on CodePen</a>.
 
 Extracting components might seem like grunt work at first, but having a palette of reusable components pays off in larger apps. A good rule of thumb is that if a part of your UI is used several times (`Button`, `Panel`, `Avatar`), or is complex enough on its own (`App`, `FeedStory`, `Comment`), it is a good candidate to be a reusable component.
 

gatsby-node.js

@@ -6,7 +6,8 @@
 
 'use strict';
 
-const {readdirSync, readFileSync} = require('fs');
+const recursiveReaddir = require('recursive-readdir');
+const {readFileSync} = require('fs');
 const {resolve} = require('path');
 const webpack = require('webpack');
 
@@ -170,12 +171,13 @@ exports.createPages = async ({graphql, boundActionCreators}) => {
   // Create Codepen redirects.
   // These use the Codepen prefill API to JIT-create Pens.
   // https://blog.codepen.io/documentation/api/prefill/
-  readdirSync('./codepen').forEach(file => {
+  const files = await recursiveReaddir('./codepen');
+  files.forEach(file => {
     const slug = file.substring(0, file.length - 3); // Trim extension
-    const code = readFileSync(`./codepen/${file}`, 'utf8');
+    const code = readFileSync(file, 'utf8');
 
     createPage({
-      path: `/codepen/${slug}`,
+      path: slug,
       component: resolve('./src/templates/codepen-example.js'),
       context: {
         code,

package.json

@@ -84,6 +84,7 @@
     "reset": "rimraf ./.cache"
   },
   "devDependencies": {
-    "eslint-config-prettier": "^2.6.0"
+    "eslint-config-prettier": "^2.6.0",
+    "recursive-readdir": "^2.2.1"
   }
 }

yarn.lock

@@ -1535,7 +1535,7 @@ bowser@^1.6.0:
   version "1.7.1"
   resolved "https://registry.yarnpkg.com/bowser/-/bowser-1.7.1.tgz#a4de8f18a1a0dc9531eb2a92a1521fb6a9ba96a5"
 
-brace-expansion@^1.1.7:
+brace-expansion@^1.0.0, brace-expansion@^1.1.7:
   version "1.1.8"
   resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.8.tgz#c07b211c7c952ec1f8efd51a77ef0d1d3990a292"
   dependencies:
@@ -6367,6 +6367,12 @@ minimalistic-crypto-utils@^1.0.0, minimalistic-crypto-utils@^1.0.1:
   dependencies:
     brace-expansion "^1.1.7"
 
+minimatch@3.0.3:
+  version "3.0.3"
+  resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.0.3.tgz#2a4e4090b96b2db06a9d7df01055a62a77c9b774"
+  dependencies:
+    brace-expansion "^1.0.0"
+
 minimist@0.0.8:
   version "0.0.8"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
@@ -8054,6 +8060,12 @@ rechoir@^0.6.2:
   dependencies:
     resolve "^1.1.6"
 
+recursive-readdir@^2.2.1:
+  version "2.2.1"
+  resolved "https://registry.yarnpkg.com/recursive-readdir/-/recursive-readdir-2.2.1.tgz#90ef231d0778c5ce093c9a48d74e5c5422d13a99"
+  dependencies:
+    minimatch "3.0.3"
+
 redbox-react@^1.3.6:
   version "1.5.0"
   resolved "https://registry.yarnpkg.com/redbox-react/-/redbox-react-1.5.0.tgz#04dab11557d26651bf3562a67c22ace56c5d3967"