Added gatsby-remark-babel-repl-link plug-in

content/tutorial/tutorial.md

@@ -129,7 +129,7 @@ return React.createElement('div', {className: 'shopping-list'},
 );
 ```
 
-[See full expanded version.](https://babeljs.io/repl/#?babili=false&evaluate=false&lineWrap=false&presets=react&targets=&browsers=&builtIns=false&debug=false&experimental=false&loose=false&spec=false&playground=true&code=%3Cdiv%20className%3D%22shopping-list%22%3E%0A%20%20%3Ch1%3EShopping%20List%20for%20%7Bprops.name%7D%3C%2Fh1%3E%0A%20%20%3Cul%3E%0A%20%20%20%20%3Cli%3EInstagram%3C%2Fli%3E%0A%20%20%20%20%3Cli%3EWhatsApp%3C%2Fli%3E%0A%20%20%20%20%3Cli%3EOculus%3C%2Fli%3E%0A%20%20%3C%2Ful%3E%0A%3C%2Fdiv%3E)
+[See full expanded version.](babel-repl://tutorial-expanded-version)
 
 If you're curious, `createElement()` is described in more detail in the [API reference](/docs/react-api.html#createelement), but we won't be using it directly in this tutorial. Instead, we will keep using JSX.
 

examples/tutorial-expanded-version.js

@@ -0,0 +1,8 @@
+<div className="shopping-list">
+  <h1>Shopping List for {props.name}</h1>
+  <ul>
+    <li>Instagram</li>
+    <li>WhatsApp</li>
+    <li>Oculus</li>
+  </ul>
+</div>

gatsby-config.js

@@ -62,6 +62,12 @@ module.exports = {
               directory: 'examples',
             },
           },
+          {
+            resolve: 'gatsby-remark-babel-repl-link',
+            options: {
+              directory: 'examples',
+            },
+          },
           'gatsby-remark-use-jsx',
           {
             resolve: 'gatsby-remark-prismjs',

package.json

@@ -85,6 +85,7 @@
   },
   "devDependencies": {
     "eslint-config-prettier": "^2.6.0",
+    "lz-string": "^1.4.4",
     "recursive-readdir": "^2.2.1",
     "unist-util-map": "^1.0.3"
   }

plugins/gatsby-remark-babel-repl-link/index.js

@@ -0,0 +1,68 @@
+const {existsSync, readFileSync} = require('fs');
+const LZString = require('lz-string');
+const {join} = require('path');
+const map = require('unist-util-map');
+
+const PROTOCOL = 'babel-repl://';
+
+// Matches compression used in Babel REPL
+// https://github.com/babel/website/blob/master/js/repl/UriUtils.js
+const compress = string =>
+  LZString.compressToBase64(string)
+    .replace(/\+/g, '-') // Convert '+' to '-'
+    .replace(/\//g, '_') // Convert '/' to '_'
+    .replace(/=+$/, ''); // Remove ending '='
+
+module.exports = ({markdownAST}, {directory}) => {
+  map(markdownAST, (node, index, parent) => {
+    if (!directory.endsWith('/')) {
+      directory += '/';
+    }
+
+    if (node.type === 'link' && node.url.startsWith(PROTOCOL)) {
+      let filePath = node.url.replace(PROTOCOL, directory);
+      if (!filePath.endsWith('.js')) {
+        filePath += '.js';
+      }
+      filePath = join(__dirname, '../..', filePath);
+
+      // Verify that the specified example file exists.
+      if (!existsSync(filePath)) {
+        console.error(
+          `Invalid Babel REPL link specified; no such file "${filePath}"`,
+        );
+        process.exit(1);
+      }
+
+      const code = compress(readFileSync(filePath, 'utf8'));
+      const href = `https://babeljs.io/repl/#?presets=react&code_lz=${code}`;
+      const text = node.children[0].value;
+
+      const anchorOpenNode = {
+        type: 'html',
+        value: `<a href="${href}" target="_blank">`,
+      };
+
+      const textNode = {
+        type: 'text',
+        value: text,
+      };
+
+      const anchorCloseNode = {
+        type: 'html',
+        value: '</a>',
+      };
+
+      parent.children.splice(
+        index,
+        1,
+        anchorOpenNode,
+        textNode,
+        anchorCloseNode,
+      );
+    }
+
+    // No change
+    return node;
+  });
+};

plugins/gatsby-remark-babel-repl-link/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "gatsby-remark-babel-repl-link",
+  "version": "0.0.1"
+}

plugins/gatsby-remark-codepen-examples/index.js

@@ -5,7 +5,6 @@ const map = require('unist-util-map');
 const CODEPEN_PROTOCOL = 'codepen://';
 const DEFAULT_LINK_TEXT = 'Try it on CodePen';
 
-// TODO target="_blank"
 module.exports = ({markdownAST}, {directory}) => {
   map(markdownAST, (node, index, parent) => {
     if (!directory.startsWith('/')) {
@@ -22,7 +21,7 @@ module.exports = ({markdownAST}, {directory}) => {
     // from: [Try the Hello World example on CodePen](codepen:hello-world)
     // to: <a href="/<directory>/hello-world" target="_blank">Try the Hello World example on CodePen</a>
     if (node.type === 'link' && node.url.startsWith(CODEPEN_PROTOCOL)) {
-      const href = node.url.replace(CODEPEN_PROTOCOL, `${directory}`);
+      const href = node.url.replace(CODEPEN_PROTOCOL, directory);
       const text =
         node.children.length === 0 ? DEFAULT_LINK_TEXT : node.children[0].value;
 

yarn.lock

@@ -6086,6 +6086,10 @@ ltcdr@^2.2.1:
   version "2.2.1"
   resolved "https://registry.yarnpkg.com/ltcdr/-/ltcdr-2.2.1.tgz#5ab87ad1d4c1dab8e8c08bbf037ee0c1902287cf"
 
+lz-string@^1.4.4:
+  version "1.4.4"
+  resolved "https://registry.yarnpkg.com/lz-string/-/lz-string-1.4.4.tgz#c0d8eaf36059f705796e1e344811cf4c498d3a26"
+
 macaddress@^0.2.8:
   version "0.2.8"
   resolved "https://registry.yarnpkg.com/macaddress/-/macaddress-0.2.8.tgz#5904dc537c39ec6dbefeae902327135fa8511f12"