Enable versioned docs (#1106)

* Enable versioned doc

* Start adding 6.0 docs

* Rename 5.1.1 to 5.x and make it work

* Cast v6.x versioned docs

* Display v7.x as pre-release version

Author: wgao19

website/pages/en/versions.js

@@ -0,0 +1,104 @@
+/**
+  * Copyright (c) 2017-present, Facebook, Inc.
+  *
+  * This source code is licensed under the MIT license found in the
+  * LICENSE file in the root directory of this source tree.
+  */
+
+ const React = require('react');
+
+ const CompLibrary = require('../../core/CompLibrary');
+
+ const Container = CompLibrary.Container;
+
+ const CWD = process.cwd();
+
+ const siteConfig = require(`${CWD}/siteConfig.js`);
+ const versions = require(`${CWD}/versions.json`);
+
+ const versionToReleaseTags = {
+   '5.x': '5.0.0',
+   '6.x': '6.0.0',
+   '7.x': '7.0.0-beta.0'
+ }
+
+ function Versions() {
+   const latestVersion = versions[0];
+   const repoUrl = `https://github.com/${siteConfig.organizationName}/${
+     siteConfig.projectName
+   }`;
+   const releaseTagUrl = version => versionToReleaseTags.hasOwnProperty(version) ? `${repoUrl}/releases/tag/v${versionToReleaseTags[version]}` : `${repoUrl}/releases/tag/v${version}`
+   return (
+     <div className="docMainWrapper wrapper">
+       <Container className="mainContainer versionsContainer">
+         <div className="post">
+           <header className="postHeader">
+             <h1>{siteConfig.title} Versions</h1>
+           </header>
+           <p>New versions of this project are released every so often.</p>
+           <h3 id="latest">Current version (Stable)</h3>
+           <table className="versions">
+             <tbody>
+               <tr>
+                 <th>{latestVersion}</th>
+                 <td>
+                   <a href="/introduction/quick-start">Documentation</a>
+                 </td>
+                 <td>
+                   <a href={releaseTagUrl(latestVersion)}>Release Notes</a>
+                 </td>
+               </tr>
+             </tbody>
+           </table>
+           <p>
+             This is the version that is configured automatically when you first
+             install this project.
+           </p>
+           {
+             !!siteConfig.nextVersion && (<React.Fragment>
+<h3 id="rc">Pre-release versions</h3>
+           <table className="versions">
+             <tbody>
+               <tr>
+                 <th>{siteConfig.nextVersion}</th>
+                 <td>
+                   <a href={`/next/introduction/quick-start`}>Documentation</a>
+                 </td>
+                 <td>
+                   <a href={releaseTagUrl(siteConfig.nextVersion)}>Release Notes</a>
+                 </td>
+               </tr>
+             </tbody>
+           </table>
+             </React.Fragment>)
+           }
+           <h3 id="archive">Past Versions</h3>
+           <table className="versions">
+             <tbody>
+               {versions.map(
+                 version =>
+                   version !== latestVersion && (
+                     <tr key={`version-${version}`}>
+                       <th>{version}</th>
+                       <td>
+                         <a href={`${version}/introduction/quick-start`}>Documentation</a>
+                       </td>
+                       <td>
+                         <a href={releaseTagUrl(version)}>Release Notes</a>
+                       </td>
+                     </tr>
+                   ),
+               )}
+             </tbody>
+           </table>
+           <p>
+             You can find past versions of this project on{' '}
+             <a href={repoUrl}>GitHub</a>.
+           </p>
+         </div>
+       </Container>
+     </div>
+   );
+ }
+
+ module.exports = Versions;

website/siteConfig.js

@@ -98,6 +98,15 @@ const siteConfig = {
   // template. For example, if you need your repo's URL...
   repoUrl: "https://github.com/reduxjs/react-redux",
 
+  /**
+   * Note:
+   * This will generate a link on the versioned docs page for "pre-release versions"
+   * Once next version is released, run "yarn run version 7.x", and docusaurus will add 7.x to stable version
+   * After that, 7.x will no longer appear in "pre-release" versions and we should remove this line
+   * More info: https://docusaurus.io/docs/en/versioning
+   */
+  nextVersion: "7.x",
+  
   gaTrackingId : "UA-130598673-2",
 };