Move Docusaurus 1 files into directory (#966)

* Move Docusaurus 1 into v1 directory

* Update Circle CI commands for new v1 dir

* Remove OC

* Fix tests

v1/lib/server/metadataUtils.js

@@ -0,0 +1,89 @@
+/**
+ * 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.
+ */
+
+// split markdown header
+function splitHeader(content) {
+  // New line characters need to handle all operating systems.
+  const lines = content.split(/\r?\n/);
+  if (lines[0] !== '---') {
+    return {};
+  }
+  let i = 1;
+  for (; i < lines.length - 1; ++i) {
+    if (lines[i] === '---') {
+      break;
+    }
+  }
+  return {
+    header: lines.slice(1, i + 1).join('\n'),
+    content: lines.slice(i + 1).join('\n'),
+  };
+}
+
+// Extract markdown metadata header
+function extractMetadata(content) {
+  const metadata = {};
+  const both = splitHeader(content);
+
+  // if no content returned, then that means there was no header, and both.header is the content
+  if (!both.content) {
+    if (!both.header) {
+      // if no both returned, then that means there was no header and no content => we return the current content of the file
+      return {metadata, rawContent: content};
+    }
+    return {metadata, rawContent: both.header};
+  }
+
+  // New line characters => to handle all operating systems.
+  const lines = both.header.split(/\r?\n/);
+
+  // Loop that add to metadata the current content of the fields of the header
+  // Like the format:
+  // id:
+  // title:
+  // original_id:
+  for (let i = 0; i < lines.length - 1; ++i) {
+    const keyvalue = lines[i].split(':');
+    const key = keyvalue[0].trim();
+    let value = keyvalue
+      .slice(1)
+      .join(':')
+      .trim();
+    try {
+      value = JSON.parse(value);
+    } catch (err) {
+      // Ignore the error as it means it's not a JSON value.
+    }
+    metadata[key] = value;
+  }
+  return {metadata, rawContent: both.content};
+}
+
+// mdToHtml is a map from a markdown file name to its html link, used to
+// change relative markdown links that work on GitHub into actual site links
+function mdToHtml(Metadata, baseUrl) {
+  const result = {};
+  Object.keys(Metadata).forEach(id => {
+    const metadata = Metadata[id];
+    if (metadata.language !== 'en' || metadata.original_id) {
+      return;
+    }
+    let htmlLink = baseUrl + metadata.permalink.replace('/next/', '/');
+    if (htmlLink.includes('/docs/en/')) {
+      htmlLink = htmlLink.replace('/docs/en/', '/docs/en/VERSION/');
+    } else {
+      htmlLink = htmlLink.replace('/docs/', '/docs/VERSION/');
+    }
+    result[metadata.source] = htmlLink;
+  });
+  return result;
+}
+
+module.exports = {
+  extractMetadata,
+  mdToHtml,
+};