refactor(v2): plugin, utils as separate package (#1298)

* refactor(v2): plugin, utils as separate package

* rename docusaurus-plugin to @docusaurus/plugin

* update snapshot

packages/docusaurus-plugin-content-pages/index.js

@@ -0,0 +1,111 @@
+/**
+ * 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 globby = require('globby');
+const path = require('path');
+
+// TODO: Do not make it relative because plugins can be from node_modules.
+const {encodePath, fileToPath, idx} = require('@docusaurus/utils');
+
+const DEFAULT_OPTIONS = {
+  metadataKey: 'pagesMetadata',
+  metadataFileName: 'pagesMetadata.json',
+  path: 'pages', // Path to data on filesystem.
+  routeBasePath: '', // URL Route.
+  include: ['**/*.{js,jsx}'], // Extensions to include.
+  component: '@theme/Pages',
+};
+
+class DocusaurusPluginContentPages {
+  constructor(opts, context) {
+    this.options = {...DEFAULT_OPTIONS, ...opts};
+    this.context = context;
+    this.contentPath = path.resolve(this.context.siteDir, this.options.path);
+  }
+
+  getName() {
+    return 'docusaurus-plugin-content-pages';
+  }
+
+  async loadContents() {
+    const {include} = this.options;
+    const {env, siteConfig} = this.context;
+    const pagesDir = this.contentPath;
+
+    const {baseUrl} = siteConfig;
+    const pagesFiles = await globby(include, {
+      cwd: pagesDir,
+    });
+
+    // Prepare metadata container.
+    const pagesMetadatas = [];
+
+    // Translation.
+    const translationEnabled = idx(env, ['translation', 'enabled']);
+    const enabledLanguages =
+      translationEnabled && idx(env, ['translation', 'enabledLanguages']);
+    const enabledLangTags =
+      (enabledLanguages && enabledLanguages.map(lang => lang.tag)) || [];
+    const defaultLangTag = idx(env, ['translation', 'defaultLanguage', 'tag']);
+
+    await Promise.all(
+      pagesFiles.map(async relativeSource => {
+        const source = path.join(pagesDir, relativeSource);
+        const pathName = encodePath(fileToPath(relativeSource));
+        if (translationEnabled && enabledLangTags.length > 0) {
+          enabledLangTags.forEach(langTag => {
+            // Default lang should also be available. E.g: /en/users and /users is the same.
+            if (langTag === defaultLangTag) {
+              pagesMetadatas.push({
+                permalink: pathName.replace(/^\//, baseUrl),
+                language: langTag,
+                source,
+              });
+            }
+
+            const metadata = {
+              permalink: pathName.replace(/^\//, `${baseUrl}${langTag}/`),
+              language: langTag,
+              source,
+            };
+            pagesMetadatas.push(metadata);
+          });
+        } else {
+          // Default Language.
+          const metadata = {
+            permalink: pathName.replace(/^\//, baseUrl),
+            source,
+          };
+          pagesMetadatas.push(metadata);
+        }
+      }),
+    );
+
+    return pagesMetadatas;
+  }
+
+  async generateRoutes({metadata, actions}) {
+    const {component} = this.options;
+    const {addRoute} = actions;
+
+    metadata.forEach(metadataItem => {
+      const {permalink, source} = metadataItem;
+      addRoute({
+        path: permalink,
+        component,
+        metadata: metadataItem,
+        modules: [source],
+      });
+    });
+  }
+
+  getPathsToWatch() {
+    return [this.contentPath];
+  }
+}
+
+module.exports = DocusaurusPluginContentPages;