refactor(v2): convert plugins into a class

v2/plugins/docusaurus-content-blog.js

@@ -28,79 +28,79 @@ const DEFAULT_OPTIONS = {
   cachePath: 'blogMetadata.js',
 };
 
-async function onLoadContent(opts, context) {
-  const options = {...DEFAULT_OPTIONS, ...opts};
-
-  const {env, siteConfig, siteDir} = context;
-  const {pageCount, path: filePath, routeBasePath} = options;
-  const blogDir = path.resolve(siteDir, filePath);
-  const {baseUrl} = siteConfig;
-
-  const blogFiles = await globby(options.include, {
-    cwd: blogDir,
-  });
-
-  // Prepare metadata container.
-  const blogMetadata = [];
-
-  // Language for each blog page.
-  const defaultLangTag = idx(env, ['translation', 'defaultLanguage', 'tag']);
-
-  await Promise.all(
-    blogFiles.map(async relativeSource => {
-      const source = path.join(blogDir, relativeSource);
-
-      const blogFileName = path.basename(relativeSource);
-      // Extract, YYYY, MM, DD from the file name.
-      const filePathDateArr = blogFileName.split('-');
-      const date = new Date(
-        `${filePathDateArr[0]}-${filePathDateArr[1]}-${
-          filePathDateArr[2]
-        }T06:00:00.000Z`,
-      );
-
-      const fileString = await fs.readFile(source, 'utf-8');
-      const {metadata: rawMetadata} = parse(fileString);
-      const metadata = {
-        permalink: normalizeUrl([
-          baseUrl,
-          routeBasePath,
-          fileToUrl(blogFileName),
-        ]),
-        source,
-        ...rawMetadata,
-        date,
-        language: defaultLangTag,
-      };
-      blogMetadata.push(metadata);
-    }),
-  );
-  blogMetadata.sort((a, b) => a.date - b.date);
-
-  // Blog page handling. Example: `/blog`, `/blog/page1`, `/blog/page2`
-  const numOfBlog = blogMetadata.length;
-  const numberOfPage = Math.ceil(numOfBlog / pageCount);
-  const basePageUrl = path.join(baseUrl, routeBasePath);
-
-  // eslint-disable-next-line
-  for (let page = 0; page < numberOfPage; page++) {
-    blogMetadata.push({
-      permalink: normalizeUrl([
-        basePageUrl,
-        `${page > 0 ? `page${page + 1}` : ''}`,
-      ]),
-      language: defaultLangTag,
-      isBlogPage: true,
-      posts: blogMetadata.slice(page * pageCount, (page + 1) * pageCount),
-    });
+class DocusaurusContentBlogPlugin {
+  constructor(opts, context) {
+    this.options = {...DEFAULT_OPTIONS, ...opts};
+    this.context = context;
   }
 
-  return {
-    contents: blogMetadata,
-    options,
-  };
+  async load() {
+    const {pageCount, path: filePath, include, routeBasePath} = this.options;
+    const {env, siteConfig, siteDir} = this.context;
+    const blogDir = path.resolve(siteDir, filePath);
+    const {baseUrl} = siteConfig;
+
+    const blogFiles = await globby(include, {
+      cwd: blogDir,
+    });
+
+    // Prepare metadata container.
+    const blogMetadata = [];
+
+    // Language for each blog page.
+    const defaultLangTag = idx(env, ['translation', 'defaultLanguage', 'tag']);
+
+    await Promise.all(
+      blogFiles.map(async relativeSource => {
+        const source = path.join(blogDir, relativeSource);
+
+        const blogFileName = path.basename(relativeSource);
+        // Extract, YYYY, MM, DD from the file name.
+        const filePathDateArr = blogFileName.split('-');
+        const date = new Date(
+          `${filePathDateArr[0]}-${filePathDateArr[1]}-${
+            filePathDateArr[2]
+          }T06:00:00.000Z`,
+        );
+
+        const fileString = await fs.readFile(source, 'utf-8');
+        const {metadata: rawMetadata} = parse(fileString);
+        const metadata = {
+          permalink: normalizeUrl([
+            baseUrl,
+            routeBasePath,
+            fileToUrl(blogFileName),
+          ]),
+          source,
+          ...rawMetadata,
+          date,
+          language: defaultLangTag,
+        };
+        blogMetadata.push(metadata);
+      }),
+    );
+    blogMetadata.sort((a, b) => a.date - b.date);
+
+    // Blog page handling. Example: `/blog`, `/blog/page1`, `/blog/page2`
+    const numOfBlog = blogMetadata.length;
+    const numberOfPage = Math.ceil(numOfBlog / pageCount);
+    const basePageUrl = path.join(baseUrl, routeBasePath);
+
+    // eslint-disable-next-line
+    for (let page = 0; page < numberOfPage; page++) {
+      blogMetadata.push({
+        permalink: normalizeUrl([
+          basePageUrl,
+          `${page > 0 ? `page${page + 1}` : ''}`,
+        ]),
+        language: defaultLangTag,
+        isBlogPage: true,
+        posts: blogMetadata.slice(page * pageCount, (page + 1) * pageCount),
+      });
+    }
+
+    return blogMetadata;
+  }
 }
 
-module.exports = {
-  onLoadContent,
-};
+module.exports = DocusaurusContentBlogPlugin;