feat(v2): blog support date front matter (#1702)

* feat(v2): blog support date front matter

* feat(v2): blog support date front matter

* feat(v2): blog support date front matter

* feat(v2): blog support date front matter

* Update CHANGELOG-2.x.md

CHANGELOG-2.x.md

@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+- Add `date` frontMatter support for blog plugin
 - Add `truncateMarker` option to blog plugin, support string or regex.
 - Webpack `optimization.removeAvailableModules` is now disabled for performance gain. See https://github.com/webpack/webpack/releases/tag/v4.38.0 for more context.
 

packages/docusaurus-plugin-content-blog/src/__tests__/__fixtures__/website/blog/2018-12-14-Happy-First-Birthday-Slash.md

@@ -0,0 +1,5 @@
+---
+title: Happy 1st Birthday Slash!
+---
+
+pattern name

packages/docusaurus-plugin-content-blog/src/__tests__/__fixtures__/website/blog/date-matter.md

@@ -0,0 +1,5 @@
+---
+date: 2019-01-01
+---
+
+date inside front matter

packages/docusaurus-plugin-content-blog/src/__tests__/__fixtures__/website/blog/no date.md

@@ -0,0 +1 @@
+no date

packages/docusaurus-plugin-content-blog/src/__tests__/index.test.js

@@ -0,0 +1,76 @@
+/**
+ * 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.
+ */
+
+import fs from 'fs-extra';
+import path from 'path';
+import pluginContentBlog from '../index';
+
+describe('loadBlog', () => {
+  test('simple website', async () => {
+    const siteDir = path.join(__dirname, '__fixtures__', 'website');
+    const siteConfig = {
+      title: 'Hello',
+      baseUrl: '/',
+      url: 'https://docusaurus.io',
+    };
+    const pluginPath = 'blog';
+    const plugin = pluginContentBlog(
+      {
+        siteDir,
+        siteConfig,
+      },
+      {
+        path: 'blog',
+      },
+    );
+    const {blogPosts} = await plugin.loadContent();
+
+    expect(
+      blogPosts.find(v => v.metadata.title === 'date-matter').metadata,
+    ).toEqual({
+      permalink: '/blog/2019/01/01/date-matter',
+      source: path.join('@site', pluginPath, 'date-matter.md'),
+      title: 'date-matter',
+      description: `date inside front matter`,
+      date: new Date('2019-01-01'),
+      tags: [],
+    });
+    expect(
+      blogPosts.find(v => v.metadata.title === 'Happy 1st Birthday Slash!')
+        .metadata,
+    ).toEqual({
+      permalink: '/blog/2018/12/14/Happy-First-Birthday-Slash',
+      source: path.join(
+        '@site',
+        pluginPath,
+        '2018-12-14-Happy-First-Birthday-Slash.md',
+      ),
+      title: 'Happy 1st Birthday Slash!',
+      description: `pattern name`,
+      date: new Date('2018-12-14'),
+      tags: [],
+    });
+
+    const noDateSource = path.join('@site', pluginPath, 'no date.md');
+    const noDateSourceBirthTime = (await fs.stat(
+      noDateSource.replace('@site', siteDir),
+    )).birthtime;
+    expect(
+      blogPosts.find(v => v.metadata.title === 'no date').metadata,
+    ).toEqual({
+      permalink: `/blog/${noDateSourceBirthTime
+        .toISOString()
+        .substr(0, '2019-01-01'.length)
+        .replace(/-/g, '/')}/no date`,
+      source: noDateSource,
+      title: 'no date',
+      description: `no date`,
+      date: noDateSourceBirthTime,
+      tags: [],
+    });
+  });
+});

packages/docusaurus-plugin-content-blog/src/index.js

@@ -11,13 +11,15 @@ const _ = require('lodash');
 const path = require('path');
 const {parse, normalizeUrl, docuHash} = require('@docusaurus/utils');
 
-// TODO: Use a better slugify function that doesn't rely on a specific file extension.
+// YYYY-MM-DD-{name}.mdx?
-function fileToUrl(fileName) {
+// prefer named capture, but old node version do not support
-  return fileName
+const FILENAME_PATTERN = /^(\d{4}-\d{1,2}-\d{1,2})-?(.*?).mdx?$/;
-    .replace('-', '/')
+
-    .replace('-', '/')
+function toUrl({date, link}) {
-    .replace('-', '/')
+  return `${date
-    .replace(/\.mdx?$/, '');
+    .toISOString()
+    .substring(0, '2019-01-01'.length)
+    .replace(/-/g, '/')}/${link}`;
 }
 
 const DEFAULT_OPTIONS = {
@@ -70,30 +72,40 @@ module.exports = function(context, opts) {
           const source = path.join(blogDir, relativeSource);
           const aliasedSource = `@site/${path.relative(siteDir, source)}`;
           const blogFileName = path.basename(relativeSource);
-          // Extract, YYYY, MM, DD from the file name.
-          const filePathDateArr = blogFileName.split('-');
-          const date = new Date(
-            `${filePathDateArr[0]}-${filePathDateArr[1]}-${
-              filePathDateArr[2]
-            }T06:00:00.000Z`,
-          );
 
           const fileString = await fs.readFile(source, 'utf-8');
           const {frontMatter, excerpt} = parse(fileString);
 
+          let date;
+          // extract date and title from filename
+          const match = blogFileName.match(FILENAME_PATTERN);
+          let linkName = blogFileName.replace(/\.mdx?$/, '');
+          if (match) {
+            const [, dateString, name] = match;
+            date = new Date(dateString);
+            linkName = name;
+          }
+          // prefer usedefined date
+          if (frontMatter.date) {
+            date = new Date(frontMatter.date);
+          }
+          // use file create time for blog
+          date = date || (await fs.stat(source)).birthtime;
+          frontMatter.title = frontMatter.title || linkName;
+
           blogPosts.push({
-            id: frontMatter.id || blogFileName,
+            id: frontMatter.id || frontMatter.title,
             metadata: {
               permalink: normalizeUrl([
                 baseUrl,
                 routeBasePath,
-                frontMatter.id || fileToUrl(blogFileName),
+                frontMatter.id || toUrl({date, link: linkName}),
               ]),
               source: aliasedSource,
               description: frontMatter.description || excerpt,
               date,
               tags: frontMatter.tags,
-              title: frontMatter.title || blogFileName,
+              title: frontMatter.title,
             },
           });
         }),