fix(v2): hide read more button on non-truncated posts (#2240)

* fix(v2): hide read more button on non-truncated posts

* Update tests

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

@@ -57,6 +57,7 @@ describe('loadBlog', () => {
         permalink: noDatePermalink,
         title: 'no date',
       },
+      truncated: false,
     });
     expect(
       blogPosts.find(v => v.metadata.title === 'Happy 1st Birthday Slash!')
@@ -76,6 +77,7 @@ describe('loadBlog', () => {
         permalink: '/blog/2019/01/01/date-matter',
         title: 'date-matter',
       },
+      truncated: false,
     });
 
     expect(
@@ -91,6 +93,7 @@ describe('loadBlog', () => {
         permalink: '/blog/2019/01/01/date-matter',
         title: 'date-matter',
       },
+      truncated: false,
     });
   });
 });

packages/docusaurus-plugin-content-blog/src/blogUtils.ts

@@ -13,7 +13,7 @@ import {PluginOptions, BlogPost, DateLink} from './types';
 import {parse, normalizeUrl, aliasedSitePath} from '@docusaurus/utils';
 import {LoadContext} from '@docusaurus/types';
 
-export function truncate(fileString: string, truncateMarker: RegExp | string) {
+export function truncate(fileString: string, truncateMarker: RegExp) {
   return fileString.split(truncateMarker, 1).shift()!;
 }
 
@@ -85,7 +85,7 @@ export async function generateBlogPosts(
   {siteConfig, siteDir}: LoadContext,
   options: PluginOptions,
 ) {
-  const {include, routeBasePath} = options;
+  const {include, routeBasePath, truncateMarker} = options;
 
   if (!fs.existsSync(blogDir)) {
     return null;
@@ -105,7 +105,7 @@ export async function generateBlogPosts(
       const blogFileName = path.basename(relativeSource);
 
       const fileString = await fs.readFile(source, 'utf-8');
-      const {frontMatter, excerpt} = parse(fileString);
+      const {frontMatter, content, excerpt} = parse(fileString);
 
       let date;
       // Extract date and title from filename.
@@ -137,6 +137,7 @@ export async function generateBlogPosts(
           date,
           tags: frontMatter.tags,
           title: frontMatter.title,
+          truncated: truncateMarker?.test(content) || false,
         },
       });
     }),

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

@@ -41,7 +41,7 @@ const DEFAULT_OPTIONS: PluginOptions = {
   blogTagsPostsComponent: '@theme/BlogTagsPostsPage',
   remarkPlugins: [],
   rehypePlugins: [],
-  truncateMarker: /<!--\s*(truncate)\s*-->/, // string or regex
+  truncateMarker: /<!--\s*(truncate)\s*-->/, // Regex
 };
 
 function assertFeedTypes(val: any): asserts val is FeedType {

packages/docusaurus-plugin-content-blog/src/markdownLoader.ts

@@ -12,7 +12,7 @@ import {truncate} from './blogUtils';
 export = function(fileString: string) {
   const callback = this.async();
 
-  const {truncateMarker}: {truncateMarker: RegExp | string} = getOptions(this);
+  const {truncateMarker}: {truncateMarker: RegExp} = getOptions(this);
 
   let finalContent = fileString;
 

packages/docusaurus-plugin-content-blog/src/types.ts

@@ -30,7 +30,7 @@ export interface PluginOptions {
   blogTagsPostsComponent: string;
   remarkPlugins: string[];
   rehypePlugins: string[];
-  truncateMarker: RegExp | string;
+  truncateMarker: RegExp;
   feedOptions?: {
     type: FeedType;
     title?: string;
@@ -79,6 +79,7 @@ export interface MetaData {
   title: string;
   prevItem?: Paginator;
   nextItem?: Paginator;
+  truncated: boolean;
 }
 
 export interface Paginator {