feat: rewrite blog to Next.js v13 app directory

Improvement: Support light theme in code block

app/blog/[slug]/page.tsx

@@ -0,0 +1,155 @@
+import type { Metadata } from 'next'
+import { notFound } from 'next/navigation'
+import { cookies } from 'next/headers'
+import Link from 'next/link'
+import Image from 'next/image'
+import { MDXRemote } from 'next-mdx-remote/rsc'
+import { FontAwesomeIcon } from '@fortawesome/react-fontawesome'
+import { faLink } from '@fortawesome/free-solid-svg-icons'
+import date from 'date-and-time'
+import { nodeTypes } from '@mdx-js/mdx'
+import rehypeRaw from 'rehype-raw'
+import remarkGfm from 'remark-gfm'
+import rehypeSlug from 'rehype-slug'
+import remarkMath from 'remark-math'
+import rehypeKatex from 'rehype-katex'
+import { getHighlighter } from 'shiki'
+
+import 'katex/dist/katex.min.css'
+
+import { remarkSyntaxHighlightingPlugin } from '@/utils/remarkSyntaxHighlightingPlugin'
+import { getPostBySlug } from '@/utils/blog'
+import { BlogPostComments } from '@/components/BlogPostComments'
+import { getTheme } from '@/theme/theme.server'
+
+const Heading = (
+  props: React.DetailedHTMLProps<
+    React.HTMLAttributes<HTMLHeadingElement>,
+    HTMLHeadingElement
+  >
+): JSX.Element => {
+  const { children, id = '' } = props
+  return (
+    <h2 {...props} className='group'>
+      <Link
+        href={`#${id}`}
+        className='invisible !text-black group-hover:visible dark:!text-white'
+      >
+        <FontAwesomeIcon className='mr-2 inline h-4 w-4' icon={faLink} />
+      </Link>
+      {children}
+    </h2>
+  )
+}
+
+interface BlogPostPageProps {
+  params: {
+    slug: string
+  }
+}
+
+export const generateMetadata = async (
+  props: BlogPostPageProps
+): Promise<Metadata> => {
+  const post = await getPostBySlug(props.params.slug)
+  if (post == null || !post.frontmatter.isPublished) {
+    return notFound()
+  }
+  const title = `${post.frontmatter.title} | Théo LUDWIG`
+  const description = post.frontmatter.description
+  return {
+    title,
+    description,
+    openGraph: {
+      title,
+      description
+    },
+    twitter: {
+      title,
+      description
+    }
+  }
+}
+
+const BlogPostPage = async (props: BlogPostPageProps): Promise<JSX.Element> => {
+  const { params } = props
+
+  const post = await getPostBySlug(params.slug)
+  if (post == null || !post.frontmatter.isPublished) {
+    return notFound()
+  }
+
+  const cookiesStore = cookies()
+  const theme = getTheme()
+
+  const highlighter = await getHighlighter({
+    theme: `${theme}-plus`
+  })
+
+  return (
+    <main className='break-wrap-words flex flex-1 flex-col flex-wrap items-center'>
+      <div className='my-10 flex flex-col items-center text-center'>
+        <h1 className='text-3xl font-semibold'>{post.frontmatter.title}</h1>
+        <p className='mt-2' data-cy='blog-post-date'>
+          {date.format(new Date(post.frontmatter.publishedOn), 'DD/MM/YYYY')}
+        </p>
+      </div>
+      <div className='prose mb-10'>
+        <div className='px-8'>
+          <MDXRemote
+            source={post.content}
+            options={{
+              mdxOptions: {
+                remarkPlugins: [
+                  remarkGfm,
+                  [remarkSyntaxHighlightingPlugin, { highlighter }],
+                  remarkMath
+                ],
+                rehypePlugins: [
+                  rehypeSlug,
+                  [rehypeRaw, { passThrough: nodeTypes }],
+                  rehypeKatex
+                ]
+              }
+            }}
+            components={{
+              h1: Heading,
+              h2: Heading,
+              h3: Heading,
+              h4: Heading,
+              h5: Heading,
+              h6: Heading,
+              img: (properties) => {
+                const { src = '', alt = 'Blog Image' } = properties
+                const source = src.replace('../public/', '/')
+                return (
+                  <span className='flex flex-col items-center justify-center'>
+                    <Image
+                      src={source}
+                      alt={alt}
+                      width={1000}
+                      height={1000}
+                      className='h-auto w-auto'
+                    />
+                  </span>
+                )
+              },
+              a: (props) => {
+                const { href = '' } = props
+                if (href.startsWith('#')) {
+                  return <a {...props} />
+                }
+                return (
+                  <a target='_blank' rel='noopener noreferrer' {...props} />
+                )
+              }
+            }}
+          />
+          <BlogPostComments cookiesStore={cookiesStore.toString()} />
+        </div>
+      </div>
+    </main>
+  )
+}
+
+export default BlogPostPage

app/blog/page.tsx

@@ -0,0 +1,40 @@
+import { Suspense } from 'react'
+import type { Metadata } from 'next'
+
+import { BlogPosts } from '@/components/BlogPosts'
+import { Loader } from '@/components/Loader/Loader'
+
+const title = 'Blog | Théo LUDWIG'
+const description =
+  'The latest news about my journey of learning computer science.'
+
+export const metadata: Metadata = {
+  title,
+  description,
+  openGraph: {
+    title,
+    description
+  },
+  twitter: {
+    title,
+    description
+  }
+}
+
+const BlogPage = async (): Promise<JSX.Element> => {
+  return (
+    <main className='flex flex-1 flex-col flex-wrap items-center'>
+      <div className='mt-10 flex flex-col items-center'>
+        <h1 className='text-4xl font-semibold'>Blog</h1>
+        <p className='mt-6 text-center' data-cy='blog-post-date'>
+          {description}
+        </p>
+      </div>
+      <Suspense fallback={<Loader className='mt-8' />}>
+        <BlogPosts />
+      </Suspense>
+    </main>
+  )
+}
+
+export default BlogPage

app/layout.tsx

@@ -68,8 +68,8 @@ const RootLayout = (props: RootLayoutProps): JSX.Element => {
         colorScheme: theme
       }}
     >
-      <body className='bg-white font-headline text-black dark:bg-black dark:text-white'>
-        <Header showLocale />
+      <body className='bg-white font-headline text-black dark:bg-black dark:text-white flex flex-col min-h-screen'>
+        <Header />
         {children}
         <Footer />
       </body>

components/BlogPostComments.tsx

@@ -0,0 +1,33 @@
+'use client'
+
+import Giscus from '@giscus/react'
+
+import { useTheme } from '@/theme/theme.client'
+import type { CookiesStore } from '@/utils/constants'
+
+interface BlogPostCommentsProps {
+  cookiesStore: CookiesStore
+}
+
+export const BlogPostComments = (props: BlogPostCommentsProps): JSX.Element => {
+  const { cookiesStore } = props
+
+  const theme = useTheme(cookiesStore)
+
+  return (
+    <Giscus
+      id='comments'
+      repo='theoludwig/theoludwig'
+      repoId='MDEwOlJlcG9zaXRvcnkzNTg5NDg1NDQ='
+      category='General'
+      categoryId='DIC_kwDOFWUewM4CQ_WK'
+      mapping='pathname'
+      reactionsEnabled='1'
+      emitMetadata='0'
+      inputPosition='top'
+      theme={theme}
+      lang='en'
+      loading='lazy'
+    />
+  )
+}

components/BlogPosts.tsx

@@ -0,0 +1,42 @@
+import Link from 'next/link'
+import date from 'date-and-time'
+
+import { ShadowContainer } from '@/components/design/ShadowContainer'
+import { getPosts } from '@/utils/blog'
+
+export const BlogPosts = async (): Promise<JSX.Element> => {
+  const posts = await getPosts()
+
+  return (
+    <div className='flex w-full items-center justify-center p-8'>
+      <div className='w-[1600px]' data-cy='blog-posts'>
+        {posts.map((post, index) => {
+          const postPublishedOn = date.format(
+            new Date(post.frontmatter.publishedOn),
+            'DD/MM/YYYY'
+          )
+          return (
+            <Link
+              href={`/blog/${post.slug}`}
+              key={index}
+              locale='en'
+              data-cy={post.slug}
+            >
+              <ShadowContainer className='cursor-pointer p-6 transition duration-200 ease-in-out hover:-translate-y-2'>
+                <h2 data-cy='blog-post-title' className='text-xl font-semibold'>
+                  {post.frontmatter.title}
+                </h2>
+                <p data-cy='blog-post-date' className='mt-2'>
+                  {postPublishedOn}
+                </p>
+                <p data-cy='blog-post-description' className='mt-3'>
+                  {post.frontmatter.description}
+                </p>
+              </ShadowContainer>
+            </Link>
+          )
+        })}
+      </div>
+    </div>
+  )
+}

components/Header/Locales/index.tsx

@@ -1,5 +1,6 @@
 'use client'
 
+import { usePathname } from 'next/navigation'
 import { useCallback, useEffect, useState, useRef } from 'react'
 import classNames from 'clsx'
 
@@ -16,6 +17,7 @@ export interface LocalesProps {
 
 export const Locales = (props: LocalesProps): JSX.Element => {
   const { currentLocale, cookiesStore } = props
+  const pathname = usePathname()
 
   const [hiddenMenu, setHiddenMenu] = useState(true)
   const languageClickRef = useRef<HTMLDivElement | null>(null)
@@ -48,6 +50,10 @@ export const Locales = (props: LocalesProps): JSX.Element => {
     setLocale(locale)
   }
 
+  if (pathname.startsWith('/blog')) {
+    return <></>
+  }
+
   return (
     <div className='flex cursor-pointer flex-col items-center justify-center'>
       <div

components/Header/index.tsx

@@ -7,13 +7,7 @@ import { getI18n } from '@/i18n/i18n.server'
 import { Locales } from './Locales'
 import { SwitchTheme } from './SwitchTheme'
 
-export interface HeaderProps {
-  showLocale?: boolean
-}
-
-export const Header: React.FC<HeaderProps> = (props) => {
-  const { showLocale = false } = props
-
+export const Header = (): JSX.Element => {
   const cookiesStore = cookies()
   const i18n = getI18n()
 
@@ -44,12 +38,10 @@ export const Header: React.FC<HeaderProps> = (props) => {
             Blog
           </Link>
         </div>
-        {showLocale ? (
-          <Locales
-            currentLocale={i18n.locale}
-            cookiesStore={cookiesStore.toString()}
-          />
-        ) : null}
+        <Locales
+          currentLocale={i18n.locale}
+          cookiesStore={cookiesStore.toString()}
+        />
         <SwitchTheme cookiesStore={cookiesStore.toString()} />
       </div>
     </header>

tailwind.config.js

@@ -19,8 +19,8 @@ const tailwindConfig = {
         }
       },
       boxShadow: {
-        dark: '0px 0px 6px 6px rgba(0, 0, 0, 0.25)',
-        light: '0px 0px 6px 6px rgba(0, 0, 0, 0.10)',
+        dark: '0px 0px 4px 4px rgba(0, 0, 0, 0.25)',
+        light: '0px 0px 4px 4px rgba(0, 0, 0, 0.10)',
         darkFlag: '0px 1px 10px hsla(0, 0%, 100%, 0.2)',
         lightFlag: '0px 1px 10px rgba(0, 0, 0, 0.25)'
       },

utils/blog.ts

@@ -1,23 +1,11 @@
 import fs from 'node:fs'
 import path from 'node:path'
 
-import type { MDXRemoteSerializeResult } from 'next-mdx-remote'
-import { nodeTypes } from '@mdx-js/mdx'
-import rehypeRaw from 'rehype-raw'
-import { serialize } from 'next-mdx-remote/serialize'
-import remarkGfm from 'remark-gfm'
-import rehypeSlug from 'rehype-slug'
-import remarkMath from 'remark-math'
-import rehypeKatex from 'rehype-katex'
+import { cache } from 'react'
 import matter from 'gray-matter'
-import { getHighlighter } from 'shiki'
-
-import { remarkSyntaxHighlightingPlugin } from './remarkSyntaxHighlightingPlugin'
 
 export const POSTS_PATH = path.join(process.cwd(), 'posts')
 
-export type MDXSource = MDXRemoteSerializeResult<Record<string, unknown>>
-
 export interface FrontMatter {
   title: string
   description: string
@@ -25,17 +13,13 @@ export interface FrontMatter {
   publishedOn: string
 }
 
-export interface PostMetadata {
+export interface Post {
   frontmatter: FrontMatter
   slug: string
   content: string
 }
 
-export interface Post extends PostMetadata {
-  source: MDXSource
-}
-
-export const getPosts = async (): Promise<PostMetadata[]> => {
+export const getPosts = cache(async (): Promise<Post[]> => {
   const posts = await fs.promises.readdir(POSTS_PATH)
   const postsWithTime = await Promise.all(
     posts.map(async (postFilename) => {
@@ -68,34 +52,14 @@ export const getPosts = async (): Promise<PostMetadata[]> => {
       return b.time - a.time
     })
   return postsWithTimeSorted
-}
+})
 
-export const getPostBySlug = async (
-  slug?: string | string[]
-): Promise<Post | undefined> => {
-  const posts = await getPosts()
-  const post = posts.find((post) => {
-    return post.slug === slug
-  })
-  if (post == null) {
-    return undefined
+export const getPostBySlug = cache(
+  async (slug: string): Promise<Post | undefined> => {
+    const posts = await getPosts()
+    const post = posts.find((post) => {
+      return post.slug === slug
+    })
+    return post
   }
-  const highlighter = await getHighlighter({
-    theme: 'dark-plus'
-  })
-  const source = await serialize(post.content, {
-    mdxOptions: {
-      remarkPlugins: [
-        remarkGfm,
-        [remarkSyntaxHighlightingPlugin, { highlighter }],
-        remarkMath
-      ],
-      rehypePlugins: [
-        rehypeSlug,
-        [rehypeRaw, { passThrough: nodeTypes }],
-        rehypeKatex
-      ]
-    }
-  })
-  return { ...post, source }
-}
+)