From a62f420f4de93c25f76624d27315f60ba7101b14 Mon Sep 17 00:00:00 2001
From: DefectingCat <i@defect.ink>
Date: Tue, 23 Aug 2022 15:04:51 +0800
Subject: [PATCH] Add blog post pagination

---
 components/RUA/RUAPagination.tsx |  6 ++-
 layouts/BlogList.tsx             | 24 ++++++++++
 lib/posts.ts                     | 19 ++++++++
 pages/blog.tsx                   | 48 -------------------
 pages/blog/[page].tsx            | 79 ++++++++++++++++++++++++++++++++
 pages/blog/index.tsx             | 67 +++++++++++++++++++++++++++
 pages/gists/[p].tsx              | 20 +++++++-
 pages/gists/index.tsx            | 13 ++++--
 8 files changed, 220 insertions(+), 56 deletions(-)
 create mode 100644 layouts/BlogList.tsx
 delete mode 100644 pages/blog.tsx
 create mode 100644 pages/blog/[page].tsx
 create mode 100644 pages/blog/index.tsx

diff --git a/components/RUA/RUAPagination.tsx b/components/RUA/RUAPagination.tsx
index 0fd7e56..588a813 100644
--- a/components/RUA/RUAPagination.tsx
+++ b/components/RUA/RUAPagination.tsx
@@ -1,5 +1,6 @@
 import dynamic from 'next/dynamic';
 import Link from 'next/link';
+import { DetailedHTMLProps, HTMLAttributes } from 'react';
 
 const Button = dynamic(() => import('components/RUA/Button'));
 
@@ -10,7 +11,7 @@ type Props = {
   nextLink: string;
   current?: number;
   total?: number;
-};
+} & DetailedHTMLProps<HTMLAttributes<HTMLElement>, HTMLElement>;
 
 const RUAPagination = ({
   hasPrev,
@@ -19,10 +20,11 @@ const RUAPagination = ({
   nextLink,
   current,
   total,
+  ...rest
 }: Props) => {
   return (
     <>
-      <nav>
+      <nav {...rest}>
         <ul className="flex items-center justify-between -space-x-px">
           <li>
             {hasPrev ? (
diff --git a/layouts/BlogList.tsx b/layouts/BlogList.tsx
new file mode 100644
index 0000000..49d3703
--- /dev/null
+++ b/layouts/BlogList.tsx
@@ -0,0 +1,24 @@
+import cn from 'classnames';
+
+type Props = {
+  children: React.ReactElement | React.ReactElement[];
+};
+
+const BlogList = ({ children }: Props) => {
+  return (
+    <>
+      <h1
+        className={cn(
+          'text-5xl font-bold text-center font-Barlow',
+          'mt-8 mb-20 text-gray-800 dark:text-gray-200'
+        )}
+      >
+        Blog posts
+      </h1>
+
+      <div className="px-4 lg:px-0">{children}</div>
+    </>
+  );
+};
+
+export default BlogList;
diff --git a/lib/posts.ts b/lib/posts.ts
index 6eeabcb..c68ab05 100644
--- a/lib/posts.ts
+++ b/lib/posts.ts
@@ -33,6 +33,25 @@ export const postLists = async (): Promise<Post[]> => {
   return (await Promise.all(files.map(readFileMeta))).sort(sortByDate);
 };
 
+/**
+ * Get posts list page.
+ */
+export const PostPerPage = 5;
+export type PostPath = { params: { page: string } };
+const postPathCallback = (prev: PostPath[], _: unknown, i: number) =>
+  i + 1 > 2
+    ? prev.concat({
+        params: { page: (i + 1).toString() },
+      })
+    : prev;
+export const getPostListPath = async () => {
+  const length = (await fs.readdir(path.join(dataPath))).length;
+  const pages = Math.ceil(length / PostPerPage);
+  return Array.from({ length: pages }).reduce<PostPath[]>(postPathCallback, [
+    { params: { page: '2' } },
+  ]);
+};
+
 /**
  * Replace file name.
  * @param filename
diff --git a/pages/blog.tsx b/pages/blog.tsx
deleted file mode 100644
index 2917485..0000000
--- a/pages/blog.tsx
+++ /dev/null
@@ -1,48 +0,0 @@
-import cn from 'classnames';
-import PostCardLoading from 'components/RUA/loading/PostCardLoading';
-import { postLists } from 'lib/posts';
-import { InferGetStaticPropsType } from 'next';
-import dynamic from 'next/dynamic';
-import { ReactElement } from 'react';
-
-const PostCard = dynamic(() => import('components/PostCard'), {
-  loading: () => <PostCardLoading />,
-});
-const MainLayout = dynamic(() => import('layouts/MainLayout'));
-
-const Blog = ({ posts }: InferGetStaticPropsType<typeof getStaticProps>) => {
-  return (
-    <>
-      <main className="max-w-4xl mx-auto">
-        <h1
-          className={cn(
-            'text-5xl font-bold text-center font-Barlow',
-            'mt-8 mb-20 text-gray-800 dark:text-gray-200'
-          )}
-        >
-          Blog posts
-        </h1>
-
-        <div className="px-4 lg:px-0">
-          {posts.map((post) => (
-            <PostCard key={post.slug} post={post} />
-          ))}
-        </div>
-      </main>
-    </>
-  );
-};
-
-export const getStaticProps = async () => {
-  return {
-    props: {
-      posts: await postLists(),
-    },
-  };
-};
-
-Blog.getLayout = function getLayout(page: ReactElement) {
-  return <MainLayout>{page}</MainLayout>;
-};
-
-export default Blog;
diff --git a/pages/blog/[page].tsx b/pages/blog/[page].tsx
new file mode 100644
index 0000000..f6e4187
--- /dev/null
+++ b/pages/blog/[page].tsx
@@ -0,0 +1,79 @@
+import PostCardLoading from 'components/RUA/loading/PostCardLoading';
+import { getPostListPath, postLists, PostPerPage } from 'lib/posts';
+import { GetStaticPaths, GetStaticProps, InferGetStaticPropsType } from 'next';
+import dynamic from 'next/dynamic';
+import { ReactElement } from 'react';
+import { Post } from 'types';
+
+const PostCard = dynamic(() => import('components/PostCard'), {
+  loading: () => <PostCardLoading />,
+});
+const MainLayout = dynamic(() => import('layouts/MainLayout'));
+const BlogList = dynamic(() => import('layouts/BlogList'));
+const Pagination = dynamic(() => import('components/RUA/RUAPagination'));
+
+const BlogPage = ({
+  posts,
+  prev,
+  next,
+  total,
+}: InferGetStaticPropsType<typeof getStaticProps>) => {
+  return (
+    <>
+      <main className="max-w-4xl mx-auto">
+        <BlogList>
+          {posts.map((post) => (
+            <PostCard key={post.slug} post={post} />
+          ))}
+        </BlogList>
+
+        <Pagination
+          className="py-6 px-7 lg:px-5"
+          hasPrev={!!prev}
+          hasNext={next === total}
+          prevLink={prev === 1 ? '/blog' : `/blog/${prev}`}
+          nextLink={`/blog/${next}`}
+          current={next - 1}
+          total={total}
+        />
+      </main>
+    </>
+  );
+};
+
+export const getStaticPaths: GetStaticPaths = async () => {
+  return {
+    paths: await getPostListPath(),
+    fallback: false,
+  };
+};
+
+export const getStaticProps: GetStaticProps<{
+  posts: Post[];
+  prev: number;
+  next: number;
+  total: number;
+}> = async ({ params }) => {
+  const page = Number(params?.page);
+  if (!page) {
+    return {
+      notFound: true,
+    };
+  }
+  const posts = await postLists();
+
+  return {
+    props: {
+      posts: posts.slice(page, PostPerPage),
+      prev: page - 1,
+      next: page + 1,
+      total: Math.ceil(posts.length / PostPerPage),
+    },
+  };
+};
+
+BlogPage.getLayout = function getLayout(page: ReactElement) {
+  return <MainLayout>{page}</MainLayout>;
+};
+
+export default BlogPage;
diff --git a/pages/blog/index.tsx b/pages/blog/index.tsx
new file mode 100644
index 0000000..cd83470
--- /dev/null
+++ b/pages/blog/index.tsx
@@ -0,0 +1,67 @@
+import cn from 'classnames';
+import PostCardLoading from 'components/RUA/loading/PostCardLoading';
+import { postLists, PostPerPage } from 'lib/posts';
+import { GetStaticProps, InferGetStaticPropsType } from 'next';
+import dynamic from 'next/dynamic';
+import { ReactElement } from 'react';
+import { Post } from 'types';
+
+const PostCard = dynamic(() => import('components/PostCard'), {
+  loading: () => <PostCardLoading />,
+});
+const MainLayout = dynamic(() => import('layouts/MainLayout'));
+const BlogList = dynamic(() => import('layouts/BlogList'));
+const Pagination = dynamic(() => import('components/RUA/RUAPagination'));
+
+const Blog = ({
+  posts,
+  prev,
+  next,
+  total,
+}: InferGetStaticPropsType<typeof getStaticProps>) => {
+  return (
+    <>
+      <main className="max-w-4xl mx-auto">
+        <BlogList>
+          {posts.map((post) => (
+            <PostCard key={post.slug} post={post} />
+          ))}
+        </BlogList>
+
+        <Pagination
+          className="py-6 px-7 lg:px-5"
+          hasPrev={false}
+          hasNext={next === total}
+          prevLink={''}
+          nextLink={`/blog/${next}`}
+          current={1}
+          total={total}
+        />
+      </main>
+    </>
+  );
+};
+
+export const getStaticProps: GetStaticProps<{
+  posts: Post[];
+  prev: number;
+  next: number;
+  total: number;
+}> = async () => {
+  const posts = await postLists();
+  return {
+    props: {
+      // Latest posts.
+      posts: posts.slice(0, PostPerPage),
+      prev: 0,
+      next: 2,
+      total: Math.ceil(posts.length / PostPerPage),
+    },
+  };
+};
+
+Blog.getLayout = function getLayout(page: ReactElement) {
+  return <MainLayout>{page}</MainLayout>;
+};
+
+export default Blog;
diff --git a/pages/gists/[p].tsx b/pages/gists/[p].tsx
index 3e3441a..9dea1e1 100644
--- a/pages/gists/[p].tsx
+++ b/pages/gists/[p].tsx
@@ -9,13 +9,16 @@ import { ReactElement } from 'react';
 const MainLayout = dynamic(() => import('layouts/MainLayout'));
 const UserInfo = dynamic(() => import('components/gists/UserInfo'));
 const FileContent = dynamic(() => import('components/gists/FileContent'));
-const Pagination = dynamic(() => import('components/gists/Pagination'));
+const Pagination = dynamic(() => import('components/RUA/RUAPagination'));
 
 dayjs.extend(relativeTime);
 
 const Gists = ({
   gists,
   user,
+  prev,
+  next,
+  total,
 }: InferGetStaticPropsType<typeof getStaticProps>) => {
   return (
     <>
@@ -25,7 +28,14 @@ const Gists = ({
 
           <div className="flex-1 py-4 overflow-hidden md:pl-8">
             <FileContent gists={gists.gists} />
-            <Pagination pageSize={gists.pageSize} />
+            <Pagination
+              hasPrev={!!prev}
+              hasNext={!!next}
+              prevLink={prev === 1 ? `/gists/` : `/gists/${prev}`}
+              nextLink={`/gists/${next}`}
+              current={prev == null ? next - 1 : prev + 1}
+              total={total}
+            />
           </div>
         </div>
       </main>
@@ -61,6 +71,9 @@ export const getStaticPaths: GetStaticPaths = async () => {
 export const getStaticProps: GetStaticProps<{
   gists: GetGists;
   user: GetUser;
+  prev: number;
+  next: number;
+  total: number;
 }> = async ({ params }) => {
   if (typeof params?.p !== 'string')
     return {
@@ -79,6 +92,9 @@ export const getStaticProps: GetStaticProps<{
     props: {
       gists: result,
       user,
+      prev: Number(result.pageSize.prev),
+      next: Number(result.pageSize.next),
+      total: Number(result.pageSize.last),
     },
     revalidate: 600,
   };
diff --git a/pages/gists/index.tsx b/pages/gists/index.tsx
index 6231960..43f29e3 100644
--- a/pages/gists/index.tsx
+++ b/pages/gists/index.tsx
@@ -15,11 +15,10 @@ dayjs.extend(relativeTime);
 const Gists = ({
   gists,
   user,
+  prev,
+  next,
+  total,
 }: InferGetStaticPropsType<typeof getStaticProps>) => {
-  const prev = Number(gists.pageSize.prev);
-  const next = Number(gists.pageSize.next);
-  const total = Number(gists.pageSize.last);
-
   return (
     <>
       <main className="max-w-5xl px-4 mx-auto lg:px-0">
@@ -46,6 +45,9 @@ const Gists = ({
 export const getStaticProps: GetStaticProps<{
   gists: GetGists;
   user: GetUser;
+  prev: number;
+  next: number;
+  total: number;
 }> = async () => {
   const result = await getGists();
   if (!result)
@@ -59,6 +61,9 @@ export const getStaticProps: GetStaticProps<{
     props: {
       gists: result,
       user,
+      prev: Number(result.pageSize.prev),
+      next: Number(result.pageSize.next),
+      total: Number(result.pageSize.last),
     },
     revalidate: 600,
   };