next/prev page

assets/styles/components/_blog.scss

@@ -201,6 +201,37 @@
         color: #999;
       }
     }
+
+    &__page {
+      display: flex;
+      margin-top: 1.2rem;
+      justify-content: space-between;
+
+      &-link {
+        display: flex;
+        flex-direction: column;
+
+        &--newer {
+          margin-left: auto;
+          text-align: right;
+        }
+
+        &:hover {
+          text-decoration: none;
+
+          .blog-post__page-name {
+            text-decoration: underline;
+          }
+        }
+      }
+
+      &-title {
+        color: #999;
+        line-height: 1em;
+        text-shadow: 0 1px #fff;
+        font-weight: bold;
+      }
+    }
   }
 
   &__sidebar {

components/blog-post.vue

@@ -30,6 +30,26 @@
         </div>
       </div>
     </div>
+
+    <div v-if="detail" class="blog-post__page">
+      <NuxtLink
+        v-if="post.prev"
+        :to="'/blog/' + post.prev.fullSlug"
+        class="blog-post__page-link blog-post__page-link--older"
+      >
+        <span class="blog-post__page-title">Older</span>
+        <span class="blog-post__page-name">{{ post.prev.title }}</span>
+      </NuxtLink>
+
+      <NuxtLink
+        v-if="post.next"
+        :to="'/blog/' + post.next.fullSlug"
+        class="blog-post__page-link blog-post__page-link--newer"
+      >
+        <span class="blog-post__page-title">Newer</span>
+        <span class="blog-post__page-name">{{ post.next.title }}</span>
+      </NuxtLink>
+    </div>
   </article>
 </template>
 

lib/blog/read-posts.ts

@@ -23,38 +23,27 @@ marked.use({
   },
 });
 
-export async function readBlogPosts(
-  condition?: (body: BlogPost) => boolean,
-  render = true,
-  includeContent = true
-) {
+async function readBlogPosts() {
   const files = await fs.readdir(dir);
   const readMD = files.filter((file) => file.endsWith('.md'));
   const readFiles = [];
+
   for (const file of readMD) {
-    const post = await readBlogPost(
-      file.replace('.md', ''),
-      condition,
-      render,
-      includeContent
-    );
+    const post = await readBlogPost(file.replace('.md', ''));
     if (!post) continue;
     readFiles.push(post);
   }
+
   readFiles.sort((a, b) =>
     new Date(b.date)
       .toISOString()
       .localeCompare(new Date(a.date).toISOString(), 'en', { numeric: true })
   );
+
   return readFiles;
 }
 
-export async function readBlogPost(
-  slug: string,
-  condition?: (body: BlogPost) => boolean,
-  render = true,
-  includeContent = true
-): Promise<BlogPost[]> {
+async function readBlogPost(slug: string): Promise<BlogPost[]> {
   const decoded = decodeURIComponent(slug);
   if (!slug || decoded.includes('/') || decoded.includes('.'))
     throw new Error('Invalid post slug');
@@ -64,30 +53,74 @@ export async function readBlogPost(
   const read = await fs.readFile(mdpath, { encoding: 'utf-8' });
 
   const { header: parsedHeader, length: headerLength } = await readHeader(read);
-  const renderedMd = render
-    ? await marked(read.substring(headerLength), { async: true })
-    : undefined;
+  const renderedMd = await marked(read.substring(headerLength), {
+    async: true,
+  });
+
   const { year, month, day } = getDateObject(parsedHeader);
   const content = {
     ...parsedHeader,
     file,
     slug,
     fullSlug: `${year}/${month}/${day}/${slug}`,
-    markdown: includeContent ? read.substring(headerLength) : undefined,
+    markdown: read.substring(headerLength),
     html: renderedMd,
   };
 
-  if (condition) {
-    if (!condition(content)) {
-      return;
-    }
-  }
-
   return content;
 }
 
+let blogPostCache: BlogPost[] = [];
+export const blogPostList = async () => {
+  if (!blogPostCache.length) {
+    blogPostCache = await readBlogPosts();
+  }
+  return blogPostCache;
+};
+
+export const getFilteredBlogPosts = async (
+  condition?: (body: BlogPost) => boolean,
+  htmlContent = true,
+  includeMarkdown = true
+): Promise<BlogPost[]> => {
+  const posts = await blogPostList();
+  return posts
+    .filter((item) => (condition ? condition(item) : true))
+    .map((item) => ({
+      ...item,
+      html: htmlContent ? item.html : undefined,
+      markdown: includeMarkdown ? item.markdown : undefined,
+    }));
+};
+
+export const getBlogPost = async (
+  slug: string,
+  htmlContent = true,
+  includeMarkdown = true
+): Promise<BlogPost> => {
+  const posts = await blogPostList();
+  const item = posts.find((item) => item.slug === slug);
+  if (!item) return;
+
+  const index = posts.indexOf(item);
+  const next = index > 0 ? posts[index - 1] : undefined;
+  const prev = posts[index + 1];
+
+  return {
+    ...item,
+    html: htmlContent ? item.html : undefined,
+    markdown: includeMarkdown ? item.markdown : undefined,
+    next: next
+      ? { title: next.title, slug: next.slug, fullSlug: next.fullSlug }
+      : undefined,
+    prev: prev
+      ? { title: prev.title, slug: prev.slug, fullSlug: prev.fullSlug }
+      : undefined,
+  };
+};
+
 export async function getTags(): Promise<BlogPostTag[]> {
-  const posts = await readBlogPosts(undefined, false, false);
+  const posts = await getFilteredBlogPosts(undefined, false, false);
   const obj: BlogPostTag[] = [];
 
   for (const post of posts) {
@@ -113,7 +146,7 @@ export async function getTags(): Promise<BlogPostTag[]> {
 }
 
 export async function getArchiveTree(condition?: (body: BlogPost) => boolean) {
-  const posts = await readBlogPosts(condition, false, false);
+  const posts = await getFilteredBlogPosts(condition, false, false);
   const obj = {};
 
   for (const post of posts) {

lib/types/post.ts

@@ -7,6 +7,8 @@ export interface BlogPost {
   fullSlug: string;
   markdown: string;
   html: string;
+  next?: Partial<BlogPost>;
+  prev?: Partial<BlogPost>;
 }
 
 export interface BlogPostTag {

server/api/blog/[slug].ts

@@ -1,10 +1,9 @@
-import { H3Error } from 'h3';
-import { readBlogPost } from '~~/lib/blog/read-posts';
+import { getBlogPost } from '~~/lib/blog/read-posts';
 
 export default defineEventHandler(async (event) => {
   const slug = getRouterParam(event, 'slug');
   try {
-    const post = await readBlogPost(slug);
+    const post = await getBlogPost(slug);
     return post;
   } catch (e) {}
 });

server/api/blog/index.ts

@@ -1,4 +1,4 @@
-import { readBlogPosts } from '~~/lib/blog/read-posts';
+import { getFilteredBlogPosts } from '~~/lib/blog/read-posts';
 
 export default defineEventHandler(async (event) => {
   const query = getQuery(event);
@@ -32,7 +32,7 @@ export default defineEventHandler(async (event) => {
     return true;
   };
 
-  const posts = await readBlogPosts(
+  const posts = await getFilteredBlogPosts(
     include,
     query.render !== 'false',
     query.body === 'true'

server/routes/blog/atom.xml.ts

@@ -1,10 +1,10 @@
 import { Feed } from 'feed';
-import { readBlogPosts } from '~~/lib/blog/read-posts';
+import { getFilteredBlogPosts } from '~~/lib/blog/read-posts';
 
 const BASE_URL = 'https://lunasqu.ee/blog';
 
 export default defineEventHandler(async (event) => {
-  const posts = await readBlogPosts(undefined, true, false);
+  const posts = await getFilteredBlogPosts(undefined, true, false);
   const feed = new Feed({
     title: "Evert's Blog",
     description: 'Projects and Tutorials',