add markdown rendering, copy in old posts

1 files changed, 56 insertions, 0 deletions

diff --git a/utils/post.ts b/utils/post.ts
new file mode 100644
index 0000000..b2dd328
--- /dev/null
+++ b/utils/post.ts
@@ -0,0 +1,56 @@
+import { promises as fs } from 'fs'
+import path from 'path'
+
+import frontmatter from 'front-matter'
+
+export interface Post {
+  slug: string,
+  date: Date,
+  title: string,
+  subtitle?: string,
+  author: string,
+  body: string
+}
+
+const POST_FILE_PATTERN = /^(?<date>[0-9]{4}-[0-9]{2}-[0-9]{2}(-[0-9]{1,2})?)_(?<slug>[^\.]+)\.md$/
+
+export async function getPostSlugs(): Promise<string[]> {
+  const postsDir = path.join(process.cwd(), 'posts')
+  const postPaths = await fs.readdir(postsDir)
+  return postPaths.map(getSlugFromFilePath).filter(slug => slug !== null)
+}
+
+export function getSlugFromFilePath(postPath: string): string | null {
+  const regexResult = POST_FILE_PATTERN.exec(postPath)
+  if (!regexResult) return null
+  return regexResult.groups.slug
+}
+
+export async function loadSinglePage(slug: string): Promise<Post | null> {
+  const postsDir = path.join(process.cwd(), 'posts')
+  const postPaths = await fs.readdir(postsDir)
+  const postMatch: RegExpExecArray | null = postPaths
+    .map((postFile: string) => POST_FILE_PATTERN.exec(postFile))
+    .filter((regexResult: RegExpExecArray | null) => regexResult !== null)
+    .find((regexResult: RegExpExecArray) => regexResult.groups.slug === slug)
+
+  if (!postMatch) return null;
+
+  const fileName = `${postMatch.groups.date}_${postMatch.groups.slug}.md`
+  const fileContents = (await fs.readFile(path.join(process.cwd(), 'posts', fileName))).toString('utf8')
+  const { attributes, body } = frontmatter(fileContents)
+
+  type Attributes = { [key: string]: string }
+  const data: Attributes = attributes as Attributes
+
+  if (!data.title) return null;
+
+  return {
+    slug: postMatch.groups.slug,
+    date: new Date(postMatch.groups.date),
+    title: data.title,
+    subtitle: data.subtitle,
+    author: data.author,
+    body
+  }
+}