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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
}
}
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