Implemented markdown preview

index.js

@@ -1,9 +1,65 @@
 "use strict"
 
+import "dotenv/config"
 import express from "express"
+import got from "got"
+import fsExtra from "fs-extra"
+import prettier from "prettier"
+import handlebars from "handlebars"
+
+const { pathExists, readFile } = fsExtra
+
+const gfm = handlebars.compile(await readFile("./gfm.hbs", "utf8"))
 
 const app = express()
 
+app.get("/github-markdown.css", async (req, res, next) => {
+  try {
+    const path = "./node_modules/github-markdown-css/github-markdown.css"
+    const exists = await pathExists(path)
+    if (exists === false) {
+      return next()
+    }
+    const css = await readFile(path, "utf8")
+    res.setHeader("Content-Type", "text/css")
+    return res.send(css)
+  } catch (error) {
+    console.log(error)
+    return res.sendStatus(500)
+  }
+})
+
+app.get("*.md", async (req, res, next) => {
+  try {
+    const path = `.${req.url}`
+    const exists = await pathExists(path)
+    if (exists === false) {
+      return next()
+    }
+    const markdown = await readFile(path, "utf8")
+    const response = await got.post("https://api.github.com/markdown", {
+      json: {
+        mode: "gfm",
+        text: markdown,
+      },
+    })
+    res.setHeader("Content-Type", "text/html")
+    return res.send(
+      prettier.format(
+        gfm({
+          markdown: response.body,
+        }),
+        {
+          parser: "html",
+        }
+      )
+    )
+  } catch (error) {
+    console.log(error)
+    return res.sendStatus(500)
+  }
+})
+
 app.use(
   express.static(".", {
     dotfiles: "ignore",