Implemented markdown preview

tasks/preview-markdown.js

@@ -0,0 +1,18 @@
+"use strict"
+
+import "dotenv/config"
+import open from "open"
+
+if (process.argv.length < 3 || !process.argv[2].match(/\.md$/)) {
+  console.info("Usage: node open-preview.js file")
+  process.exit(1)
+}
+
+const file = process.argv[2]
+const options = process.argv[3]
+
+if (options === "use-proxy") {
+  open(`${process.env.LOCALHOST_PROXY}/${file}`)
+} else {
+  open(`http://localhost:${process.env.PORT ?? 8080}/${file}`)
+}