Add a command line interface to nextstep-plist

index.js

@@ -1,4 +1,54 @@
+#!/usr/bin/env node
+let parse = require("./code/parse")
+let stringify = require("./code/stringify")
+
 module.exports = {
-  parse: require('./code/parse'),
-  stringify: require('./code/stringify')
+	parse,
+	stringify,
 }
+
+async function getStdin() {
+	return new Promise((honour, betray) => {
+		let result = ""
+
+		process.stdin.on("data", function(chunk) {
+			result += chunk
+		})
+
+		process.stdin.on("end", () => honour(result))
+
+		process.stdin.on("error", betray)
+	})
+}
+
+let help = `
+commands:
+	to-json	— take stdin as a plist and output JSON
+	to-plist	— take stdin as JSON and output plist
+`
+
+;(async function monkey() {
+	if (!module.parent) {
+    let {EOL} = require("os")
+		switch (process.argv[2]) {
+			case "to-json": {
+				let input = await getStdin()
+				let object = parse(input)
+				let output = JSON.stringify(object, null, "\t")
+				return process.stdout.write(output + EOL)
+			}
+			case "to-plist": {
+				let input = await getStdin()
+				let object = JSON.parse(input)
+				let output = stringify(object)
+				return process.stdout.write(output + EOL)
+			}
+			default: {
+				process.stdout.write(help)
+				return process.exit(1)
+			}
+		}
+	}
+})().catch(error => {
+  console.error(process.env.debug ? error : error.message)
+})