Create reloadOnChanges.js (#144)

* Create reloadOnChanges.js

* improvements

* Update reloadOnChanges.js

* Update reloadOnChanges.js

* use for-of instead of for-in 🐺

* typo

* add license header

* add explanation/disclaimer

* oops

* another typo, shouldve used vsc

tasks/reloadOnChanges.js

@@ -0,0 +1,71 @@
+// Copyright (c) 2017-2019 dirigeants. All rights reserved. MIT license.
+const { Task, Stopwatch } = require('klasa');
+const { watch } = require('chokidar');
+const { extname, basename, sep } = require('path');
+
+const nodeModules = `${sep}node_modules${sep}`;
+
+/*
+* When any piece file is changed in your bot (e.g. when you `git pull`, or just edit a file),
+* this piece will automatically reload that piece so the change is instantly updated into
+* your bot. Test this piece on a test bot before using it in production.
+*/
+
+module.exports = class extends Task {
+
+	async run(name, _path, piece) {
+		const timer = new Stopwatch();
+
+		for (const module of Object.keys(require.cache)) {
+			if (!module.includes(nodeModules) && extname(module) !== '.node') {
+				delete require.cache[module];
+			}
+		}
+
+		let log;
+		const reload = this.client.commands.get('reload');
+		if (piece) {
+			await reload.run({ sendLocale: () => null, sendMessage: () => null }, [piece]);
+			log = `Reloaded it in ${timer}`;
+		} else {
+			await reload.everything({ sendLocale: () => null, sendMessage: () => null });
+			log = `Reloaded everything in ${timer}.`;
+		}
+
+		timer.stop();
+		return this.client.emit('log', `${name} was updated. ${log}`);
+	}
+
+	async init() {
+		if (this.client._fileChangeWatcher) return;
+
+		this.client._fileChangeWatcher = watch(process.cwd(), {
+			ignored: [
+				'**/node_modules/**/*',
+				'**/bwd/provider/**/*'
+			],
+			persistent: true,
+			ignoreInitial: true,
+			cwd: process.cwd()
+		});
+
+		const reloadStore = (_path) => {
+			const store = _path.split(sep)
+				.find(dir => this.client.pieceStores.has(dir));
+
+			const name = basename(_path);
+
+			if (!store) return this.run(name, _path);
+
+			const piece = this.client.pieceStores.get(store)
+				.get(name.replace(extname(name), ''));
+
+			return this.run(name, _path, piece);
+		};
+
+		for (const event of ['add', 'change', 'unlink']) {
+			this.client._fileChangeWatcher.on(event, reloadStore);
+		}
+	}
+
+};