Added ConvoStorage.

index.js

@@ -2,5 +2,6 @@
 const { Convo } = require('./src/convo');
 const { ConvoApp } = require('./src/convo-app');
 const { Say } = require('./src/say');
+const { ConvoStorage } = require('./src/convo-storage');
 
-module.exports = { Convo, ConvoApp, Say };
+module.exports = { Convo, ConvoApp, Say, ConvoStorage };

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@tmtek/convo",
-  "version": "0.1.9",
+  "version": "0.1.10",
   "description": "A uility for building conversational responses in DialogFlow fufillments",
   "main": "index.js",
   "scripts": {

readme.md

@@ -177,6 +177,20 @@ convo.getFromStorage("list"); //returns ["one","two","three"]
 
 `onStorageUpdated()` and `setStorage()` are useful when testing your application outside of DialogFlow, because you can use those methods to simulate persisted data, or actually persist it yourself.
 
+#### ConvoStorage
+
+There is a utility included with Convo that you can use to create a Convo object that has it's storage populated from a json file and will also write any changes made to storage to that file:
+
+```javascript
+const {ConvoStorage} = require('@tmtek/convo');
+
+new ConvoStorage("storage.json").load(storageConvo => {
+	new YourApp().intent(storageConvo, 'welcome', null, null, {log:true});
+});
+```
+
+The ConvoStorage class allows you to specify a json file to load your data from. Then you call `load(convo=> {})` to get a Convo object generated for that storage data. If your application uses `setToStorage()` thereafter, the data will be automatically saved to that json file.
+
 
 
 ## API Reference

src/convo-storage.js

@@ -0,0 +1,34 @@
+const fs = require('fs');
+const {Convo} = require('./convo');
+
+class ConvoStorage {
+	constructor(filename) {
+		this._filename = filename;
+	}
+
+	load(callback) {
+		new Promise((resolve, reject) => {
+			if (!this._filename) {
+				resolve({});
+				return;
+			}
+			fs.readFile(this._filename, 'utf8', (error, data) => {
+				!error ? resolve(JSON.parse(data)) : resolve({})
+			})
+		})
+		.then(data => callback(
+			new Convo()
+				.setStorage(data)
+				.onStorageUpdated(this.write)
+		));
+	}
+
+	write(storage) {
+		if(!this._filename) {
+			return;
+		}
+		fs.writeFile(this._filename, JSON.stringify(storage, null, 2), error => {})
+	}
+}
+
+module.exports = {ConvoStorage}