Introduce store helper

Responsible for serializing/deserializing data to be saved in
localStorage. Add a prefix to all localStorage entries to avoid
conflicts with other webapps. Stop guarding against localStorage
not existing, browsers can just implement a dumb interface to
disable it.

commands.js

@@ -132,9 +132,6 @@ export default {
 	"quit": {
 		description: "Quit",
 		execute: (app, args) => {
-			if (window.localStorage) {
-				localStorage.removeItem("autoconnect");
-			}
 			app.close({ name: SERVER_BUFFER });
 		},
 	},

components/app.js

@@ -16,6 +16,7 @@ import { strip as stripANSI } from "../lib/ansi.js";
 import { SERVER_BUFFER, BufferType, ReceiptType, NetworkStatus, Unread } from "../state.js";
 import commands from "../commands.js";
 import { setup as setupKeybindings } from "../keybindings.js";
+import * as store from "../store.js";
 
 const configPromise = fetch("../config.json")
 	.then((resp) => {
@@ -193,8 +194,8 @@ export default class App extends Component {
 
 		this.saveReceipts = debounce(this.saveReceipts.bind(this), 500);
 
-		if (window.localStorage && localStorage.getItem("autoconnect")) {
-			var connectParams = JSON.parse(localStorage.getItem("autoconnect"));
+		var connectParams = store.autoconnect.load();
+		if (connectParams) {
 			this.state.connectParams = {
 				...this.state.connectParams,
 				...connectParams,
@@ -202,10 +203,7 @@ export default class App extends Component {
 			};
 		}
 
-		if (window.localStorage && localStorage.getItem("receipts")) {
-			var obj = JSON.parse(localStorage.getItem("receipts"));
-			this.receipts = new Map(Object.entries(obj));
-		}
+		this.receipts = store.receipts.load();
 
 		configPromise.then((config) => {
 			this.handleConfig(config);
@@ -376,10 +374,7 @@ export default class App extends Component {
 	}
 
 	saveReceipts() {
-		if (window.localStorage) {
-			var obj = Object.fromEntries(this.receipts);
-			localStorage.setItem("receipts", JSON.stringify(obj));
-		}
+		store.receipts.put(this.receipts);
 	}
 
 	getReceipt(target, type) {
@@ -808,12 +803,10 @@ export default class App extends Component {
 	handleConnectSubmit(connectParams) {
 		this.setState({ error: null });
 
-		if (window.localStorage) {
-			if (connectParams.autoconnect) {
-				localStorage.setItem("autoconnect", JSON.stringify(connectParams));
-			} else {
-				localStorage.removeItem("autoconnect");
-			}
+		if (connectParams.autoconnect) {
+			store.autoconnect.put(connectParams);
+		} else {
+			store.autoconnect.put(null);
 		}
 
 		this.connect(connectParams);
@@ -887,8 +880,8 @@ export default class App extends Component {
 			}
 
 			// TODO: only clear local storage if this network is stored there
-			if (buf.network == 1 && window.localStorage) {
-				localStorage.removeItem("autoconnect");
+			if (buf.network == 1) {
+				store.autoconnect.put(null);
 			}
 			break;
 		case BufferType.CHANNEL:

components/connect-form.js

@@ -74,17 +74,6 @@ export default class ConnectForm extends Component {
 	}
 
 	render() {
-		var rememberMe = null;
-		if (window.localStorage) {
-			rememberMe = html`
-				<label>
-					<input type="checkbox" name="rememberMe" checked=${this.state.rememberMe} disabled=${this.props.disabled}/>
-					Remember me
-				</label>
-				<br/><br/>
-			`;
-		}
-
 		return html`
 			<form onChange=${this.handleChange} onSubmit=${this.handleSubmit}>
 				<h2>Connect to IRC</h2>
@@ -101,7 +90,11 @@ export default class ConnectForm extends Component {
 				</label>
 				<br/><br/>
 
-				${rememberMe}
+				<label>
+					<input type="checkbox" name="rememberMe" checked=${this.state.rememberMe} disabled=${this.props.disabled}/>
+					Remember me
+				</label>
+				<br/><br/>
 
 				<details>
 					<summary>Advanced options</summary>

store.js

@@ -0,0 +1,46 @@
+const PREFIX = "gamja_";
+
+function getItem(k) {
+	k = PREFIX + k;
+
+}
+
+function setItem(k, v) {
+	k = PREFIX + k;
+}
+
+class Item {
+	constructor(k) {
+		this.k = PREFIX + k;
+	}
+
+	load() {
+		var v = localStorage.getItem(this.k);
+		if (!v) {
+			return null;
+		}
+		return JSON.parse(v);
+	}
+
+	put(v) {
+		if (v) {
+			localStorage.setItem(this.k, JSON.stringify(v));
+		} else {
+			localStorage.removeItem(this.k);
+		}
+	}
+}
+
+export const autoconnect = new Item("autoconnect");
+
+const rawReceipts = new Item("receipts");
+
+export const receipts = {
+	load() {
+		var v = rawReceipts.load();
+		return new Map(Object.entries(v || {}));
+	},
+	put(m) {
+		rawReceipts.put(Object.fromEntries(m));
+	},
+};