Add keybinding infrastructure

keybindings.js

@@ -0,0 +1,50 @@
+import { ReceiptType, Unread } from "/state.js";
+
+export const keybindings = [
+	{
+		key: "h",
+		altKey: true,
+		description: "Mark all messages as read",
+		execute: (app) => {
+			app.setState((state) => {
+				var buffers = new Map();
+				state.buffers.forEach((buf) => {
+					if (buf.messages.length > 0) {
+						var lastMsg = buf.messages[buf.messages.length - 1];
+						app.setReceipt(buf.name, ReceiptType.READ, lastMsg);
+					}
+					buffers.set(buf.name, {
+						...buf,
+						unread: Unread.NONE,
+					});
+				});
+				return { buffers };
+			});
+		},
+	},
+];
+
+export function setup(app) {
+	var byKey = {};
+	keybindings.forEach((binding) => {
+		if (!byKey[binding.key]) {
+			byKey[binding.key] = [];
+		}
+		byKey[binding.key].push(binding);
+	});
+
+	window.addEventListener("keydown", (event) => {
+		var candidates = byKey[event.key];
+		if (!candidates) {
+			return;
+		}
+		candidates = candidates.filter((binding) => {
+			return !!binding.altKey == event.altKey && !!binding.ctrlKey == event.ctrlKey;
+		});
+		if (candidates.length != 1) {
+			return;
+		}
+		event.preventDefault();
+		candidates[0].execute(app);
+	});
+}