rename frontend directory

frontend/src/ui.js

@@ -0,0 +1,66 @@
+// Global utility functions related with UI functionality
+
+import router from './router'
+
+export function goto (path) {
+    router.push(path);
+}
+
+export async function confirm (prompt) {
+    return window.confirm(prompt);
+}
+
+export async function input (prompt) {
+    return window.prompt(prompt);
+}
+
+export async function inputFile (options) {
+    console.log("app.inputFile", options);
+    throw new Error("Cannot open files");
+}
+
+export function alert (message) {
+    emit('alert', {message});
+}
+
+export function editValue (mode, value, callback) {
+    emit('edit-value', {mode, value, callback});
+}
+
+export function contextMenu (entries) {
+    return new Promise(resolve => {
+        emit('context-menu', {entries, callback: resolve});
+    });
+}
+
+
+// === Events === //
+
+const listeners = {};
+
+export function emit (name, ...args) {
+    const fs = listeners[name];
+    if (fs == null) return;
+
+    for (let f of fs) {
+        f(...args);
+    }
+}
+
+export function listen (name, fn) {
+    let fs = listeners[name];
+    if (fs == null) {
+        listeners[name] = fs = [];
+    }
+
+    fs.push(fn);
+}
+
+export function invoke (name, ...args) {
+    throw new Error("invoke");
+}
+
+window.addEventListener("unhandledrejection", function(promiseRejectionEvent) { 
+    console.error(promiseRejectionEvent.reason);
+    alert("Unhandled Error: " + String(promiseRejectionEvent.reason));
+});