Add info dialog

src/utils.ts

@@ -46,3 +46,20 @@ export function torrentIsState(type: StateType, state: string) {
 export function sleep(ms: number) {
   return new Promise((resolve) => setTimeout(resolve, ms));
 }
+
+export function codeToFlag(code: string) {
+  const magicNumber = 0x1F1A5;
+
+  code = code.toUpperCase();
+  const codePoints = [...code].map((c) => magicNumber + c.charCodeAt(0));
+  const char = String.fromCodePoint(...codePoints);
+  const url = 'https://cdn.jsdelivr.net/npm/twemoji/2/svg/' +
+    `${codePoints[0].toString(16)}-${codePoints[1].toString(16)}.svg`;
+
+  return {
+    char,
+    url,
+  };
+}
+
+export const isWindows = navigator.userAgent.includes('Windows');