case insensitive selector, remove diacritics from selector name

index.js

@@ -67,15 +67,29 @@ app.get('/listVoices', (req, res, next) => {
 			}
 		}
 		let selectorMap = {};
+		const removeDiacritics = s => s.normalize('NFD').replace(/\p{Diacritic}/gu, '');
+		const getSelector = (name, id, provider) => {
+			let nameClean = removeDiacritics(name.toLowerCase());
+			if(!(nameClean in selectorMap)) {
+				selectorMap[nameClean] = true;
+				return removeDiacritics(name);
+			}
+			let idClean = id.toLowerCase().normalize('NFD').replace(/\p{Diacritic}/gu, '');
+			if(!(idClean in selectorMap)) {
+				selectorMap[idClean] = true;
+				return id;
+			}
+			let providerClean = provider.toLowerCase().normalize('NFD').replace(/\p{Diacritic}/gu, '');
+			selectorMap[`${providerClean}|${idClean}`] = true;
+			return `${provider}|${id}`;
+		};
 		for(let v of ret) {
-			v.selector = (v.name in selectorMap) ? ((v.id in selectorMap) ? `${v.provider}|${v.id}` : v.id) : v.name;
-			selectorMap[v.selector] = true;
+			v.selector = getSelector(v.name, v.id, v.provider);
 			if(v.alternatives) {
 				v.alternatives[0].selector = v.selector;
 				for(let i = 1; i < v.alternatives.length; i++) {
 					let a = v.alternatives[i];
-					a.selector = (a.name in selectorMap) ? ((a.id in selectorMap) ? `${a.provider}|${a.id}` : a.id) : a.name;
-					selectorMap[a.selector] = true;
+					a.selector = getSelector(a.name, a.id, a.provider);
 				}
 			}
 		}