General settings (#28)

adding ui for general settings | adding 'working hours' as new feature

lib/utils.js

@@ -8,4 +8,29 @@ function isOneOf(word, arr) {
   return blacklist.test(word);
 }
 
-module.exports = { isOneOf };
+function nullOrEmpty(val) {
+  return val == null || val.length === 0;
+}
+
+function timeStringToMs(timeString, now) {
+  const d = new Date(now);
+  const parts = timeString.split(':');
+  d.setHours(parts[0]);
+  d.setMinutes(parts[1]);
+  d.setSeconds(0);
+  return d.getTime();
+}
+
+function duringWorkingHoursOrNotSet(config, now) {
+  const { workingHours } = config;
+  if (workingHours == null || nullOrEmpty(workingHours.from) || nullOrEmpty(workingHours.to)) {
+    return true;
+  }
+
+  const toDate = timeStringToMs(workingHours.to, now);
+  const fromDate = timeStringToMs(workingHours.from, now);
+
+  return fromDate <= now && toDate >= now;
+}
+
+module.exports = { isOneOf, nullOrEmpty, duringWorkingHoursOrNotSet };