Minor fixes.

README.md

@@ -23,7 +23,7 @@ This is a cross-platform command line tool for bulk generating student and teach
 This file is required to configure:
 
 * Daily **`timings`**, which can be customised for specific `days` and/or `yearGroups`
-* Year group **`absences`** (e.g. for study leave or staggered start days)
+* Year group **`absences`** (e.g. for study leave or a staggered start of term)
 * Period **`overrides`** (e.g. whole-school tutorials or early finishes)
 * Lesson **`renames`**
 
@@ -46,7 +46,7 @@ This file is required to configure:
   ],
   "overrides":
   [
-    { "date": "2021-09-02", "period": "1", "yearGroups": [8, 9, 10, 12], "title": "" }
+    { "date": "2021-09-02", "period": "1", "yearGroups": [8, 9, 10, 12], "title": "" },
     { "date": "2021-12-17", "period": "4", "title": "Whole school assembly" },
     { "date": "2021-12-17", "period": "5", "title": "" }
   ],
@@ -116,7 +116,7 @@ To create this file in SIMS:
 
 #### google-key.json
 
-If you are using the `--google` flag to directly upload timetables to Google Calendar, your domain administrator will need to create a free service account key:
+If you are using the `--google` flag to directly sync timetables to Google Calendar, your domain administrator will need to create a free service account key:
 
 1. [Create a new project](https://console.cloud.google.com/projectcreate) on the Google Cloud Platform console.
 1. [Enable the Google Calendar API.](https://console.cloud.google.com/apis/library/calendar-json.googleapis.com) Depending on the size of your school, you may also need to apply for a raised quota. The tool may use up to 1000 API requests per user when it is first run.
@@ -134,7 +134,7 @@ If you are using the `--google` flag to directly upload timetables to Google Cal
 
 #### microsoft-key.json
 
-This file is required if you are using the `--microsoft` flag to directly upload timetables to Microsoft 365.
+This file is required if you are using the `--microsoft` flag to directly sync timetables to Microsoft 365.
 
 ```
 {

src/CalendarGenerator.cs

@@ -26,7 +26,7 @@ public IList<CalendarEvent> Generate(Person person)
           var period = periodTimings.Key;
 
           myLessons.TryGetValue($"{dayCode}:{period}", out var lesson);
-          var yearGroup = person.YearGroup ?? lesson?.YearGroup ?? default;
+          var yearGroup = person.YearGroup ?? lesson?.YearGroup;
 
           var overridePeriod = Settings.Overrides.FirstOrDefault(o => o.Date == date && o.Period == period && (o.YearGroups?.Contains(yearGroup) ?? true));
 
@@ -40,7 +40,7 @@ public IList<CalendarEvent> Generate(Person person)
           }
           else if (lesson is not null)
           {
-            if (Settings.Absences.Any(o => o.YearGroups.Contains(yearGroup) && o.StartDate <= date && o.EndDate >= date)) continue;
+            if (yearGroup is not null && Settings.Absences.Any(o => o.YearGroups.Contains(yearGroup.Value) && o.StartDate <= date && o.EndDate >= date)) continue;
 
             var clsName = lesson.Class;
             if (Settings.RenameDictionary.TryGetValue(clsName, out var newTitle))

src/InputReader.cs

@@ -207,7 +207,7 @@ private static async Task<IEnumerable<Person>> LoadTeachersAsync()
 
     private static int? GetYearFromClassName(string className)
     {
-      var yearDigits = className.TakeWhile(char.IsDigit).ToArray();
+      var yearDigits = className.TakeWhile(c => c >= '0' && c <= '9').ToArray();
       return yearDigits.Length == 0 ? null : int.Parse(new string(yearDigits));
     }
 

src/Settings.cs

@@ -42,7 +42,7 @@ public class Override
     public DateTime Date { get; set; }
     public string Period { get; set; }
     public string Title { get; set; }
-    public IList<int> YearGroups { get; set; }
+    public IList<int?> YearGroups { get; set; }
   }
 
   public class Rename
@@ -55,7 +55,7 @@ public class Timing
   {
     public string Period { get; set; }
     public int Duration { get; set; }
-    public IList<int> YearGroups { get; set; }
+    public IList<int?> YearGroups { get; set; }
     public IList<string> Days { get; set; }
 
     public string StartTime