fix: ics calendar export dates (#535)

* feat: academicCalendars object

* feat: seemingly working start, end, and until dates

* feat: seemingly working everything

* style: removed unnecessary deps, reorganized code

* style: code comments yay

* chore: old version of pnpm?

* ci: force github actions to rerun

* feat: list instructors in ics string, basic tests

* feat: testable code for ICS, tests for ICS, filter excluded dates

* style: eslint autofix

* test: check for graceful handling of errors in ICS

* fix: actually use scheduleToIcsString

* chore: eslint didn't include a space where it should've

* fix: ensure tz everywhere

* refactor: move string util to string util file

* feat: em dash in calendar event title

* feat: academic calendars 22-23 and 23-24

* fix: en dash instead of em dash

src/shared/util/string.ts

@@ -48,3 +48,22 @@ export const ellipsify = (input: string, chars: number): string => {
     }
     return ellipisifed;
 };
+
+/**
+ *  Stringifies a list of items in English format.
+ *
+ * @param items - The list of items to stringify.
+ * @returns A string representation of the list in English format.
+ * @example
+ * englishStringifyList([]) // ''
+ * englishStringifyList(['Alice']) // 'Alice'
+ * englishStringifyList(['Alice', 'Bob']) // 'Alice and Bob'
+ * englishStringifyList(['Alice', 'Bob', 'Charlie']) // 'Alice, Bob, and Charlie'
+ */
+export const englishStringifyList = (items: readonly string[]): string => {
+    if (items.length === 0) return '';
+    if (items.length === 1) return items[0]!;
+    if (items.length === 2) return `${items[0]} and ${items[1]}`;
+
+    return `${items.slice(0, -1).join(', ')}, and ${items.at(-1)}`;
+};