feat(material-luxon-adapter): add option to set first day of week (#2…

…4027)

* feat(material-luxon-adapter): add option to set first day of week

Add firstDayOfWeek option to be able to change first day of week behaviour through MAT_LUXON_DATE_ADAPTER_OPTIONS

* test(material-luxon-adapter): Added one more test to trigger CI

src/material-luxon-adapter/adapter/luxon-date-adapter.spec.ts

@@ -99,6 +99,25 @@ describe('LuxonDateAdapter', () => {
     ]);
   });
 
+  it('should get month names in a czech locale', () => {
+    adapter.setLocale('cs-CZ');
+
+    expect(adapter.getMonthNames('long')).toEqual([
+      'leden',
+      'únor',
+      'březen',
+      'duben',
+      'květen',
+      'červen',
+      'červenec',
+      'srpen',
+      'září',
+      'říjen',
+      'listopad',
+      'prosinec',
+    ]);
+  });
+
   it('should get month names in a different locale', () => {
     adapter.setLocale('da-DK');
 
@@ -575,7 +594,7 @@ describe('LuxonDateAdapter with MAT_LUXON_DATE_ADAPTER_OPTIONS override', () =>
         providers: [
           {
             provide: MAT_LUXON_DATE_ADAPTER_OPTIONS,
-            useValue: {useUtc: true},
+            useValue: {useUtc: true, firstDayOfWeek: 1},
           },
         ],
       }).compileComponents();
@@ -590,6 +609,10 @@ describe('LuxonDateAdapter with MAT_LUXON_DATE_ADAPTER_OPTIONS override', () =>
       expect(adapter.createDate(2017, 0, 5).toISO()).toBe(DateTime.utc(2017, JAN, 5).toISO());
     });
 
+    it('should get first day of week', () => {
+      expect(adapter.getFirstDayOfWeek()).toBe(1);
+    });
+
     it('should create today in UTC', () => {
       const today = adapter.today();
       expect(today.toISO()).toBe(today.toUTC().toISO());

src/material-luxon-adapter/adapter/luxon-date-adapter.ts

@@ -22,6 +22,13 @@ export interface MatLuxonDateAdapterOptions {
    * {@default false}
    */
   useUtc: boolean;
+
+  /**
+   * Sets the first day of week.
+   * Changing this will change how Angular Material components like DatePicker shows start of week.
+   * {@default 0}
+   */
+  firstDayOfWeek: number;
 }
 
 /** InjectionToken for LuxonDateAdapter to configure options. */
@@ -37,6 +44,7 @@ export const MAT_LUXON_DATE_ADAPTER_OPTIONS = new InjectionToken<MatLuxonDateAda
 export function MAT_LUXON_DATE_ADAPTER_OPTIONS_FACTORY(): MatLuxonDateAdapterOptions {
   return {
     useUtc: false,
+    firstDayOfWeek: 0,
   };
 }
 
@@ -53,6 +61,7 @@ function range<T>(length: number, valueFunction: (index: number) => T): T[] {
 @Injectable()
 export class LuxonDateAdapter extends DateAdapter<LuxonDateTime> {
   private _useUTC: boolean;
+  private _firstDayOfWeek: number;
 
   constructor(
     @Optional() @Inject(MAT_DATE_LOCALE) dateLocale: string,
@@ -62,6 +71,7 @@ export class LuxonDateAdapter extends DateAdapter<LuxonDateTime> {
   ) {
     super();
     this._useUTC = !!options?.useUtc;
+    this._firstDayOfWeek = options?.firstDayOfWeek || 0;
     this.setLocale(dateLocale || LuxonDateTime.local().locale);
   }
 
@@ -109,8 +119,7 @@ export class LuxonDateAdapter extends DateAdapter<LuxonDateTime> {
   }
 
   getFirstDayOfWeek(): number {
-    // To customize the first day of the week, and can extend this adapter and override this method.
-    return 0;
+    return this._firstDayOfWeek;
   }
 
   getNumDaysInMonth(date: LuxonDateTime): number {