fix: DisabledDate should block today (#73)

* fix disabled today

* test case

* add aria mark

Author: zombieJ

src/PickerPanel.tsx

@@ -459,11 +459,17 @@ function PickerPanel<DateType>(props: PickerPanelProps<DateType>) {
   let todayNode: React.ReactNode;
 
   if (showToday && mergedMode === 'date' && picker === 'date' && !showTime) {
+    const now = generateConfig.getNow();
+    const todayCls = `${prefixCls}-today-btn`;
+    const disabled = disabledDate && disabledDate(now);
     todayNode = (
       <a
-        className={`${prefixCls}-today-btn`}
+        className={classNames(todayCls, disabled && `${todayCls}-disabled`)}
+        aria-disabled={disabled}
         onClick={() => {
-          triggerSelect(generateConfig.getNow(), 'mouse', true);
+          if (!disabled) {
+            triggerSelect(now, 'mouse', true);
+          }
         }}
       >
         {locale.today}

tests/picker.spec.tsx

@@ -467,6 +467,19 @@ describe('Picker.Basic', () => {
       expect(isSame(onSelect.mock.calls[0][0], '1990-09-03')).toBeTruthy();
     });
 
+    it('disabled when in disabledDate', () => {
+      const onSelect = jest.fn();
+      const wrapper = mount(
+        <MomentPicker onSelect={onSelect} disabledDate={() => true} showToday />,
+      );
+      wrapper.openPicker();
+      expect(
+        wrapper.find('.rc-picker-today-btn').hasClass('rc-picker-today-btn-disabled'),
+      ).toBeTruthy();
+      wrapper.find('.rc-picker-today-btn').simulate('click');
+      expect(onSelect).not.toHaveBeenCalled();
+    });
+
     ['decade', 'year', 'quarter', 'month', 'week'].forEach(name => {
       it(`not works on ${name}`, () => {
         const wrapper = mount(<MomentPicker picker={name as any} showToday />);