Display leap day anniversaries every year on calendars

Added a new anniversary method to dates which returns a day and
month on which to display leap day anniversaries on non-leap
years.

Added an option in the preferences display tab which allows the
user to specify on which day the anniversary should be displayed.
The options are: 28th Feb, 1st Mar or only on 29th Feb.

Fixes #12511

gramps/gen/config.py

@@ -250,6 +250,7 @@ register('preferences.quick-backup-include-mode', False)
 register('preferences.date-format', 0)
 register('preferences.calendar-format-report', 0)
 register('preferences.calendar-format-input', 0)
+register('preferences.february-29', 0)  # 0: 02/28; 1: 03/01; 2: only the 02/29
 register('preferences.cprefix', 'C%04d')
 register('preferences.default-source', False)
 register('preferences.tag-on-import', False)

gramps/gen/lib/date.py

@@ -30,6 +30,7 @@
 #
 # ------------------------------------------------------------------------
 import logging
+import calendar
 
 # -------------------------------------------------------------------------
 #
@@ -2064,6 +2065,24 @@ class Date:
         self.dateval = tuple(dlist)
         self._calc_sort_value()
 
+    def anniversary(self, year):
+        """
+        If the date is February 29, you must choose the day to view it in the
+        event of a non-leap year.
+        This is usualy used in calendars.
+        """
+        month = self.dateval[Date._POS_MON]
+        day = self.dateval[Date._POS_DAY]
+        if month == 2 and day == 29 and not calendar.isleap(year):
+            day_show = config.get('preferences.february-29')
+            if day_show == 0:
+                day = 28
+            elif day_show == 1:
+                month = 3
+                day = 1
+            # else:  # In all other cases, keep the february 29 day
+        return (month, day)
+
     year = property(get_year, set_year)
 
 

gramps/gen/lib/test/date_test.py

@@ -1232,6 +1232,41 @@ class EmptyDateTest(BaseDateTest):
         d.set(value=(1, 1, 1900, False, 1, 1, 1910, False), modifier=Date.MOD_SPAN)
         self.assertFalse(d.is_empty())
 
+# -------------------------------------------------------------------------
+#
+# AnniversaryDateTest
+#
+# -------------------------------------------------------------------------
+class AnniversaryDateTest(BaseDateTest):
+    """
+    Tests for leap day anniversary dates.
+    """
+
+    def test_leapyear_1(self):
+        config.set('preferences.february-29', 0)
+        d = Date(1904, 2, 29)
+        self.assertEqual(d.anniversary(1908), (2, 29))
+
+    def test_leapyear_2(self):
+        config.set('preferences.february-29', 1)
+        d = Date(1904, 2, 29)
+        self.assertEqual(d.anniversary(1908), (2, 29))
+
+    def test_nonleapyear_before(self):
+        config.set('preferences.february-29', 0)
+        d = Date(1904, 2, 29)
+        self.assertEqual(d.anniversary(1910), (2, 28))
+
+    def test_nonleapyear_after(self):
+        config.set('preferences.february-29', 1)
+        d = Date(1904, 2, 29)
+        self.assertEqual(d.anniversary(1910), (3, 1))
+
+    def test_nonleapyear_keep(self):
+        config.set('preferences.february-29', 2)
+        d = Date(1904, 2, 29)
+        self.assertEqual(d.anniversary(1910), (2, 29))
+
 
 if __name__ == "__main__":
     unittest.main()

gramps/gui/configure.py

@@ -1386,6 +1386,23 @@ class GrampsPreferences(ConfigureDialog):
         grid.attach(lwidget, 1, row, 1, 1)
         grid.attach(obox, 2, row, 2, 1)
 
+        row += 1
+        # Birthday on february 29
+        feb29 = Gtk.ComboBoxText()
+        show_on = [_("on the previous day"),
+                   _("on the next day"),
+                   _("only on leap years")]
+        list(map(feb29.append_text, show_on))
+        active = config.get('preferences.february-29')
+        feb29.set_active(active)
+        feb29.connect('changed', self.date_february_29_display_on)
+        ttip = _("For non leap years, anniversaries are displayed on either "
+                 "February 28, March 1 or not at all in Gregorian calendars")
+        feb29.set_tooltip_text(ttip)
+        lwidget = BasicLabel(_("Show leap day anniversaries"))
+        grid.attach(lwidget, 1, row, 1, 1)
+        grid.attach(feb29, 2, row, 2, 1)
+
         row += 1
         # Status bar:
         obox = Gtk.ComboBoxText()
@@ -1572,6 +1589,12 @@ class GrampsPreferences(ConfigureDialog):
         """
         config.set('preferences.calendar-format-input', obj.get_active())
 
+    def date_february_29_display_on(self, obj):
+        """
+        Save "February 29 display on " option.
+        """
+        config.set('preferences.february-29', obj.get_active())
+
     def autobackup_changed(self, obj):
         """
         Save "Autobackup" option on change.

gramps/plugins/drawreport/calendarreport.py

@@ -28,6 +28,7 @@
 import datetime
 import time
 from functools import partial
+import calendar
 
 #------------------------------------------------------------------------
 #
@@ -374,6 +375,7 @@ class Calendar(Report):
             day = birth_date.get_day()
 
             prob_alive_date = Date(self.year, month, day)
+            month, day = birth_date.anniversary(self.year)
 
             nyears = self.year - year
             short_name = self.get_name(

gramps/plugins/textreport/birthdayreport.py

@@ -27,6 +27,7 @@
 #
 #------------------------------------------------------------------------
 import datetime, time
+import calendar
 
 #------------------------------------------------------------------------
 #
@@ -37,8 +38,9 @@ from gramps.gen.const import GRAMPS_LOCALE as glocale
 _ = glocale.translation.gettext
 from gramps.gen.const import URL_HOMEPAGE
 from gramps.gen.errors import ReportError
+from gramps.gen.config import config
 from gramps.gen.lib import NameType, EventType, Name, Date, Person, Surname
-from gramps.gen.lib.date import gregorian
+from gramps.gen.lib.date import gregorian, Today
 from gramps.gen.relationship import get_relationship_calculator
 from gramps.gen.plug.docgen import (FontStyle, ParagraphStyle, GraphicsStyle,
                                     FONT_SERIF, PARA_ALIGN_RIGHT,
@@ -291,7 +293,7 @@ class BirthdayReport(Report):
                     day = birth_date.get_day()
 
                     prob_alive_date = Date(self.year, month, day)
-
+                    month, day = birth_date.anniversary(self.year)
                     nyears = self.year - year
                     # add some things to handle maiden name:
                     father_lastname = None # husband, actually

gramps/plugins/webreport/calendar.py

@@ -968,7 +968,7 @@ class CalendarPage(BasePage):
                     # current year of calendar, month nd day is their birth
                     # month and birth day
                     prob_alive_date = Date(this_year, month, day)
-
+                    month, day = birth_date.anniversary(this_year)
                     # add some things to handle maiden name:
                     father_surname = None # husband, actually
                     if person.gender == Person.FEMALE:
@@ -1093,6 +1093,7 @@ class CalendarPage(BasePage):
                                     month = event_date.get_month()
                                     day = event_date.get_day()
 
+                                    month, day = event_date.anniversary(this_year)
                                     # date to figure if someone is still alive
                                     prob_alive_date = Date(this_year,
                                                            month, day)

gramps/plugins/webreport/webcal.py

@@ -1370,7 +1370,7 @@ return false;
                     # current year of calendar, month nd day is their birth
                     # month and birth day
                     prob_alive_date = Date(this_year, month, day)
-
+                    month, day = birth_date.anniversary(this_year)
                     # add some things to handle maiden name:
                     father_surname = None # husband, actually
                     if person.gender == Person.FEMALE: