config: new field 'holidays_info' to show generated holidays in config-form

config.py

@@ -9,6 +9,9 @@ from dateutil.easter import (
     easter, EASTER_JULIAN, EASTER_ORTHODOX, EASTER_WESTERN)
 from trytond.pool import PoolMeta, Pool
 from trytond.model import fields
+from trytond.transaction import Transaction
+from trytond.report import Report
+
 
 holidays = fields.Char(
     string='Holidays', help='Semicolon separate list of dates: ' +
@@ -21,6 +24,32 @@ class Configuration(metaclass=PoolMeta):
     __name__ = 'cashbook.configuration'
 
     holidays = fields.MultiValue(holidays)
+    holidays_info = fields.Function(fields.Char(
+        string='Holidays', readonly=True,
+        help='Holidays in the current year.'), 'on_change_with_holidays_info')
+
+    @fields.depends('holidays')
+    def on_change_with_holidays_info(self, name=None):
+        """ get string of generated holidays for years in
+        context-value 'holiday_years' or current year
+
+        Args:
+            name (str, optional): field. Defaults to None.
+
+        Returns:
+            str: formatted holidays in language of user
+        """
+        pool = Pool()
+        Config = pool.get('cashbook.configuration')
+        context = Transaction().context
+
+        years = context.get('holiday_years', [])
+        cfg1 = Config.get_singleton()
+        if cfg1:
+            dates = cfg1.holiday_dates(years)
+            dates.sort()
+            return '|'.join([
+                Report.format_date(x) for x in dates])
 
     def holiday_dates(self, years=[]):
         """ get list of dates for list of years

locale/de.po

@@ -94,6 +94,14 @@ msgctxt "help:cashbook.configuration,holidays:"
 msgid "Semicolon separate list of dates: yyyy-mm-dd = single date, mm-dd = annual repetition, easter[greg|jul|orth] = Easter Sunday, ascension = Ascension Day, whitsun = Whitsunday, offset with :+/-n e.g.: easter:+1 = Easter Monday"
 msgstr "Semikolon getrennte Liste von Datumswerten: yyyy-mm-dd = Einzeldatum, mm-dd = jährliche Wiederholung, easter[greg|jul|orth] = Ostersonntag, ascension = Christi Himmelfahrt, whitsun = Pfingstsonntag, Offset mit :+/-n z.B: easter:+1 = Ostermontag"
 
+msgctxt "field:cashbook.configuration,holidays_info:"
+msgid "Holidays"
+msgstr "Feiertage"
+
+msgctxt "help:cashbook.configuration,holidays_info:"
+msgid "Holidays in the current year."
+msgstr "Feiertage im aktuellen Jahr."
+
 
 ####################
 # cashbook.planner #

locale/en.po

@@ -70,6 +70,14 @@ msgctxt "help:cashbook.configuration,holidays:"
 msgid "Semicolon separate list of dates: yyyy-mm-dd = single date, mm-dd = annual repetition, easter[greg|jul|orth] = Easter Sunday, ascension = Ascension Day, whitsun = Whitsunday, offset with :+/-n e.g.: easter:+1 = Easter Monday"
 msgstr "Semicolon separate list of dates: yyyy-mm-dd = single date, mm-dd = annual repetition, easter[greg|jul|orth] = Easter Sunday, ascension = Ascension Day, whitsun = Whitsunday, offset with :+/-n e.g.: easter:+1 = Easter Monday"
 
+msgctxt "field:cashbook.configuration,holidays_info:"
+msgid "Holidays"
+msgstr "Holidays"
+
+msgctxt "help:cashbook.configuration,holidays_info:"
+msgid "Holidays in the current year."
+msgstr "Holidays in the current year."
+
 msgctxt "model:cashbook.planner,name:"
 msgid "Scheduled Booking"
 msgstr "Scheduled Booking"

tests/planner.py

@@ -156,11 +156,15 @@ class PlannerTestCase(object):
                 Config.holiday_parseconfig(None),
                 {'definition': '', 'dates': []})
 
+            with Transaction().set_context({'holiday_years': [2022]}):
                 cfg1 = Config(holidays='2022-05-01;easter;whitsun')
                 cfg1.save()
                 self.assertEqual(
                     cfg1.holiday_dates([2022]),
                     [date(2022, 5, 1), date(2022, 4, 17), date(2022, 6, 5)])
+                self.assertEqual(
+                    cfg1.holidays_info,
+                    '04/17/2022|05/01/2022|06/05/2022')
 
     @with_transaction()
     def test_planner_create_job(self):

view/configuration_form.xml

@@ -8,7 +8,7 @@ full copyright notices and license terms. -->
         <separator id="planner" colspan="4" string="Scheduled Bookings"/>
         <label name="holidays"/>
         <field name="holidays" colspan="3"/>
-        <newline/>
+        <field name="holidays_info" colspan="4"/>
 
     </xpath>