[ADD]show_unusual_days_on_calendar

show_unusual_days_on_calendar/__init__.py

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+from . import models

show_unusual_days_on_calendar/__manifest__.py

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+# Copyright 2022 Stéphan Sainléger (Elabore)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+{
+    "name": "show_unusual_days_on_calendar",
+    "version": "14.0.1.0.0",
+    "author": "Elabore",
+    "website": "https://elabore.coop",
+    "maintainer": "Clément Thomas / Laetitia Da Costa",
+    "license": "AGPL-3",
+    "category": "Tools",
+    "summary": "show unusual days such as leaves or holidays on event calendar in the same way it does in hr_leave calendar \n (event in gray background and white borders)",
+    # any module necessary for this one to work correctly
+    "depends": [
+        "calendar",
+        "hr_holidays",
+    ],
+    "qweb": [
+    ],
+    "external_dependencies": {
+        "python": [],
+    },
+    # always loaded
+    "data": [
+        'views/calendar_event_views.xml',
+    ],
+    # only loaded in demonstration mode
+    "demo": [],
+    "js": [],
+    "css": [],
+    "installable": True,
+    # Install this module automatically if all dependency have been previously
+    # and independently installed.  Used for synergetic or glue modules.
+    "auto_install": False,
+    "application": False,
+}

show_unusual_days_on_calendar/models/__init__.py

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+from . import calendar_event

show_unusual_days_on_calendar/models/calendar_event.py

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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import api, fields, models
+from datetime import datetime, time
+
+class CalendarEvent(models.Model):
+    _inherit = 'calendar.event'
+
+    @api.model
+    def get_unusual_days(self, date_from, date_to=None):
+        return self.env['hr.leave'].get_unusual_days(date_from, date_to=date_to)

show_unusual_days_on_calendar/views/calendar_event_views.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+    <data>
+        <record id="view_calendar_event_calendar_unusual_days_inherit" model="ir.ui.view">
+            <field name="name">calendar.event.calendar.unusual.days.inherit</field>
+            <field name="model">calendar.event</field>
+            <field name="inherit_id" ref="calendar.view_calendar_event_calendar"/>
+            <field name="arch" type="xml">
+                <calendar position="attributes">
+                    <attribute name="show_unusual_days">True</attribute>
+                </calendar>
+            </field>
+        </record>
+    </data>
+</odoo>