From c4c44a9a2bb71b2e91b3ee56417328d0d27f79e0 Mon Sep 17 00:00:00 2001
From: Anupam K <anupamvns0099@gmail.com>
Date: Wed, 15 Apr 2020 12:58:24 +0530
Subject: [PATCH 1/2] Initial JS setup

---
 .../crm/doctype/opportunity/opportunity_calendar.js  | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 erpnext/crm/doctype/opportunity/opportunity_calendar.js

diff --git a/erpnext/crm/doctype/opportunity/opportunity_calendar.js b/erpnext/crm/doctype/opportunity/opportunity_calendar.js
new file mode 100644
index 00000000000..983be9bf2da
--- /dev/null
+++ b/erpnext/crm/doctype/opportunity/opportunity_calendar.js
@@ -0,0 +1,12 @@
+// Copyright (c) 2020, Frappe Technologies Pvt. Ltd. and Contributors
+// License: GNU General Public License v3. See license.txt
+frappe.views.calendar["Opportunity"] = {
+	field_map: {
+		"start": "contact_date",
+		"end": "contact_date",
+		"id": "name",
+		"title": "customer_name",
+		"allDay": "allDay"
+	},
+    get_events_method: 'frappe.desk.doctype.event.event.get_events'
+}

From 9ee81104110b735df1e592c7fd001464f06e9e9d Mon Sep 17 00:00:00 2001
From: Anupam K <anupamvns0099@gmail.com>
Date: Wed, 15 Apr 2020 18:37:35 +0530
Subject: [PATCH 2/2] Adding Calendar view for Opportunity

---
 .../crm/doctype/opportunity/opportunity.py    | 24 +++++++++++++++++++
 .../opportunity/opportunity_calendar.js       | 11 +++++++--
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/erpnext/crm/doctype/opportunity/opportunity.py b/erpnext/crm/doctype/opportunity/opportunity.py
index 5e640e78c8a..1b071ea1b70 100644
--- a/erpnext/crm/doctype/opportunity/opportunity.py
+++ b/erpnext/crm/doctype/opportunity/opportunity.py
@@ -336,3 +336,27 @@ def make_opportunity_from_communication(communication, ignore_communication_link
 	link_communication_to_document(doc, "Opportunity", opportunity.name, ignore_communication_links)
 
 	return opportunity.name
+@frappe.whitelist()
+def get_events(start, end, filters=None):
+	"""Returns events for Gantt / Calendar view rendering.
+	:param start: Start date-time.
+	:param end: End date-time.
+	:param filters: Filters (JSON).
+	"""
+	from frappe.desk.calendar import get_event_conditions
+	conditions = get_event_conditions("Opportunity", filters)
+
+	data = frappe.db.sql("""
+		select
+			distinct `tabOpportunity`.name, `tabOpportunity`.customer_name, `tabOpportunity`.opportunity_amount,
+			`tabOpportunity`.title, `tabOpportunity`.contact_date
+		from
+			`tabOpportunity`
+		where
+			(`tabOpportunity`.contact_date between %(start)s and %(end)s)
+			{conditions}
+		""".format(conditions=conditions), {
+			"start": start,
+			"end": end
+		}, as_dict=True, update={"allDay": 0})
+	return data
\ No newline at end of file
diff --git a/erpnext/crm/doctype/opportunity/opportunity_calendar.js b/erpnext/crm/doctype/opportunity/opportunity_calendar.js
index 983be9bf2da..58fa2b8cd86 100644
--- a/erpnext/crm/doctype/opportunity/opportunity_calendar.js
+++ b/erpnext/crm/doctype/opportunity/opportunity_calendar.js
@@ -7,6 +7,13 @@ frappe.views.calendar["Opportunity"] = {
 		"id": "name",
 		"title": "customer_name",
 		"allDay": "allDay"
-	},
-    get_events_method: 'frappe.desk.doctype.event.event.get_events'
+    },
+	options: {
+		header: {
+			left: 'prev,next today',
+			center: 'title',
+			right: 'month'
+		}
+    },
+    get_events_method: 'erpnext.crm.doctype.opportunity.opportunity.get_events'
 }