feat: implemented autosave for sections

Now the changes made to the code in each section will be autosaved and loaded
back on next page load.

community/lms/api.py

@@ -0,0 +1,23 @@
+"""API methods for the LMS.
+"""
+
+import frappe
+
+@frappe.whitelist()
+def autosave_section(section, code):
+    """Saves the code edited in one of the sections.
+    """
+    doc = frappe.get_doc(
+        doctype="Code Revision",
+        section=section,
+        code=code,
+        author=frappe.session.user)
+    doc.insert()
+    return {"name": doc.name}
+
+@frappe.whitelist()
+def get_section(name):
+    """Saves the code edited in one of the sections.
+    """
+    doc = frappe.get_doc("LMS Section", name)
+    return doc and doc.as_dict()

community/lms/doctype/lms_section/lms_section.py

@@ -3,9 +3,27 @@
 # For license information, please see license.txt
 
 from __future__ import unicode_literals
-# import frappe
+import frappe
 from frappe.model.document import Document
 
 class LMSSection(Document):
     def __repr__(self):
         return f"<LMSSection {self.label!r}>"
+
+    def get_latest_code_for_user(self):
+        """Returns the latest code for the logged in user.
+        """
+        if not frappe.session.user or frappe.session.user == "Guest":
+            return self.contents
+        result = frappe.get_all('Code Revision',
+            fields=["code"],
+            filters={
+                "author": frappe.session.user,
+                "section": self.name
+            },
+            order_by="creation desc",
+            page_length=1)
+        if result:
+            return result[0]['code']
+        else:
+            return self.contents