feat: added next/prev links to learn pages

community/lms/doctype/lesson/lesson.py

@@ -22,3 +22,18 @@ class Lesson(Document):
             s.contents = section.contents
             s.index = index
             return s
+
+    def get_next(self):
+        """Returns the number for the next lesson.
+
+        The return value would be like 1.2, 2.1 etc.
+        It will be None if there is no next lesson.
+        """
+
+
+    def get_prev(self):
+        """Returns the number for the prev lesson.
+
+        The return value would be like 1.2, 2.1 etc.
+        It will be None if there is no next lesson.
+        """

community/lms/doctype/lms_course/lms_course.py

@@ -190,3 +190,46 @@ class LMSCourse(Document):
             {"chapter": chapter_name, "index_": lesson_index},
             "name")
         return lesson_name and frappe.get_doc("Lesson", lesson_name)
+
+    def get_outline(self):
+        return CourseOutline(self)
+
+class CourseOutline:
+    def __init__(self, course):
+        self.course = course
+        self.chapters = self.get_chapters()
+        self.lessons = self.get_lessons()
+
+    def get_next(self, current):
+        numbers = sorted(lesson['number'] for lesson in self.lessons)
+        try:
+            index = numbers.index(current)
+            return numbers[index+1]
+        except IndexError:
+            return None
+
+    def get_prev(self, current):
+        numbers = sorted(lesson['number'] for lesson in self.lessons)
+        try:
+            index = numbers.index(current)
+            if index == 0:
+                return None
+            return numbers[index-1]
+        except IndexError:
+            return None
+
+    def get_chapters(self):
+        return frappe.db.get_all("Chapter",
+            filters={"course": self.course.name},
+            fields=["name", "title", "index_"])
+
+    def get_lessons(self):
+        chapters = [c['name'] for c in self.chapters]
+        lessons = frappe.db.get_all("Lesson",
+            filters={"chapter": ["IN", chapters]},
+            fields=["name", "title", "chapter", "index_"])
+
+        chapter_numbers = {c['name']: c['index_'] for c in self.chapters}
+        for lesson in lessons:
+            lesson['number'] = "{}.{}".format(chapter_numbers[lesson['chapter']], lesson['index_'])
+        return lessons