Cleanup and fixes for merge request crackwitz/website-cutprogress-reformat

Date and time functions in SQL are highly incompatible between different
db engines. All queries must work with sqlite and mysql/mariadb.

cutprogress.py

 from server import *
-import datetime
 
 @register_navbar('Schnittfortschritt User', icon='spinner', iconlib='fa', userendpoint=True, endpoint='cutprogress_user')
 @register_navbar('Schnittfortschritt', icon='spinner', iconlib='fa')
@@ -7,19 +6,15 @@ import datetime
 @app.route('/internal/user/<int:user>/cutprogress', endpoint='cutprogress_user')
 @mod_required
 def cutprogress(user=None):
-	# use request argument, default to latest semester
 	allsemester = query('SELECT DISTINCT semester from courses ORDER BY semester DESC')
 	semester = request.values.get('semester', allsemester[0]['semester'])
-
-	# find courses for semester
 	courses = query('''
 		SELECT courses.id, courses.handle, courses.short
 		FROM courses
 		WHERE semester = ?
 		ORDER by id DESC
 		''', semester)
-
-	# list of people responsible for course
+	# Fetch list of people responsible for every course
 	for course in courses:
 		people = query('''
 			SELECT users.*
@@ -28,27 +23,22 @@ def cutprogress(user=None):
 			WHERE responsible.course_id = ?
 			ORDER BY users.realname ASC
 			''', course['id'])
-
 		if not people:
 			people = [{ 'realname': 'Niemand', 'id': -1 }]
-
 		course['responsible'] = people
-
-	# filter for responsibility
 	if user is not None:
 		courses = [
 			c for c in courses
 			if user in (r['id'] for r in c['responsible'])
 		]
-
-	# fetch lectures for courses
+	# Fetch lectures for all courses
 	lectures = []
 	for c in courses:
 		lectures += query('''
 			SELECT
 				lectures.id,
 				lectures.course_id,
-				lectures.time, DATE(lectures.time) as date,
+				lectures.time,
 				lectures.title,
 				COUNT(videos.id) as videos_total,
 				COUNT(videos.visible) as videos_visible
@@ -56,25 +46,18 @@ def cutprogress(user=None):
 			JOIN courses ON courses.id = lectures.course_id
 			LEFT JOIN videos ON lectures.id = videos.lecture_id
 			WHERE courses.id = ?
-				AND date <= DATE('now')
+				AND lectures.time <= ?
 				AND NOT lectures.norecording
 			GROUP BY lectures.id
-			ORDER BY date DESC, lectures.time ASC, lectures.id ASC
-			''', c['id'])
-
-	# sort dates, figure out when weeks change
-	dates = sorted({
-		datetime.datetime.strptime(row['date'], '%Y-%m-%d')
-		for row in lectures
-	}, reverse=True)
-
-	# check week numbers
+			ORDER BY lectures.time ASC, lectures.id ASC
+			''', c['id'], datetime.now())
+	# Generate list of days, figure out when weeks change
+	dates = sorted({row['time'].date() for row in lectures}, reverse=True)
 	is_new_weeks = [
 		False if (i == 0) else thisdate.isocalendar()[1] != dates[i-1].isocalendar()[1]
 		for i, thisdate in enumerate(dates)
 	]
-
-	# sort into cells
+	# Sort into cells
 	tablebody = [
 		{
 			'date': date, # row header
@@ -83,23 +66,19 @@ def cutprogress(user=None):
 				[ # this list is a cell
 					lecture
 					for lecture in lectures
-					if lecture['course_id'] == course['id'] and datetime.datetime.strptime(lecture['date'], '%Y-%m-%d') == date
-					and (user is None or user in [r['id'] for r in course['responsible']])
+					if lecture['course_id'] == course['id'] and lecture['time'].date() == date
 				]
 				for course in courses
 			]
 		}
 		for date, is_new_week in zip(dates, is_new_weeks)
 	]
-
 	return render_template('cutprogress.html',
 		# dropdown selection
 		allsemester=allsemester, # options
 		semester=semester, # choice
 		user=query('SELECT * FROM users WHERE id = ?', user)[0] if user else None,
-
 		# content
 		courses=courses,
-		dates=dates,
-		tablebody=tablebody,
+		tablebody=tablebody
 	)