Add caching

src/canvaslms/cli/assignments.nw

@@ -12,6 +12,7 @@ The [[assignment]] command lists information about a given assignment.
 
 We outline the module:
 <<assignments.py>>=
+import argparse
 import canvaslms.cli.courses as courses
 import canvaslms.hacks.canvasapi
 import csv

src/canvaslms/cli/submissions.nw

@@ -44,8 +44,7 @@ submissions_parser = subp.add_parser("submissions",
       "<Canvas-user-ID> <grade> <grade date>")
 submissions_parser.set_defaults(func=submissions_command)
 assignments.add_assignment_option(submissions_parser)
-<<set up options for limiting by group or user>>
-<<set up options for selecting type of submissions>>
+add_submission_options(submissions_parser)
 @ Now, that [[submissions_command]] function must take three arguments: 
 [[config]], [[canvas]] and [[args]].
 It must also do the processing for the assignment options using 
@@ -56,24 +55,6 @@ def submissions_command(config, canvas, args):
   <<get submissions and print them>>
 @
 
-\subsection{Limit by group}
-
-By default, we show all submission in the course.
-However, sometimes we're only interested in a group of students.
-<<set up options for limiting by group or user>>=
-users.add_user_or_group_option(submissions_parser)
-@
-
-\subsection{Selecting the type of submissions}
-
-We also want to be able to filter out the type of submissions.
-For now, we focus on all or ungraded.
-<<set up options for selecting type of submissions>>=
-submissions_parser.add_argument("-U", "--ungraded", action="store_true",
-  help="Show only ungraded submissions.")
-@ We don't need to do any particular processing for this option.
-
-
 \subsection{Get and print the list of submissions}
 
 We then simply call the appropriate list-submissions function with the 
@@ -164,6 +145,12 @@ for submission in submission_list:
 
 We now provide a function to set up the command-line options to select a 
 particular submission along with a function to process those options.
+For this we need
+\begin{itemize}
+\item an assignment,
+\item a user or group,
+\item to know if we aim for all or just ungraded submissions.
+\end{itemize}
 <<functions>>=
 def add_submission_options(parser):
   try:
@@ -176,10 +163,20 @@ def add_submission_options(parser):
   except argparse.ArgumentError:
     pass
 
+  submissions_parser = parser.add_argument_group("filter submissions")
+  submissions_parser.add_argument("-U", "--ungraded", action="store_true",
+    help="Only ungraded submissions.")
+
 def process_submission_options(canvas, args):
   assignment_list = assignments.process_assignment_option(canvas, args)
   user_list = users.process_user_or_group_option(canvas, args)
-  return list(filter_submissions(list_submissions(assignment_list), user_list))
+
+  if args.ungraded:
+    submissions = list_ungraded_submissions(assignment_list)
+  else:
+    submissions = list_submissions(assignment_list)
+
+  return list(filter_submissions(submissions, user_list))
 @