add python file for new writeup.

scripts/exercises.py

@@ -98,4 +98,4 @@ class Exercises(list):
             course=self.course.info['title'],
             number=new_num
         ))
-        ExerciseWriteUp(new_dir, self.course).open()
+        return ExerciseWriteUp(new_dir, self.course)

scripts/new-writeup.py

@@ -0,0 +1,6 @@
+#! /usr/bin/python3
+from courses import Courses
+
+course = Courses().current
+writeup = course.exercises.new_writeup()
+writeup.edit()

scripts/rofi-exercises.py

@@ -42,8 +42,8 @@ def rofi_pick_exercise(spec: str = 'writeup'):
 
 
 if __name__ == '__main__':
-    if not len(sys.argv) == 1:
+    if not len(sys.argv) == 2:
         print('Please specify exactly one of "writeup", "solution" and "sheet"')
         exit(1)
-    rofi_pick_exercise('writeup')
+    rofi_pick_exercise(sys.argv[1])
     exit(0)