fixes bug: crash by marking work as mastered twice, updates README with more known bugs

README.md

@@ -27,7 +27,7 @@ At the moment, an alpha version is undertaken, with these features:
 - Works are shown sorted by composer and opus/work_directory-number (`s`, `smo`) or by composer and collection (`sm`)
 - Remove work or movement from being mastered for active user (`r number_of_work` or `r number_of_work number_of_movement`)
 - Remove user (`delete_my_user_record_including_all_mastered_works`)
-- (planned) Fix known bugs
+- Fix bug: double marking crashes the program
 
 _(planned) Release piano_repertoire_cli V 0.0.1 alpha (learn about versioning before)_
 
@@ -44,4 +44,6 @@ _(planned) Port funtionality to a kivy-GUI_
 
 ## Known Bugs
 
-- Marking a piece as mastered the second time, the database won’t insert the entry and the program will crash
+- User numbers are allowed to set without a user being present, with marking works as mastered leading to crash the program
+- Trying to mark works as mastered that are not present crashes the program
+- Providing alphabetic chars where numbers are expected crashes the program

rep_cli.py

@@ -218,6 +218,9 @@ class Session:
             work = work_under_id(work_id, self.db_agent)
             if len(arguments) > 1: # in case there is a movement number given
                 mov_number = int(arguments[1])
+                if self.movement_is_mastered(work_id, mov_number):
+                    resultstring += f'Already marked as mastered: {work.pretty_mov(mov_number)}\n'
+                else:
                     sql_command = f'''
                                   INSERT INTO is_able_to_play (work_id, mov_id, pianist_id)
                                   VALUES ({work_id}, {mov_number}, {self.user})
@@ -226,6 +229,9 @@ class Session:
                     resultstring += f'{work.pretty_mov(mov_number)}\n'
             else: # mark all movements of the work as mastered
                 for mov_number in work.values['movements'].keys():
+                    if self.movement_is_mastered(work_id, mov_number):
+                        resultstring += f'Already marked as mastered: {work.pretty_mov(mov_number)}\n'
+                    else:
                         sql_command = f'''
                                       INSERT INTO is_able_to_play (work_id, mov_id, pianist_id)
                                       VALUES ({work_id}, {mov_number}, {self.user})