add line formatting for events

I want to color a table row in a certain color if a early end of class
causes my lesson to be canceled.
To do so I use the new configuration table:

```toml
[event_line_formats]
Unterrichtsschluss = '\\rowcolor{{red!30}} {line}'```

1 files changed, 9 insertions, 3 deletions

diff --git a/lessons.py b/lessons.py
index b29918d..10476c3 100755
--- a/lessons.py
+++ b/lessons.py
@@ -93,15 +93,21 @@ def format_period(period: webuntis.objects.PeriodObject,
         # strip the leading ' ' and trailing ' |'
         period_events = period_events[1:-2]
 
-    output = config.get(
+    fmt = config.get(
         'fmt') or '{week} {date.strftime(\'%d.%m\')} {period_events}'
     # Using eval here instead of string.format() is potentially dangerous.
     # However, I do not consider this an actual thread because this is an
     # obscure script run with only trusted inputs (cli arguments, manual written
     # config), therefore potential code execution is not a real concern.
-    output = eval(F'f"{output}"')  # pylint: disable=eval-used
+    line = eval('f' + f'"{fmt}"')  # pylint: disable=eval-used
 
-    return output
+    # Apply event_line_formats
+    event_line_formats = config.get('event_line_formats', [])
+    for ev in period_evs:
+        if ev.summary in event_line_formats:
+            line = eval('f' + f'"{event_line_formats[ev.summary]}"')
+
+    return line
 
 
 def filter_periods(timetable: webuntis.objects.PeriodList,