refactored common logic for printing the outcome; incl. case where nothing needs to be done

utils/printing.py

@@ -1,6 +1,20 @@
-from .consts import SYM_GOOD, SYM_BAD
+from .consts import SYM_NOTHING, SYM_GOOD, SYM_BAD
+from .seq import is_empty
 
 
+def print_outcome(state, units):
+    if is_empty(state):
+        print_nothing("nothing to do")
+    elif all(state):
+        print_good(f"all {units}")
+    else:
+        ntotal = len(state)
+        ngood = count_true(state)
+        print_bad(f"only {ngood}/{ntotal} {units}")
+
+def print_nothing(*args, **kwargs):
+    return print(SYM_NOTHING, *args, **kwargs)
+
 def print_good(*args, **kwargs):
     return print(SYM_GOOD, *args, **kwargs)