core: better command handling

* check argument of do
* automatically set optional struct members from function signature

Change-Id: I95684f1826c1318ea92fad2bd4c9681d85ea72f5
Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/32501
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Alexander Zaft <a.zaft@fz-juelich.de>

test/test_params.py

@@ -25,7 +25,7 @@
 # no fixtures needed
 import pytest
 
-from frappy.datatypes import BoolType, FloatRange, IntRange
+from frappy.datatypes import BoolType, FloatRange, IntRange, StructOf
 from frappy.errors import ProgrammingError
 from frappy.modules import HasAccessibles
 from frappy.params import Command, Parameter
@@ -57,6 +57,29 @@ def test_Command():
                                            'description': 'do some other thing'}
 
 
+def test_cmd_struct_opt():
+    with pytest.raises(ProgrammingError):
+        class WrongName(HasAccessibles):  # pylint: disable=unused-variable
+            @Command(StructOf(a=IntRange(), b=IntRange()))
+            def cmd(self, a, c):
+                pass
+    class Mod(HasAccessibles):
+        @Command(StructOf(a=IntRange(), b=IntRange()))
+        def cmd(self, a=5, b=5):
+            pass
+    assert Mod.cmd.datatype.argument.optional == ['a', 'b']
+    class Mod2(HasAccessibles):
+        @Command(StructOf(a=IntRange(), b=IntRange()))
+        def cmd(self, a, b=5):
+            pass
+    assert Mod2.cmd.datatype.argument.optional == ['b']
+    class Mod3(HasAccessibles):
+        @Command(StructOf(a=IntRange(), b=IntRange()))
+        def cmd(self, a, b):
+            pass
+    assert Mod3.cmd.datatype.argument.optional == []
+
+
 def test_Parameter():
     class Mod(HasAccessibles):
         p1 = Parameter('desc1', datatype=FloatRange(), default=0)