[WIP] work on history writer

Change-Id: If8c42091c734fb8c7b386c06429f1b21a7e169ec

secop/params.py

@@ -27,7 +27,7 @@ import inspect
 
 from secop.datatypes import BoolType, CommandType, DataType, \
     DataTypeType, EnumType, IntRange, NoneOr, OrType, \
-    StringType, StructOf, TextType, TupleOf, ValueType
+    StringType, StructOf, TextType, TupleOf, ValueType, ArrayOf
 from secop.errors import BadValueError, ProgrammingError
 from secop.properties import HasProperties, Property
 
@@ -163,6 +163,52 @@ class Parameter(Accessible):
 
         default None: write if given in config''', NoneOr(BoolType()),
         export=False, default=None, settable=False)
+    history_category = Property(
+        '''[custom] category for history
+
+        major: should be shown by default in a history chart, default for value and target
+        minor: to be shown optionally in a history chart, default for other parameters
+        no: history is not saved. default for TextType and ArrayOf
+        
+        category is ignored (forced to no) for BlobType
+        
+        For structured types, the category may be a comma separated list, overwriting the
+        default for the first or all curves.
+        If it does not contain a comma, it applies for all curves
+        ''',
+        NoneOr(StringType()), export=True, default=None, settable=False)
+    history_label = Property(
+        '''[custom] label for history
+
+        default: <modname>:<parname> or <modname> for main value
+        
+        For structured types, the label may be a comma separated list, overwriting the
+        default for the first or all curves.
+        If it does not contain a comma, it applies for the first curve only.
+        ''',
+        NoneOr(StringType()), export=True, default=None, settable=False)
+    history_group = Property(
+        '''[custom] group for history
+
+        default: unit
+
+        For structured types, the group may be a comma separated list, overwriting the
+        default for the first or all curves. If it does not contain a comma, it is
+        applies for all curves.
+        ''',
+        NoneOr(StringType()), export=True, default=None, settable=False)
+    history_stepped = Property(
+        '''[custom] stepped curve
+
+        Whether a curve has to be drawn stepped or connected.
+        default: True when readonly=False, else False
+        
+        Applicable to FloatRange and ScaledInteger only, other types are stepped by definition.
+        
+        For structured types, stepped may be a list, overwriting the default for the
+        first or all curves. If not, applieas to all curves.
+        ''',
+        OrType(BoolType(), ArrayOf(BoolType())), export=True, default=False, settable=False)
 
     # used on the instance copy only
     value = None