Added new Param.flags attribute (set with flags=foo kwarg)

ipalib/frontend.py

@@ -207,6 +207,7 @@ class Param(plugable.ReadOnly):
     normalize     callable           None
     default       same as type.type  None
     default_from  callable           None
+    flags         frozenset          frozenset()
     ============  =================  ==================
     """
     __nones = (None, '', tuple(), [])
@@ -220,6 +221,7 @@ class Param(plugable.ReadOnly):
         normalize=None,
         default=None,
         default_from=None,
+        flags=frozenset(),
         rules=tuple(),
     )
 
@@ -249,6 +251,7 @@ class Param(plugable.ReadOnly):
         self.default_from = check_type(df, DefaultFrom, 'default_from',
             allow_none=True
         )
+        self.flags = frozenset(kw['flags'])
         self.__normalize = kw['normalize']
         self.rules = self.__check_type(tuple, 'rules')
         self.all_rules = (self.type.validate,) + self.rules

tests/test_ipalib/test_frontend.py

@@ -162,6 +162,7 @@ class test_Param(ClassChecker):
         assert read_only(o, 'multivalue') is False
         assert read_only(o, 'default') is None
         assert read_only(o, 'default_from') is None
+        assert read_only(o, 'flags') == frozenset()
         assert read_only(o, 'rules') == tuple()
         assert len(read_only(o, 'all_rules')) == 1
         assert read_only(o, 'primary_key') is False
@@ -183,6 +184,8 @@ class test_Param(ClassChecker):
             assert type(o.default_from) is frontend.DefaultFrom
             assert o.default_from.keys == ('first', 'last')
             assert o.default_from.callback('butt', 'erfly') == 'butterfly'
+        assert self.cls(name, flags=('one', 'two', 'three')).flags == \
+            frozenset(['one', 'two', 'three'])
         rules = (lambda whatever: 'Not okay!',)
         o = self.cls(name, rules=rules)
         assert o.rules is rules