--- a/web/formfields.py	Tue Aug 10 08:28:16 2010 +0200
+++ b/web/formfields.py	Tue Aug 10 08:39:06 2010 +0200
@@ -73,6 +73,7 @@
                               FormatConstraint)
 
 from cubicweb import Binary, tags, uilib
+from cubicweb.utils import support_args
 from cubicweb.web import INTERNAL_FIELD_VALUE, ProcessFormError, eid_param, \
      formwidgets as fw, uicfg
 
@@ -345,7 +346,12 @@
     def initial_typed_value(self, form, load_bytes):
         if self.value is not _MARKER:
             if callable(self.value):
-                return self.value(form)
+                if support_args(self.value, 'form', 'field'):
+                    return self.value(form, self)
+                else:
+                    warn("[3.10] field's value callback must now take form and field as argument",
+                         DeprecationWarning)
+                    return self.value(form)
             return self.value
         formattr = '%s_%s_default' % (self.role, self.name)
         if hasattr(form, formattr):

--- a/web/views/formrenderers.py	Tue Aug 10 08:28:16 2010 +0200
+++ b/web/views/formrenderers.py	Tue Aug 10 08:39:06 2010 +0200
@@ -41,7 +41,7 @@
 from cubicweb import tags
 from cubicweb.appobject import AppObject
 from cubicweb.selectors import is_instance, yes
-from cubicweb.utils import json_dumps
+from cubicweb.utils import json_dumps, support_args
 from cubicweb.web import eid_param, formwidgets as fwdgs
 
 
@@ -53,6 +53,8 @@
         name, value, checked, attrs)
 
 def field_label(form, field):
+    if callable(field.label):
+        return field.label(form, field)
     # XXX with 3.6 we can now properly rely on 'if field.role is not None' and
     # stop having a tuple for label
     if isinstance(field.label, tuple): # i.e. needs contextual translation
@@ -133,7 +135,12 @@
         help = []
         descr = field.help
         if callable(descr):
-            descr = descr(form)
+            if support_args(descr, 'form', 'field'):
+                descr = descr(form, field)
+            else:
+                warn("[3.10] field's help callback must now take form and field as argument",
+                     DeprecationWarning)
+                descr = descr(form)
         if descr:
             help.append('<div class="helper">%s</div>' % self._cw._(descr))
         example = field.example_format(self._cw)