diff -r 29211b72b64f -r 6d87fbbfc10a roundup/cgi/engine_jinja2.py
--- a/roundup/cgi/engine_jinja2.py	Mon Jun 15 18:16:06 2015 +0300
+++ b/roundup/cgi/engine_jinja2.py	Thu Jun 18 15:36:58 2015 +0300
@@ -33,6 +33,7 @@
 
 import jinja2
 import gettext
+import pprint
 
 # http://jinja.pocoo.org/docs/api/#loaders
 
@@ -43,12 +44,13 @@
         extensions = [
             'jinja2.ext.autoescape',
         ]
-        print "Jinja2 templates: ", dir 
+        print "Jinja2 templates: ", dir
         print "Extensions: ", extensions
         self._env = jinja2.Environment(
                         loader=jinja2.FileSystemLoader(dir),
                         extensions=extensions
                     )
+        self._env.filters.update(additional_filters)
 
     def check(self, tplname):
         #print tplname
@@ -86,3 +88,30 @@
         # [ ] figure out what are these for
         raise NotImplemented
         #return getattr(self._pt, name)
+
+# -- customizing Jinja2 ---
+
+def debug(value):
+    ''' Dump variable in html.
+    '''
+    alist = []
+    for attr in dir(value):
+        if attr[0] == '_':
+            continue
+        aval = getattr(value, attr)
+        if callable(aval):
+            alist.append("{} ({})".format( attr, type(aval).__name__))
+        else:
+            alist.append("{} ({}) = {}".format( attr, type(aval).__name__, aval))
+
+    pprinter = pprint.PrettyPrinter(depth=1)
+    return "\n<pre>\n" + "Type is '{}'.".format(type(value).__name__) +\
+            "\nValue(s) is:\n" + pprinter.pformat(value) +\
+            "\nAttributes are:\n" + '\n'.join(alist) +\
+            "\n</pre>\n"
+
+
+
+# - declare additional filters dictionary-
+additional_filters = {}
+additional_filters['debug'] = debug