[base harvester] Custom tag munge function. TODO: check with flexible tags

ckanext/harvest/harvesters/base.py

@@ -1,5 +1,5 @@
 import logging
-
+import re
 
 from ckan import model
 from ckan.model import Session, Package
@@ -7,7 +7,7 @@ from ckan.logic import ValidationError, NotFound, get_action
 
 from ckan.logic.schema import default_package_schema
 from ckan.lib.navl.validators import ignore_missing
-from ckan.lib.munge import munge_title_to_name, munge_tag
+from ckan.lib.munge import munge_title_to_name,substitute_ascii_equivalents
 
 from ckanext.harvest.model import HarvestJob, HarvestObject, HarvestGatherError, \
                                     HarvestObjectError
@@ -17,6 +17,11 @@ from ckanext.harvest.interfaces import IHarvester
 
 log = logging.getLogger(__name__)
 
+def munge_tag(tag):
+    tag = substitute_ascii_equivalents(tag)
+    tag = tag.lower().strip()
+    return re.sub(r'[^a-zA-Z0-9 -]', '', tag).replace(' ', '-')
+
 class HarvesterBase(SingletonPlugin):
     '''
     Generic class for  harvesters with helper functions