Updated changes view to use diff where appropriate.

RIGS/versioning.py

@@ -17,6 +17,7 @@ from reversion.models import Version
 from django.contrib.contenttypes.models import ContentType # Used to lookup the content_type
 from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
 from django.db.models import ForeignKey, IntegerField, EmailField, TextField
+from diff_match_patch import diff_match_patch
 
 from RIGS import models, forms
 import datetime
@@ -64,6 +65,25 @@ def model_compare(oldObj, newObj, excluded_keys=[]):
                 return True
             return False
 
+        @property
+        def diff(self):
+            oldText = str(self.display_value(self._old)) or ""
+            newText = str(self.display_value(self._new)) or ""
+            dmp = diff_match_patch()
+            diffs = dmp.diff_main(oldText, newText)
+            dmp.diff_cleanupSemantic(diffs)
+
+            outputDiffs = []
+
+            for (op, data) in diffs:
+              if op == dmp.DIFF_INSERT:
+                outputDiffs.append({'type':'insert', 'text':data})
+              elif op == dmp.DIFF_DELETE:
+                outputDiffs.append({'type':'delete', 'text':data})
+              elif op == dmp.DIFF_EQUAL:
+                outputDiffs.append({'type':'equal', 'text':data})
+            return outputDiffs
+
     changes = []
 
     for thisField in theFields: