callback_plugin: difflib: ndiff -> context_diff

geant/gap_ansible/plugins/callback_plugins/filtering_syslog.py

@@ -43,8 +43,8 @@ class CallbackModule(CallbackBase):
             display.display("DIFF:", color="blue")
             _before = result._result['diff']['before']
             _after = result._result['diff']['after']
-            for line in difflib.ndiff(_before.splitlines(), _after.splitlines()):
-                if line.startswith('+ ') or line.startswith('- ') or line.startswith('? '):
+            difference = difflib.context_diff(_before.splitlines(), _after.splitlines(), n=10)
+            for line in difference:
                 display.display(line)
 
         # Display full result if not ok