1 files changed, 12 insertions, 6 deletions
diff --git a/examples/simple/filter_flows.py b/examples/simple/filter_flows.py
index 896fa54a..fd49425a 100644
--- a/examples/simple/filter_flows.py
+++ b/examples/simple/filter_flows.py
@@ -1,15 +1,21 @@
 """
 This scripts demonstrates how to use mitmproxy's filter pattern in scripts.
-Usage:
-    mitmdump -s "flowfilter.py FILTER"
 """
-import sys
 from mitmproxy import flowfilter
+from mitmproxy import ctx
 
 
 class Filter:
-    def __init__(self, spec):
-        self.filter = flowfilter.parse(spec)
+    def __init__(self):
+        self.filter = None
+
+    def configure(self, updated):
+        self.filter = flowfilter.parse(ctx.options.flowfilter)
+
+    def load(self, l):
+        l.add_option(
+            "flowfilter", str, "", "Check that flow matches filter."
+        )
 
     def response(self, flow):
         if flowfilter.match(self.filter, flow):
@@ -17,4 +23,4 @@ class Filter:
             print(flow)
 
 
-addons = [Filter(sys.argv[1])]
+addons = [Filter()]