cli returns a json compatible string

Author: manfred-kaiser

README.md

@@ -48,8 +48,10 @@ message and message store based on the actions returned.
 COMMAND LINE
 ============
 
+The output of the command line tool can be parsed as json.
+
     $ sifter tests/evaluation_1.rules tests/evaluation_1.msg
-    [('redirect', 'acm@example.com')]
+    [['redirect', 'acm@example.com']]
 
 
 WARNINGS

docs/index.rst

@@ -48,10 +48,12 @@ actions returned.
 COMMAND LINE
 ------------
 
+The output of the command line tool can be parsed as json.
+
 .. code-block:: bash
 
     $ sifter tests/evaluation_1.rules tests/evaluation_1.msg
-    [('redirect', 'acm@example.com')]
+    [['redirect', 'acm@example.com']]
 
 
 WARNINGS

sifter/cli.py

@@ -3,6 +3,7 @@
 import os
 import logging
 import sys
+import json
 
 import sifter.parser
 
@@ -24,4 +25,4 @@ def main() -> None:
     rules = sifter.parser.parse_file(open(args.rulefile))
     msg = email.message_from_file(open(args.messagefile))
     msg_actions = rules.evaluate(msg)
-    print(msg_actions)
+    print(json.dumps(msg_actions, indent=4))