lists: fix mirror mapping output

app/cli/list.py

@@ -0,0 +1,38 @@
+import argparse
+import json
+import logging
+import sys
+from typing import Callable
+
+from app import app, mirror_sites
+from app.lists.bridgelines import bridgelines
+from app.lists.mirror_mapping import mirror_mapping
+
+lists = {
+    "mirror_mapping": mirror_mapping,
+    "bc2": mirror_sites,
+    "bridgelines": bridgelines,
+}
+
+
+def dump(list_f: Callable):
+    json.dump(list_f(), sys.stdout, indent=2)
+
+
+class ListCliHandler:
+    @classmethod
+    def add_subparser_to(cls, subparsers: argparse._SubParsersAction) -> None:
+        parser = subparsers.add_parser("list", help="list operations")
+        parser.add_argument("--dump", choices=sorted(lists.keys()),
+                            help="dump a list in JSON format")
+        parser.set_defaults(cls=cls)
+
+    def __init__(self, args):
+        self.args = args
+
+    def run(self):
+        with app.app_context():
+            if self.args.dump:
+                dump(lists[self.args.dump])
+            else:
+                logging.error("No action requested")