add a couple of cache management commands

Change-Id: I15c14f9a64a9ae5d8dca6dd452d6ebae18fb51be
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

goal_tools/caching.py

@@ -39,3 +39,8 @@ class Cache:
 
     def __getitem__(self, key):
         return self._shelf[self._mk_key(key)]
+
+    def __delitem__(self, key):
+        real_key = self._mk_key(key)
+        if real_key in self._shelf:
+            del self._shelf[real_key]

goal_tools/who_helped/cache.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python3
+
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import logging
+import pprint
+
+from cliff import command
+
+LOG = logging.getLogger(__name__)
+
+
+class CacheRemove(command.Command):
+    "Remove an entry from the cache."
+
+    def get_parser(self, prog_name):
+        parser = super().get_parser(prog_name)
+        parser.add_argument(
+            'type',
+            choices=['review', 'email'],
+            help='the kind of thing to remove',
+        )
+        parser.add_argument(
+            'id',
+            help='the id of the item to remove',
+        )
+        return parser
+
+    def take_action(self, parsed_args):
+        del self.app.cache[(parsed_args.type, parsed_args.id)]
+
+
+class CacheShow(command.Command):
+    "Show an entry in the cache."
+
+    def get_parser(self, prog_name):
+        parser = super().get_parser(prog_name)
+        parser.add_argument(
+            'type',
+            choices=['review', 'email'],
+            help='the kind of thing to remove',
+        )
+        parser.add_argument(
+            'id',
+            help='the id of the item to remove',
+        )
+        return parser
+
+    def take_action(self, parsed_args):
+        data = self.app.cache[(parsed_args.type, parsed_args.id)]
+        pprint.pprint(data)

setup.cfg

@@ -32,6 +32,8 @@ who_helped =
     contributions list = goal_tools.who_helped.contributions:ListContributions
     member show = goal_tools.who_helped.members:ShowMember
 	changes query = goal_tools.who_helped.changes:QueryChanges
+	cache remove = goal_tools.who_helped.cache:CacheRemove
+	cache show = goal_tools.who_helped.cache:CacheShow
 
 
 [wheel]