first hacky version

.gitignore

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+*.egg-info
+/AUTHORS
+/ChangeLog
+build
+dist

README.rst

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+========================
+OpenStack Summit Counter
+========================
+
+The ``summit count`` plugin for python-openstackclient helps the user
+determine the number of summits they have attended since the beginning
+of their interaction with OpenStack.
+
+Installing
+==========
+
+::
+
+  $ pip install openstack-summit-counter
+
+Using
+=====
+
+::
+
+  $ openstack summit count $first $current
+
+For example, if your first summit was for the "Folsom" series and the
+next summit is for "Rocky"::
+
+  $ openstack summit count folsom rocky
+

requirements.txt

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+# The order of packages is significant, because pip processes them in the order
+# of appearance. Changing the order has an impact on the overall integration
+# process, which may cause wedges in the gate later.
+pbr!=2.1.0,>=2.0.0 # Apache-2.0
+python-openstackclient>=3.12.0  # Apache-2.0

setup.cfg

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+[metadata]
+name = openstack-summit-counter
+summary = OSC Plugin to help compute the number of summits someone has attended.
+description-file =
+    README.rst
+author = Doug Hellmann
+author-email = doug@doughellmann.com
+home-page = https://pypi.python.org/pypi/openstack-summit-counter
+classifier =
+    Environment :: Console
+    Environment :: OpenStack
+    Intended Audience :: Information Technology
+    License :: OSI Approved :: Apache Software License
+    Programming Language :: Python
+    Programming Language :: Python :: 3
+
+[files]
+packages =
+    summit_counter
+
+[entry_points]
+openstack.cli =
+    summit count = summit_counter.main:SummitCount
+    summit list = summit_counter.main:SummitList
+
+[wheel]
+universal = 1

setup.py

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+# Copyright (c) 2013 Hewlett-Packard Development Company, L.P.
+#
+# 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 setuptools
+
+# In python < 2.7.4, a lazy loading of package `pbr` will break
+# setuptools if some other modules registered functions in `atexit`.
+# solution from: http://bugs.python.org/issue15881#msg170215
+try:
+    import multiprocessing  # noqa
+except ImportError:
+    pass
+
+setuptools.setup(
+    setup_requires=['pbr>=2.0.0'],
+    pbr=True)

summit_counter/main.py

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+#    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.
+
+from cliff import lister
+from cliff import show
+
+_SUMMITS = [
+    ('Austin', 'Austin', 'https://wiki.openstack.org/wiki/Design_Summit/Austin'),
+    ('Bexar', 'San Antonio', 'https://wiki.openstack.org/wiki/Design_Summit/Bexar'),
+    ('Cactus', 'Santa Clara', ''),
+    ('Diablo', '', ''),
+    ('Essex', 'Boston', 'https://wiki.openstack.org/wiki/Design_Summit/Essex'),
+    ('Folsom', 'San Francisco', 'https://wiki.openstack.org/wiki/Design_Summit/Folsom'),
+    ('Grizzly', 'San Diego', 'https://wiki.openstack.org/wiki/Design_Summit/Grizzly'),
+    ('Havana', 'Portland', 'https://wiki.openstack.org/wiki/Design_Summit/Havana'),
+    ('Icehouse', 'Hong Kong', 'https://wiki.openstack.org/wiki/Design_Summit/Icehouse'),
+    ('Juno', 'Atlanta', 'https://wiki.openstack.org/wiki/Design_Summit/Juno'),
+    ('Kilo', 'Paris', 'https://wiki.openstack.org/wiki/Design_Summit/Kilo'),
+    ('Liberty', 'Vancouver', 'https://wiki.openstack.org/wiki/Design_Summit/Liberty'),
+    ('Mitaka', 'Tokyo', 'https://www.openstack.org/summit/tokyo-2015/'),
+    ('Newton', 'Austin', 'https://wiki.openstack.org/wiki/Design_Summit/Newton'),
+    ('Ocata', 'Barcelona', 'https://www.openstack.org/summit/barcelona-2016'),
+    ('Pike', 'Boston', 'https://www.openstack.org/summit/boston-2017'),
+    ('Queens', 'Sydney', 'https://www.openstack.org/summit/sydney-2017'),
+    ('Rocky', 'Vancouver', 'https://www.openstack.org/summit/vancouver-2018'),
+]
+
+
+class SummitCount(show.ShowOne):
+
+    # Set the command so that when we run through
+    # python-openstackclient we do not require authentication.
+    auth_required = False
+
+    def get_parser(self, prog_name):
+        parser = super().get_parser(prog_name)
+        choices = [s[0].lower() for s in _SUMMITS]
+        parser.add_argument(
+            'first',
+            help='Your first summit',
+            choices=choices,
+        )
+        parser.add_argument(
+            'current',
+            help='The current summit',
+            choices=choices,
+            nargs='?',
+            default=choices[-1],
+        )
+        return parser
+
+    def _name_to_num(self, name):
+        return ord(name.lower()[0]) - ord('a') + 1
+
+    def take_action(self, parsed_args):
+        first = self._name_to_num(parsed_args.first)
+        current = self._name_to_num(parsed_args.current)
+        return (('Summits',), (current - first + 1,))
+
+
+class SummitList(lister.Lister):
+
+    # Set the command so that when we run through
+    # python-openstackclient we do not require authentication.
+    auth_required = False
+
+    def take_action(self, parsed_args):
+        columns = ('Number', 'Name', 'Location', 'URL')
+        summits = []
+        for i, s in enumerate(_SUMMITS, 1):
+            summits.append((i,) + s)
+        return (columns, summits)