Convert fabfile to tasks.py for invoke

tasks.py

@@ -0,0 +1,46 @@
+# -*- coding: utf-8; -*-
+################################################################################
+#
+#  Rattail -- Retail Software Framework
+#  Copyright © 2010-2019 Lance Edgar
+#
+#  This file is part of Rattail.
+#
+#  Rattail is free software: you can redistribute it and/or modify it under the
+#  terms of the GNU General Public License as published by the Free Software
+#  Foundation, either version 3 of the License, or (at your option) any later
+#  version.
+#
+#  Rattail is distributed in the hope that it will be useful, but WITHOUT ANY
+#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+#  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+#  details.
+#
+#  You should have received a copy of the GNU General Public License along with
+#  Rattail.  If not, see <http://www.gnu.org/licenses/>.
+#
+################################################################################
+"""
+Tasks for rattail-cognitive
+"""
+
+from __future__ import unicode_literals, absolute_import
+
+import os
+import shutil
+
+from invoke import task
+
+
+here = os.path.abspath(os.path.dirname(__file__))
+exec(open(os.path.join(here, 'rattail_cognitive', '_version.py')).read())
+
+
+@task
+def release(ctx):
+    """
+    Release a new version of `rattail`.
+    """
+    shutil.rmtree('rattail_cognitive.egg-info')
+    ctx.run('python setup.py sdist --formats=gztar')
+    ctx.run('twine upload dist/rattail_cognitive-{}.tar.gz'.format(__version__))