Initial support for basic WooCommerce integration

can export products to WooCommerce, plus maintain local cache, and track Woo ID
for each rattail product

rattail_woocommerce/config.py

@@ -0,0 +1,52 @@
+# -*- coding: utf-8; -*-
+################################################################################
+#
+#  Rattail -- Retail Software Framework
+#  Copyright © 2010-2021 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/>.
+#
+################################################################################
+"""
+Rattail/WooCommerce Config
+"""
+
+
+def woocommerce_url(config, require=False, **kwargs):
+    """
+    Returns the base URL for the WooCommerce website.  Note that this URL will
+    *not* have a trailing slash.
+    """
+    args = ['woocommerce', 'url']
+    if require:
+        url = config.require(*args, **kwargs)
+        return url.rstrip('/')
+    else:
+        url = config.get(*args, **kwargs)
+        if url:
+            return url.rstrip('/')
+
+
+def woocommerce_admin_product_url(config, product_id, base_url=None,
+                                  require=False):
+    """
+    Returns the WooCommerce Admin URL for the given product.
+    """
+    if not base_url:
+        base_url = woocommerce_url(config, require=require)
+    if base_url:
+        return '{}/wp-admin/post.php?post={}&action=edit'.format(
+            base_url, product_id)