1 files changed, 91 insertions, 0 deletions
diff --git a/compass-deck/utils/flags.py b/compass-deck/utils/flags.py
new file mode 100644
index 0000000..a3169f5
--- /dev/null
+++ b/compass-deck/utils/flags.py
@@ -0,0 +1,91 @@
+# Copyright 2014 Huawei Technologies Co. Ltd
+#
+# 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.
+
+"""Module to load flags.
+
+   .. moduleauthor:: Xiaodong Wang <xiaodongwang@huawei.com>
+"""
+import sys
+
+from optparse import OptionParser
+
+
+class Flags(object):
+    """Class to store flags."""
+
+    PARSER = OptionParser()
+    PARSED_OPTIONS = None
+
+    @classmethod
+    def parse_args(cls):
+        """parse args."""
+        (options, argv) = Flags.PARSER.parse_args()
+        sys.argv = [sys.argv[0]] + argv
+        Flags.PARSED_OPTIONS = options
+
+    def __getattr__(self, name):
+        if Flags.PARSED_OPTIONS and hasattr(Flags.PARSED_OPTIONS, name):
+            return getattr(Flags.PARSED_OPTIONS, name)
+
+        for option in Flags.PARSER.option_list:
+            if option.dest == name:
+                return option.default
+
+        raise AttributeError('Option instance has no attribute %s' % name)
+
+    def __setattr__(self, name, value):
+        if Flags.PARSED_OPTIONS and hasattr(Flags.PARSED_OPTIONS, name):
+            setattr(Flags.PARSED_OPTIONS, name, value)
+            return
+
+        for option in Flags.PARSER.option_list:
+            if option.dest == name:
+                option.default = value
+                return
+
+        object.__setattr__(self, name, value)
+
+
+OPTIONS = Flags()
+
+
+def init():
+    """Init flag parsing."""
+    OPTIONS.parse_args()
+
+
+def add(flagname, **kwargs):
+    """Add a flag name and its setting.
+
+    :param flagname: flag name declared in cmd as --<flagname>=...
+    :type flagname: str
+    """
+    Flags.PARSER.add_option('--%s' % flagname,
+                            dest=flagname, **kwargs)
+
+
+def add_bool(flagname, default=True, **kwargs):
+    """Add a bool flag name and its setting.
+
+    :param flagname: flag name declared in cmd as --[no]<flagname>.
+    :type flagname: str
+    :param default: default value
+    :type default: bool
+    """
+    Flags.PARSER.add_option('--%s' % flagname,
+                            dest=flagname, default=default,
+                            action="store_true", **kwargs)
+    Flags.PARSER.add_option('--no%s' % flagname,
+                            dest=flagname,
+                            action="store_false", **kwargs)