# HG changeset patch
# User Daniel Bentley <dbentley@google.com>
# Date 1237536719 0
# Node ID 596dbffbffe0f86efeeaf8526edf84ef040f8ad6
# Parent  832a1e80eee0a23ddd22620929718e05baca36b9
A script for writing the application name into an app.yaml based on an app.yaml.template.

My first check-in.  I apologize if I forgot, overlooked, or just plum messed something up.  I'm sure I have.  I'll fix it, and appreciate any review you can give.

diff -r 832a1e80eee0 -r 596dbffbffe0 scripts/gen_app_yaml.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/gen_app_yaml.py	Fri Mar 20 08:11:59 2009 +0000
@@ -0,0 +1,91 @@
+#! /usr/bin/python2.5
+
+# Copyright 2009 the Melange authors.
+#
+# 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.
+
+"""A script to generate the app.yaml from the template with an application
+name filled in.
+
+Usage:
+  gen_app_yaml.py [-f] APPLICATION_NAME
+
+Arguments:
+  APPLICATION_NAME: the name to use for the application (no underscores)
+
+Flags:
+  -f:  overwrite an existing app.yaml (default=false)
+"""
+
+from __future__ import with_statement
+
+__authors__ = [
+    # alphabetical order by last name, please
+    '"Dan Bentley" <dbentley@google.com>',
+    ]
+
+import os
+import sys
+
+
+def generateAppYaml(application_name, force=False):
+  """Generate the app.yaml file.
+
+  Args:
+    application_name: str, the name to write into the application filed
+    force: bool, whether to overwrite an existing app.yaml
+  """
+  scripts_directory = os.path.dirname(__file__)
+  app_dir = os.path.abspath(os.path.join(scripts_directory, '../app'))
+  template_path = os.path.join(app_dir, 'app.yaml.template')
+  app_yaml_path = os.path.join(app_dir, 'app.yaml')
+  if not os.path.exists(template_path):
+    sys.exit("Template file %s non-existent. Corrupt client?" % template_path)
+  if os.path.exists(app_yaml_path):
+    if not force:
+      sys.exit("%s exists; exiting. To overwrite, pass -f on the command-line"
+               % app_yaml_path)
+  with open(template_path) as infile:
+    template_contents = infile.read()
+  app_yaml_contents = template_contents.replace(
+      '# application: FIXME',
+      'application: '+ application_name)
+  with open(app_yaml_path, 'w') as outfile:
+    outfile.write(app_yaml_contents)
+  # TODO(dbentley): should this be done via logging?
+  print "Wrote application name %s to %s." % (application_name, app_yaml_path)
+
+
+def usage(msg):
+  """Print an error message and the usage of the program; then quit.
+  """
+  sys.exit('Error: %s\n\n%s' % (msg, __doc__))
+
+
+def main(args):
+  args = args[1:] # strip off the binary name
+  if not args:
+    usage("No arguments supplied.")
+  if args[0] == '-f':
+    force = True
+    args = args[1:]
+  else:
+    force = False
+  if len(args) != 1:
+    usage("No application name supplied.")
+  application_name = args[0]
+  generateAppYaml(application_name, force=force)
+
+
+if __name__ == '__main__':
+  main(sys.argv)