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#!/usr/bin/env python
# Copyright (c) 2011 Google Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
#     * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import os
import re
import sys

GYPI_TEMPLATE = """{
    'variables': {
        '%s': [
%s
        ]
    }
}""" 

def find_source_code():
    source_code_regexp = re.compile(r'\.(cpp|h|m|mm)$')

    collected_files = []
    for directory_path, directory_names, file_names in os.walk('.'):
        for file_name in file_names:
            if source_code_regexp.search(file_name):
                relative_path = os.path.join(directory_path, file_name)
                collected_files.append(os.path.relpath(relative_path, '.'))

    return collected_files

def build_file_line(file_name, indent):
    return indent +  "'%s'," % file_name

def build_file_list(source_code, indent):
    return '\n'.join([build_file_line(file_name, indent) for file_name in sorted(source_code)])

def build_gypi(project):
    key = project.lower() + '_files'
    value = build_file_list(find_source_code(), '    ' * 3)
    return GYPI_TEMPLATE % (key, value)

def main():
    if len(sys.argv) < 2:
        print 'Usage: %s project_name' % sys.argv[0]
        return
    print build_gypi(sys.argv[1])

if __name__ == "__main__":
    main()