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#!/usr/bin/env python
#
# Copyright 2016 Google Inc.
#
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""
Usage: gn_to_cmake.py <json_file_name>
gn gen out/config --ide=json --json-ide-script=../../gn/gn_to_cmake.py
or
gn gen out/config --ide=json
python gn/gn_to_cmake.py out/config/project.json
"""
import json
import posixpath
import os
import sys
def write_project(project):
def get_base_name(target_name):
base_name = posixpath.basename(target_name)
sep = base_name.rfind(":")
if sep != -1:
base_name = base_name[sep+1:]
return base_name
def get_output_name(target_name, target_properties):
output_name = target_properties.get("output_name", None)
if output_name is None:
output_name = get_base_name(target_name)
output_extension = target_properties.get("output_extension", None)
if output_extension is not None:
output_name = posixpath.splitext(output_name)[0]
if len(output_extension):
output_name += "." + output_extension
return output_name
def get_absolute_path(root_path, path):
if path.startswith("//"):
return root_path + "/" + path[2:]
else:
return path
build_settings = project['build_settings']
root_path = build_settings['root_path']
build_path = os.path.join(root_path, build_settings['build_dir'][2:])
out = open(os.path.join(build_path, 'CMakeLists.txt'), 'w+')
out.write('cmake_minimum_required(VERSION 2.8.8 FATAL_ERROR)\n')
out.write('cmake_policy(VERSION 2.8.8)\n')
for target_name, target_properties in project['targets'].items():
sources = target_properties.get('sources', [])
if not sources:
continue
target_output_name = get_output_name(target_name, target_properties)
out.write('\n')
out.write('add_library(')
out.write(target_output_name)
out.write(' STATIC\n')
for source in sources:
out.write(' "')
out.write(get_absolute_path(root_path, source))
out.write('"\n')
out.write(')\n')
out.write('set_target_properties(')
out.write(target_output_name)
out.write(' PROPERTIES EXCLUDE_FROM_ALL "TRUE")\n')
out.write('set_property(TARGET ')
out.write(target_output_name)
out.write(' APPEND PROPERTY INCLUDE_DIRECTORIES\n')
for include_dir in target_properties.get('include_dirs', []):
out.write(' "')
out.write(get_absolute_path(root_path, include_dir))
out.write('"\n')
out.write(')\n')
out.write('set_target_properties(')
out.write(target_output_name)
out.write(' PROPERTIES COMPILE_DEFINITIONS "')
for define in target_properties.get('defines', []):
out.write(define)
out.write(';')
out.write('")\n')
def main():
if len(sys.argv) != 2:
print('Usage: ' + sys.argv[0] + ' <json_file_name>')
exit(1)
json_path = sys.argv[1]
project = None
with open(json_path, 'r') as json_file:
project = json.loads(json_file.read())
write_project(project)
if __name__ == "__main__":
main()
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