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#!/usr/bin/env python2.7
# Copyright 2015 gRPC 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.
"""Simple Mako renderer.
Just a wrapper around the mako rendering library.
"""
import getopt
import imp
import os
import cPickle as pickle
import shutil
import sys
from mako.lookup import TemplateLookup
from mako.runtime import Context
from mako.template import Template
import bunch
import yaml
# Imports a plugin
def import_plugin(name):
_, base_ex = os.path.split(name)
base, _ = os.path.splitext(base_ex)
with open(name, 'r') as plugin_file:
plugin_code = plugin_file.read()
plugin_module = imp.new_module(base)
exec plugin_code in plugin_module.__dict__
return plugin_module
def out(msg):
print >> sys.stderr, msg
def showhelp():
out('mako-renderer.py [-o out] [-m cache] [-P preprocessed_input] [-d dict] [-d dict...]'
' [-t template] [-w preprocessed_output]')
def main(argv):
got_input = False
module_directory = None
preprocessed_output = None
dictionary = {}
json_dict = {}
got_output = False
plugins = []
output_name = None
got_preprocessed_input = False
output_merged = None
try:
opts, args = getopt.getopt(argv, 'hM:m:d:o:p:t:P:w:')
except getopt.GetoptError:
out('Unknown option')
showhelp()
sys.exit(2)
for opt, arg in opts:
if opt == '-h':
out('Displaying showhelp')
showhelp()
sys.exit()
elif opt == '-o':
if got_output:
out('Got more than one output')
showhelp()
sys.exit(3)
got_output = True
output_name = arg
elif opt == '-m':
if module_directory is not None:
out('Got more than one cache directory')
showhelp()
sys.exit(4)
module_directory = arg
elif opt == '-M':
if output_merged is not None:
out('Got more than one output merged path')
showhelp()
sys.exit(5)
output_merged = arg
elif opt == '-P':
assert not got_preprocessed_input
assert json_dict == {}
sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]), 'plugins')))
with open(arg, 'r') as dict_file:
dictionary = pickle.load(dict_file)
got_preprocessed_input = True
elif opt == '-d':
assert not got_preprocessed_input
with open(arg, 'r') as dict_file:
bunch.merge_json(json_dict, yaml.load(dict_file.read()))
elif opt == '-p':
plugins.append(import_plugin(arg))
elif opt == '-w':
preprocessed_output = arg
if not got_preprocessed_input:
for plugin in plugins:
plugin.mako_plugin(json_dict)
if output_merged:
with open(output_merged, 'w') as yaml_file:
yaml_file.write(yaml.dump(json_dict))
for k, v in json_dict.items():
dictionary[k] = bunch.to_bunch(v)
if preprocessed_output:
with open(preprocessed_output, 'w') as dict_file:
pickle.dump(dictionary, dict_file)
cleared_dir = False
for arg in args:
got_input = True
with open(arg) as f:
srcs = list(yaml.load_all(f.read()))
for src in srcs:
if isinstance(src, basestring):
assert len(srcs) == 1
template = Template(src,
filename=arg,
module_directory=module_directory,
lookup=TemplateLookup(directories=['.']))
with open(output_name, 'w') as output_file:
template.render_context(Context(output_file, **dictionary))
else:
# we have optional control data: this template represents
# a directory
if not cleared_dir:
if not os.path.exists(output_name):
pass
elif os.path.isfile(output_name):
os.unlink(output_name)
else:
shutil.rmtree(output_name, ignore_errors=True)
cleared_dir = True
items = []
if 'foreach' in src:
for el in dictionary[src['foreach']]:
if 'cond' in src:
args = dict(dictionary)
args['selected'] = el
if not eval(src['cond'], {}, args):
continue
items.append(el)
assert items
else:
items = [None]
for item in items:
args = dict(dictionary)
args['selected'] = item
item_output_name = os.path.join(
output_name, Template(src['output_name']).render(**args))
if not os.path.exists(os.path.dirname(item_output_name)):
os.makedirs(os.path.dirname(item_output_name))
template = Template(src['template'],
filename=arg,
module_directory=module_directory,
lookup=TemplateLookup(directories=['.']))
with open(item_output_name, 'w') as output_file:
template.render_context(Context(output_file, **args))
if not got_input and not preprocessed_output:
out('Got nothing to do')
showhelp()
if __name__ == '__main__':
main(sys.argv[1:])
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