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#
# Asterisk -- An open source telephony toolkit.
#
# Copyright (C) 2013, Digium, Inc.
#
# David M. Lee, II <dlee@digium.com>
#
# See http://www.asterisk.org for more information about
# the Asterisk project. Please do not directly contact
# any of the maintainers of this project for assistance;
# the project provides a web site, mailing lists and IRC
# channels for your use.
#
# This program is free software, distributed under the terms of
# the GNU General Public License Version 2. See the LICENSE file
# at the top of the source tree.
#
import filecmp
import os.path
import pystache
import shutil
import tempfile
class Transform(object):
"""Transformation for template to code.
"""
def __init__(self, template_file, dest_file_template_str, overwrite=True):
"""Ctor.
@param template_file: Filename of the mustache template.
@param dest_file_template_str: Destination file name. This is a
mustache template, so each resource can write to a unique file.
@param overwrite: If True, destination file is ovewritten if it exists.
"""
template_str = unicode(open(template_file, "r").read())
self.template = pystache.parse(template_str)
dest_file_template_str = unicode(dest_file_template_str)
self.dest_file_template = pystache.parse(dest_file_template_str)
self.overwrite = overwrite
def render(self, renderer, model, dest_dir):
"""Render a model according to this transformation.
@param render: Pystache renderer.
@param model: Model object to render.
@param dest_dir: Destination directory to write generated code.
"""
dest_file = pystache.render(self.dest_file_template, model)
dest_file = os.path.join(dest_dir, dest_file)
dest_exists = os.path.exists(dest_file)
if dest_exists and not self.overwrite:
return
with tempfile.NamedTemporaryFile() as out:
out.write(renderer.render(self.template, model))
out.flush()
if not dest_exists or not filecmp.cmp(out.name, dest_file):
print "Writing %s" % dest_file
shutil.copyfile(out.name, dest_file)
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