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# vi: ts=4 expandtab
#
# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import re
from Cheetah.Template import Template as CTemplate
from mako.template import Template as MTemplate
from cloudinit import log as logging
from cloudinit import util
LOG = logging.getLogger(__name__)
DEF_RENDERER = (lambda content, params:
CTemplate(content, searchList=[params]).respond())
RENDERERS = {
'mako': lambda content, params: MTemplate(content).render(**params),
'cheetah': DEF_RENDERER,
}
TYPE_MATCHER = re.compile(r"##\s*template:(.*)", re.I)
def detect_template(text):
lines = text.splitlines()
if not lines:
return DEF_RENDERER
line = lines[0]
type_match = TYPE_MATCHER.match(line)
if not type_match:
return DEF_RENDERER
template_type = type_match.group(1).lower().strip()
if template_type not in RENDERERS:
LOG.warn("Unknown template type requested: %s", template_type)
return RENDERERS.get(template_type, DEF_RENDERER)
def render_from_file(fn, params):
return render_string(util.load_file(fn), params)
def render_to_file(fn, outfn, params, mode=0644):
contents = render_from_file(fn, params)
util.write_file(outfn, contents, mode=mode)
def render_string(content, params):
if not params:
params = {}
renderer = detect_template(content)
return renderer(content, params)
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