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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
import jinja2
from jinja2 import Template as JTemplate
from cloudinit import log as logging
from cloudinit import util
LOG = logging.getLogger(__name__)
DEF_RENDERER = 'cheetah'
RENDERERS = {
'jinja': (lambda content, params:
JTemplate(content,
undefined=jinja2.StrictUndefined,
trim_blocks=True).render(**params)),
'cheetah': (lambda content, params:
CTemplate(content, searchList=[params]).respond()),
}
TYPE_MATCHER = re.compile(r"##\s*template:(.*)", re.I)
def detect_template(text):
try:
ident, rest = text.split("\n", 1)
except ValueError:
return (DEF_RENDERER, text)
else:
type_match = TYPE_MATCHER.match(ident)
if not type_match:
return (DEF_RENDERER, text)
template_type = type_match.group(1).lower().strip()
if template_type not in RENDERERS:
raise ValueError("Unknown template type '%s' requested"
% template_type)
else:
return (template_type, rest)
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 = {}
try:
renderer, content = detect_template(content)
except ValueError:
renderer = DEF_RENDERER
LOG.debug("Rendering %s using renderer '%s'", content, renderer)
return RENDERERS[renderer](content, params)
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