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"""Mako template handlers"""
import os
import shutil
from mako import util, lexer
from mako.lookup import TemplateLookup
from nikola.plugin_categories import TemplateSystem
class MakoTemplates(TemplateSystem):
"""Wrapper for Mako templates."""
name = "mako"
lookup = None
cache = {}
def get_deps(self, filename):
text = util.read_file(filename)
lex = lexer.Lexer(text=text, filename=filename)
lex.parse()
deps = []
for n in lex.template.nodes:
if getattr(n, 'keyword', None) == "inherit":
deps.append(n.attributes['file'])
# TODO: include tags are not handled
return deps
def set_directories(self, directories):
"""Createa template lookup."""
cache_dir = os.path.join('cache', '.mako.tmp')
if os.path.exists(cache_dir):
shutil.rmtree(cache_dir)
self.lookup = TemplateLookup(
directories=directories,
module_directory=cache_dir,
output_encoding='utf-8',
)
def render_template(self, template_name, output_name, context):
"""Render the template into output_name using context."""
template = self.lookup.get_template(template_name)
data = template.render_unicode(**context)
if output_name is not None:
try:
os.makedirs(os.path.dirname(output_name))
except:
pass
with open(output_name, 'w+') as output:
output.write(data)
return data
def template_deps(self, template_name):
"""Returns filenames which are dependencies for a template."""
# We can cache here because depedencies should
# not change between runs
if self.cache.get(template_name, None) is None:
template = self.lookup.get_template(template_name)
dep_filenames = self.get_deps(template.filename)
deps = [template.filename]
for fname in dep_filenames:
deps += self.template_deps(fname)
self.cache[template_name] = tuple(deps)
return list(self.cache[template_name])
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