1 files changed, 102 insertions, 0 deletions
diff --git a/nikola/plugins/template/jinja.py b/nikola/plugins/template/jinja.py
new file mode 100644
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+++ b/nikola/plugins/template/jinja.py
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+# -*- coding: utf-8 -*-
+
+# Copyright © 2012-2013 Roberto Alsina and others.
+
+# Permission is hereby granted, free of charge, to any
+# person obtaining a copy of this software and associated
+# documentation files (the "Software"), to deal in the
+# Software without restriction, including without limitation
+# the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the
+# Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice
+# shall be included in all copies or substantial portions of
+# the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+# PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
+# OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+"""Jinja template handlers"""
+
+import os
+import json
+from collections import deque
+try:
+    import jinja2
+    from jinja2 import meta
+except ImportError:
+    jinja2 = None  # NOQA
+
+from nikola.plugin_categories import TemplateSystem
+from nikola.utils import makedirs, req_missing
+
+
+class JinjaTemplates(TemplateSystem):
+    """Wrapper for Jinja2 templates."""
+
+    name = "jinja"
+    lookup = None
+    dependency_cache = {}
+
+    def __init__(self):
+        """ initialize Jinja2 wrapper with extended set of filters"""
+        if jinja2 is None:
+            return
+        self.lookup = jinja2.Environment()
+        self.lookup.filters['tojson'] = json.dumps
+        self.lookup.globals['enumerate'] = enumerate
+
+    def set_directories(self, directories, cache_folder):
+        """Createa  template lookup."""
+        if jinja2 is None:
+            req_missing(['jinja2'], 'use this theme')
+        self.lookup.loader = jinja2.FileSystemLoader(directories,
+                                                     encoding='utf-8')
+
+    def render_template(self, template_name, output_name, context):
+        """Render the template into output_name using context."""
+        if jinja2 is None:
+            req_missing(['jinja2'], 'use this theme')
+        template = self.lookup.get_template(template_name)
+        output = template.render(**context)
+        if output_name is not None:
+            makedirs(os.path.dirname(output_name))
+            with open(output_name, 'w+') as output:
+                output.write(output.encode('utf8'))
+        return output
+
+    def render_template_to_string(self, template, context):
+        """ Render template to a string using context. """
+
+        return jinja2.Template(template).render(**context)
+
+    def template_deps(self, template_name):
+        # Cache the lists of dependencies for each template name.
+        if self.dependency_cache.get(template_name) is None:
+            # Use a breadth-first search to find all templates this one
+            # depends on.
+            queue = deque([template_name])
+            visited_templates = set([template_name])
+            deps = []
+            while len(queue) > 0:
+                curr = queue.popleft()
+                source, filename = self.lookup.loader.get_source(self.lookup,
+                                                                 curr)[:2]
+                deps.append(filename)
+                ast = self.lookup.parse(source)
+                dep_names = meta.find_referenced_templates(ast)
+                for dep_name in dep_names:
+                    if (dep_name not in visited_templates
+                            and dep_name is not None):
+                        visited_templates.add(dep_name)
+                        queue.append(dep_name)
+            self.dependency_cache[template_name] = deps
+        return self.dependency_cache[template_name]