Adding a custom 'jinja2template' filter.

randalldegges-okta-2 · randalldegges-okta-2 · commit b1a34b46a628 · 2012-07-12T21:23:19.000-07:00
This allows us to run static assets through Jinja2's templateing engine (using
Flask's standard template contexts).
diff --git a/src/filter.py b/src/filter.py
@@ -0,0 +1,26 @@
+"""Flask specific filters.
+
+For those to be registered automatically, make sure the main flask-assets
+namespace imports this file.
+"""
+
+
+from flask.templating import render_template_string
+from webassets.filter import Filter, register_filter
+
+
+class Jinja2TemplateFilter(Filter):
+    """Will compile all source files as Jinja2 temlates using the standard
+    Flask contexts.
+    """
+    name = 'jinja2template'
+
+    def __init__(self, context=None):
+        super(Jinja2TemplateFilter, self).__init__()
+        self.context = context or {}
+
+    def input(self, _in, out, source_path, output_path, **kw):
+        out.write(render_template_string(_in.read(), **self.context))
+
+
+register_filter(Jinja2TemplateFilter)
