Backport @app.template_test; make the functions in expenses filters/tests

1 files changed, 32 insertions, 0 deletions

diff --git a/app/flask_extend.py b/app/flask_extend.py
new file mode 100644
index 0000000..5096d17
--- /dev/null
+++ b/app/flask_extend.py
@@ -0,0 +1,32 @@
+from flask import Flask as _Flask
+from flask import Blueprint as _Blueprint
+
+if not hasattr(_Flask, 'template_test'):
+# model `template_test` -- introduced with flask-0.10
+    class Flask(_Flask):
+        def template_test(self, name=None):
+            def decorator(f):
+                self.add_template_test(f, name=name)
+                return f
+            return decorator
+
+        def add_template_test(self, f, name=None):
+            self.jinja_env.tests[name or f.__name__] = f
+
+    class Blueprint(_Blueprint):
+        def app_template_test(self, name=None):
+            def decorator(f):
+                self.add_app_template_test(f, name=name)
+                return f
+            return decorator
+
+        def add_app_template_test(self, f, name=None):
+            def register_template(state):
+                state.app.jinja_env.tests[name or f.__name__] = f
+            self.record_once(register_template)
+
+else:
+    Flask = _Flask
+    Blueprint = _Blueprint
+
+del _Flask, _Blueprint