Started work on implementing blueprint based template loading

flask/app.py

@@ -16,8 +16,6 @@
 from datetime import timedelta, datetime
 from itertools import chain
 
-from jinja2 import Environment
-
 from werkzeug import ImmutableDict
 from werkzeug.routing import Map, Rule
 from werkzeug.exceptions import HTTPException, InternalServerError, \
@@ -31,7 +29,7 @@
 from .globals import _request_ctx_stack, request
 from .session import Session, _NullSession
 from .module import _ModuleSetupState
-from .templating import _DispatchingJinjaLoader, \
+from .templating import DispatchingJinjaLoader, Environment, \
     _default_template_ctx_processor
 from .signals import request_started, request_finished, got_request_exception
 
@@ -280,6 +278,13 @@ def __init__(self, import_name, static_path=None):
         #: .. versionadded:: 0.5
         self.modules = {}
 
+        #: all the attached blueprints in a directory by name.  Blueprints
+        #: can be attached multiple times so this dictionary does not tell
+        #: you how often they got attached.
+        #:
+        #: .. versionadded:: 0.7
+        self.blueprints = {}
+
         #: a place where extensions can store application specific state.  For
         #: example this is where an extension could store database engines and
         #: similar things.  For backwards compatibility extensions should register
@@ -386,7 +391,7 @@ def create_jinja_environment(self):
         options = dict(self.jinja_options)
         if 'autoescape' not in options:
             options['autoescape'] = self.select_jinja_autoescape
-        rv = Environment(loader=self.create_jinja_loader(), **options)
+        rv = Environment(self, **options)
         rv.globals.update(
             url_for=url_for,
             get_flashed_messages=get_flashed_messages
@@ -400,7 +405,7 @@ def create_jinja_loader(self):
 
         .. versionadded:: 0.7
         """
-        return _DispatchingJinjaLoader(self)
+        return DispatchingJinjaLoader(self)
 
     def init_jinja_globals(self):
         """Deprecated.  Used to initialize the Jinja2 globals.
@@ -537,6 +542,10 @@ def register_module(self, module, **options):
         of this function are the same as the ones for the constructor of the
         :class:`Module` class and will override the values of the module if
         provided.
+
+        .. versionchanged:: 0.7
+           The module system was deprecated in favor for the blueprint
+           system.
         """
         if not self.enable_modules:
             raise RuntimeError('Module support was disabled but code '
@@ -557,6 +566,19 @@ def register_module(self, module, **options):
         for func in module._register_events:
             func(state)
 
+    def register_blueprint(self, blueprint, **options):
+        """Registers a blueprint on the application.
+
+        .. versionadded:: 0.7
+        """
+        if blueprint.name in self.blueprints:
+            assert self.blueprints[blueprint.name] is blueprint, \
+                'A blueprint\'s name collision ocurred between %r and ' \
+                '%r.' % (blueprint, self.blueprints[blueprint.name])
+        else:
+            self.blueprints[blueprint.name] = blueprint
+        blueprint.register(self, **options)
+
     def add_url_rule(self, rule, endpoint=None, view_func=None, **options):
         """Connects a URL rule.  Works exactly like the :meth:`route`
         decorator.  If a view_func is provided it will be registered with the

flask/templating.py

@@ -9,7 +9,8 @@
     :license: BSD, see LICENSE for more details.
 """
 import posixpath
-from jinja2 import BaseLoader, TemplateNotFound
+from jinja2 import BaseLoader, Environment as BaseEnvironment, \
+     TemplateNotFound
 
 from .globals import _request_ctx_stack
 from .signals import template_rendered
@@ -28,7 +29,25 @@ def _default_template_ctx_processor():
     )
 
 
-class _DispatchingJinjaLoader(BaseLoader):
+class Environment(BaseEnvironment):
+    """Works like a regular Jinja2 environment but has some additional
+    knowledge of how Flask's blueprint works so that it can prepend the
+    name of the blueprint to referenced templates if necessary.
+    """
+
+    def __init__(self, app, **options):
+        if 'loader' not in options:
+            options['loader'] = app.create_jinja_loader()
+        BaseEnvironment.__init__(self, **options)
+        self.app = app
+
+    def join_path(self, template, parent):
+        if template and template[0] == ':':
+            template = parent.split(':', 1)[0] + template
+        return template
+
+
+class DispatchingJinjaLoader(BaseLoader):
     """A loader that looks for templates in the application and all
     the module folders.
     """
@@ -37,31 +56,50 @@ def __init__(self, app):
         self.app = app
 
     def get_source(self, environment, template):
-        template = posixpath.normpath(template)
-        if template.startswith('../'):
-            raise TemplateNotFound(template)
+        # newstyle template support.  blueprints are explicit and no further
+        # magic is involved.  If the template cannot be loaded by the
+        # blueprint loader it just gives up, no further steps involved.
+        if ':' in template:
+            blueprint_name, local_template = template.split(':', 1)
+            local_template = posixpath.normpath(local_template)
+            blueprint = self.app.blueprints.get(blueprint_name)
+            if blueprint is None:
+                raise TemplateNotFound(template)
+            loader = blueprint.jinja_loader
+            if loader is not None:
+                return loader.get_source(environment, local_template)
+
+        # if modules are enabled we call into the old style template lookup
+        # and try that before we go with the real deal.
         loader = None
         try:
-            module, name = template.split('/', 1)
+            module, name = posixpath.normpath(template).split('/', 1)
             loader = self.app.modules[module].jinja_loader
-        except (ValueError, KeyError):
+        except (ValueError, KeyError, TemplateNotFound):
             pass
-        # if there was a module and it has a loader, try this first
-        if loader is not None:
-            try:
+        try:
+            if loader is not None:
                 return loader.get_source(environment, name)
-            except TemplateNotFound:
-                pass
-        # fall back to application loader if module failed
+        except TemplateNotFound:
+            pass
+
+        # at the very last, load templates from the environment
         return self.app.jinja_loader.get_source(environment, template)
 
     def list_templates(self):
-        result = self.app.jinja_loader.list_templates()
+        result = set(self.app.jinja_loader.list_templates())
+
         for name, module in self.app.modules.iteritems():
             if module.jinja_loader is not None:
                 for template in module.jinja_loader.list_templates():
-                    result.append('%s/%s' % (name, template))
-        return result
+                    result.add('%s/%s' % (name, template))
+
+        for name, blueprint in self.app.blueprints.iteritems():
+            if blueprint.jinja_loader is not None:
+                for template in blueprint.jinja_loader.list_templates():
+                    result.add('%s:%s' % (name, template))
+
+        return list(result)
 
 
 def _render(template, context, app):
@@ -81,6 +119,8 @@ def render_template(template_name, **context):
     """
     ctx = _request_ctx_stack.top
     ctx.app.update_template_context(context)
+    if template_name[:1] == ':':
+        template_name = ctx.request.blueprint + template_name
     return _render(ctx.app.jinja_env.get_template(template_name),
                    context, ctx.app)
 

flask/wrappers.py

@@ -62,9 +62,17 @@ def endpoint(self):
     @property
     def module(self):
         """The name of the current module"""
-        if self.url_rule and '.' in self.url_rule.endpoint:
+        if self.url_rule and \
+           ':' not in self.url_rule.endpoint and \
+           '.' in self.url_rule.endpoint:
             return self.url_rule.endpoint.rsplit('.', 1)[0]
 
+    @property
+    def blueprint(self):
+        """The name of the current blueprint"""
+        if self.url_rule and ':' in self.url_rule.endpoint:
+            return self.url_rule.endpoint.split(':', 1)[0]
+
     @cached_property
     def json(self):
         """If the mimetype is `application/json` this will contain the

tests/flask_tests.py

@@ -1111,6 +1111,7 @@ def error():
 
     def test_templates_and_static(self):
         app = moduleapp
+        app.debug = True
         c = app.test_client()
 
         rv = c.get('/')