1.2a1 (2011-08-24)
==================

Features
--------

- The ``[pshell]`` section in an ini configuration file now treats a
  ``setup`` key as a dotted name that points to a callable that is passed the
  bootstrap environment.  It can mutate the environment as necessary for
  great justice.

- A new configuration setting named ``pyramid.includes`` is now available.
  It is described in the "Environment Variables and ``.ini`` Files Settings"
  narrative documentation chapter.

- Added a ``route_prefix`` argument to the
  ``pyramid.config.Configurator.include`` method.  This argument allows you
  to compose URL dispatch applications together.  See the section entitled
  "Using a Route Prefix to Compose Applications" in the "URL Dispatch"
  narrative documentation chapter.

- Added a ``pyramid.security.NO_PERMISSION_REQUIRED`` constant for use in
  ``permission=`` statements to view configuration.  This constant has a
  value of the string ``__no_permission_required__``.  This string value was
  previously referred to in documentation; now the documentation uses the
  constant.

- Added a decorator-based way to configure a response adapter:
  ``pyramid.response.response_adapter``.  This decorator has the same use as
  ``pyramid.config.Configurator.add_response_adapter`` but it's declarative.

- The ``pyramid.events.BeforeRender`` event now has an attribute named
  ``rendering_val``.  This can be used to introspect the value returned by a
  view in a BeforeRender subscriber.

- New configurator directive: ``pyramid.config.Configurator.add_tween``.
  This directive adds a "tween".  A "tween" is used to wrap the Pyramid
  router's primary request handling function.  This is a feature may be used
  by Pyramid framework extensions, to provide, for example, view timing
  support and as a convenient place to hang bookkeeping code.

  Tweens are further described in the narrative docs section in the Hooks
  chapter, named "Registering Tweens".

- New paster command ``paster ptweens``, which prints the current "tween"
  configuration for an application.  See the section entitled "Displaying
  Tweens" in the Command-Line Pyramid chapter of the narrative documentation
  for more info.

- The Pyramid debug logger now uses the standard logging configuration
  (usually set up by Paste as part of startup).  This means that output from
  e.g. ``debug_notfound``, ``debug_authorization``, etc. will go to the
  normal logging channels.  The logger name of the debug logger will be the
  package name of the *caller* of the Configurator's constructor.

- A new attribute is available on request objects: ``exc_info``.  Its value
  will be ``None`` until an exception is caught by the Pyramid router, after
  which it will be the result of ``sys.exc_info()``.

- ``pyramid.testing.DummyRequest`` now implements the
  ``add_finished_callback`` and ``add_response_callback`` methods.

- New methods of the ``pyramid.config.Configurator`` class:
  ``set_authentication_policy`` and ``set_authorization_policy``.  These are
  meant to be consumed mostly by add-on authors.

- New Configurator method: ``set_root_factory``.

- Pyramid no longer eagerly commits some default configuration statements at
  Configurator construction time, which permits values passed in as
  constructor arguments (e.g. ``authentication_policy`` and
  ``authorization_policy``) to override the same settings obtained via an
  "include".

- Better Mako rendering exceptions via
  ``pyramid.mako_templating.MakoRenderingException``

- New request methods: ``current_route_url``, ``current_route_path``, and
  ``static_path``.

- New functions in ``pyramid.url``: ``current_route_path`` and
  ``static_path``.

- The ``pyramid.request.Request.static_url`` API (and its brethren
  ``pyramid.request.Request.static_path``, ``pyramid.url.static_url``, and
  ``pyramid.url.static_path``) now accept an asbolute filename as a "path"
  argument.  This will generate a URL to an asset as long as the filename is
  in a directory which was previously registered as a static view.
  Previously, trying to generate a URL to an asset using an absolute file
  path would raise a ValueError.

- The ``RemoteUserAuthenticationPolicy ``, ``AuthTktAuthenticationPolicy``,
  and ``SessionAuthenticationPolicy`` constructors now accept an additional
  keyword argument named ``debug``.  By default, this keyword argument is
  ``False``.  When it is ``True``, debug information will be sent to the
  Pyramid debug logger (usually on stderr) when the ``authenticated_userid``
  or ``effective_principals`` method is called on any of these policies.  The
  output produced can be useful when trying to diagnose
  authentication-related problems.

- New view predicate: ``match_param``.  Example: a view added via
  ``config.add_view(aview, match_param='action=edit')`` will be called only
  when the ``request.matchdict`` has a value inside it named ``action`` with
  a value of ``edit``.

Internal
--------

- The Pyramid "exception view" machinery is now implemented as a "tween"
  (``pyramid.tweens.excview_tween_factory``).

- WSGIHTTPException (HTTPFound, HTTPNotFound, etc) now has a new API named
  "prepare" which renders the body and content type when it is provided with
  a WSGI environ.  Required for debug toolbar.

- Once ``__call__`` or ``prepare`` is called on a WSGIHTTPException, the body
  will be set, and subsequent calls to ``__call__`` will always return the
  same body.  Delete the body attribute to rerender the exception body.

- Previously the ``pyramid.events.BeforeRender`` event *wrapped* a dictionary
  (it addressed it as its ``_system`` attribute).  Now it *is* a dictionary
  (it inherits from ``dict``), and it's the value that is passed to templates
  as a top-level dictionary.

- The ``route_url``, ``route_path``, ``resource_url``, ``static_url``, and
  ``current_route_url`` functions in the ``pyramid.url`` package now delegate
  to a method on the request they've been passed, instead of the other way
  around.  The pyramid.request.Request object now inherits from a mixin named
  pyramid.url.URLMethodsMixin to make this possible, and all url/path
  generation logic is embedded in this mixin.

- Refactor ``pyramid.config`` into a package.

- Removed the ``_set_security_policies`` method of the Configurator.

- Moved the ``StaticURLInfo`` class from ``pyramid.static`` to
  ``pyramid.config.views``.

- Move the ``Settings`` class from ``pyramid.settings`` to
  ``pyramid.config.settings``.

- Move the ``OverrideProvider``, ``PackageOverrides``, ``DirectoryOverride``,
  and ``FileOverride`` classes from ``pyramid.asset`` to
  ``pyramid.config.assets``.

Deprecations
------------

- All Pyramid-related deployment settings (e.g. ``debug_all``,
  ``debug_notfound``) are now meant to be prefixed with the prefix
  ``pyramid.``.  For example: ``debug_all`` -> ``pyramid.debug_all``.  The
  old non-prefixed settings will continue to work indefinitely but supplying
  them may eventually print a deprecation warning.  All scaffolds and
  tutorials have been changed to use prefixed settings.

- The ``settings`` dictionary now raises a deprecation warning when you
  attempt to access its values via ``__getattr__`` instead of
  via ``__getitem__``.

Backwards Incompatibilities
---------------------------

- If a string is passed as the ``debug_logger`` parameter to a Configurator,
  that string is considered to be the name of a global Python logger rather
  than a dotted name to an instance of a logger.

- The ``pyramid.config.Configurator.include`` method now accepts only a
  single ``callable`` argument (a sequence of callables used to be
  permitted).  If you are passing more than one ``callable`` to
  ``pyramid.config.Configurator.include``, it will break.  You now must now
  instead make a separate call to the method for each callable.  This change
  was introduced to support the ``route_prefix`` feature of include.

- It may be necessary to more strictly order configuration route and view
  statements when using an "autocommitting" Configurator.  In the past, it
  was possible to add a view which named a route name before adding a route
  with that name when you used an autocommitting configurator.  For example::

    config = Configurator(autocommit=True)
    config.add_view('my.pkg.someview', route_name='foo')
    config.add_route('foo', '/foo')

  The above will raise an exception when the view attempts to add itself.
  Now you must add the route before adding the view::

    config = Configurator(autocommit=True)
    config.add_route('foo', '/foo')
    config.add_view('my.pkg.someview', route_name='foo')

  This won't effect "normal" users, only people who have legacy BFG codebases
  that used an autommitting configurator and possibly tests that use the
  configurator API (the configurator returned by ``pyramid.testing.setUp`` is
  an autocommitting configurator).  The right way to get around this is to
  use a non-autocommitting configurator (the default), which does not have
  these directive ordering requirements.

- The ``pyramid.config.Configurator.add_route`` directive no longer returns a
  route object.  This change was required to make route vs. view
  configuration processing work properly.

Documentation
-------------

- Narrative and API documentation which used the ``route_url``,
  ``route_path``, ``resource_url``, ``static_url``, and ``current_route_url``
  functions in the ``pyramid.url`` package have now been changed to use
  eponymous methods of the request instead.

- Added a section entitled "Using a Route Prefix to Compose Applications" to
  the "URL Dispatch" narrative documentation chapter.

- Added a new module to the API docs: ``pyramid.tweens``.

- Added a "Registering Tweens" section to the "Hooks" narrative chapter.

- Added a "Displaying Tweens" section to the "Command-Line Pyramid" narrative
  chapter.

- Added documentation for the ``pyramid.tweens`` and ``pyramid.includes``
  configuration settings to the "Environment Variables and ``.ini`` Files
  Settings" chapter.

- Added a Logging chapter to the narrative docs (based on the Pylons logging
  docs, thanks Phil).

- Added a Paste chapter to the narrative docs (moved content from the Project
  chapter).

- Added the ``pyramid.interfaces.IDict`` interface representing the methods
  of a dictionary, for documentation purposes only (IMultiDict and
  IBeforeRender inherit from it).

- All tutorials now use - The ``route_url``, ``route_path``,
  ``resource_url``, ``static_url``, and ``current_route_url`` methods of the
  request rather than the function variants imported from ``pyramid.url``.

- The ZODB wiki tutorial now uses the ``pyramid_zodbconn`` package rather
  than the ``repoze.zodbconn`` package to provide ZODB integration.

Dependency Changes
------------------

- Pyramid now relies on PasteScript >= 1.7.4.  This version contains a
  feature important for allowing flexible logging configuration.

Scaffolds
----------

- All scaffolds now use the ``pyramid_tm`` package rather than the
  ``repoze.tm2`` middleware to manage transaction management.

- The ZODB scaffold now uses the ``pyramid_zodbconn`` package rather than the
  ``repoze.zodbconn`` package to provide ZODB integration.

- All scaffolds now use the ``pyramid_debugtoolbar`` package rather than the
  ``WebError`` package to provide interactive debugging features.

- Projects created via a scaffold no longer depend on the ``WebError``
  package at all; configuration in the ``production.ini`` file which used to
  require its ``error_catcher`` middleware has been removed.  Configuring
  error catching / email sending is now the domain of the ``pyramid_exclog``
  package (see https://docs.pylonsproject.org/projects/pyramid_exclog/dev/).

Bug Fixes
---------

- Fixed an issue with the default renderer not working at certain times.  See
  https://github.com/Pylons/pyramid/issues/249

