Metadata-Version: 2.1
Name: touchstone
Version: 0.4.1
Summary: IoC framework driven by annotations and type hints
Home-page: https://github.com/gmaybrun/touchstone
Maintainer: gmaybrun@gmail.com
Maintainer-email: gmaybrun@gmail.com
License: UNKNOWN
Platform: UNKNOWN
Classifier: Development Status :: 3 - Alpha
Classifier: Intended Audience :: Developers
Classifier: Natural Language :: English
Classifier: Operating System :: OS Independent
Classifier: License :: OSI Approved :: GNU General Public License v3 (GPLv3)
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Topic :: Software Development :: Libraries :: Application Frameworks
Classifier: Topic :: Software Development :: Object Brokering
Classifier: Topic :: Utilities
Classifier: Typing :: Typed
Requires-Dist: dataclasses
Provides-Extra: dist
Requires-Dist: setuptools (>=38.6.0) ; extra == 'dist'
Requires-Dist: wheel (>=0.31.0) ; extra == 'dist'
Requires-Dist: twine (>=1.11.0) ; extra == 'dist'
Provides-Extra: django
Requires-Dist: django (==2.*) ; extra == 'django'
Provides-Extra: tests
Requires-Dist: pytest (==4.*) ; extra == 'tests'
Requires-Dist: tox (==3.*) ; extra == 'tests'
Requires-Dist: flake8 (==3.6.*) ; extra == 'tests'
Requires-Dist: flake8-tuple ; extra == 'tests'
Requires-Dist: mypy ; extra == 'tests'
Requires-Dist: docutils ; extra == 'tests'

Touchstone
==========

.. contents::
   :depth: 2
   :backlinks: none

What is Touchstone?
-------------------

Touchstone is an annotations-driven Inversion of Control container for
Python 3.6 and above.

Links:

* `GitHub <https://github.com/gmaybrun/touchstone>`__


Learn by Example
----------------

Auto Wiring
~~~~~~~~~~~

.. code:: python

    from touchstone import Container

    class Child:
        pass

    class Parent:
        def __init__(self, child: Child) -> None:
            self.child = child


    container = Container()
    parent = container.make(Parent)

    assert isinstance(parent.child, Child)

Interface Binding
~~~~~~~~~~~~~~~~~

.. code:: python

    from touchstone import Container

    class AbstractChild:
        pass

    class Child(AbstractChild):
        pass

    class Parent:
        def __init__(self, child: AbstractChild) -> None:
            self.child = child


    container = Container()
    container.bind(AbstractChild, Child)
    parent = container.make(Parent)

    assert isinstance(parent.child, Child)

Binding with Factory Methods
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code:: python

    from touchstone import Container

    class Child:
        def __init__(self, name: str) -> None:
            self.name = name

    class Parent:
        def __init__(self, child: Child) -> None:
            self.child = child


    container = Container()
    container.bind(Child, lambda: Child('them'))
    parent = container.make(Parent)

    assert isinstance(parent.child, Child)
    assert parent.child.name == 'them'

Binding Singletons
~~~~~~~~~~~~~~~~~~

.. code:: python

    from touchstone import Container, SINGLETON

    class Child:
        def __init__(self, name: str) -> None:
            self.name = name

    class Parent:
        def __init__(self, child: Child) -> None:
            self.child = child


    container = Container()
    them_child = Child('them')
    container.bind_instance(Child, them_child)
    # Or...
    container.bind(Child, lambda: them_child, lifetime_strategy=SINGLETON)
    parent = container.make(Parent)

    assert isinstance(parent.child, Child)
    assert parent.child is them_child

Contextual Binding
~~~~~~~~~~~~~~~~~~

.. code:: python

    from touchstone import Container

    class Child:
        def __init__(self, name: str) -> None:
            self.name = name

    class Parent:
        def __init__(self, child1: Child, child2: Child) -> None:
            self.child1 = child1
            self.child2 = child2


    container = Container()
    container.bind_contextual(when=Parent, wants=Child, wants_name='child1', give=lambda: Child('her'))
    container.bind_contextual(when=Parent, wants=Child, wants_name='child2', give=lambda: Child('him'))
    parent = container.make(Parent)

    assert isinstance(parent.child1, Child)
    assert isinstance(parent.child2, Child)
    assert parent.child1.name == 'her'
    assert parent.child2.name == 'him'

Django Support
--------------

Now featuring Django support! New in v0.3.0

* Configure your instance of ``touchstone.Container`` however you see fit.
* In your main ``settings.py``, set ``TOUCHSTONE_CONTAINER_GETTER`` to
  the path to a callable that will return the instance of
  ``touchstone.Container`` your app uses.

To get injected properties in your class-based views:

* In your main ``settings.py``, add ``touchstone.django.InjectViewsMiddleware``
  to your ``MIDDLEWARE`` list.
* Use class annotations on your class-based views. Cached Properties will be
  added to your view classes so that they
  automatically resolve using your configured touchstone container. For
  example:

.. code:: python

    class MyView(View):
        something: MyObject
        def get(self, request):
            # You can now access self.something!

To get injected properties in your middleware, you'll need to do a
little more work because we haven't found a good way to hook into
Django's middleware instantiation logic.

.. code:: python

    from touchstone.django import get_container, MagicInjectedProperties
    magic = MagicInjectedProperties(get_container())

    @magic.set_magic_properties
    class MyMixin:
        something: MyObject
        # define your mixin here...
        # You'll be able to use `self.something` from within every instace method.


