player allows to address templates with two parameters, category and name. Also it is possible to use set of directories for each layer, in that case player searches templates in each directory. It allows to override templates without changing code. For example form library can define layer `field`:

>> ls ./fields/
.. bool.pt
.. file.pt
...
.. textarea.pt

In your application you can override any of this template by defining new layer for field category:

>> ls ./myproject/fields/
.. bool.pt

Usually top level directory is a category and file in directory is template. For example 'form:view.lt':

`form` - layer category
`view` - template name
`.lt`  - custom pyramid renderer factory

Layer can to be defined with add_layer config directive:

>> config = Configurator()
.. config.include('player')
..
.. config.add_layer('form', path='./path_to_form_dirctory/form/')

form directory can contain any template:

>> ./form/
..   view.pt
..   actions.jinja2

It is possible to use any of this templates as pyramid renderer path:

>> config.add_view(
..     name='view.html', 
..     renderer='form:view.lt')

or :

>> config.add_view(
..     name='actions.html', 
..     renderer='form:actions.lt')

It is possible to run python code before rendering template. There are add_tmpl_filter directive and player.tmpl_filter decorator:

>> def form_actions(context, request):
..     return {'url': ...}

>> config.add_tmpl_filter('form:actions', form_action, name='custom')

or:

>> import player

>> @player.tmpl_filter('form:actions', name='custom')
.. def form_actions(context, request):
..     return {'url': ...}

form_actions function gets call just before rendering template. Layer has to be defined with add_layer directve before registering template filter function.

Any number of layer categories can be registered and any number of layers can be registered in each category. It doesnt require to override all templates from category. For example it is possible to override just view.pt template:

>> config.add_layer('form', 'custom', path='path_to_form_directory_2/form')

and content of this new directory:

>> ./another_path/form/
..   view.jinja2

Now view view.html uses view.jinja2 template. But actions.html stil uses original template.

Another example, if you want customize bool field from ptah.form package all you need is to create some folder, add it as 'fields' layer, and put bool.pt template to this folder, something like that:

>> config.add_layer('fields', 'custom', 'mypackage:fields')

and :

>> .mypackage/fields/
..    bool.pt

player also provides request method render_tmpl. It acccepts path:

..  ${structure: request.render_tmpl('form:actions')

.lt extension is optional in this case.

...

player is offered under the BSD license.