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__init__.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2013 CERN.
##
## Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## Invenio is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""
invenio.ext.breadcrumb
----------------------
Depends on `invenio.ext.menu` extension.
"""
from werkzeug import LocalProxy
from flask import current_app
from invenio.base.globals import current_function, current_blueprint
from invenio.ext.menu import MenuAlchemy, current_menu
class BreadcrumbAlchemy(MenuAlchemy):
"""
Breadcrumb organizer for Invenio.
"""
config = {}
def init_app(self, app, *args, **kwargs):
super(self.__class__, self).init_app(app, *args, **kwargs)
app.config.setdefault('BREADCRUMB_ROOT', 'breadcrumbs')
app.context_processor(BreadcrumbAlchemy._breadcrumbs_context_processor)
# Proxy functions
@staticmethod
def _breadcrumb_root_path():
"""
Backend function for breadcrumb_root_path proxy.
"""
return current_app.config.get('BREADCRUMB_ROOT')
@staticmethod
def _current_path():
"""
Determines current location in menu hierarchy.
Backend function for current_path proxy.
"""
# str(...) because __breadcrumb__ can hold a LocalProxy
if hasattr(current_function, '__breadcrumb__'):
return str(getattr(current_function, '__breadcrumb__', ''))
if current_blueprint:
return BreadcrumbAlchemy.blueprint_get_path(current_blueprint)
return ''
@staticmethod
def _breadcrumbs():
"""
Returns list of breadcrumbs.
Backend function for breadcrumbs proxy.
"""
# Construct breadcrumbs using their dynamic lists
breadcrumb_list = []
for entry in current_menu.list_path(breadcrumb_root_path, current_path) or []:
breadcrumb_list += entry.dynamic_list
return breadcrumb_list
@staticmethod
def _breadcrumbs_context_processor():
"""Adds variable 'breadcrumbs' to template context.
It contains the list of menu entries to render as breadcrumbs.
"""
return dict(breadcrumbs=breadcrumbs)
@staticmethod
def blueprint_get_path(blueprint):
"""
:return: Path to root of bluerpint's branch.
"""
return str(getattr(
blueprint,
'__breadcrumb__',
breadcrumb_root_path + '.' + blueprint.name))
@staticmethod
def default_breadcrumb_root(blueprint, path):
"""Registers the default breadcrumb path
for all endpoints in this blueprint.
:param path: Path in the menu hierarchy.
Should start with '.' to be relative to breadcrumb root.
"""
if path.startswith('.'):
# Path relative to breadcrumb root
bl_path = LocalProxy(lambda:
(breadcrumb_root_path + path).strip('.'))
else:
bl_path = path
blueprint.__breadcrumb__ = bl_path
@staticmethod
def register_breadcrumb(blueprint, path, text,
endpoint_arguments_constructor=None,
dynamic_list_constructor=None):
"""Decorate endpoints that should be displayed as a breadcrumb.
:param blueprint: Blueprint which owns the function.
:param path: Path to this item in menu hierarchy
("breadcrumbs." is automatically added).
:param text: Text displayed as link.
:param order: Index of item among other items in the same menu.
:param endpoint_arguments_constructor: Function returning dict of
arguments passed to url_for when creating the link.
:param dynamic_list_constructor: Function returning a list of
breadcrumbs to be displayed by this item. Every object should
have 'text' and 'url' properties/dict elements.
"""
# Resolve blueprint-relative paths
if path.startswith('.'):
def _evaluate_path():
bl_path = BreadcrumbAlchemy.blueprint_get_path(blueprint)
return (bl_path + path).strip('.')
func_path = LocalProxy(_evaluate_path)
else:
func_path = path
# Get standard menu decorator
menu_decorator = MenuAlchemy.register_menu(
blueprint, func_path, text, 0,
endpoint_arguments_constructor=endpoint_arguments_constructor,
dynamic_list_constructor=dynamic_list_constructor)
def breadcrumb_decorator(f):
"""Applies standard menu decorator and assign breadcrumb."""
f.__breadcrumb__ = func_path
return menu_decorator(f)
return breadcrumb_decorator
# Proxies
breadcrumb_root_path = LocalProxy(BreadcrumbAlchemy._breadcrumb_root_path)
current_path = LocalProxy(BreadcrumbAlchemy._current_path)
breadcrumbs = LocalProxy(BreadcrumbAlchemy._breadcrumbs)
# Decorators and API
default_breadcrumb_root = BreadcrumbAlchemy.default_breadcrumb_root
register_breadcrumb = BreadcrumbAlchemy.register_breadcrumb

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