Revert "global: remove breadcrumbs"

This reverts commit 1cec836.

docs/conf.py

@@ -319,6 +319,7 @@
     "https://docs.python.org/": None,
     "flask": ("http://flask.pocoo.org/docs/latest/", None),
     "flask_menu": ("https://flask-menu.readthedocs.io/en/latest/", None),
+    "flask_breadcrumbs": ("https://flask-breadcrumbs.readthedocs.io/en/latest/", None),
     "invenio_assets": ("https://invenio-assets.readthedocs.io/en/latest/", None),
 }
 

invenio_theme/__init__.py

@@ -15,9 +15,9 @@
   <https://getbootstrap.com/>`_ HTML, CSS and JS framework.
 - `Error handlers` - for showing user-friendly 401, 402, 404, and 500 error
   pages.
-- `Menu` - for basic site navigation using `Flask-Menu
-  <https://flask-menu.readthedocs.io/>`_
-
+- `Menu and breadcrumbs` - for basic site navigation using `Flask-Menu
+  <https://flask-menu.readthedocs.io/>`_ and `Flask-Breadcrumbs
+  <https://flask-breadcrumbs.readthedocs.io/>`_.
 
 
 Initialization
@@ -151,7 +151,7 @@
 ~~~~~~~~~~~~~~~~~~~~~~~~
 The header template (``invenio_theme/header.html``) is reponsible for rendering
 the navigation bar (including logo, search bar, menu and login/sign up
-buttons) and flash messages
+buttons), flash messages and the breadcrumbs.
 
 Change the template by updating
 :data:`invenio_theme.config.THEME_HEADER_TEMPLATE`.
@@ -165,6 +165,8 @@
 * ``flashmessages`` - Displays small notification messages such as
   "Successfully logged in."
 
+* ``breadcrumbs`` - Displays the breadcrumbs.
+
 Header login section template
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 The header login template (``invenio_theme/header_login.html``) is responsible
@@ -437,6 +439,33 @@ def init_config(app):
 
 To read more about the creation and usage of menus, see :mod:`~flask_menu`.
 
+Breadcrumbs
+~~~~~~~~~~~
+Breadcrumbs works similar to menus, just use the
+:func:`~flask_breadcrumbs.register_breadcrumb` instead.
+
+>>> from flask_breadcrumbs import register_breadcrumb
+
+Using this decorator, you can specify the position of the view in a
+hierarchical manner, as well as the title in the breadcrumb. By default, the
+current breadcrumb is displayed inside the ``page_header`` block in the base
+template.
+
+>>> @app.route('/part1')
+... @register_breadcrumb(app, '.', 'Index')
+... def part1():
+...     return ""
+>>> @app.route('/part2')
+... @register_breadcrumb(app, '.p2', 'Part 2')
+... def part2():
+...     return ""
+>>> @app.route('/part3')
+... @register_breadcrumb(app, '.p2.p3', 'Part 3')
+... def part3():
+...     return ""
+
+To learn more about the usage of breadcrumbs, see :mod:`~flask_breadcrumbs`.
+
 User settings
 ~~~~~~~~~~~~~
 If your module allows your users to configure some settings, you can provide
@@ -459,6 +488,8 @@ def init_config(app):
 
     menu.submenu(".settings.item1").register("settings_item_1", "Item 1", order=2)
     @app.route('/settings/')
+    @register_breadcrumb(app, '.settings', 'Settings page')
+    @register_menu(app, 'settings.item1', 'Item 1', order=2)
     def settings_item_1():
         return render_template('invenio_foo/foo_settings.html')
 

invenio_theme/config.py

@@ -112,6 +112,9 @@
 THEME_SEARCH_ENDPOINT = "/search"
 """The endpoint for the search bar."""
 
+THEME_BREADCRUMB_ROOT_ENDPOINT = ""
+"""The endpoint for the Home view in the breadcrumbs."""
+
 THEME_SITENAME = _("Invenio")
 """The name of the site to be used on the header and as a title."""
 

invenio_theme/ext.py

@@ -9,6 +9,8 @@
 
 """Invenio standard theme."""
 
+from flask import Blueprint
+from flask_breadcrumbs import Breadcrumbs
 from flask_menu import Menu
 
 from . import config
@@ -24,7 +26,9 @@ def __init__(self, app=None, **kwargs):
         :param app: An instance of :class:`~flask.Flask`.
         :param \**kwargs: Keyword arguments are passed to ``init_app`` method.
         """
-        self.app = None
+        self.menu_ext = Menu()
+        self.menu = None
+        self.breadcrumbs = Breadcrumbs()
 
         if app:
             self.app = app
@@ -40,6 +44,42 @@ def init_app(self, app, **kwargs):
         self.menu_ext = Menu(app)
 
         app.context_processor(lambda: {"current_theme_icons": self.icons})
+        # Initialize extensions
+        self.menu_ext.init_app(app)
+        self.menu = app.extensions["menu"]
+        self.breadcrumbs.init_app(app)
+
+        # Register blueprint in order to register template and static folder.
+        app.register_blueprint(
+            Blueprint(
+                "invenio_theme",
+                __name__,
+                template_folder="templates",
+                static_folder="static",
+            )
+        )
+
+        # Register frontpage blueprint if enabled.
+        if app.config["THEME_FRONTPAGE"]:
+            app.register_blueprint(blueprint)
+
+        # Initialize breadcrumbs.
+        item = self.menu.submenu("breadcrumbs")
+        item.register(app.config["THEME_BREADCRUMB_ROOT_ENDPOINT"], _("Home"))
+
+        # Register errors handlers.
+        app.register_error_handler(401, unauthorized)
+        app.register_error_handler(403, insufficient_permissions)
+        app.register_error_handler(404, page_not_found)
+        app.register_error_handler(429, too_many_requests)
+        app.register_error_handler(500, internal_error)
+
+        # Register context processor
+        @app.context_processor
+        def _theme_icon_ctx_processor():
+            from invenio_theme.proxies import current_theme_icons
+
+            return dict(current_theme_icons=current_theme_icons)
 
         # Save reference to self on object
         app.extensions["invenio-theme"] = self

setup.cfg

@@ -28,6 +28,7 @@ python_requires = >=3.7
 zip_safe = False
 install_requires =
     Flask-Menu>=1.0.0
+    Flask-Breadcrumbs>=0.4.0
     invenio-assets>=1.2.7
     invenio-base>=1.2.5
     invenio-i18n>=2.0.0

tests/test_invenio_theme.py

@@ -140,6 +140,7 @@ def test_header_template_blocks(app):
         "brand",
         "navbar_inner",
         "navbar_right",
+        "breadcrumbs",
         "flashmessages",
         "navbar_nav",
         "navbar_search",