Use canonical URL from html_baseurl (#1003)

This is in sphinx itself now https://www.sphinx-doc.org/en/master/usage/configuration.html#confval-html_baseurl,
https://github.com/sphinx-doc/sphinx/blob/e886cc21710e23bc53af83d011131828b1020848/sphinx/themes/basic/layout.html#L135-L137

docs/changelog.rst

@@ -5,11 +5,17 @@ Changelog
 master
 ======
 
+Other Changes
+-------------
+
+* The ``canonical_url`` option was deprecated in favor of Sphinx's ``html_baseurl``.
+
 New Features
 ------------
 
 * New theme option to enable anonymous ip addresses when using Google Analytics (#889)
 
+
 v0.5.0
 ======
 

docs/configuring.rst

@@ -13,7 +13,6 @@ For example:
 .. code:: python
 
     html_theme_options = {
-        'canonical_url': '',
         'analytics_id': 'UA-XXXXXXX-1',  #  Provided by Google in your dashboard
         'analytics_anonymize_ip': False,
         'logo_only': False,
@@ -119,6 +118,12 @@ Miscellaneous options
     documentation is available through. The URL points to the root path of the
     documentation and requires a trailing slash.
 
+    .. deprecated:: 0.6.0
+
+       Use :confval:`sphinx:html_baseurl` instead.
+
+    .. _canonical URL: https://en.wikipedia.org/wiki/Canonical_link_element
+
 .. confval:: display_version
 
     :type: boolean
@@ -165,10 +170,7 @@ Miscellaneous options
     :default: ``#2980B9``
 
     Changes the background of the search area in the navigation bar. The value
-    can be anything valid in a CSS `background` property. 
-
-.. _canonical URL: https://en.wikipedia.org/wiki/Canonical_link_element
-
+    can be anything valid in a CSS `background` property.
 
 File-wide metadata
 ==================

sphinx_rtd_theme/__init__.py

@@ -6,29 +6,47 @@
 
 from os import path
 
-import sphinx
+from sphinx import version_info
+from sphinx.locale import _
+
+try:
+    # Avaliable from Sphinx 1.6
+    from sphinx.util.logging import getLogger
+except ImportError:
+    from logging import getLogger
 
 
 __version__ = '0.5.0'
 __version_full__ = __version__
 
+logger = getLogger(__name__)
+
 
 def get_html_theme_path():
     """Return list of HTML theme paths."""
     cur_dir = path.abspath(path.dirname(path.dirname(__file__)))
     return cur_dir
 
 
+def config_initiated(app, config):
+    theme_options = config.html_theme_options or {}
+    if theme_options.get('canonical_url'):
+        logger.warning(
+            _('The canonical_url option is deprecated, use the html_baseurl option from Sphinx instead.')
+        )
+
+
 # See http://www.sphinx-doc.org/en/stable/theming.html#distribute-your-theme-as-a-python-package
 def setup(app):
-    if sphinx.version_info >= (1, 6, 0):
+    if version_info >= (1, 6, 0):
         # Register the theme that can be referenced without adding a theme path
         app.add_html_theme('sphinx_rtd_theme', path.abspath(path.dirname(__file__)))
 
-    if sphinx.version_info >= (1, 8, 0):
+    if version_info >= (1, 8, 0):
         # Add Sphinx message catalog for newer versions of Sphinx
         # See http://www.sphinx-doc.org/en/master/extdev/appapi.html#sphinx.application.Sphinx.add_message_catalog
         rtd_locale_path = path.join(path.abspath(path.dirname(__file__)), 'locale')
         app.add_message_catalog('sphinx', rtd_locale_path)
+        app.connect('config-inited', config_initiated)
 
     return {'parallel_read_safe': True, 'parallel_write_safe': True}

sphinx_rtd_theme/layout.html

@@ -38,11 +38,17 @@
   {% if favicon %}
     <link rel="shortcut icon" href="{{ pathto('_static/' + favicon, 1) }}"/>
   {% endif %}
-  {# CANONICAL URL #}
-  {% if theme_canonical_url %}
+
+  {# CANONICAL URL (deprecated) #}
+  {% if theme_canonical_url and not pageurl %}
     <link rel="canonical" href="{{ theme_canonical_url }}{{ pagename }}.html"/>
   {% endif %}
 
+  {# CANONICAL URL #}
+  {%- if pageurl %}
+    <link rel="canonical" href="{{ pageurl|e }}" />
+  {%- endif %}
+
   {# JAVASCRIPTS #}
   {%- block scripts %}
   <!--[if lt IE 9]>