From b9469b9013eca8ba4df2df527a9a9fdf3666c458 Mon Sep 17 00:00:00 2001
From: Georg Brandl <georg@python.org>
Date: Fri, 19 Sep 2014 12:21:38 +0200
Subject: [PATCH] Changing the default role document-locally with the docutils
 ".. default-role::" directive is now supported.

---
 CHANGES                       |  2 ++
 sphinx/directives/__init__.py | 32 +++++++++++++++++++++++++++++++-
 sphinx/environment.py         |  1 +
 sphinx/roles.py               |  7 ++++++-
 4 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/CHANGES b/CHANGES
index 6279c4467..114e27706 100644
--- a/CHANGES
+++ b/CHANGES
@@ -31,6 +31,8 @@ Features added
   can be shown in the traceback log files).  Version requirements for extensions
   can be specified in projects using the new :confval:`needs_extensions` config
   value.
+* Changing the default role within a document with the :rst:dir:`default-role`
+  directive is now supported.
 * PR#214: Added stemming support for 14 languages, so that the built-in document
   search can now handle these.  Thanks to Shibukawa Yoshiki.
 * PR#202: Allow "." and "~" prefixed references in ``:param:`` doc fields
diff --git a/sphinx/directives/__init__.py b/sphinx/directives/__init__.py
index 52b638fe0..969426bc1 100644
--- a/sphinx/directives/__init__.py
+++ b/sphinx/directives/__init__.py
@@ -11,7 +11,8 @@
 
 import re
 
-from docutils.parsers.rst import Directive, directives
+from docutils import nodes
+from docutils.parsers.rst import Directive, directives, roles
 
 from sphinx import addnodes
 from sphinx.util.docfields import DocFieldTransformer
@@ -162,6 +163,34 @@ class ObjectDescription(Directive):
 DescDirective = ObjectDescription
 
 
+class DefaultRole(Directive):
+    """
+    Set the default interpreted text role.  Overridden from docutils.
+    """
+
+    optional_arguments = 1
+    final_argument_whitespace = False
+
+    def run(self):
+        if not self.arguments:
+            if '' in roles._roles:
+                # restore the "default" default role
+                del roles._roles['']
+            return []
+        role_name = self.arguments[0]
+        role, messages = roles.role(role_name, self.state_machine.language,
+                                    self.lineno, self.state.reporter)
+        if role is None:
+            error = self.state.reporter.error(
+                'Unknown interpreted text role "%s".' % role_name,
+                nodes.literal_block(self.block_text, self.block_text),
+                line=self.lineno)
+            return messages + [error]
+        roles._roles[''] = role
+        self.state.document.settings.env.temp_data['default_role'] = role_name
+        return messages
+
+
 class DefaultDomain(Directive):
     """
     Directive to (re-)set the default domain for this source file.
@@ -186,6 +215,7 @@ class DefaultDomain(Directive):
         return []
 
 
+directives.register_directive('default-role', DefaultRole)
 directives.register_directive('default-domain', DefaultDomain)
 directives.register_directive('describe', ObjectDescription)
 # new, more consistent, name
diff --git a/sphinx/environment.py b/sphinx/environment.py
index 42f4da0ef..7838a5d1c 100644
--- a/sphinx/environment.py
+++ b/sphinx/environment.py
@@ -681,6 +681,7 @@ class BuildEnvironment:
 
         # cleanup
         self.temp_data.clear()
+        roles._roles.pop('', None)  # if a document has set a local default role
 
         if save_parsed:
             # save the parsed doctree
diff --git a/sphinx/roles.py b/sphinx/roles.py
index aaf6272bd..b99b22795 100644
--- a/sphinx/roles.py
+++ b/sphinx/roles.py
@@ -17,6 +17,7 @@ from docutils.parsers.rst import roles
 
 from sphinx import addnodes
 from sphinx.locale import _
+from sphinx.errors import SphinxError
 from sphinx.util import ws_re
 from sphinx.util.nodes import split_explicit_title, process_index_entry, \
      set_role_source_info
@@ -96,7 +97,11 @@ class XRefRole(object):
                  options={}, content=[]):
         env = inliner.document.settings.env
         if not typ:
-            typ = env.config.default_role
+            typ = env.temp_data.get('default_role')
+            if not typ:
+                typ = env.config.default_role
+            if not typ:
+                raise SphinxError('cannot determine default role!')
         else:
             typ = typ.lower()
         if ':' not in typ: