Merge branch 'stable'

CHANGES

@@ -89,6 +89,7 @@ Bugs fixed
 * #3796: env.resolve_references() crashes when non-document node given
 * #3803: Sphinx crashes with invalid PO files
 * #3791: PDF "continued on next page" for long tables isn't internationalized
+* #3788: smartquotes emits warnings for unsupported languages
 
 Testing
 --------

sphinx/cmdline.py

@@ -24,7 +24,7 @@ from sphinx.errors import SphinxError
 from sphinx.application import Sphinx
 from sphinx.util import Tee, format_exception_cut_frames, save_traceback
 from sphinx.util.console import red, nocolor, color_terminal  # type: ignore
-from sphinx.util.docutils import docutils_namespace
+from sphinx.util.docutils import docutils_namespace, patch_docutils
 from sphinx.util.osutil import abspath, fs_encoding
 from sphinx.util.pycompat import terminal_safe
 
@@ -299,7 +299,7 @@ def main(argv=sys.argv[1:]):  # type: ignore
 
     app = None
     try:
-        with docutils_namespace():
+        with patch_docutils(), docutils_namespace():
             app = Sphinx(srcdir, confdir, outdir, doctreedir, opts.builder,
                          confoverrides, status, warning, opts.freshenv,
                          opts.warningiserror, opts.tags, opts.verbosity, opts.jobs)

sphinx/environment/__init__.py

@@ -25,7 +25,7 @@ from six.moves import cPickle as pickle
 
 from docutils.io import NullOutput
 from docutils.core import Publisher
-from docutils.utils import Reporter, get_source_line
+from docutils.utils import Reporter, get_source_line, normalize_language_tag
 from docutils.utils.smartquotes import smartchars
 from docutils.parsers.rst import roles
 from docutils.parsers.rst.languages import en as english
@@ -672,10 +672,15 @@ class BuildEnvironment(object):
         self.settings['trim_footnote_reference_space'] = \
             self.config.trim_footnote_reference_space
         self.settings['gettext_compact'] = self.config.gettext_compact
-        language = (self.config.language or 'en').replace('_', '-')
+
+        language = self.config.language or 'en'
         self.settings['language_code'] = language
-        if language in smartchars.quotes:  # We enable smartypants by default
-            self.settings['smart_quotes'] = True
+        self.settings['smart_quotes'] = True
+        for tag in normalize_language_tag(language):
+            if tag in smartchars.quotes:
+                    break
+        else:
+            self.settings['smart_quotes'] = False
 
         docutilsconf = path.join(self.srcdir, 'docutils.conf')
         # read docutils.conf from source dir, not from current dir

sphinx/setup_command.py

@@ -23,7 +23,7 @@ from distutils.errors import DistutilsOptionError, DistutilsExecError  # type: i
 from sphinx.application import Sphinx
 from sphinx.cmdline import handle_exception
 from sphinx.util.console import nocolor, color_terminal
-from sphinx.util.docutils import docutils_namespace
+from sphinx.util.docutils import docutils_namespace, patch_docutils
 from sphinx.util.osutil import abspath
 
 if False:
@@ -183,7 +183,7 @@ class BuildDoc(Command):
             app = None
 
             try:
-                with docutils_namespace():
+                with patch_docutils(), docutils_namespace():
                     app = Sphinx(self.source_dir, self.config_dir,
                                  builder_target_dir, self.doctree_dir,
                                  builder, confoverrides, status_stream,

sphinx/util/docutils.py

@@ -13,9 +13,11 @@ from __future__ import absolute_import
 import re
 import types
 from copy import copy
+from distutils.version import LooseVersion
 from contextlib import contextmanager
 
 import docutils
+from docutils.languages import get_language
 from docutils.utils import Reporter
 from docutils.parsers.rst import directives, roles, convert_directive_function
 
@@ -34,7 +36,7 @@ if False:
     from sphinx.environment import BuildEnvironment  # NOQA
 
 
-__version_info__ = tuple(map(int, docutils.__version__.split('.')))
+__version_info__ = tuple(LooseVersion(docutils.__version__).version)
 
 
 @contextmanager
@@ -51,6 +53,29 @@ def docutils_namespace():
         roles._roles = _roles
 
 
+def patched_get_language(language_code, reporter=None):
+    # type: (unicode, Reporter) -> Any
+    """A wrapper for docutils.languages.get_language().
+
+    This ignores the second argument ``reporter`` to suppress warnings.
+    refs: https://github.com/sphinx-doc/sphinx/issues/3788
+    """
+    return get_language(language_code)
+
+
+@contextmanager
+def patch_docutils():
+    # type: () -> Iterator[None]
+    """Patch to docutils temporarily."""
+    try:
+        docutils.languages.get_language = patched_get_language
+
+        yield
+    finally:
+        # restore original implementations
+        docutils.languages.get_language = get_language
+
+
 class ElementLookupError(Exception):
     pass
 

tests/test_websupport.py

@@ -12,6 +12,7 @@
 from sphinx.websupport import WebSupport
 try:
     sqlalchemy_missing = False
+    import sqlalchemy  # NOQA
 except ImportError:
     sqlalchemy_missing = True