Merge branch '2.0'

25 files changed, 220 insertions, 41 deletions

diff --git a/CHANGES b/CHANGES
index 8fbca5bc9..59cb99f64 100644
--- a/CHANGES
+++ b/CHANGES
@@ -42,6 +42,36 @@ Incompatible changes
 Deprecated
 ----------
 
+* ``sphinx.io.FiletypeNotFoundError``
+* ``sphinx.io.get_filetype()``
+
+Features added
+--------------
+
+* #6910: inheritance_diagram: Make the background of diagrams transparent
+* #6446: duration: Add ``sphinx.ext.durations`` to inspect which documents slow
+  down the build
+
+Bugs fixed
+----------
+
+* #6925: html: Remove redundant type="text/javascript" from <script> elements
+
+Testing
+--------
+
+Release 2.3.1 (in development)
+==============================
+
+Dependencies
+------------
+
+Incompatible changes
+--------------------
+
+Deprecated
+----------
+
 Features added
 --------------
 
diff --git a/doc/_themes/sphinx13/layout.html b/doc/_themes/sphinx13/layout.html
index df0b82bb8..8d1b04a14 100644
--- a/doc/_themes/sphinx13/layout.html
+++ b/doc/_themes/sphinx13/layout.html
@@ -30,7 +30,7 @@
       .related { display: none; }
       {% endif %}
     </style>
-    <script type="text/javascript">
+    <script>
       // intelligent scrolling of the sidebar content
       $(window).scroll(function() {
         var sb = $('.sphinxsidebarwrapper');
diff --git a/doc/extdev/deprecated.rst b/doc/extdev/deprecated.rst
index 482cb50bb..9fdaa2f96 100644
--- a/doc/extdev/deprecated.rst
+++ b/doc/extdev/deprecated.rst
@@ -26,6 +26,16 @@ The following is a list of deprecated interfaces.
      - (will be) Removed
      - Alternatives
 
+   * - ``sphinx.io.FiletypeNotFoundError``
+     - 2.4
+     - 4.0
+     - ``sphinx.errors.FiletypeNotFoundError``
+
+   * - ``sphinx.io.get_filetype()``
+     - 2.4
+     - 4.0
+     - ``sphinx.util.get_filetype()``
+
    * - ``sphinx.builders.gettext.POHEADER``
      - 2.3
      - 4.0
diff --git a/doc/faq.rst b/doc/faq.rst
index ba16ceb9a..28d14d79e 100644
--- a/doc/faq.rst
+++ b/doc/faq.rst
@@ -89,7 +89,7 @@ Google Analytics
 
       {%- block extrahead %}
       {{ super() }}
-      <script type="text/javascript">
+      <script>
         var _gaq = _gaq || [];
         _gaq.push(['_setAccount', 'XXX account number XXX']);
         _gaq.push(['_trackPageview']);
@@ -101,7 +101,7 @@ Google Analytics
       <div class="footer">This page uses <a href="https://analytics.google.com/">
       Google Analytics</a> to collect statistics. You can disable it by blocking
       the JavaScript coming from www.google-analytics.com.
-      <script type="text/javascript">
+      <script>
         (function() {
           var ga = document.createElement('script');
           ga.src = ('https:' == document.location.protocol ?
@@ -132,7 +132,6 @@ Google Search
                (function() {
                   var cx = '......';
                   var gcse = document.createElement('script');
-                  gcse.type = 'text/javascript';
                   gcse.async = true;
                   gcse.src = 'https://cse.google.com/cse.js?cx=' + cx;
                   var s = document.getElementsByTagName('script')[0];
diff --git a/doc/usage/extensions/duration.rst b/doc/usage/extensions/duration.rst
new file mode 100644
index 000000000..c57549984
--- /dev/null
+++ b/doc/usage/extensions/duration.rst
@@ -0,0 +1,11 @@
+:mod:`sphinx.ext.duration` -- Measure durations of Sphinx processing
+====================================================================
+
+.. module:: sphinx.ext.duration
+   :synopsis: Measure durations of Sphinx processing
+
+.. versionadded:: 2.3
+
+This extension measures durations of Sphinx processing and show its
+result at end of the build.  It is useful for inspecting what document
+is slowly built.
diff --git a/doc/usage/extensions/index.rst b/doc/usage/extensions/index.rst
index ae9639ee8..6aab8adb2 100644
--- a/doc/usage/extensions/index.rst
+++ b/doc/usage/extensions/index.rst
@@ -23,6 +23,7 @@ These extensions are built in and can be activated by respective entries in the
    autosummary
    coverage
    doctest
+   duration
    extlinks
    githubpages
    graphviz
diff --git a/setup.py b/setup.py
index df34d4fa8..a5dd04b0a 100644
--- a/setup.py
+++ b/setup.py
@@ -47,7 +47,7 @@ extras_require = {
         'html5lib',
         'flake8>=3.5.0',
         'flake8-import-order',
-        'mypy>=0.750',
+        'mypy>=0.761',
         'docutils-stubs',
     ],
 }
diff --git a/sphinx/builders/html.py b/sphinx/builders/html.py
index 50c38cdb2..48b21fa4e 100644
--- a/sphinx/builders/html.py
+++ b/sphinx/builders/html.py
@@ -117,7 +117,6 @@ class JavaScript(str):
         self = str.__new__(cls, filename)  # type: ignore
         self.filename = filename
         self.attributes = attributes
-        self.attributes.setdefault('type', 'text/javascript')
 
         return self
 
@@ -1098,7 +1097,6 @@ def setup_js_tag_helper(app: Sphinx, pagename: str, templatexname: str,
                 attrs.append('src="%s"' % pathto(js.filename, resource=True))
         else:
             # str value (old styled)
-            attrs.append('type="text/javascript"')
             attrs.append('src="%s"' % pathto(js, resource=True))
         return '<script %s>%s</script>' % (' '.join(attrs), body)
 
diff --git a/sphinx/errors.py b/sphinx/errors.py
index 7f8b1fbd5..64036721f 100644
--- a/sphinx/errors.py
+++ b/sphinx/errors.py
@@ -126,3 +126,8 @@ class PycodeError(Exception):
 class NoUri(Exception):
     """Raised by builder.get_relative_uri() if there is no URI available."""
     pass
+
+
+class FiletypeNotFoundError(Exception):
+    "Raised by get_filetype() if a filename matches no source suffix."
+    pass
diff --git a/sphinx/ext/duration.py b/sphinx/ext/duration.py
new file mode 100644
index 000000000..1286e49ec
--- /dev/null
+++ b/sphinx/ext/duration.py
@@ -0,0 +1,96 @@
+"""
+    sphinx.ext.duration
+    ~~~~~~~~~~~~~~~~~~~
+
+    Measure durations of Sphinx processing.
+
+    :copyright: Copyright 2007-2019 by the Sphinx team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+from datetime import datetime, timedelta
+from itertools import islice
+from operator import itemgetter
+from typing import cast
+from typing import Dict, List
+
+from docutils import nodes
+
+from sphinx.application import Sphinx
+from sphinx.domains import Domain
+from sphinx.locale import __
+from sphinx.util import logging
+
+logger = logging.getLogger(__name__)
+
+
+class DurationDomain(Domain):
+    """A domain for durations of Sphinx processing."""
+    name = 'duration'
+
+    @property
+    def reading_durations(self) -> Dict[str, timedelta]:
+        return self.data.setdefault('reading_durations', {})
+
+    def note_reading_duration(self, duration: timedelta):
+        self.reading_durations[self.env.docname] = duration
+
+    def clear(self) -> None:
+        self.reading_durations.clear()
+
+    def clear_doc(self, docname: str) -> None:
+        self.reading_durations.pop(docname, None)
+
+    def merge_domaindata(self, docnames: List[str], otherdata: Dict[str, timedelta]) -> None:
+        for docname, duration in otherdata.items():
+            if docname in docnames:
+                self.reading_durations[docname] = duration
+
+
+def on_builder_inited(app: Sphinx) -> None:
+    """Initialize DurationDomain on bootstrap.
+
+    This clears results of last build.
+    """
+    domain = cast(DurationDomain, app.env.get_domain('duration'))
+    domain.clear()
+
+
+def on_source_read(app: Sphinx, docname: str, content: List[str]) -> None:
+    """Start to measure reading duration."""
+    app.env.temp_data['started_at'] = datetime.now()
+
+
+def on_doctree_read(app: Sphinx, doctree: nodes.document) -> None:
+    """Record a reading duration."""
+    started_at = app.env.temp_data.get('started_at')
+    duration = datetime.now() - started_at
+    domain = cast(DurationDomain, app.env.get_domain('duration'))
+    domain.note_reading_duration(duration)
+
+
+def on_build_finished(app: Sphinx, error):
+    """Display duration ranking on current build."""
+    domain = cast(DurationDomain, app.env.get_domain('duration'))
+    durations = sorted(domain.reading_durations.items(), key=itemgetter(1), reverse=True)
+    if not durations:
+        return
+
+    logger.info('')
+    logger.info(__('====================== slowest reading durations ======================='))
+    for docname, d in islice(durations, 5):
+        logger.info('%d.%03d %s', d.seconds, d.microseconds / 1000, docname)
+
+
+def setup(app):
+    app.add_domain(DurationDomain)
+    app.connect('builder-inited', on_builder_inited)
+    app.connect('source-read', on_source_read)
+    app.connect('doctree-read', on_doctree_read)
+    app.connect('build-finished', on_build_finished)
+
+    return {
+        'version': 'builtin',
+        'parallel_read_safe': True,
+        'parallel_write_safe': True,
+    }
diff --git a/sphinx/io.py b/sphinx/io.py
index f3e72733e..624a04246 100644
--- a/sphinx/io.py
+++ b/sphinx/io.py
@@ -18,7 +18,8 @@ from docutils.readers import standalone
 from docutils.transforms.references import DanglingReferences
 from docutils.writers import UnfilteredWriter
 
-from sphinx.deprecation import RemovedInSphinx40Warning
+from sphinx.errors import FiletypeNotFoundError
+from sphinx.deprecation import RemovedInSphinx40Warning, deprecated_alias
 from sphinx.transforms import (
     AutoIndexUpgrader, DoctreeReadEvent, FigureAligner, SphinxTransformer
 )
@@ -26,7 +27,7 @@ from sphinx.transforms.i18n import (
     PreserveTranslatableMessages, Locale, RemoveTranslatableInline,
 )
 from sphinx.transforms.references import SphinxDomains
-from sphinx.util import logging
+from sphinx.util import logging, get_filetype
 from sphinx.util import UnicodeDecodeErrorHandler
 from sphinx.util.docutils import LoggingReporter
 from sphinx.versioning import UIDTransform
@@ -192,20 +193,6 @@ class SphinxFileInput(FileInput):
         super().__init__(*args, **kwargs)
 
 
-class FiletypeNotFoundError(Exception):
-    pass
-
-
-def get_filetype(source_suffix, filename):
-    # type: (Dict[str, str], str) -> str
-    for suffix, filetype in source_suffix.items():
-        if filename.endswith(suffix):
-            # If default filetype (None), considered as restructuredtext.
-            return filetype or 'restructuredtext'
-    else:
-        raise FiletypeNotFoundError
-
-
 def read_doc(app, env, filename):
     # type: (Sphinx, BuildEnvironment, str) -> nodes.document
     """Parse a document and convert to doctree."""
@@ -249,3 +236,11 @@ def read_doc(app, env, filename):
 
     pub.publish()
     return pub.document
+
+
+deprecated_alias('sphinx.io',
+                 {
+                     'FiletypeNotFoundError': FiletypeNotFoundError,
+                     'get_filetype': get_filetype,
+                 },
+                 RemovedInSphinx40Warning)
diff --git a/sphinx/pycode/parser.py b/sphinx/pycode/parser.py
index 4233089ff..cbae86c9e 100644
--- a/sphinx/pycode/parser.py
+++ b/sphinx/pycode/parser.py
@@ -129,7 +129,7 @@ class TokenProcessor:
     def __init__(self, buffers: List[str]) -> None:
         lines = iter(buffers)
         self.buffers = buffers
-        self.tokens = tokenize.generate_tokens(lambda: next(lines))  # type: ignore
+        self.tokens = tokenize.generate_tokens(lambda: next(lines))
         self.current = None     # type: Token
         self.previous = None    # type: Token
 
diff --git a/sphinx/themes/basic/domainindex.html b/sphinx/themes/basic/domainindex.html
index 35c64ccb5..3cf1bc4e8 100644
--- a/sphinx/themes/basic/domainindex.html
+++ b/sphinx/themes/basic/domainindex.html
@@ -12,7 +12,7 @@
 {% block extrahead %}
 {{ super() }}
 {% if not embedded and collapse_index %}
-    <script type="text/javascript">
+    <script>
       DOCUMENTATION_OPTIONS.COLLAPSE_INDEX = true;
     </script>
 {% endif %}
diff --git a/sphinx/themes/basic/layout.html b/sphinx/themes/basic/layout.html
index 987aeeb6e..2c9e24930 100644
--- a/sphinx/themes/basic/layout.html
+++ b/sphinx/themes/basic/layout.html
@@ -87,7 +87,7 @@
 {%- endmacro %}
 
 {%- macro script() %}
-    <script type="text/javascript" id="documentation_options" data-url_root="{{ pathto('', 1) }}" src="{{ pathto('_static/documentation_options.js', 1) }}"></script>
+    <script id="documentation_options" data-url_root="{{ pathto('', 1) }}" src="{{ pathto('_static/documentation_options.js', 1) }}"></script>
     {%- for js in script_files %}
     {{ js_tag(js) }}
     {%- endfor %}
diff --git a/sphinx/themes/basic/search.html b/sphinx/themes/basic/search.html
index a9b9960d2..3cda0feaa 100644
--- a/sphinx/themes/basic/search.html
+++ b/sphinx/themes/basic/search.html
@@ -11,16 +11,16 @@
 {% set title = _('Search') %}
 {%- block scripts %}
     {{ super() }}
-    <script type="text/javascript" src="{{ pathto('_static/searchtools.js', 1) }}"></script>
+    <script src="{{ pathto('_static/searchtools.js', 1) }}"></script>
 {%- endblock %}
 {% block extrahead %}
-  <script type="text/javascript" src="{{ pathto('searchindex.js', 1) }}" defer></script>
+  <script src="{{ pathto('searchindex.js', 1) }}" defer></script>
   {{ super() }}
 {% endblock %}
 {% block body %}
   <h1 id="search-documentation">{{ _('Search') }}</h1>
   <div id="fallback" class="admonition warning">
-  <script type="text/javascript">$('#fallback').hide();</script>
+  <script>$('#fallback').hide();</script>
   <p>
     {% trans %}Please activate JavaScript to enable the search
     functionality.{% endtrans %}
diff --git a/sphinx/themes/basic/searchbox.html b/sphinx/themes/basic/searchbox.html
index 6679ca6b5..8658f9759 100644
--- a/sphinx/themes/basic/searchbox.html
+++ b/sphinx/themes/basic/searchbox.html
@@ -17,5 +17,5 @@
     </form>
     </div>
 </div>
-<script type="text/javascript">$('#searchbox').show(0);</script>
+<script>$('#searchbox').show(0);</script>
 {%- endif %}
diff --git a/sphinx/themes/bizstyle/layout.html b/sphinx/themes/bizstyle/layout.html
index d1deafde4..126bb59e9 100644
--- a/sphinx/themes/bizstyle/layout.html
+++ b/sphinx/themes/bizstyle/layout.html
@@ -11,7 +11,7 @@
 
 {%- block scripts %}
     {{ super() }}
-    <script type="text/javascript" src="{{ pathto('_static/bizstyle.js', 1) }}"></script>
+    <script src="{{ pathto('_static/bizstyle.js', 1) }}"></script>
 {%- endblock %}
 
 {# put the sidebar before the body #}
@@ -26,6 +26,6 @@
 {%- block extrahead %}
     <meta name="viewport" content="width=device-width,initial-scale=1.0">
     <!--[if lt IE 9]>
-    <script type="text/javascript" src="_static/css3-mediaqueries.js"></script>
+    <script src="_static/css3-mediaqueries.js"></script>
     <![endif]-->
 {%- endblock %}
diff --git a/sphinx/themes/classic/layout.html b/sphinx/themes/classic/layout.html
index a67a931c8..9f22787c5 100644
--- a/sphinx/themes/classic/layout.html
+++ b/sphinx/themes/classic/layout.html
@@ -12,6 +12,6 @@
 {%- block scripts %}
     {{ super() }}
     {% if theme_collapsiblesidebar|tobool %}
-    <script type="text/javascript" src="{{ pathto('_static/sidebar.js', 1) }}"></script>
+    <script src="{{ pathto('_static/sidebar.js', 1) }}"></script>
     {% endif %}
 {%- endblock %}
diff --git a/sphinx/themes/scrolls/layout.html b/sphinx/themes/scrolls/layout.html
index 08f8970fc..11c571749 100644
--- a/sphinx/themes/scrolls/layout.html
+++ b/sphinx/themes/scrolls/layout.html
@@ -15,7 +15,7 @@
 {%- endblock %}
 {%- block scripts %}
     {{ super() }}
-    <script type="text/javascript" src="{{ pathto('_static/theme_extras.js', 1) }}"></script>
+    <script src="{{ pathto('_static/theme_extras.js', 1) }}"></script>
 {%- endblock %}
 {# do not display relbars #}
 {% block relbar1 %}{% endblock %}
diff --git a/sphinx/transforms/i18n.py b/sphinx/transforms/i18n.py
index 6512fd43d..d1c125a7e 100644
--- a/sphinx/transforms/i18n.py
+++ b/sphinx/transforms/i18n.py
@@ -22,7 +22,7 @@ from sphinx.config import Config
 from sphinx.domains.std import make_glossary_term, split_term_classifiers
 from sphinx.locale import __, init as init_locale
 from sphinx.transforms import SphinxTransform
-from sphinx.util import split_index_msg, logging
+from sphinx.util import split_index_msg, logging, get_filetype
 from sphinx.util.i18n import docname_to_domain
 from sphinx.util.nodes import (
     LITERAL_TYPE_NODES, IMAGE_TYPE_NODES, NodeMatcher,
@@ -61,7 +61,8 @@ def publish_msgstr(app: "Sphinx", source: str, source_path: str, source_line: in
         from sphinx.io import SphinxI18nReader
         reader = SphinxI18nReader()
         reader.setup(app)
-        parser = app.registry.create_source_parser(app, 'restructuredtext')
+        filetype = get_filetype(config.source_suffix, source_path)
+        parser = app.registry.create_source_parser(app, filetype)
         doc = reader.read(
             source=StringInput(source=source,
                                source_path="%s:%s:<translated>" % (source_path, source_line)),
diff --git a/sphinx/util/__init__.py b/sphinx/util/__init__.py
index d44290b7b..2032b94ac 100644
--- a/sphinx/util/__init__.py
+++ b/sphinx/util/__init__.py
@@ -29,7 +29,9 @@ from typing import Any, Callable, Dict, IO, Iterable, Iterator, List, Pattern, S
 from urllib.parse import urlsplit, urlunsplit, quote_plus, parse_qsl, urlencode
 
 from sphinx.deprecation import RemovedInSphinx40Warning
-from sphinx.errors import PycodeError, SphinxParallelError, ExtensionError
+from sphinx.errors import (
+    PycodeError, SphinxParallelError, ExtensionError, FiletypeNotFoundError
+)
 from sphinx.locale import __
 from sphinx.util import logging
 from sphinx.util.console import strip_colors, colorize, bold, term_width_line  # type: ignore
@@ -117,6 +119,16 @@ def get_matching_docs(dirname: str, suffixes: List[str],
                 break
 
 
+def get_filetype(source_suffix, filename):
+    # type: (Dict[str, str], str) -> str
+    for suffix, filetype in source_suffix.items():
+        if filename.endswith(suffix):
+            # If default filetype (None), considered as restructuredtext.
+            return filetype or 'restructuredtext'
+    else:
+        raise FiletypeNotFoundError
+
+
 class FilenameUniqDict(dict):
     """
     A dictionary that automatically generates unique names for its keys,
diff --git a/tests/test_build_html.py b/tests/test_build_html.py
index 66164dd1c..b83bd5637 100644
--- a/tests/test_build_html.py
+++ b/tests/test_build_html.py
@@ -1216,8 +1216,8 @@ def test_html_assets(app):
             'href="https://example.com/custom.css" />' in content)
 
     # html_js_files
-    assert '<script type="text/javascript" src="_static/js/custom.js"></script>' in content
-    assert ('<script async="async" type="text/javascript" src="https://example.com/script.js">'
+    assert '<script src="_static/js/custom.js"></script>' in content
+    assert ('<script async="async" src="https://example.com/script.js">'
             '</script>' in content)
 
 
diff --git a/tests/test_ext_duration.py b/tests/test_ext_duration.py
new file mode 100644
index 000000000..65ea1eef7
--- /dev/null
+++ b/tests/test_ext_duration.py
@@ -0,0 +1,21 @@
+"""
+    test_ext_duration
+    ~~~~~~~~~~~~~~~~~
+
+    Test sphinx.ext.duration extension.
+
+    :copyright: Copyright 2007-2019 by the Sphinx team, see AUTHORS.
+    :license: BSD, see LICENSE for details.
+"""
+
+import re
+import pytest
+
+
+@pytest.mark.sphinx('dummy', testroot='basic',
+                    confoverrides={'extensions': ['sphinx.ext.duration']})
+def test_githubpages(app, status, warning):
+    app.build()
+
+    assert 'slowest reading durations' in status.getvalue()
+    assert re.search('\\d+\\.\\d{3} index\n', status.getvalue())
diff --git a/tests/test_ext_math.py b/tests/test_ext_math.py
index 7fbfd1477..32a50512a 100644
--- a/tests/test_ext_math.py
+++ b/tests/test_ext_math.py
@@ -70,7 +70,7 @@ def test_mathjax_options(app, status, warning):
     app.builder.build_all()
 
     content = (app.outdir / 'index.html').text()
-    assert ('<script async="async" integrity="sha384-0123456789" type="text/javascript" '
+    assert ('<script async="async" integrity="sha384-0123456789" '
             'src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/latest.js?'
             'config=TeX-AMS-MML_HTMLorMML"></script>' in content)
 
diff --git a/tox.ini b/tox.ini
index 922432d67..8dd113602 100644
--- a/tox.ini
+++ b/tox.ini
@@ -15,7 +15,7 @@ deps =
     du13: docutils==0.13.1
     du14: docutils==0.14
     du15: docutils==0.15
-    du16: docutils==0.16b0.dev0
+    du16: docutils==0.16rc1
 extras =
     test
 setenv =