Fix #6900: sphinx-build: -D option does not considers 0 and 1 as a boolean value

CHANGES

@@ -87,6 +87,8 @@ Bugs fixed
 * #6876: LaTeX: multi-line display of authors on title page has ragged edges
 * #6887: Sphinx crashes with docutils-0.16b0
 * #6920: sphinx-build: A console message is wrongly highlighted
+* #6900: sphinx-build: ``-D`` option does not considers ``0`` and ``1`` as a
+  boolean value
 
 Testing
 --------

sphinx/builders/latex/__init__.py

@@ -464,7 +464,7 @@ def setup(app: Sphinx) -> Dict[str, Any]:
     app.add_config_value('latex_logo', None, None, [str])
     app.add_config_value('latex_appendices', [], None)
     app.add_config_value('latex_use_latex_multicolumn', False, None)
-    app.add_config_value('latex_use_xindy', default_latex_use_xindy, None)
+    app.add_config_value('latex_use_xindy', default_latex_use_xindy, None, [bool])
     app.add_config_value('latex_toplevel_sectioning', None, None,
                          ENUM(None, 'part', 'chapter', 'section'))
     app.add_config_value('latex_domain_indices', True, None, [list])

sphinx/config.py

@@ -217,6 +217,12 @@ class Config:
             defvalue = self.values[name][0]
             if self.values[name][2] == Any:
                 return value
+            elif type(defvalue) is bool or self.values[name][2] == [bool]:
+                if value == '0':
+                    # given falsy string from command line option
+                    return False
+                else:
+                    return bool(value)
             elif isinstance(defvalue, dict):
                 raise ValueError(__('cannot override dictionary config setting %r, '
                                     'ignoring (use %r to set individual elements)') %

tests/test_config.py

@@ -119,6 +119,20 @@ def test_overrides():
     assert config.value8 == ['abc', 'def', 'ghi']
 
 
+def test_overrides_boolean():
+    config = Config({}, {'value1': '1',
+                         'value2': '0',
+                         'value3': '0'})
+    config.add('value1', None, 'env', [bool])
+    config.add('value2', None, 'env', [bool])
+    config.add('value3', True, 'env', ())
+    config.init_values()
+
+    assert config.value1 is True
+    assert config.value2 is False
+    assert config.value3 is False
+
+
 @mock.patch("sphinx.config.logger")
 def test_errors_warnings(logger, tempdir):
     # test the error for syntax errors in the config file