fix: deprecation of Theme._vars by using config attributes

mkdocs_rss_plugin/util.py

@@ -612,16 +612,48 @@ def guess_locale(mkdocs_config: Config) -> str or None:
         # MkDocs locale settings - might be added in future mkdocs versions
         # see: https://github.com/timvink/mkdocs-git-revision-date-localized-plugin/issues/24
         if mkdocs_config.get("locale"):
+            logger.warning(
+                DeprecationWarning(
+                    "[rss-plugin] Mkdocs does not support locale option at the "
+                    "configuration root but under theme sub-configuration. It won't be "
+                    "supported anymore by the plugin in the next version."
+                )
+            )
             return mkdocs_config.get("locale")
 
-        # Some themes implement a locale or a language setting
-        if "theme" in mkdocs_config and "locale" in mkdocs_config.get("theme"):
-            locale = mkdocs_config.get("theme")._vars.get("locale")
-            return f"{locale.language}-{locale.territory}"
-        elif "theme" in mkdocs_config and "language" in mkdocs_config.get("theme"):
-            return mkdocs_config.get("theme")._vars.get("language")
-        else:
-            return None
+        # Some themes implement a locale or a language settings
+        if "theme" in mkdocs_config:
+            if (
+                mkdocs_config.theme.name == "material"
+                and "language" in mkdocs_config.theme
+            ):
+                # TODO: remove custom behavior when Material theme switches to locale
+                # see: https://github.com/squidfunk/mkdocs-material/discussions/6453
+                logger.debug(
+                    "[rss plugin] Language detected in Material theme "
+                    f"('{mkdocs_config.theme.name}') settings: "
+                    f"{mkdocs_config.theme.get('language')}"
+                )
+                return mkdocs_config.theme.get("language")
+
+            elif "locale" in mkdocs_config.theme:
+                locale = mkdocs_config.theme.locale
+                logger.debug(
+                    "[rss plugin] Locale detected in theme "
+                    f"('{mkdocs_config.theme.name}') settings: {locale=}"
+                )
+                return (
+                    f"{locale.language}-{locale.territory}"
+                    if locale.territory
+                    else f"{locale.language}"
+                )
+            else:
+                logger.debug(
+                    "[rss plugin] Nor locale or language detected in theme settings "
+                    f"('{mkdocs_config.theme.name}')."
+                )
+
+        return None
 
     @staticmethod
     def filter_pages(pages: list, attribute: str, length: int) -> list:

tests/fixtures/mkdocs_language_specific_material.yml

@@ -0,0 +1,11 @@
+site_name: Test RSS Plugin
+site_description: Test a language code set in with territory
+site_url: https://guts.github.io/mkdocs-rss-plugin
+
+plugins:
+    - rss
+
+theme:
+    name: material
+    locale: en_US
+    language: fr  # custom setting for historical reason - see: https://github.com/squidfunk/mkdocs-material/discussions/6453

tests/fixtures/mkdocs_locale_without_territory.yml

@@ -0,0 +1,12 @@
+site_name: Test RSS Plugin
+site_description: Test a language code with territory
+site_url: https://guts.github.io/mkdocs-rss-plugin
+
+use_directory_urls: true
+
+plugins:
+    - rss
+
+theme:
+    name: mkdocs
+    locale: fr

tests/test_build.py

@@ -330,12 +330,12 @@ def test_simple_build_item_length_unlimited(self):
                         len(feed_item.description), 150, feed_item.title
                     )
 
-    def test_simple_build_lang_with_territory(self):
+    def test_simple_build_locale_with_territory(self):
         with tempfile.TemporaryDirectory() as tmpdirname:
             cli_result = self.build_docs_setup(
                 testproject_path="docs",
                 mkdocs_yml_filepath=Path(
-                    "tests/fixtures/mkdocs_lang_with_territory.yml"
+                    "tests/fixtures/mkdocs_locale_with_territory.yml"
                 ),
                 output_path=tmpdirname,
                 strict=True,
@@ -356,6 +356,58 @@ def test_simple_build_lang_with_territory(self):
             feed_parsed = feedparser.parse(Path(tmpdirname) / "feed_rss_updated.xml")
             self.assertEqual(feed_parsed.feed.get("language"), "en-US")
 
+    def test_simple_build_locale_without_territory(self):
+        with tempfile.TemporaryDirectory() as tmpdirname:
+            cli_result = self.build_docs_setup(
+                testproject_path="docs",
+                mkdocs_yml_filepath=Path(
+                    "tests/fixtures/mkdocs_locale_without_territory.yml"
+                ),
+                output_path=tmpdirname,
+                strict=True,
+            )
+
+            if cli_result.exception is not None:
+                e = cli_result.exception
+                logger.debug(format_exception(type(e), e, e.__traceback__))
+
+            self.assertEqual(cli_result.exit_code, 0)
+            self.assertIsNone(cli_result.exception)
+
+            # created items
+            feed_parsed = feedparser.parse(Path(tmpdirname) / "feed_rss_created.xml")
+            self.assertEqual(feed_parsed.feed.get("language"), "fr")
+
+            # updated items
+            feed_parsed = feedparser.parse(Path(tmpdirname) / "feed_rss_updated.xml")
+            self.assertEqual(feed_parsed.feed.get("language"), "fr")
+
+    def test_simple_build_language_specific_material(self):
+        with tempfile.TemporaryDirectory() as tmpdirname:
+            cli_result = self.build_docs_setup(
+                testproject_path="docs",
+                mkdocs_yml_filepath=Path(
+                    "tests/fixtures/mkdocs_language_specific_material.yml"
+                ),
+                output_path=tmpdirname,
+                strict=True,
+            )
+
+            if cli_result.exception is not None:
+                e = cli_result.exception
+                logger.debug(format_exception(type(e), e, e.__traceback__))
+
+            self.assertEqual(cli_result.exit_code, 0)
+            self.assertIsNone(cli_result.exception)
+
+            # created items
+            feed_parsed = feedparser.parse(Path(tmpdirname) / "feed_rss_created.xml")
+            self.assertEqual(feed_parsed.feed.get("language"), "fr")
+
+            # updated items
+            feed_parsed = feedparser.parse(Path(tmpdirname) / "feed_rss_updated.xml")
+            self.assertEqual(feed_parsed.feed.get("language"), "fr")
+
     def test_simple_build_pretty_print_enabled(self):
         with tempfile.TemporaryDirectory() as tmpdirname:
             cli_result = self.build_docs_setup(