fix(integrations): blog post detection was broken

Closes #404

Author: Guts

mkdocs_rss_plugin/integrations/theme_material_blog_plugin.py

@@ -11,18 +11,19 @@
 # 3rd party
 from mkdocs.config.defaults import MkDocsConfig
 from mkdocs.plugins import get_plugin_logger
-from mkdocs.structure.pages import Page
 
 # package
 from mkdocs_rss_plugin.constants import MKDOCS_LOGGER_NAME
 from mkdocs_rss_plugin.integrations.theme_material_base import (
     IntegrationMaterialThemeBase,
 )
+from mkdocs_rss_plugin.models import MkdocsPageSubset
 
 # conditional
 try:
     from material import __version__ as material_version
     from material.plugins.blog.plugin import BlogPlugin
+    from material.plugins.blog.structure import Post
 
 except ImportError:
     material_version = None
@@ -131,7 +132,7 @@ def author_name_from_id(self, author_id: str) -> str:
                 )
                 return author_id
 
-    def is_page_a_blog_post(self, mkdocs_page: Page) -> bool:
+    def is_page_a_blog_post(self, mkdocs_page: Post | MkdocsPageSubset) -> bool:
         """Identifies if the given page is part of Material Blog.
 
         Args:
@@ -140,6 +141,18 @@ def is_page_a_blog_post(self, mkdocs_page: Page) -> bool:
         Returns:
             bool: True if the given page is a Material Blog post.
         """
-        return Path(mkdocs_page.file.src_uri).is_relative_to(
-            self.blog_plugin_cfg.config.blog_dir
-        )
+        if self.IS_ENABLED and isinstance(mkdocs_page, Post):
+            logger.info(
+                f"page '{mkdocs_page.file.src_uri}' identified as Material Blog post."
+            )
+            return True
+        elif isinstance(mkdocs_page, MkdocsPageSubset) and Path(
+            mkdocs_page.src_uri
+        ).is_relative_to(self.blog_plugin_cfg.config.blog_dir):
+            logger.info(
+                f"page '{mkdocs_page.src_uri}' identified as Material Blog post "
+                f"by src_uri matching."
+            )
+            return True
+        else:
+            return False