Works I think

.gitignore

@@ -1,3 +1,4 @@
 venv/
 testdata/
+__pycache__/
 

__main__.py

@@ -0,0 +1,37 @@
+import markdown
+import pathlib
+import os
+
+current_dir = pathlib.Path(__file__).parent
+
+with (current_dir / "base_feed.xml").open("r") as f:
+    base_feed = f.read()
+
+with (current_dir / "base_item.xml").open("r") as f:
+    base_item = f.read()
+
+def convert_case(string: str):
+    while string.find("_") != -1:
+        string = string.replace("_" + string[string.index("_") + 1], string[string.index("_") +1].upper())
+
+    return string
+
+def article_to_xml(article_path: pathlib.Path):
+    with (article_path / "article.md").open("r") as f:
+        markdown_data = f.read()
+
+    markdown_instance = markdown.Markdown(extensions=['meta', 'nl2br'])
+    html = markdown_instance.convert(markdown_data)
+    metadata = markdown_instance.Meta
+    tags = [f"<{convert_case(key)}>{metadata[key][0]}</{convert_case(key)}>" for key in metadata.keys()]
+    tags.append(f"<description>\n{html}\n</description>")
+    return base_item.format(tags="\n".join(tags))
+
+def make_rss_feed(path, channel_name, channel_link, description):
+    articles = "".join([article_to_xml(path) for path in (pathlib.Path.cwd() / path).glob("*")])
+    return base_feed \
+            .replace("{title}", channel_name)       \
+            .replace("{link}", channel_link)        \
+            .replace("{description}", description)  \
+            .replace("{items}", articles)
+

base_feed.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<rss version="2.0">
+
+<channel>
+<title>{title}</title>
+<link>{link}</link>
+<description>{description}</description>
+{items}
+</channel>
+
+</rss>

base_item.xml

@@ -0,0 +1,3 @@
+<item>
+{tags}
+</item>