feat: add rss converter

src/markitdown/_markitdown.py

@@ -13,6 +13,7 @@ import sys
 import tempfile
 import traceback
 import zipfile
+from xml.dom import minidom
 from typing import Any, Dict, List, Optional, Union
 from urllib.parse import parse_qs, quote, unquote, urlparse, urlunparse
 from warnings import catch_warnings
@@ -219,6 +220,83 @@ class HtmlConverter(DocumentConverter):
             text_content=webpage_text,
         )
 
+class RSSConverter(DocumentConverter):
+    """Convert RSS type to markdown"""
+    
+    def convert(
+        self, local_path: str, **kwargs
+    ) -> Union[None, DocumentConverterResult]:
+        # Bail if not RSS type
+        extension = kwargs.get("file_extension", "")
+        if extension.lower() not in [".xml", ".rss"]:
+            return None
+        try:
+            doc = minidom.parse(local_path)
+        except BaseException as _:
+            return None
+        if not doc.getElementsByTagName("rss"):
+            # A RSS feed must have a root element of <rss>
+            return None
+        
+        try:
+            root = doc.getElementsByTagName("rss")[0]
+            channel = root.getElementsByTagName("channel")
+            if not channel:
+                return None
+            channel = channel[0]
+            channel_title = self._get_data_by_tag_name(channel, "title")
+            channel_description = self._get_data_by_tag_name(channel, "description")
+            items = channel.getElementsByTagName("item")
+            if channel_title:
+                md_text = f"# {channel_title}\n"
+            if channel_description:
+                md_text += f"{channel_description}\n"
+            for item in items:
+                title = self._get_data_by_tag_name(item, "title")
+                description = self._get_data_by_tag_name(item, "description")
+                pubDate = self._get_data_by_tag_name(item, "pubDate")
+                content = self._get_data_by_tag_name(item, "content:encoded")
+                
+                if title:
+                    md_text += f"## {title}\n"
+                if pubDate:
+                    md_text += f"Published on: {pubDate}\n"
+                if description:
+                    md_text += self._parse_content(description)
+                if content:
+                    md_text += self._parse_content(content)
+            
+            with open("rss.md", "wt", encoding="utf-8") as f:
+                f.write(md_text)
+            
+            return DocumentConverterResult(
+                title=channel_title,
+                text_content=md_text,
+            )
+        except BaseException as _:
+            print(traceback.format_exc())
+            return None
+        
+    def _parse_content(self, content: str) -> str:
+        """Parse the content of an RSS feed item"""
+        try:
+            # using bs4 because many RSS feeds have HTML-styled content
+            soup = BeautifulSoup(content, "html.parser")
+            return _CustomMarkdownify().convert_soup(soup)
+        except BaseException as _:
+            return content
+        
+    def _get_data_by_tag_name(self, element: minidom.Element, tag_name: str) -> Union[str, None]:
+        """Get data from first child element with the given tag name.
+        Returns None when no such element is found.
+        """
+        nodes = element.getElementsByTagName(tag_name)
+        if not nodes:
+            return None
+        fc = nodes[0].firstChild
+        if fc:
+            return fc.data
+        return None
 
 class WikipediaConverter(DocumentConverter):
     """Handle Wikipedia pages separately, focusing only on the main document content."""
@@ -1029,6 +1107,7 @@ class MarkItDown:
         # To this end, the most specific converters should appear below the most generic converters
         self.register_page_converter(PlainTextConverter())
         self.register_page_converter(HtmlConverter())
+        self.register_page_converter(RSSConverter())
         self.register_page_converter(WikipediaConverter())
         self.register_page_converter(YouTubeConverter())
         self.register_page_converter(BingSerpConverter())