fix: handle Windows-style paths in fname_to_url function

aider/help.py

@@ -44,6 +44,9 @@ def fname_to_url(filepath):
     index = "index.md"
     md = ".md"
 
+    # Convert backslashes to forward slashes for consistency
+    filepath = filepath.replace('\\', '/')
+
     # Convert to Path object for easier manipulation
     path = Path(filepath)
 
@@ -52,29 +55,29 @@ def fname_to_url(filepath):
 
     # Find the 'website' part in the path
     try:
-        website_index = parts.index(website)
+        website_index = [p.lower() for p in parts].index(website.lower())
     except ValueError:
         return ""  # 'website' not found in the path
 
     # Extract the part of the path starting from 'website'
-    relevant_parts = parts[website_index + 1 :]
+    relevant_parts = parts[website_index + 1:]
 
     # Handle _includes directory
-    if relevant_parts and relevant_parts[0] == "_includes":
+    if relevant_parts and relevant_parts[0].lower() == "_includes":
         return ""
 
     # Join the remaining parts
-    url_path = "/".join(relevant_parts)
+    url_path = '/'.join(relevant_parts)
 
     # Handle index.md and other .md files
-    if url_path.endswith(index):
-        url_path = url_path[: -len(index)]
-    elif url_path.endswith(md):
-        url_path = url_path[: -len(md)] + ".html"
+    if url_path.lower().endswith(index.lower()):
+        url_path = url_path[:-len(index)]
+    elif url_path.lower().endswith(md.lower()):
+        url_path = url_path[:-len(md)] + ".html"
 
     # Ensure the URL starts and ends with '/'
-    url_path = url_path.strip("/")
-
+    url_path = url_path.strip('/')
+    
     return f"https://aider.chat/{url_path}"