Fix debug message

Author: javiergs

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>javiergs</groupId>
     <artifactId>tulip</artifactId>
-    <version>v2.0</version>
+    <version>v2.2</version>
 
     <name>TULIP</name>
     <description>Teaching Utilities for Learning Individual Practices</description>

src/main/java/javiergs/tulip/GitHubHandler.java

@@ -196,9 +196,25 @@ public List<String> listFolders(String owner, String repo, String branch, String
 	 * @throws IOException if the API call fails or the response cannot be decoded
 	 * @throws IllegalArgumentException if the URL does not point to a directory
 	 */
+	//public List<String> listFilesRecursive(String startDirUrl) throws IOException {
+	//	URLHelper u = URLHelper.parseGitHubUrl(startDirUrl);
+	//	if (u.isBlob) throw new IllegalArgumentException("URL points to a file, not a directory: " + startDirUrl);
+	//	return listFilesRecursive(u.owner, u.repo, u.ref, u.path);
+	//}
+	
 	public List<String> listFilesRecursive(String startDirUrl) throws IOException {
 		URLHelper u = URLHelper.parseGitHubUrl(startDirUrl);
-		if (u.isBlob) throw new IllegalArgumentException("URL points to a file, not a directory: " + startDirUrl);
+		
+		// If the user just gave "https://github.com/owner/repo" (no /tree/ or /blob/)
+		// assume branch "main" at repo root.
+		if (!u.isBlob && (u.ref == null || u.ref.isBlank())) {
+			return listFilesRecursive(u.owner, u.repo, "main", "");
+		}
+		
+		if (u.isBlob) {
+			throw new IllegalArgumentException("URL points to a file, not a directory: " + startDirUrl);
+		}
+		
 		return listFilesRecursive(u.owner, u.repo, u.ref, u.path);
 	}