option for reading header

creader/file_utils.py

@@ -0,0 +1,14 @@
+from .ClusterFile import ClusterFile
+from .RawFile import RawFile
+from pathlib import Path
+
+
+def open_file(fname):
+    """Convenience function to open files"""
+    fname = Path(fname)
+    if fname.suffix == '.clust':
+        return ClusterFile(fname)
+    elif fname.suffix == '.json':
+        return RawFile(fname)
+    else:
+        raise ValueError('unsupported file type')