Expand env vars

src/rtl_manifest/rtl_manifest.py

@@ -3,6 +3,8 @@ import argparse
 from typing import List, Tuple
 import pathlib
 
+import os
+
 
 def rtl_manifest_main():
     parser = argparse.ArgumentParser(
@@ -38,7 +40,7 @@ def parse(source_file: str) -> Tuple[List[str], List[str]]:
         base_dir = pathlib.Path(source_file).parent
         with open(source_file, "r") as file:
             for line in file:
-                path = line.strip()
+                path = os.path.expandvars(line.strip())
                 if path.startswith("#"):
                     continue
                 if path == "":