Fixups for old Python versions

Author: athre0z

assets/amalgamate.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 
 from pathlib import Path
+from typing import List, Set
 from glob import glob
 from shutil import rmtree
 
@@ -18,9 +19,25 @@
 FILE_HEADER = ['// DO NOT EDIT. This file is auto-generated by `amalgamate.py`.', '']
 
 
+# Python versions before 3.10 don't have the root_dir argument for glob, so we 
+# crudely emulate it here.
+def glob_in_dir(
+    pattern: str,
+    root_dir: Path,
+):
+    cwd = os.getcwd()
+    root_dir = root_dir.resolve()
+    os.chdir(root_dir)
+    try:
+        for path in glob(pattern, recursive=True):
+            yield Path(root_dir) / path
+    finally:
+        os.chdir(cwd)
+
+
 def find_include_path(
     include: str,
-    search_paths: list[Path],
+    search_paths: List[Path],
 ) -> Path:
     for search_path in search_paths:
         path = search_path / include
@@ -33,10 +50,10 @@ def find_include_path(
 def merge_headers(
     *,
     header: str,
-    search_paths: list[Path],
-    covered_headers: set[Path],
-    stack: list[str],
-) -> list[str]:
+    search_paths: List[Path],
+    covered_headers: Set[Path],
+    stack: List[str],
+) -> List[str]:
     # Locate and load header contents.
     path = find_include_path(header, search_paths)
     with path.open() as f:
@@ -84,13 +101,13 @@ def merge_headers(
     return filtered
 
 
-def merge_sources(*, source_dir: Path, covered_headers: set[Path]):
+def merge_sources(*, source_dir: Path, covered_headers: Set[Path]):
     output = [
         '#include <Zydis.h>',
         '',
     ]
 
-    for source_file in glob('**/*.c', root_dir=source_dir, recursive=True):
+    for source_file in glob_in_dir('**/*.c', source_dir):
         print(f'Processing source file "{source_file}"')
 
         # Print some comments to show where the code is from.
@@ -163,3 +180,4 @@ def main():
 
 if __name__ == '__main__':
     main()
+