parallelize creat media function call

audiobook_metadata/combine_audiobookmedia_to_m4b.py

@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 
 from __future__ import annotations
+from concurrent.futures import ProcessPoolExecutor, as_completed
 
 import argparse
 import subprocess
@@ -170,6 +171,15 @@ def find_book_dirs(root: Path) -> tuple[list[Any], int]:
 
     return sorted(directories), size
 
+def process_book(args):
+    target, book_dir = args
+    try:
+        create_m4b(target, book_dir)
+        return book_dir, None
+    except Exception as exc:
+        return book_dir, str(exc)
+
+
 def main() -> None:
     parser = argparse.ArgumentParser()
     parser.add_argument(
@@ -200,15 +210,15 @@ def main() -> None:
     if name != "y":
         log_message(f"Aborted")
         exit(0)
-    size = 0
+
     # Root folder containing many books
-    for book_dir in book_dir_set:
-        size += sum(file.stat().st_size for pattern in ("*.mp3", "*.m4a", "*.m4b") for file in book_dir.glob(pattern))
-        print(f"{size / 1024**3:07.2f}/{library_size/ 1024**3:07.2f} - {size/library_size*100:.2f}% ... ",end="")
-        try:
-            create_m4b(target,book_dir)
-        except Exception as exc:
-            log_message(f"{RED}[ERROR]{RESET} {book_dir}: {exc}")
+    with ProcessPoolExecutor(max_workers=8) as executor:
+        for book_dir, error in executor.map(
+                process_book,
+                ((target, book_dir) for book_dir in book_dir_set),
+        ):
+            if error:
+                log_message(f"{RED}[ERROR]{RESET} {book_dir}: {error}")
 
 
 if __name__ == "__main__":