feat: show chapter in console when splitting m4b into chapters

1 files changed, 13 insertions, 4 deletions

diff --git a/converter/audio.py b/converter/audio.py
index f1c508c..5a7ec35 100644
--- a/converter/audio.py
+++ b/converter/audio.py
@@ -210,14 +210,17 @@ def _collect_chunk_files(total_chunks: int,
 
 def combine_chunks(total_chunks: int, output_path: Path,
                    chunk_results: Optional[Dict[int, Optional[Path]]] = None,
-                   speed: float = 1.0, output_format: str = "mp3") -> bool:
+                   speed: float = 1.0, output_format: str = "mp3",
+                   intermediate: bool = False) -> bool:
     """Combine audio chunks into the final audiobook using ffmpeg's concat demuxer.
 
     ``chunk_results`` maps chunk numbers to the audio file each chunk produced
     (None for failed chunks); failed and missing chunks are skipped. When
     ``speed`` differs from 1.0, an additional speed-adjusted copy is written
     next to the normal-speed file. Chunks are streamed by ffmpeg, so the whole
-    book is never held in memory.
+    book is never held in memory. Set ``intermediate`` for scratch chapter
+    audio on the way to a larger output (e.g. a chaptered m4b) so save
+    messages don't present it as the final audiobook.
     """
     if shutil.which("ffmpeg") is None or shutil.which("ffprobe") is None:
         logger.error("ffmpeg and ffprobe are required to combine audio chunks (install ffmpeg)")
@@ -265,8 +268,14 @@ def combine_chunks(total_chunks: int, output_path: Path,
         if not duration_ok:
             return False
 
-        logger.info("Audiobook saved: %s (%d/%d chunks)", output_path, len(chunk_files), total_chunks)
-        print(f"[INFO] Saved audiobook: {output_path.name} ({len(chunk_files)}/{total_chunks} chunks)")
+        if intermediate:
+            logger.info("Chapter audio saved (intermediate): %s (%d/%d chunks)",
+                        output_path, len(chunk_files), total_chunks)
+            print(f"[INFO] Saved chapter audio (intermediate): {output_path.name} "
+                  f"({len(chunk_files)}/{total_chunks} chunks)")
+        else:
+            logger.info("Audiobook saved: %s (%d/%d chunks)", output_path, len(chunk_files), total_chunks)
+            print(f"[INFO] Saved audiobook: {output_path.name} ({len(chunk_files)}/{total_chunks} chunks)")
 
         if speed_path is not None:
             logger.info("Saved speed-adjusted audiobook (%gx): %s", speed, speed_path)