Add --in-place mode to apply: rename and tag without moving files

When no output_dir is given (or --in-place is set), files are renamed
and tagged directly in the source directory instead of being moved into
a separate Jellyfin library hierarchy.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/musiksammlung/cli.py

@@ -133,19 +133,36 @@ def apply(
         ..., help="Verzeichnis mit gerippten Audiodateien"
     ),
     album_json: Path = typer.Argument(..., help="Album-JSON aus 'scan'"),
-    output_dir: Path = typer.Argument(..., help="Jellyfin-Musikverzeichnis"),
+    output_dir: Path | None = typer.Argument(
+        None, help="Jellyfin-Musikverzeichnis (weggelassen = --in-place)"
+    ),
     front: Path | None = typer.Option(None, "--front", help="Front-Cover-Bild"),
     back: Path | None = typer.Option(
         None, "--back", help="Rückseiten-Cover-Bild"
     ),
+    in_place: bool = typer.Option(
+        False, "--in-place", help="Dateien im Quellverzeichnis umbenennen/taggen"
+    ),
     dry_run: bool = typer.Option(
         False, "--dry-run", help="Nur anzeigen, nichts ändern"
     ),
 ) -> None:
-    """Album-JSON + Audiodateien → Jellyfin-Struktur aufbauen."""
+    """Album-JSON + Audiodateien → Jellyfin-Struktur aufbauen.
+
+    Ohne output_dir (oder mit --in-place): Dateien werden im Quellverzeichnis
+    umbenannt und getaggt, nicht in eine separate Bibliothek verschoben.
+    """
     raw = json.loads(album_json.read_text(encoding="utf-8"))
     album = Album.model_validate(raw)
 
+    # --in-place wenn kein output_dir angegeben
+    if output_dir is None:
+        in_place = True
+
+    if not in_place and output_dir is None:
+        typer.echo("Fehler: output_dir oder --in-place angeben.", err=True)
+        raise typer.Exit(1)
+
     # Prüfe Track-Anzahl pro Disc
     checks = check_disc_counts(album, input_dir)
     problems = [c for c in checks if not c.ok]
@@ -176,10 +193,11 @@ def apply(
         typer.echo(f"\nBitte {album_json} korrigieren und erneut aufrufen.", err=True)
         raise typer.Exit(1)
 
-    mapping = build_mapping(album, input_dir, output_dir)
+    mapping = build_mapping(album, input_dir, output_dir, in_place=in_place)
     typer.echo(f"Mapping: {len(mapping)} Dateien")
+    display_root = input_dir if in_place else output_dir
     for src, dst in mapping.items():
-        typer.echo(f"  {src.name} → {dst.relative_to(output_dir)}")
+        typer.echo(f"  {src.name} → {dst.relative_to(display_root)}")
 
     if dry_run:
         typer.echo("[DRY-RUN] Keine Änderungen vorgenommen.")
@@ -187,11 +205,11 @@ def apply(
 
     apply_mapping(mapping)
 
-    first_target = next(iter(mapping.values()))
-    if len(album.discs) > 1:
-        album_dir = first_target.parent.parent
+    if in_place:
+        album_dir = input_dir
     else:
-        album_dir = first_target.parent
+        first_target = next(iter(mapping.values()))
+        album_dir = first_target.parent.parent if len(album.discs) > 1 else first_target.parent
 
     typer.echo("Setze Audio-Tags...")
     tag_album(album, album_dir)

src/musiksammlung/organizer.py

@@ -86,20 +86,27 @@ def check_disc_counts(album: Album, input_dir: Path) -> list[DiscCheck]:
 def build_mapping(
     album: Album,
     input_dir: Path,
-    output_root: Path,
+    output_root: Path | None = None,
+    in_place: bool = False,
 ) -> dict[Path, Path]:
     """Berechnet das Quell→Ziel-Mapping für alle Audiodateien.
 
     Args:
         album: Validiertes Album-Modell
         input_dir: Verzeichnis mit den gerippten Dateien
-        output_root: Jellyfin-Musikverzeichnis
+        output_root: Jellyfin-Musikverzeichnis (wird bei in_place ignoriert)
+        in_place: Wenn True, Dateien nur innerhalb von input_dir umbenennen
 
     Returns:
         Dict von Quellpfad → Zielpfad
     """
-    artist_dir = _sanitize_filename(album.artist)
-    album_dir = output_root / artist_dir / _sanitize_filename(album.folder_name)
+    if in_place:
+        album_dir = input_dir
+    else:
+        assert output_root is not None, "output_root erforderlich wenn nicht in_place"
+        artist_dir = _sanitize_filename(album.artist)
+        album_dir = output_root / artist_dir / _sanitize_filename(album.folder_name)
+
     mapping: dict[Path, Path] = {}
     multi_disc = len(album.discs) > 1