Underscore filename schema, classical detection, NameToUnix post-processing

Pop schema:      TT_-_Artist_-_Title.ext
Classical schema: TT_-_Performer_-_Komponist_-_Werk[-_Orchester_Dirigent].ext
  triggered when albumartist ≠ track artist (pianist vs composer)

All spaces in names → underscores; separator _-_ between parts.
Missing parts (orchestra, conductor) are omitted.

models.py: added conductor/orchestra optional fields to TrackProposal.
executor.py: sanitize_dir_names() tries NameToUnix first, falls back to detox.
  Called after all renames in a directory are complete.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

executor.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 import csv
 import re
 import shutil
+import subprocess
 import sys
 from pathlib import Path
 from typing import Optional, List, Dict, Any
@@ -21,6 +22,9 @@ except ImportError:
 from cover_handler import embed_cover
 
 _SAFE_RE = re.compile(r'[<>:"/\\|?*\x00-\x1f]')
+_CLASSICAL_GENRES = re.compile(
+    r"(?i)class|baroque|romantic|renaissance|opera|symphony|chamber|concerto|sonata|oratorio"
+)
 REPORT_FIELDS = [
     "status", "album_dir", "track_path",
     "old_title", "new_title",
@@ -33,19 +37,62 @@ REPORT_FIELDS = [
 
 
 def _safe_name(s: str) -> str:
-    return _SAFE_RE.sub("_", s).strip(". ")
+    """Filesystem-safe name: illegal chars → '_', spaces → '_'."""
+    s = _SAFE_RE.sub("_", s)
+    return re.sub(r"\s+", "_", s).strip("._-")
 
 
-def _proposed_filename(proposal: TrackProposal, ext: str, albumartist: str = "") -> str:
+def _is_classical(albumartist: str, track_artist: str, genre: str) -> bool:
+    """
+    Classical schema applies when performer (albumartist) ≠ composer (track_artist),
+    which covers both 'real' classical music and jazz-on-classical-themes albums.
+    Genre keyword matching is used as additional signal but not required.
+    """
+    aa = (albumartist or "").casefold().strip()
+    ta = (track_artist or "").casefold().strip()
+    if not aa or aa in ("various artists", "unknown artist", "unknown"):
+        return False
+    if aa == ta:
+        return False
+    return True  # performer ≠ composer → classical naming
+
+
+def _proposed_filename(
+    proposal: TrackProposal,
+    ext: str,
+    albumartist: str = "",
+    genre: str = "",
+) -> str:
+    """
+    Pop/Default:  TT_-_Artist_-_Titel.ext
+    Klassik:      TT_-_Performer_-_Komponist_-_Titel[-_Orchester_Dirigent].ext
+
+    Separator zwischen Teilen: _-_
+    Leerzeichen innerhalb von Namen: _
+    Fehlende Teile werden weggelassen.
+    """
     tn = f"{proposal.track_number:02d}" if proposal.track_number else "00"
-    prefix = f"{proposal.disc_number}-{tn}" if proposal.disc_number and proposal.disc_number > 1 else tn
+    disc_prefix = f"{proposal.disc_number}-" if proposal.disc_number and proposal.disc_number > 1 else ""
+    prefix = f"{disc_prefix}{tn}"
+
     track_artist = _safe_name(proposal.artist or "Unknown")
     aa = _safe_name(albumartist)
     title = _safe_name(proposal.title or "Unknown")
-    # Include albumartist when it differs from track artist (e.g. pianist vs. composer)
-    if aa and aa.casefold() != track_artist.casefold() and aa.casefold() not in ("various artists", "unknown"):
-        return f"{prefix} - {aa} - {track_artist} - {title}{ext}"
-    return f"{prefix} - {track_artist} - {title}{ext}"
+
+    if _is_classical(aa, track_artist, genre):
+        # Klassik-Schema: Performer _-_ Komponist _-_ Werk [_-_ Orchester,Dirigent]
+        parts = [prefix, aa, track_artist, title]
+        # Orchester und Dirigent anhängen wenn vorhanden
+        extra = "_".join(filter(None, [
+            _safe_name(proposal.orchestra or ""),
+            _safe_name(proposal.conductor or ""),
+        ]))
+        if extra:
+            parts.append(extra)
+        return "_-_".join(parts) + ext
+    else:
+        # Pop/Default-Schema: Tracknummer _-_ Artist _-_ Titel
+        return f"{prefix}_-_{track_artist}_-_{title}{ext}"
 
 
 def backup_file(path: Path, backup_dir: Path) -> bool:
@@ -198,7 +245,11 @@ def execute_album(
                     cover_embedded = True
 
             if do_rename:
-                new_name = _proposed_filename(tp, tp.path.suffix, proposal.albumartist or "")
+                new_name = _proposed_filename(
+                    tp, tp.path.suffix,
+                    albumartist=proposal.albumartist or "",
+                    genre=proposal.genre or "",
+                )
                 candidate = tp.path.parent / new_name
                 if candidate != tp.path:
                     try:
@@ -231,9 +282,38 @@ def execute_album(
             "sources": ", ".join(proposal.sources),
         })
 
+    # Nach allen Umbenennungen: Verzeichnis Linux-kompatibel bereinigen
+    if do_rename and not dry_run:
+        sanitize_dir_names(proposal.album_dir)
+
     return stats
 
 
+def sanitize_dir_names(directory: Path) -> None:
+    """
+    Macht alle Dateinamen im Verzeichnis Linux-kompatibel.
+    Bevorzugt 'NameToUnix <dir>', fällt auf 'detox <file>' zurück.
+    """
+    name_to_unix = shutil.which("NameToUnix")
+    if name_to_unix:
+        try:
+            subprocess.run([name_to_unix, str(directory)], check=True, capture_output=True)
+            return
+        except subprocess.CalledProcessError as e:
+            print(f"  ⚠️ NameToUnix-Fehler: {e.stderr.decode(errors='replace').strip()}", file=sys.stderr)
+
+    detox = shutil.which("detox")
+    if detox:
+        for f in sorted(directory.rglob("*")):
+            if f.is_file():
+                try:
+                    subprocess.run([detox, str(f)], check=True, capture_output=True)
+                except subprocess.CalledProcessError as e:
+                    print(f"  ⚠️ detox-Fehler {f.name}: {e.stderr.decode(errors='replace').strip()}", file=sys.stderr)
+    else:
+        print("  ℹ️  Weder NameToUnix noch detox gefunden — Dateinamen nicht nachbereinigt.", file=sys.stderr)
+
+
 def write_report(report_data: List[Dict[str, Any]], report_path: Path) -> None:
     try:
         report_path.parent.mkdir(parents=True, exist_ok=True)