feat: add --group-by manufacturer for split packs

scripts/common.py

@@ -655,6 +655,21 @@ MANUFACTURER_PREFIXES = (
 )
 
 
+def derive_manufacturer(system_id: str, system_data: dict) -> str:
+    """Derive manufacturer name for a system.
+
+    Priority: explicit manufacturer field > system ID prefix > 'Other'.
+    """
+    mfr = system_data.get("manufacturer", "")
+    if mfr and mfr not in ("Various", "Other"):
+        return mfr.split("|")[0].strip()
+    s = system_id.lower().replace("_", "-")
+    for prefix in MANUFACTURER_PREFIXES:
+        if s.startswith(prefix):
+            return prefix.rstrip("-").title()
+    return "Other"
+
+
 def _norm_system_id(sid: str) -> str:
     """Normalize system ID for cross-platform matching.
 

scripts/generate_pack.py

@@ -902,6 +902,20 @@ def _system_display_name(system_id: str) -> str:
     return "_".join(p.title() for p in parts if p)
 
 
+def _group_systems_by_manufacturer(
+    systems: dict[str, dict],
+    db: dict,
+    bios_dir: str,
+) -> dict[str, list[str]]:
+    """Group system IDs by manufacturer for --split --group-by manufacturer."""
+    from common import derive_manufacturer
+    groups: dict[str, list[str]] = {}
+    for sid, sys_data in systems.items():
+        mfr = derive_manufacturer(sid, sys_data)
+        groups.setdefault(mfr, []).append(sid)
+    return groups
+
+
 def generate_split_packs(
     platform_name: str,
     platforms_dir: str,