feat: accept platform system names in --system

The manifest now carries system_names, each system's native_system names from the platform's own file, and --system, its suggestions and --list-systems read them: --platform batocera --system psx installs sony-playstation.

scripts/manifestselect.py

@@ -17,8 +17,10 @@ from __future__ import annotations
 
 from dataclasses import dataclass
 
+import re
+
 import region as region_mod
-from common import _norm_system_id, sanitize_pack_path
+from common import _norm_system_id, native_layer, sanitize_pack_path
 from packextras import _extra_system_ids, _kept, extra_region_groups, system_spellings
 
 
@@ -118,3 +120,36 @@ class SelectionIndex:
         if priority is not None:
             out["priority"] = priority
         return out
+
+
+def _name_key(name: str) -> str:
+    """Letters and digits only, as the installer compares names."""
+    return re.sub(r"[^a-z0-9]", "", name.lower())
+
+
+def native_system_names(config: dict, systems: list[str]) -> dict[str, list[str]]:
+    """Per platform system, the names the platform's own file gives it.
+
+    A Batocera user knows PlayStation as `psx`, the folder under roms/, and
+    the platform YAML records that name as `native_system` on each file it
+    transcribes. Only the platform's own entries count (`native_layer`), a
+    name spelled like the system id adds nothing, and a name the platform
+    gives to two systems, or that reads as another system's id, names
+    neither.
+    """
+    native = native_layer(config) or {}
+    by_name: dict[str, set[str]] = {}
+    for sys_id, system in native.get("systems", {}).items():
+        if sys_id not in systems:
+            continue
+        for entry in system.get("files", []):
+            name = entry.get("native_system")
+            if isinstance(name, str) and name.strip():
+                by_name.setdefault(name.strip(), set()).add(sys_id)
+    ids = {_name_key(sys_id) for sys_id in systems}
+    out: dict[str, list[str]] = {}
+    for name, owners in by_name.items():
+        if len(owners) != 1 or _name_key(name) in ids:
+            continue
+        out.setdefault(next(iter(owners)), []).append(name)
+    return {sys_id: sorted(names) for sys_id, names in sorted(out.items())}