fix: suggest the closest system for --platform

--platform retroarch --system sony-playstaton listed the first ten systems
of the alphabet. The warning now names the closest systems and the
command that lists the platform's own, as --system alone already did.

scripts/generate_pack.py

@@ -769,10 +769,14 @@ def generate_pack(
             if sid in system_filter or _norm_system_id(sid) in norm_filter
         }
         if not filtered:
-            available = sorted(pack_systems.keys())[:10]
+            hint = suggest_names(
+                system_filter,
+                sorted(pack_systems),
+                f"--platform {platform_name} --list-systems",
+            )
             print(
-                f"  WARNING: no systems matched filter {system_filter} "
-                f"(available: {', '.join(available)})"
+                f"  WARNING: {platform_name} has no system matching "
+                f"{', '.join(system_filter)}. {hint}"
             )
             return None
         pack_systems = filtered

tests/test_audit_regressions.py

@@ -5884,5 +5884,27 @@ class InstallerJsonKindsNeverOverwriteEachOther(unittest.TestCase):
         self.assertEqual(after, before)
 
 
+class PlatformSystemTypoGetsTheClosestNames(unittest.TestCase):
+    """--platform retroarch --system sony-playstaton listed the first ten
+    systems of the alphabet, 3do to coleco-colecovision."""
+
+    def test_the_hint_names_the_close_systems(self):
+        from scripts import generate_pack as gp
+
+        out = io.StringIO()
+        with tempfile.TemporaryDirectory(dir=TMP_ROOT) as tmp, \
+                contextlib.redirect_stdout(out):
+            result = gp.generate_pack(
+                "retroarch", str(ROOT / "platforms"), {"files": {}, "indexes": {}},
+                str(ROOT / "bios"), tmp, emulators_dir=str(ROOT / "emulators"),
+                system_filter=["sony-playstaton"], offline=True,
+            )
+        self.assertIsNone(result)
+        printed = out.getvalue()
+        self.assertIn("Did you mean: sony-playstation", printed)
+        self.assertIn("--platform retroarch --list-systems", printed)
+        self.assertNotIn("3do", printed)
+
+
 if __name__ == "__main__":
     unittest.main()