fix: lay out RetroPie standalone packages

RetroPie's YAML listed no standalone_cores, so every package was laid
out as a libretro core and the standalone files of amiberry, dolphin,
hatari, mame and ppsspp never reached the pack. Packages without the
lr- prefix (bar the retroarch frontend) are now standalone, and names
shipped both ways are dual-mode.

platforms/retropie.yml

@@ -186,6 +186,132 @@ cores:
 - yabause
 - yquake2
 - zesarux
+standalone_cores:
+- advmame
+- advmame-0.94
+- advmame-1.4
+- ags
+- alephone
+- amiberry
+- atari800
+- basilisk
+- cannonball
+- capricerpi
+- cdogs-sdl
+- cgenius
+- coolcv
+- daphne
+- darkplaces-quake
+- dgen
+- dolphin
+- dosbox
+- dosbox-sdl2
+- dosbox-staging
+- drastic
+- dsda-doom
+- dxx-rebirth
+- eduke32
+- fbzx
+- flycast
+- frotz
+- fs-uae
+- fuse
+- gemrb
+- giana
+- gngeopi
+- gpsp
+- gzdoom
+- hatari
+- hypseus
+- ionfury
+- ioquake3
+- jumpnbump
+- jzintv
+- kodi
+- linapple
+- lincity-ng
+- love
+- love-0.10.2
+- lzdoom
+- mame
+- mame4all
+- micropolis
+- minecraft
+- minivmac
+- mupen64plus
+- mysticmine
+- np2pi
+- openblok
+- openbor
+- openmsx
+- openpht
+- openttd
+- opentyrian
+- oricutron
+- osmose
+- pcsx-rearmed
+- pcsx2
+- pifba
+- pisnes
+- ppsspp
+- ppsspp-1.5.4
+- px68k
+- quake3
+- quasi88
+- redream
+- reicast
+- rpix86
+- scummvm
+- scummvm-sdl1
+- sdlpop
+- sdltrs
+- simcoupe
+- smw
+- snes9x
+- solarus
+- splitwolf
+- srb2
+- steamlink
+- stella
+- stratagus
+- supermodel3
+- supertux
+- ti99sim
+- ti99sim-sdl1
+- tyrquake
+- uae4all
+- uae4arm
+- uqm
+- vice
+- vvvvvv
+- wolf4sdl
+- xm7
+- xrick
+- xroar
+- yabasanshiro
+- yquake2
+- zesarux
+dual_mode_cores:
+- atari800
+- dolphin
+- dosbox
+- flycast
+- fuse
+- gpsp
+- hatari
+- mame
+- mupen64plus
+- pcsx-rearmed
+- ppsspp
+- px68k
+- quasi88
+- scummvm
+- snes9x
+- stella
+- tyrquake
+- uae4arm
+- vice
+- xrick
 launchers:
 - emulator: advmame-0.94
   package: advmame-0.94

scripts/scraper/retropie_scraper.py

@@ -146,7 +146,13 @@ class Scraper(BaseScraper):
         """
         # A libretro package is lr-<core>; a standalone package is named
         # after the emulator itself.
-        cores = sorted({module.removeprefix("lr-") for module in self.module_ids()})
+        modules = self.module_ids()
+        cores = sorted({module.removeprefix("lr-") for module in modules})
+        libretro = {m.removeprefix("lr-") for m in modules if m.startswith("lr-")}
+        # The retroarch package is the frontend that runs the lr- cores.
+        standalone = sorted(
+            m for m in modules if not m.startswith("lr-") and m != "retroarch"
+        )
         if not self._version:
             raise ValueError(f"{self.url}: no __version in {_VERSION_FILE}")
 
@@ -158,6 +164,9 @@ class Scraper(BaseScraper):
             "source": self.url,
             "base_destination": "BIOS",
             "cores": cores,
+            "standalone_cores": standalone,
+            # Shipped both as lr-<name> and as <name>: each layout gets its files.
+            "dual_mode_cores": [m for m in standalone if m in libretro],
             "launchers": extract_launchers(self._scripts),
         }
 

tests/test_scraper_contract.py

@@ -289,6 +289,22 @@ class RetroPiePackageList(unittest.TestCase):
         self.assertEqual(config["inherits"], "retroarch")
         self.assertEqual(config["base_destination"], "BIOS")
 
+    def test_a_package_built_outside_libretro_runs_standalone(self):
+        """hatari ships as lr-hatari and as hatari: both layouts are read."""
+        scraper = self._scraper(
+            {
+                "retropie_packages.sh": '__version="4.8.12"\n',
+                "scriptmodules/libretrocores/lr-hatari.sh": 'rp_module_id="lr-hatari"\n',
+                "scriptmodules/libretrocores/lr-mgba.sh": 'rp_module_id="lr-mgba"\n',
+                "scriptmodules/emulators/hatari.sh": 'rp_module_id="hatari"\n',
+                "scriptmodules/emulators/openmsx.sh": 'rp_module_id="openmsx"\n',
+                "scriptmodules/emulators/retroarch.sh": 'rp_module_id="retroarch"\n',
+            }
+        )
+        config = scraper.generate_platform_yaml()
+        self.assertEqual(config["standalone_cores"], ["hatari", "openmsx"])
+        self.assertEqual(config["dual_mode_cores"], ["hatari"])
+
     def test_the_version_is_the_one_the_setup_script_declares(self):
         scraper = self._scraper(
             {

wiki/adding-a-platform.md

@@ -150,11 +150,19 @@ scriptmodule, and any manual change is overwritten on the next scrape.
 The `cores` field determines which emulator profiles are resolved for this platform.
 Three strategies exist:
 
-- **Explicit list**: `cores: [beetle_psx, dolphin, ...]` - match by profile key name.
-  Used by Batocera, Recalbox, RetroBat, RomM.
+- **Explicit list**: `cores: [beetle_psx, dolphin, ...]` - match by profile key name
+  or by any name in a profile's `cores:`. Used by Batocera, Recalbox, RetroBat, RomM,
+  RetroPie, EmuDeck, RetroDECK, ROCKNIX. A list that names `retroarch` (the last four)
+  also takes every libretro profile.
 - **all_libretro**: `cores: all_libretro` - include every profile with `type: libretro`
-  or `type: standalone + libretro`. Used by RetroArch, Lakka, RetroPie.
-- **Omitted**: fallback to system ID intersection. Used by EmuDeck.
+  or `type: standalone + libretro`. Used by RetroArch and Lakka.
+- **Omitted**: fallback to system ID intersection.
+
+Two lists say how each resolved emulator is laid out. `standalone_cores` names the
+ones the platform launches as standalone apps: their files go to `standalone_path`.
+`dual_mode_cores` names those it launches both ways (RetroPie packages `lr-hatari`
+and `hatari`): both layouts are packed. A profile without a standalone build keeps
+its libretro layout whatever the platform calls it.
 
 ### Optional fields