Add Steam darwin logic

cartridges/importer/source.py

@@ -125,6 +125,8 @@ class URLExecutableSource(ExecutableFormatSource):
                 return "start " + self.url_format
             case "linux":
                 return "xdg-open " + self.url_format
+            case "darwin":
+                return "open " + self.url_format
             case other:
                 raise NotImplementedError(
                     f"No URL handler command available for {other}"

cartridges/importer/steam_source.py

@@ -112,7 +112,7 @@ class SteamLocations(NamedTuple):
 class SteamSource(URLExecutableSource):
     source_id = "steam"
     name = _("Steam")
-    available_on = {"linux", "win32"}
+    available_on = {"linux", "win32", "darwin"}
     iterable_class = SteamSourceIterable
     url_format = "steam://rungameid/{game_id}"