desktop-ui: surround sg1000a with CORE_SG ifdef

mia/medium/arcade.cpp

@@ -3,48 +3,36 @@ struct Arcade : Mame {
   auto extensions() -> vector<string> override { return {}; }
   auto load(string location) -> bool override;
   auto save(string location) -> bool override;
-  auto analyze(vector<u8>& rom) -> string;
-
-  Markup::Node info;
 };
 
 auto Arcade::load(string location) -> bool {
-  info = BML::unserialize(manifestDatabaseArcade(Medium::name(location)));
-  if(!info) return false;
-
-  vector<u8> rom = loadRoms(location, info, "maincpu");
-  if(!rom) return false;
+  manifest = manifestDatabaseArcade(Medium::name(location));
+  if(!manifest) return false;
 
-  this->location = location;
-  this->manifest = analyze(rom);
   auto document = BML::unserialize(manifest);
   if(!document) return false;
 
-  pak = new vfs::directory;
-  pak->setAttribute("board",  document["game/board" ].string());  
-  pak->setAttribute("title",  document["game/title"].string());
-  pak->setAttribute("region", document["game/region"].string());
-  pak->append("manifest.bml", manifest);
-  pak->append("program.rom",  rom);
+  //Sega SG-1000 based arcade
+  if(document["game/board"].string() == "sg1000a") {
+    vector<u8> rom = loadRoms(location, document, "maincpu");
+    if(!rom) return false;
 
-  return true;
+    this->location = location;
+
+    pak = new vfs::directory;
+    pak->setAttribute("board",  document["game/board" ].string());
+    pak->setAttribute("title",  document["game/title"].string());
+    pak->setAttribute("region", document["game/region"].string());
+    pak->append("manifest.bml", manifest);
+    pak->append("program.rom",  rom);
+
+    return true;
+  }
+
+  return false;
 }
 
 auto Arcade::save(string location) -> bool {
   return true;
 }
 
-auto Arcade::analyze(vector<u8>& rom) -> string {
-  string hash   = Hash::SHA256(rom).digest();
-
-  string s;
-  s += "game\n";
-  s +={"  name:  ", Medium::name(location), "\n"};
-  s +={"  title:  ", (info ? info["game/title"].string() : Medium::name(location)), "\n"};
-  s +={"  board:  ", (info ? info["game/board"].string() : "Arcade"), "\n"};
-  s += "    memory\n";
-  s += "      type: ROM\n";
-  s +={"      size: 0x", hex(rom.size()), "\n"};
-  s += "      content: Program\n";
-  return s;
-}