Nix expr: Add `hawkSourceInfo.mainAppFilename`

Dist/historical.nix

@@ -210,6 +210,7 @@ in {
 		hasAssetsInOutput = !isVersionAtLeast "2.6.1" version;
 		hasFFmpegPatch_e68a49aa5 = isVersionAtLeast "2.9.2" version; # with e68a49aa5, downloading *and running* FFmpeg finally works; TODO use FFmpeg from Nixpkgs since it's a stable version (4.4.1)
 		hasMiscTypeCheckerPatch_6afb3be98 = isVersionAtLeast "2.6.2" version;
+		mainAppFilename = "EmuHawk.exe"; # for emuhawk-mono-wrapper launch script
 		neededExtraManagedDeps = neededExtraManagedDepsApprox;
 		needsLibGLVND = false; # true iff not using nixGL (i.e. on NixOS) AND using the OpenGL renderer (the default option)
 		needsSDL = isVersionAtLeast "2.9.2" version;

Dist/launch-scripts.nix

@@ -66,8 +66,9 @@
 	in writeShellScript "emuhawk-mono-wrapper" ''
 		set -e
 
-		if [ ! -e "$BIZHAWK_HOME/EmuHawk.exe" ]; then
-			printf "no such file: %s\n" "$BIZHAWK_HOME/EmuHawk.exe"
+		mainAppPath="$BIZHAWK_HOME/${bizhawkAssemblies.hawkSourceInfo.mainAppFilename}"
+		if [ ! -e "$mainAppPath" ]; then
+			printf "no such file: %s\n" "$mainAppPath"
 			exit 1
 		fi
 
@@ -87,8 +88,7 @@
 		fi
 		printf "(capturing output in %s/EmuHawkMono_last*.txt)\n" "$PWD" >&2
 		exec '${redirectOutputToFiles}' EmuHawkMono_laststdout.txt EmuHawkMono_laststderr.txt \
-			'${lib.getBin bizhawkAssemblies.mono}/bin/mono' \
-				"$BIZHAWK_HOME/EmuHawk.exe" --config=config.json "$@"
+			'${lib.getBin bizhawkAssemblies.mono}/bin/mono' "$mainAppPath" --config=config.json "$@"
 	'';
 in {
 	inherit emuhawk;