Add macOS packaging script

package-macos.sh

@@ -0,0 +1,33 @@
+#!/bin/sh
+
+if [ -z "$1" ]; then
+	echo "Please pass version string as the first argument.\nEx:\n$0 v1.3.1"
+	exit 1
+fi
+
+if [ ! -d "macos-dist/MarbleBlast Platinum.app" ]; then
+	cp -r "macos-dist/MarbleBlast Platinum.app.in" "macos-dist/MarbleBlast Platinum.app" || exit $?
+else
+	cp "macos-dist/MarbleBlast Platinum.app.in/Contents/Info.plist" "macos-dist/MarbleBlast Platinum.app/Contents/Info.plist"  || exit $?
+fi
+
+# Replace version string
+sed -i "" -e "s/@VERSION@/$1/" "macos-dist/MarbleBlast Platinum.app/Contents/Info.plist" || exit $?
+
+# Copy binary
+cp native/marblegame "macos-dist/MarbleBlast Platinum.app/Contents/MacOS/marblegame" || exit $?
+cd "macos-dist/MarbleBlast Platinum.app/Contents/MacOS/"
+install_name_tool -change ui.hdll @rpath/ui.hdll \
+	-change openal.hdll @rpath/openal.hdll \
+	-change fmt.hdll @rpath/fmt.hdll \
+	-change sdl.hdll @rpath/sdl.hdll \
+	-change libhl.dylib @rpath/libhl.dylib \
+	-change libSDL2-2.0.0.dylib @rpath/libSDL2-2.0.0.dylib \
+	-add_rpath @executable_path/../Frameworks marblegame || exit $?
+
+echo "Tried to update dylib references in executable."
+echo "Please use otool -L to ensure that the libraries are referenced as @rpath. This is usually an issue with libSDL2-2.0.0.dylib"
+echo
+echo "Please fill macos-dist/MarbleBlast Platinum.app/Contents/Frameworks with the dylibs,"
+echo "and use install_name_tool to update their IDs to match with marblegame executable."
+