Is there a nice way to get the build type of a package (catkin vs cmake)?

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I have a mix of pure cmake and catkin packages in my workspace. The cmake packages have a package.xml so that catkin will build them. I'd like a nice way to easily identify whether or not a package is a regular cmake or a catkin package. So far, I can only think of running something like cat package.xml | grep cmake, but I'd like to know if there's a nicer extension in catkin_tools or otherwise. For example, the following might be nice: catkin list --build-type --this