Determining file dependencies and rule provenance in Hadrian

The make build system has a few important introspection features which are invaluable when working on the build system:

• make -p allows one to easily dump the entire database, which can be useful in conjunction with grep to identify where rules are defined
• make -n allows one to dump all of the commands necessary to build a particular file and its dependencies
• make -nW makes it easy to determine which files a particular file would affect

I've been unable to work out how to accomplish any of this with hadrian. Ideally we would like to have a hadrian mode to query the rulebase for which rule is responsible for building a particular target. This would include its source location and dependencies.

It's possible that these already exist but it's not clear from the help message in what form.