A simple tool for cabal database query
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Command
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* diff: run the diff command between two different versions of a package.
* revdeps: print all reverse dependencies of a package.
* info: print all available versions of a package and some misc information.
* search-author: search all the database for match in the author field.
* search-maintainer: search all the database for match in the maintainer field.

check the original blog post for more information:

http://tab.snarc.org/posts/haskell/2013-03-13-cabal-db.html