I am learning to use cabal for my code. Just when I start, I met a question, is there an easy way to find out what packages my code depends?
If you've managed to get your code to compile, ghc --show-iface Main.hi is perhaps the easiest way (ghc --make and ghci will also report package dependencies as they encounter them). If you're looking for the package for a particular module, ghc-pkg can help ghc-pkg find-module Control.Concurrent c:/ghc/ghc-6.10.3\package.conf: base-3.0.3.1, base-4.1.0.0 ghc-pkg find-module Data.Map c:/ghc/ghc-6.10.3\package.conf: containers-0.2.0.1 If you're looking for a minimal set of imports before hunting for packages, ghc's -ddump-minimal-imports will create a file Main.imports with that information. You could then run ghc-pkg find-module over that list. These are not the only options. Perhaps the available tools need to be advertized more?-) Claus