Haskell: Correct practice to specify version in source?

Question

What is the best/correct practice to specify version within your source code tree? What I want is, for instance, to put VERSION file in the top level of the source tree and

Answer 1

Cabal automatically generates a module for each package named Paths_packagename. Just import this package and look at the version value it exports.

Edit: For example:

module Data.Blah where

import Paths_t

func :: IO ()
func = print version

And an example run:

> func
Version {versionBranch = [0,1], versionTags = []}

Be sure to put Paths_packagename in your Other-Modules section of the cabal file.