I am pleased to announce the first public release of the virthualenv tool. What is it? ========= virthualenv is a tool (inspired by Python's virtualenv) to create isolated Haskell environments. What does it do? ============== It creates a sandboxed environment in a .virthualenv/ sub-directory of your project, which, when activated, allows you to use regular Haskell tools (ghc, ghci, ghc-pkg, cabal) to manage your Haskell code and environment. It's possible to create an environment, that uses different GHC version than your currently installed. Very simple Emacs integration mode is included. Basic usage ========== First, choose a directory where you want to keep your sandboxed Haskell environment, usually a good choice is a directory containing your cabalized project (if you want to work on a few projects (perhaps an app and its dependent library), just choose any of them, it doesn't really matter). Enter that directory:
cd ~/projects/foo
Next, create your new isolated Haskell environment (this is a one time only (per environment) step):
virthualenv
Now, every time you want to use this environment, you have to activate it:
source .virthualenv/bin/activate
That's it! Now it's possible to use all regular Haskell tools like usual, but it won't affect your global/system's Haskell environment, and also your per-user environment (from ~/.cabal and ~/.ghc) will stay the same. All cabal-installed packages will be private to this environment, and also the external environments (global and user) will not affect it (this environment will only inherit very basic packages, mostly ghc and Cabal and their deps). When you're done working with this environment, enter command 'deactivate', or just close the current shell (with exit).
deactivate
More info ======== Hackage: http://hackage.haskell.org/package/virthualenv Github: https://github.com/Paczesiowa/virthualenv Readme: https://github.com/Paczesiowa/virthualenv/blob/master/README.md Blog post: http://paczesiowa.blogspot.com/2011/11/virtual-haskell-environment.html Regards, Bartosz Ćwikłowski