[Haskell-cafe] Recommended way to install, use and maintain haskell tools on OS X

[Carter Schonwald]

ignore all the stuff about haskell platform.

use this http://ghcformacosx.github.io/

and the Library /  ~/Library stuff is wholely an artifact of haskell
platform. use the vanilla  cabal config setup that uses ~/.cabal and
entails putting ~/.cabal/bin in your PATH

use cabal sandbox for application dev that you plan to deploy elsewhere /
share (because you'll easily wind up having multiple projects going on at
once)
and use normal cabal install (into ~/.cabal) otherwise.




On Sun, Oct 19, 2014 at 7:42 AM, Nicola Gigante <nicola.gigante at gmail.com>
wrote:

> Hi
>
> I know this question might be a little old, but I happen to have a from
> scratch
> installation of OS X (yosemite) on my machine and I want to install the
> haskell
> tools in the currently best way.
>
> So I summarize the options that I understand are available:
>
> 1) A non-option first: the Homebrew formula for haskell-platform is no
> longer
> available, but…
> 2) There are formulas for GHC (7.8.x) and cabal, so I can install those and
> install the other packages with the homebrew cabal.
> 3) I can install the binary distribution of the Haskell Platform for OS X
> directly
> from the website, and then install any needed package with cabal.
> 4) I’ve heard of Nix, what is this all about?
> 5) Installing manually the binary distributions of ghc and cabal. No
> thanks.
>
> That said, what is the recommended way to manage packages once I have
> cabal and ghc?
>
> 1) Installing everything locally into ~/Library/Haskell, which afaik is
> the default
> behavior of cabal. That also means having ~/Library/Haskell/bin in the
> PATH.
> But do I have to also have ~/.cabal/bin in the PATH? Why having two
> different
> local bin directories? What happens to the packages installed by haskell
> platform
> system-wide? They are left there, shadowed by the local ones, and never
> again
> touched nor updated?
>
> 2) Installing everything globally, changing the cabal configuration to
> make it
> the default. Afaik bad idea, but then I don’t have obsoleted packages
> installed
> system-wide.
>
> 3) Installing nothing, and relying on sandboxes to install exactly what is
> needed
> for any single package I need. This option is still a bit mysterious to me.
> 3a) If I need to install a package I need for development, I do cabal
> sandbox init
> in my source tree and then if I install something from inside it, cabal
> installs it
> in the sandbox. Am I correct?
> 3a) If I need to install a package I need to _use_, instead, what to do?
>
>
> Sorry for the confusion and thanks for the clarification.
>
> Bye,
> Nicola
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