Mac OS X

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There is also now the Mac OS X Strike Force that aims to improve using Haskell on OS X.

The Haskell Platform

There are Mac OS X installers of the full Haskell Platform development environment. We recommend it:

GHC

Important notes

To get the most out of your GHC environment, you should '~/.cabal/bin' to your PATH environment variable before the path where you have GHC installed. This will allow you to get and use cabal-updates, as well as other programs shipped with GHC like hsc2hs.

In you ~/.profile, add the line:

export PATH="~/.cabal/bin:$PATH";

Mac OS X 10.5 (Leopard)

To install GHC on Mac OS X 10.5 (Leopard), there are the following options:

install the Haskell Platform
install MacPort's ghc package

Mac OS X 10.6 (Snow Leopard)

Mac OS X 10.6.x (Snow Leopard) works with GHC.

Install the Haskell Platform

To uninstall ghc call: sudo /Library/Frameworks/GHC.framework/Tools/Uninstaller

HUGS

install MacPort's hugs98 package.

Installing libraries with external C bindings

Haskell libraries are installed with the cabal command line tool.

Some libraries depend on external C libraries, which are best installed with MacPorts. However, you have to tell cabal to include the /opt/local/ directories when searching for external libraries. The following shell script does that by wrapping the cabal utility

   > cat cabal-macports
   #!/bin/bash
   export CPPFLAGS=-I/opt/local/include
   export LDFLAGS=-L/opt/local/lib
   cabal $@ --extra-include-dirs=/opt/local/include \
            --extra-lib-dirs=/opt/local/lib

   > cabal-macports install foobar

Editors with Haskell support

Open Source

AquaMacs, a graphical Emacs version
Eclipse with the EclipseFP plugin
Emacs, is installed on every Mac
Leksah
MacVim, a graphical Vim version
Vim, is installed on every Mac
Yi (written in Haskell itself!), is available through cabal-install

Commercial

SubEthaEdit:

TextMate:

and Smultron:

TextEdit is Mac's default text editor, a very basic editor that works fine for most uses, you must however be careful to put it into plain text mode using the Format menu.

Shipping Installable Haskell Applications

mkbndl builds installable Mac OSX applications from your Haskell project.

Links

Using Haskell in an Xcode Cocoa project; a description of how to add a Haskell module (callable from C) to an Xcode/Cocoa/Interface builder project on your Mac.
Mac OS X Common Installation Paths: an effort to standardize where things go on a Mac OS X installation