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Learn about the Elm programming language at elm-lang.org.
Install
On Mac OSX
Use the installer and you are done. Let us know on the list if you have any trouble.
On any platform
Download the Haskell Platform 2012.2.0.0. Elm definitely works with GHC 7.4, so newer versions of the Haskell Platform may work too.
Once the Haskell Platform is installed:
cabal update
cabal install elm
cabal install elm-server
Using Elm
To use elm and elm-server you may need to add a new directory to your PATH.
Cabal should tell you where your executables are located upon successful installation.
For me, the executables were placed in /home/evan/.cabal/bin which I
appended to the end of my PATH variable in my .bashrc file.
See this tutorial if you are new to changing your PATH in Unix/Linux.
Test Project
Now we will create a simple Elm project. The following commands will set-up a very basic project and start the Elm server.
mkdir helloElm
cd helloElm
echo import Mouse > Main.elm
echo main = lift asText Mouse.position >> Main.elm
elm-server
The first two commands create a new directory and navigate into it. The echo
commands place a simple program into Main.elm. Do this manually if you do not
have echo. The final command starts the Elm server at localhost:8000,
allowing you to navigate to Main.elm and see your first program in action.
Wrap up
The elm package provides support for compilation of Elm code directly in Haskell and QuasiQuoting.
Check it out on Hackage if you are interested.
If you are stuck, email the list or ask a question in the #Elm IRC channel.