All of elm-lang.org is written in Elm. This repo contains all that source code, both for the frontend and for the backend.
You can also use this to run elm-lang.org/try locally.
First get the Elm developer workflow setup by reading the build from source instructions, then running this script with runhaskell BuildFromSource.hs master. Be aware that this is all the actively developed branches, so things may be in an intermediate state.
Then in the Elm-Platform/master/ directory, run these commands:
git clone https://github.com/elm-lang/elm-lang.org.git
cd elm-lang.org
git checkout master
cabal sandbox init --sandbox ../.cabal-sandbox
cabal install --only-dependencies
cabal configure
cabal build
./dist/build/run-elm-website/run-elm-websiteGreat! You should be set up with elm-lang.org running at localhost:8000/.
You can run cabal clean to clear out all cached build information and start fresh.