aycanirican / nixit

Build my haskell project using nix

nixit

Build my haskell executable using nix.

Usage

• You are in your project's directory

    cd $TMP
    mkdir project1; cd project1
  

• You have a proper Main.hs file like this:

    module Main where
    
    main :: IO ()
    main = print "5 more minutes...Done."
  

• Optionally you write all haskell dependencies (one for each line) in a file .nixit.deps like:

    aeson
    servant-client
    lens
  

Then you can have your executable with:

nix build -f https://github.com/aycanirican/nixit/archive/master.tar.gz \
  --arg    src  "$PWD" \
  --argstr deps "$(cat .nixit.deps | xargs)"

And also you can have a ghci session with:

  nix-shell -p "pkgs.haskellPackages.ghcWithPackages (p: with p; [ $(cat .nixit.deps | xargs) ])" \
    --command "ghci Main.hs"

Or if you want to just execute ghcid and watch it recompiling your project:

nix-shell -p "pkgs.haskellPackages.ghcWithPackages (p: with p; [ $(cat .nixit.deps | xargs) ])" \
  -p haskellPackages.ghcid \
  --command "ghcid --command \"ghci Main.hs\""

Or you may want to stick on a release:

NIX_PATH=nixpkgs=https://nixos.org/channels/nixos-19.09/nixexprs.tar.xz \
  nix-shell -p "pkgs.haskellPackages.ghcWithPackages (p: with p; [ $(cat .nixit.deps | xargs) ])" --command "ghci Main.hs"