Hi,
thanks for your help, Thomas and Philip, but I would have two further
questions.
- What should be exported in /nix/store/<current-ghc-hash>/bin/ghc ? My
ghc wrapper only looks like:
'''
#! /nix/store/...--bash-4.2-p45/bin/bash -e
exec /nix/store/...-ghc-7.6.3/bin/ghc
$(/nix/store/...-ghc-get-packages.sh 7.6.3 "$(dirname $0)")
"${extraFlagsArray[@]}"
"$@"
'''
- '/nix/store/...ghc-<version>-wrapper/lib/ghc-<version>/package.conf.d'
seems to contain only configurations for a few standard modules. Should
all packages which are installed on my system show up in there?
Again, many thanks!
Thomas
On 06/18/2014 02:45 PM, Philip Carlsen wrote:
> IIRC, issuing:
>
> $(grep export /nix/store/<your-current-ghc-hash>/bin/ghc)
>
> (or maybe ~/.nix-profile/bin/ghc will work as well if you have your
> haskell tools in your home profile)
>
> in your working shell sets NIX-specific environment variables that the
> ghc api uses to locate the package database by sourcing the wrapper
> code around ghc. Actually, hdevtools should probably just be wrapped
> similarly itself, though I think there might be some problems with
> that (not that I remember right now).
>
> I'm using hdevtools myself, and if this is insufficient to get it
> working I might be forgetting some part of my setup.
>
> Now, for haskell development in general I can recommend making shell
> environments per haskell project you develop using the myEnvFun (see
> https://nixos.org/wiki/Howto_develop_software_on_nixos)
> I have a file with something along the lines of:
>
> A general dev-env.nix:
> -----------------
>
> # This nix environment contains all the tools used in the process of
> developing
> # Because each package has its own dependencies, this file provides a
> function
> # for creating environments, rather than a concrete environment.
> # envName :: String -- The suffix of the name of the resulting
> environment.
> # hsEnvDeps :: HsPkgs -> [CabalNix] -- the dependencies of the package
> being
> # developed in this environment.
> { envName, hsEnvDeps } :
> let
> pkgs = import <nixpkgs> {};
> hsEnv = pkgs.haskellPackages.ghcWithPackagesOld (hsPkgs : ([
> hsPkgs.hlint
> hsPkgs.hdevtools
> hsPkgs.hasktags
> ] ++ (hsEnvDeps hsPkgs)));
> in
> pkgs.myEnvFun {
> name = envName;
> buildInputs = with pkgs; [
> binutils
> coreutils
> ctags
> vimHugeX
> zsh
> hsEnv
> ];
> shell = "${pkgs.zsh.outPath}/bin/zsh";
> extraCmds = ''
> $(grep export ${hsEnv.outPath}/bin/ghc)
> '';
> }
>
> ...And a project-env.nix file for each project:
> -----------------------------------------------------------
> let
> envFun = import ./dev-env.nix;
> projectCabal = import ./cabal.nix;
> in
> envFun {
> envName = "myproject";
> hsEnvDeps = hsPkgs :
> (let
> deriv = hsPkgs.callPackage projectCabal (rec {
> # satisfy dependencies not in hsPkgs by adding them here.
> });
> in deriv.nativeBuildInputs ++ deriv.propagatedNativeBuildInputs);
> }
>
> And 'cabal.nix' being the file output by the cabal2nix tool applied to
> your cabal file.
>
> Then just issuing
>
> $ nix-build project-env.nix
> $ ./result/bin/load-env-myproject
>
> gives you a completely selfcontained, replicatable development
> environment where everything is wired to the same package database.
> (Except for the vim plugins for hdevtools, syntastic etc, which I have
> yet to figure out how to include in my nix expression. So for the time
> being these should be installed separately in ~/.vim)
>
>
> 2014-06-18 11:11 GMT+02:00 Thomas Strobel <ts...@cam.ac.uk
> <mailto:ts...@cam.ac.uk>>:
>
> Hi!
>
> I've got a question for those using Haskell under NixOS. I'm trying to
> use hdevtools to check my Haskell source file, but hdevtools does not
> find any modules. ghc-pkg does, as does ghc-mod. From what I have read
> it might be necessary to set some environment variables.
> Can someone maybe give me an example of how to use hdevtools under
> NixOS?
>
> Many thanks in advance,
> Thomas
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>
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