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|
{ config, lib, pkgs, ... }:
with lib;
with builtins;
let
cfg = config.haskell;
spacemacsPackages = haskellPackages:
with haskellPackages; [
apply-refact
hlint
stylish-haskell
hasktags
];
haskellBuildInput = (if cfg.hoogle.enable then
cfg.haskellPackages.ghcWithHoogle
else
cfg.haskellPackages.ghcWithPackages) (haskellPackages:
(cfg.packages haskellPackages)
++ optionals cfg.spacemacs.enable (spacemacsPackages haskellPackages)
++ optional cfg.cabal.enable pkgs.cabal-install);
in {
options.haskell = {
enable = mkEnableOption { name = "haskell"; };
haskellPackages = mkOption {
type = with types;
addCheck (lazyAttrsOf anything)
(packages: lib.hasAttr "ghcWithPackages" packages);
default = pkgs.haskellPackages;
defaultText = literalExample "pkgs.haskellPackages";
description = ''
The set of Haskell packages from which to get GHC and its packages.
Use this option to set the version of GHC.
'';
example = literalExample "pkgs.haskell.packages.ghcjs";
};
packages = mkOption {
type = with types; functionTo (listOf package);
default = _: [ ];
defaultText = literalExample "_ : []";
description = ''
Haskell packages that will be made available to the environment.
'';
example = literalExample ''
haskellPackages: with haskellPackages; [ async cabal-install ];
'';
};
# Whether to load packages required by Spacemacs layer.
spacemacs.enable = mkEnableOption "spacemacs";
hoogle.enable = mkEnableOption "hoogle";
cabal = {
enable = mkEnableOption "cabal";
package = mkOption {
type = types.package;
default = pkgs.cabal-install;
defaultText = defaultText "pkgs.cabal-install";
description = "The package for cabal.";
};
# TODO: add ability to set path to binaries
# TODO: explain that here cabal is not loaded with ghc, but as an external package
};
};
config = mkIf cfg.enable {
buildInputs = [ haskellBuildInput ];
envVars.PATH.value = mkIf cfg.cabal.enable "~/.cabal/bin"; # only on linux
};
}
|
