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Add configurable devShell.packages #513

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9 changes: 8 additions & 1 deletion doc/devshell.md
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,14 @@ order: -8

haskell-flake uses the [`shellFor`][shellFor] function to provide a Haskell development shell. `shellFor` in turn uses the standard [`mkShell`][mkShell] function to create a Nix shell environment. The `mkShellArgs` option can be used to pass custom arguments to `mkShell`.

Development tools are built from `basePackages` by default. Use `devShell.packages` to choose a different Haskell package set for those tools:

```nix
{
haskellProjects.default.devShell.packages = pkgs.haskellPackages;
}
```

```nix
{
haskellProjects.default = {
Expand Down Expand Up @@ -45,4 +53,3 @@ This sort of composition is either impossible or very complex to do with the `mk

[shellFor]: https://nixos.org/manual/nixpkgs/unstable/#haskell-shellFor
[mkShell]: https://nixos.org/manual/nixpkgs/stable/#sec-pkgs-mkShell

14 changes: 12 additions & 2 deletions nix/modules/project/devshell.nix
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Expand Up @@ -16,6 +16,16 @@ let
'';
default = true;
};
packages = mkOption {
type = types.lazyAttrsOf types.raw;
description = ''
Haskell package set used to build development tools.

By default, this is `basePackages`, before project package
overrides are applied.
'';
default = config.basePackages;
};
tools = mkOption {
type = functionTo (types.lazyAttrsOf (types.nullOr types.package));
description = ''
Expand Down Expand Up @@ -105,8 +115,8 @@ in
inherit (config.outputs) finalPackages;

nativeBuildInputs = lib.attrValues (
config.defaults.devShell.tools finalPackages //
config.devShell.tools finalPackages
config.defaults.devShell.tools config.devShell.packages //
config.devShell.tools config.devShell.packages
);
mkShellArgs = config.devShell.mkShellArgs // {
nativeBuildInputs = (config.devShell.mkShellArgs.nativeBuildInputs or [ ]) ++ nativeBuildInputs;
Expand Down