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flake.nix:

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* Avoid mangling unused parts of pkgs.haskell in `fromHOL`.
  * Create 'defComp', specifying the default compiler, customisable
    through ./comp.nix.
  * Include `modernise` module as a workaround for NIX_GHC -> XMONAD_GHC.
.gitignore:
  * Include nix 'result' symlink.
This commit is contained in:
L. S. Leary 2022-08-25 19:37:06 +12:00
parent b771abeadc
commit df6b40c980
2 changed files with 34 additions and 6 deletions
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3
.gitignore vendored
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@ -27,3 +27,6 @@ tags
/cabal.sandbox.config
/dist-newstyle/
/dist/
# nix artifacts
result

37
flake.nix
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@ -15,17 +15,26 @@
else [ "haskell" "packages" compiler ]
);
fromHOL = hol: comp: final: prev: with prev.lib; with attrsets;
setAttrByPath (hpath comp)
((getAttrFromPath (hpath comp) prev).override (old: {
let
path = hpath comp;
root = head path;
branch = tail path;
hpkgs' = (getAttrFromPath path prev).override (old: {
overrides = composeExtensions (old.overrides or (_: _: {}))
(hol final prev);
}));
});
in {
${root} = recursiveUpdate prev.${root} (setAttrByPath branch hpkgs');
};
hoverlay = final: prev: hself: hsuper:
with prev.haskell.lib.compose; {
xmonad = hself.callCabal2nix "xmonad"
(git-ignore-nix.lib.gitignoreSource ./.) { };
};
overlay = fromHOL hoverlay { };
defComp = if builtins.pathExists ./comp.nix
then import ./comp.nix
else { };
overlay = fromHOL hoverlay defComp;
overlays = [ overlay ];
nixosModule = { config, pkgs, lib, ... }: with lib; with attrsets;
let
@ -64,12 +73,28 @@
nixosModules = [ nixosModule ];
in flake-utils.lib.eachDefaultSystem (system:
let pkgs = import nixpkgs { inherit system overlays; };
hpkg = pkgs.lib.attrsets.getAttrFromPath (hpath defComp) pkgs;
in
rec {
devShell = pkgs.haskellPackages.shellFor {
devShell = hpkg.shellFor {
packages = p: [ p.xmonad ];
};
defaultPackage = pkgs.haskellPackages.xmonad;
defaultPackage = hpkg.xmonad;
# An auxiliary NixOS module that modernises the standard xmonad NixOS module
# and wrapper script used, replacing them with versions from unstable.
# Currently, due to the NIX_GHC --> XMONAD_GHC env var change, this is
# necessary in order for Mod-q recompilation to work out-of-the-box.
modernise =
let
xmonadModFile = "services/x11/window-managers/xmonad.nix";
unpkgs = import unstable { inherit system; };
replaceWrapper = _: _:
{ xmonad-with-packages = unpkgs.xmonad-with-packages; };
in {
disabledModules = [ xmonadModFile ];
imports = [ (unstable + "/nixos/modules/" + xmonadModFile) ];
nixpkgs.overlays = [ replaceWrapper ];
};
}) // {
inherit hoverlay overlay overlays nixosModule nixosModules;
lib = { inherit hpath fromHOL; };