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Add support for .env shells to flake.nix #3322

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Nov 9, 2022
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13 changes: 13 additions & 0 deletions flake.lock

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15 changes: 14 additions & 1 deletion flake.nix
Original file line number Diff line number Diff line change
Expand Up @@ -362,6 +362,10 @@

src = null;
};

mkEnvShell = hpkgs:
pkgs.lib.mapAttrs (name: value: hpkgs.${name}.env) pkgs.hlsSources;

# Create a hls executable
# Copied from https://github.com/NixOS/nixpkgs/blob/210784b7c8f3d926b7db73bdad085f4dc5d79428/pkgs/development/tools/haskell/haskell-language-server/withWrapper.nix#L16
mkExe = hpkgs:
Expand Down Expand Up @@ -394,14 +398,23 @@
haskell-language-server-942-dev-nix = mkDevShellWithNixDeps ghc942 "cabal.project";
};

# The default shell provided by Nixpkgs for a Haskell package (i.e. the
# one that comes in the `.env` attribute)
envShells = {
haskell-language-server-dev-env = mkEnvShell ghcDefault;
haskell-language-server-902-dev-env = mkEnvShell ghc902;
haskell-language-server-924-dev-env = mkEnvShell ghc924;
haskell-language-server-942-dev-env = mkEnvShell ghc942;
};

allPackages = {
haskell-language-server = mkExe ghcDefault;
haskell-language-server-902 = mkExe ghc902;
haskell-language-server-924 = mkExe ghc924;
haskell-language-server-942 = mkExe ghc942;
};

devShells = simpleDevShells // nixDevShells // {
devShells = simpleDevShells // nixDevShells // envShells // {
default = simpleDevShells.haskell-language-server-dev;
};

Expand Down