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shell.nix
43 строки
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John MacFarlane
New, simpler shell.nix.
11 май 2025, 20:20
11 май 2025, 20:20
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# based on https://gist.github.com/TikhonJelvis/be42400fc31bac0cd1736740fe5eb83b { nixpkgs ? import <nixpkgs> {}, compiler ? "default" }: let inherit (nixpkgs) pkgs; # Build a default.nix file from our .cabal file: here = ./.; project = pkgs.stdenv.mkDerivation ({ name = "default.nix"; buildCommand = '' ${pkgs.cabal2nix}/bin/cabal2nix file://${here} > $out ''; }); # Use the package set for our compiler: haskellPackages = if compiler == "default" then pkgs.haskellPackages else pkgs.haskell.packages.${compiler}; # Helper function that gets Nix-packaged dependencies off GitHub. # GitHub project needs a default.nix file for this to work. fetchHaskell = { url, rev, sha256 }: haskellPackages.callPackage (pkgs.fetchgit { inherit url rev sha256; }) {}; # Note: fetchHaskell shouldn't download the package if you already # have it in the system. base = haskellPackages.callPackage project { ## Specify GitHub dependencies here. ## You can get url, rev and sha256 by running 'nix-prefetch-git git@...' # extraPackage = fetchHaskell { # url = "git@..."; # rev = "<commit hash>"; # sha256 = "<sha256 hash>"; # }; }; in if pkgs.lib.inNixShell then base.env else base