add flake.nix

flake.lock

@@ -0,0 +1,42 @@
+{
+  "nodes": {
+    "nix": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1570712626,
+        "narHash": "sha256-R3yyxSlyz41cLbB6F54etKNkusPNPGHU0WZkSrfJoKU=",
+        "owner": "NixOS",
+        "repo": "nix",
+        "rev": "61e816217bfdfffd39c130c7cd24f07e640098fc",
+        "type": "github"
+      },
+      "original": {
+        "id": "nix",
+        "rev": "61e816217bfdfffd39c130c7cd24f07e640098fc",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1635792138,
+        "narHash": "sha256-D79GqaYrwgyM4wvOPbQeKveAHROnVh97F36iSGZO9uA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b165ce0c4efbb74246714b5c66b6bcdce8cde175",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nix": "nix",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,40 @@
+{
+  description = "A Haskell re-implementation of the Nix expression language";
+
+  inputs = {
+    nixpkgs.url = "nixpkgs";
+    nix = {
+      url = "nix/61e816217bfdfffd39c130c7cd24f07e640098fc";
+      flake = false;
+    };
+  };
+
+  outputs = {
+    nix,
+    nixpkgs,
+    self,
+  } @ inp: let
+
+    l = builtins //nixpkgs.lib;
+    supportedSystems = ["x86_64-linux"];
+
+    forAllSystems = f: l.genAttrs supportedSystems
+      (system: f system (nixpkgs.legacyPackages.${system}));
+
+  in {
+
+    defaultPackage = forAllSystems
+      (system: pkgs: import ./default.nix {
+        inherit pkgs;
+        withHoogle = true;
+        compiler = "ghc8107";
+        packageRoot = pkgs.runCommand "hnix-src" {} ''
+          cp -r ${./.} $out
+          chmod -R +w $out
+          cp -r ${nix} $out/data/nix
+        '';
+      });
+
+    devShell = forAllSystems (system: pkgs: self.defaultPackage.${system}.env);
+  };
+}