flakeify

flake.nix

@@ -0,0 +1,56 @@
+{
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "github:NixOS/nixpkgs/release-21.05";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let pkgs = nixpkgs.legacyPackages.${system};
+      in rec {
+        # `nix build`
+        packages.bad-datalog = pkgs.stdenv.mkDerivation {
+          name = "bad-datalog";
+          src = ./.;
+
+          buildInputs = [ pkgs.elmPackages.elm pkgs.elmPackages.elm-test ];
+
+          buildPhase = pkgs.elmPackages.fetchElmDeps {
+            elmPackages = import ./nix/elm-srcs.nix;
+            elmVersion = "0.19.1";
+            registryDat = ./nix/registry.dat;
+          };
+
+          doCheck = true;
+          checkPhase = "elm-test";
+
+          # it's a little weird that elm2nix says it's fine to build in the install
+          # phase, but who am I to judge?
+          installPhase = ''
+            mkdir -p $out/share/bad-datalog
+
+            (
+              cd sample-apps
+              elm make src/Main.elm --output $out/share/bad-datalog/index.html
+            )
+          '';
+        };
+        defaultPackage = packages.bad-datalog;
+        overlay = final: prev: { bad-datalog = packages.bad-datalog; };
+
+        # `nix develop`
+        devShell = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            git
+
+            elm2nix
+            elmPackages.elm
+            elmPackages.elm-format
+            elmPackages.elm-json
+            elmPackages.elm-live
+            elmPackages.elm-review
+            elmPackages.elm-test
+          ];
+        };
+      });
+}

shell.nix

@@ -1,19 +1,3 @@
-{ ... }:
-let
-  sources = import ./nix/sources.nix { };
-  pkgs = import sources.nixpkgs { };
-  niv = import sources.niv { };
-in pkgs.mkShell {
-  buildInputs = [
-    niv.niv
-    pkgs.git
-
-    pkgs.elm2nix
-    pkgs.elmPackages.elm
-    pkgs.elmPackages.elm-format
-    pkgs.elmPackages.elm-json
-    pkgs.elmPackages.elm-live
-    pkgs.elmPackages.elm-review
-    pkgs.elmPackages.elm-test
-  ];
-}
+(import (fetchTarball https://github.com/edolstra/flake-compat/archive/master.tar.gz) {
+  src = builtins.fetchGit ./.;
+}).shellNix