Add a flake.nix file

.packcheck.ignore

@@ -2,3 +2,7 @@
 .github/workflows/packcheck.yml
 .gitignore
 cabal.project.Werror
+flake.lock
+flake.nix
+packages.nix
+sources.nix

flake.nix

@@ -0,0 +1,33 @@
+{
+  description = "streamly-text";
+
+  inputs = {
+    #composewell-haskell.url = "git+ssh://[email protected]/composewell/streamly-packages?rev=0479fcff715c7b92f0a917b4cffd25371716b4f4";
+    composewell-haskell.url = "git+ssh://[email protected]/composewell/streamly-packages?ref=master";
+    nixpkgs.follows = "composewell-haskell/nixpkgs";
+    nixpkgs-darwin.follows = "composewell-haskell/nixpkgs-darwin";
+  };
+
+  outputs = { self, nixpkgs, nixpkgs-darwin, composewell-haskell }:
+    let
+      nixpack = composewell-haskell.nixpack;
+      src1 = import "${composewell-haskell}/sources.nix" { inherit nixpack; };
+      src2 = import ./sources.nix {inherit nixpack;};
+    in nixpack.flakeOutputs {
+      inherit nixpkgs;
+      inherit nixpkgs-darwin;
+      inherit nixpack;
+      nixpkgsOptions = {
+            config.allowUnfree = true;
+            config.allowBroken = true;
+          };
+      envOptions = {
+            name = "streamly-text-env";
+            sources = nixpack.lib.mergeSources src1 src2;
+            packages = import ./packages.nix;
+            compiler = "default";
+            hoogle = false;
+            isDev = true;
+      };
+    };
+}

packages.nix

@@ -0,0 +1,14 @@
+{ nixpkgs }:
+{
+dev-packages =
+with nixpkgs.haskellPackages;
+[ streamly-text
+];
+libraries =
+with nixpkgs.haskellPackages;
+[ 
+ temporary
+ quickcheck-instances
+ hspec
+];
+}

sources.nix

@@ -0,0 +1,9 @@
+{nixpack}:
+with nixpack.sources;
+{
+layers = [
+{
+  streamly-text = local ./.;
+}
+];
+}