Initial commit

flake.nix

@@ -0,0 +1,57 @@
+{
+  inputs = {
+    opam-nix.url = "github:tweag/opam-nix";
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.follows = "opam-nix/nixpkgs";
+  };
+  outputs = { self, flake-utils, opam-nix, nixpkgs }@inputs:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+        on = opam-nix.lib.${system};
+        localPackagesQuery = builtins.mapAttrs (_: pkgs.lib.last)
+          (on.listRepo (on.makeOpamRepo ./.));
+        devPackagesQuery = {
+          # You can add "development" packages here. They will get added to the devShell automatically.
+          ocaml-lsp-server = "*";
+          ocamlformat = "*";
+          utop = "*";
+          dune-release = "*";
+        };
+        query = devPackagesQuery // {
+          ## You can force versions of certain packages here, e.g:
+          ## - force the ocaml compiler to be taken from opam-repository:
+          ocaml-base-compiler = "*";
+          ## - or force the compiler to be taken from nixpkgs and be a certain version:
+          # ocaml-system = "4.14.0";
+          ## - or force ocamlfind to be a certain version:
+          # ocamlfind = "1.9.2";
+        };
+        scope = on.buildDuneProject { } "tanenbaum"  ./. query;
+        overlay = final: prev:
+          {
+            # You can add overrides here
+          };
+        scope' = scope.overrideScope' overlay;
+        # Packages from devPackagesQuery
+        devPackages = builtins.attrValues
+          (pkgs.lib.getAttrs (builtins.attrNames devPackagesQuery) scope');
+        # Packages in this workspace
+        packages =
+          pkgs.lib.getAttrs (builtins.attrNames localPackagesQuery) scope';
+      in {
+        legacyPackages = scope';
+
+        inherit packages;
+
+        ## If you want to have a "default" package which will be built with just `nix build`, do this instead of `inherit packages;`:
+        # packages = packages // { default = packages.<your default package>; };
+
+        devShells.default = pkgs.mkShell {
+          inputsFrom = builtins.attrValues packages;
+          buildInputs = devPackages ++ [
+            # You can add packages from nixpkgs here
+          ];
+        };
+      });
+}