[WIP] Add nix shell.

.gitignore

@@ -1,3 +1,4 @@
 _build
 *.install
-*.merlin
+*.merlin
+/result

pin.nix

@@ -0,0 +1,11 @@
+let
+  # 2021-08-15
+  nix-rev = "3ab8ce12c2db31268f579c11727d9c63cfee2eee";
+  nix-src = builtins.fetchTarball {
+    url = "https://github.com/NixOS/nixpkgs/archive/${nix-rev}.tar.gz";
+    sha256 = "13fx0yb95gxyk0jyvgrxv2yp4fj54g7nzrlvjfc8slx9ccqd2v86";
+  };
+in import nix-src {
+  overlays =
+    [ (_: super: { ocamlPackages = super.ocaml-ng.ocamlPackages_4_08; }) ];
+}

shell.nix

@@ -0,0 +1,111 @@
+let
+  pkgs = import ./pin.nix;
+  ocaml-xkbcommon = pkgs.ocamlPackages.buildDunePackage {
+    pname = "xkbcommon";
+    version = "0.1";
+    useDune2 = true;
+    src = pkgs.fetchFromGitHub {
+      owner = "Armael";
+      repo = "ocaml-xkbcommon";
+      rev = "af0cd8c938938db3e67b65ac13b6444102756ba0";
+      sha256 = "0zh80aczdn821xkwjn8m74mjcqb6f1hj0qfh1kxrz2z9h5as2r8k";
+    };
+    buildInputs = [
+      pkgs.libxkbcommon
+      pkgs.ocamlPackages.dune-configurator
+      pkgs.libxkbcommon
+    ];
+    propagatedBuildInputs = [
+      pkgs.ocamlPackages.ctypes
+      pkgs.ocamlPackages.base
+      pkgs.ocamlPackages.stdio
+    ];
+    meta = {
+      homepage = "https://github.com/Armael/ocaml-xkbcommon";
+      synopsis = "OCaml bindings to xkbcommon";
+      description = "This package provides OCaml bindings to xkbcommon";
+      maintainers = [ ];
+    };
+  };
+  ocaml-unix-errno = pkgs.ocamlPackages.buildOcaml rec {
+    name = "unix-errno";
+    version = "0.5.2";
+    src = pkgs.fetchFromGitHub {
+      owner = "dsheets";
+      repo = "ocaml-unix-errno";
+      rev = version;
+      sha256 = "1k1pcr9v7hb8jqbbhz1k8c0rs5lzmbgkslb3gv4b53r6sajxrpbf";
+    };
+    nativeBuildInputs = [ pkgs.ocamlPackages.alcotest ];
+    propagatedBuildInputs = [
+      pkgs.ocamlPackages.ctypes
+      pkgs.ocamlPackages.ocaml
+      pkgs.ocamlPackages.result
+    ];
+    meta = {
+      homepage = "https://github.com/dsheets/ocaml-unix-time";
+      synopsis = "Unix time.h types, maps, and support";
+      description = ''
+        unix-time provides access to the features exposed in time.h in a way
+        that is not tied to the implementation on the host system.
+        The Time module provides types which are analogous to those defined in
+        time.h such as timespec.
+        The Time_unix module provides a ctypes view for timespec.
+      '';
+      maintainers = [ ];
+    };
+  };
+  ocaml-unix-time = pkgs.ocamlPackages.buildOcaml rec {
+    name = "unix-time";
+    version = "0.1.0";
+    src = pkgs.fetchFromGitHub {
+      owner = "dsheets";
+      repo = "ocaml-unix-time";
+      rev = version;
+      sha256 = "1ib5khdjdx4zk2hgr9dcxwbfpc6wl31mw760gd4dvmjvgdzrrv94";
+    };
+    doCheck = true;
+    nativeBuildInputs =
+      [ pkgs.ocamlPackages.alcotest pkgs.ocamlPackages.ctypes ];
+    propagatedBuildInputs = [ pkgs.ocamlPackages.ocaml ocaml-unix-errno ];
+    meta = {
+      homepage = "https://github.com/dsheets/ocaml-unix-time";
+      synopsis = "Unix time.h types, maps, and support";
+      description = ''
+        unix-time provides access to the features exposed in time.h in a way
+        that is not tied to the implementation on the host system.
+        The Time module provides types which are analogous to those defined in
+        time.h such as timespec.
+        The Time_unix module provides a ctypes view for timespec.
+      '';
+      maintainers = [ ];
+    };
+  };
+
+in pkgs.mkShell {
+  name = "wlroots-ocaml-shell";
+  propagatedBuildInputs = [
+    pkgs.ocamlPackages.ctypes
+    pkgs.ocamlPackages.dune-configurator
+    pkgs.ocamlPackages.mtime
+    ocaml-unix-time
+    # ocaml-xkbcommon
+  ];
+  nativeBuildInputs = [
+    pkgs.dune_2
+    pkgs.ocamlPackages.findlib
+    # Should be put upstream as an input for wlroots
+    pkgs.libudev
+    pkgs.m4
+    pkgs.ocaml
+    pkgs.pixman
+    pkgs.pkg-config
+    pkgs.less
+    pkgs.wayland
+    pkgs.wayland-protocols
+    pkgs.wlroots
+  ];
+  shellHook = ''
+    export NIX_PATH=nixpkgs=${pkgs.path}
+  '';
+}