add doctrine

doctrine/default.nix

@@ -0,0 +1,12 @@
+{
+  pkgs,
+  namespace,
+}: let
+  doctrine = {
+    lib = import ./lib {inherit lib pkgs doctrine;};
+    prefix = "trivium";
+    inherit namespace;
+  };
+  inherit (pkgs) lib;
+in
+  doctrine

doctrine/lib/default.nix

@@ -0,0 +1,10 @@
+{
+  lib,
+  doctrine,
+  pkgs,
+}: let
+  close = f: args: f (args // {inherit lib pkgs doctrine;});
+in {
+  importAll = pkgs.callPackage ./importAll.nix {};
+  mkModule = close (import ./mk-module.nix);
+}

doctrine/lib/importAll.nix

@@ -0,0 +1,20 @@
+{lib}: {
+  root,
+  exclude ? [],
+}:
+with builtins;
+with lib;
+# http://chriswarbo.net/projects/nixos/useful_hacks.html
+  let
+    basename = removeSuffix ".nix";
+
+    isMatch = name: type:
+      (hasSuffix ".nix" name || type == "directory")
+      && ! elem name (map basename exclude);
+
+    entry = name: _: {
+      name = basename name;
+      value = import (root + "/${name}");
+    };
+  in
+    mapAttrs' entry (filterAttrs isMatch (readDir root))

doctrine/lib/mk-module.nix

@@ -0,0 +1,38 @@
+{
+  name,
+  hm ? null,
+  sys ? null,
+  options ? null,
+  lib,
+  config,
+  pkgs,
+  doctrine,
+}: let
+  optionsSet = import options {
+    inherit config lib pkgs cfg name doctrine;
+  };
+
+  configSet = import configFiles.${doctrine.namespace} {
+    inherit config lib pkgs doctrine cfg;
+  };
+
+  configFiles = lib.filterAttrs (k: v: v != null) {
+    inherit sys hm;
+  };
+
+  cfg = config.${doctrine.prefix}.${name};
+in {
+  config =
+    lib.optionalAttrs (configFiles ? ${doctrine.namespace})
+    (lib.mkIf cfg.enable configSet);
+
+  options = lib.optionalAttrs (options
+    != null
+    && optionsSet ? ${doctrine.namespace}) {
+    ${doctrine.prefix}.${name} =
+      optionsSet.${doctrine.namespace}
+      // {
+        enable = lib.mkEnableOption name;
+      };
+  };
+}