trivionomicon/modules/nix-registry: initial commit

modules/nix-registry/default.nix

@@ -0,0 +1,16 @@
+{
+  config,
+  lib,
+  pkgs,
+  doctrine,
+  flakes,
+  ...
+}:
+doctrine.lib.mkModule {
+  inherit config;
+  name = "nix-registry";
+  hm = ./hm.nix;
+  options = ./options.nix;
+
+  passthru = {inherit flakes;};
+}

modules/nix-registry/hm.nix

@@ -0,0 +1,23 @@
+{
+  pkgs,
+  lib,
+  cfg,
+  flakes,
+  ...
+}: let
+  registryName = name:
+    if name == "self"
+    then cfg.renameSelf
+    else name;
+
+  registryFilter = {
+    nixpkgs = true;
+    unstable = true;
+    self = cfg.renameSelf != null;
+  };
+in {
+  nix.registry =
+    lib.mapAttrs'
+    (name: value: lib.nameValuePair (registryName name) {flake = value;})
+    (lib.filterAttrs (name: _: registryFilter.${name} or cfg.allInputs) flakes);
+}

modules/nix-registry/options.nix

@@ -0,0 +1,19 @@
+{lib, ...}:
+with lib.types; {
+  hm = {
+    allInputs = mkOption {
+      type = bool;
+      default = default;
+      description = ''
+        Include all flake inputs. If false, only 'nixpkgs' and 'unstable'
+        (if available) will be added to the flake registry by default.
+      '';
+    };
+
+    renameSelf = mkOption {
+      type = nullOr str;
+      default = "self";
+      description = "Registry name to use for the 'self' input";
+    };
+  };
+}