refactor: more elegant shorthand support

lib/src/modules/default.nix

@@ -358,7 +358,7 @@ lib: {
               in
                 if builtins.isAttrs subtree
                 then builtins.mapAttrs (name: f module) subtree
-                else builtins.throw "Value for `${builtins.concatStringsSep "." prefix} is of type `${builtins.typeOf subtree}` but an attribute set was expected."
+                else builtins.throw "Value for `${builtins.concatStringsSep "." prefix}` is of type `${builtins.typeOf subtree}` but an attribute set was expected."
             )
             modules);
 

lib/src/modules/default.test.nix

@@ -493,5 +493,113 @@ in {
       };
     in
       evaluated.config.aux.message == evaluated.config.aux.message2;
+
+    "function submodules" = let
+      expected = "Hello, World!";
+      evaluated = lib.modules.run {
+        modules = [
+          {
+            options = {
+              aux = lib.options.create {
+                type = lib.types.submodules.of {
+                  shorthand = false;
+                  modules = [
+                    {
+                      options.message = lib.options.create {
+                        type = lib.types.string;
+                      };
+                    }
+                  ];
+                };
+              };
+            };
+            config = {
+              aux = args: {
+                config.message = expected;
+              };
+            };
+          }
+        ];
+      };
+    in
+      evaluated.config.aux.message == expected;
+
+    "merges submodules" = let
+      expected = "Hello, World!";
+      evaluated = lib.modules.run {
+        modules = [
+          {
+            options = {
+              aux = lib.options.create {
+                type = lib.types.submodules.of {
+                  shorthand = false;
+                  modules = [
+                    {
+                      options.message = lib.options.create {
+                        type = lib.types.string;
+                      };
+                    }
+                  ];
+                };
+              };
+            };
+            config = {
+              aux = args: {
+                options.message2 = lib.options.create {
+                  type = lib.types.string;
+                };
+
+                config.message = expected;
+              };
+            };
+          }
+          {
+            config = {
+              aux.config.message2 = expected;
+            };
+          }
+        ];
+      };
+    in
+      evaluated.config.aux.message == evaluated.config.aux.message2;
+
+    "flexible shorthand" = let
+      expected = "Hello, World!";
+      evaluated = lib.modules.run {
+        modules = [
+          {
+            options = {
+              aux = lib.options.create {
+                type = lib.types.submodules.of {
+                  shorthand = true;
+                  modules = [
+                    {
+                      options.message = lib.options.create {
+                        type = lib.types.string;
+                      };
+                    }
+                  ];
+                };
+              };
+            };
+            config = {
+              aux = args: {
+                options.message2 = lib.options.create {
+                  type = lib.types.string;
+                };
+
+                config.message = expected;
+              };
+            };
+          }
+          {
+            config = {
+              aux.message2 = expected;
+            };
+          }
+        ];
+      };
+    in
+      evaluated.config.aux.message == evaluated.config.aux.message2;
   };
 }

lib/src/types/default.nix

@@ -756,7 +756,7 @@ lib: {
       ## with helpers like `lib.types.attrs.of` in order to produce more complex,
       ## dynamic types.
       ##
-      ## @type { modules :: List Module, args? :: Attrs, description? :: String | Null } -> Attrs
+      ## @type { modules :: List Module, args? :: Attrs, description? :: String | Null, shorthand? :: Bool } -> Attrs
       of = settings @ {
         modules,
         args ? {},
@@ -765,10 +765,23 @@ lib: {
       }: let
         getModules = builtins.map (
           definition:
-            if shorthand && builtins.isAttrs definition
+            if shorthand && builtins.isAttrs definition.value
-            then {
+            then let
+              config =
+                definition.value.config
+                or (
+                  builtins.removeAttrs definition.value
+                  (builtins.filter (key: key != "config") lib.modules.VALID_KEYS)
+                );
+              rest =
+                if definition.value ? config
+                then builtins.removeAttrs definition.value ["config"]
+                else lib.attrs.filter (name: value: builtins.elem name lib.modules.VALID_KEYS) definition.value;
+            in
+              rest
+              // {
                 __file__ = definition.__file__;
-              config = definition.value;
+                config = config;
               }
             else {
               __file__ = definition.__file__;

tidepool/flake.lock

@@ -8,10 +8,10 @@
       },
       "locked": {
         "dir": "foundation",
-        "dirtyRev": "b3f9fe574e6ff545e4a6fe6ad5e90fc71baeece3-dirty",
+        "dirtyRev": "aa1c58f6ee8a3ad6ad569f34477192462533c16b-dirty",
-        "dirtyShortRev": "b3f9fe5-dirty",
+        "dirtyShortRev": "aa1c58f-dirty",
-        "lastModified": 1718366115,
+        "lastModified": 1718411218,
-        "narHash": "sha256-/ktNtlY/usvE1YaathJ0f6y60cv3gQjc32SMKApsp7Y=",
+        "narHash": "sha256-LOzQGGygC2U08zNwg1YNljjrJKJxnJ8S4RkX2v81yRw=",
         "type": "git",
         "url": "file:../?dir=foundation"
       },
@@ -24,10 +24,10 @@
     "lib": {
       "locked": {
         "dir": "lib",
-        "dirtyRev": "b3f9fe574e6ff545e4a6fe6ad5e90fc71baeece3-dirty",
+        "dirtyRev": "aa1c58f6ee8a3ad6ad569f34477192462533c16b-dirty",
-        "dirtyShortRev": "b3f9fe5-dirty",
+        "dirtyShortRev": "aa1c58f-dirty",
-        "lastModified": 1718366115,
+        "lastModified": 1718411218,
-        "narHash": "sha256-/ktNtlY/usvE1YaathJ0f6y60cv3gQjc32SMKApsp7Y=",
+        "narHash": "sha256-LOzQGGygC2U08zNwg1YNljjrJKJxnJ8S4RkX2v81yRw=",
         "type": "git",
         "url": "file:../?dir=lib"
       },

tidepool/src/builders/basic.nix

@@ -26,11 +26,9 @@ in {
           sorted.result;
 
         system = package.platform.build;
-
-        deps = lib'.packages.dependencies.resolve package.deps system;
       in
-        (builtins.trace script)
+        builtins.derivation (
-        builtins.derivation (package.env
+          package.env
           // {
             inherit (package) name;
             inherit script system;
@@ -40,7 +38,7 @@ in {
             SHELL = cfg.executable;
 
             PATH = lib.paths.bin (
-              (lib'.packages.dependencies.getPackages "build.host" deps)
+              (lib'.packages.dependencies.getPackages package.deps.build.host)
               ++ [
                 foundation.stage2-bash
                 foundation.stage2-coreutils
@@ -67,7 +65,8 @@ in {
                 bash -eux $scriptPath
               '')
             ];
-          });
+          }
+        );
     };
   };
 }

tidepool/src/export.nix

@@ -12,7 +12,7 @@ in {
       modules = import ./modules.nix;
 
       packages = {
-        example = lib'.packages.export "example.x";
+        example-x = config.packages.example.x;
       };
     };
   };

tidepool/src/exports/lib.nix

@@ -1,6 +1,6 @@
 {
-  config,
   lib,
+  config,
 }: let
 in {
   options = {

tidepool/src/exports/packages.nix

@@ -3,12 +3,10 @@
   lib,
 }: let
   lib' = config.lib;
-
-  cfg = config.exports;
 in {
   options = {
     exports.packages = lib.options.create {
-      type = lib.types.attrs.of (lib.types.function (lib.types.nullish lib.types.derivation));
+      type = lib.types.attrs.of (lib'.types.raw);
       default.value = {};
     };
 
@@ -22,17 +20,27 @@ in {
     exported.packages = let
       all = lib.attrs.generate lib'.systems.doubles.all (
         system: let
-          packages =
+          all =
             builtins.mapAttrs
-            (name: resolve: resolve system)
+            (
-            cfg.packages;
+              name: package: let
+                result = lib'.packages.build package system system;
+              in
+                result
+            )
+            config.exports.packages;
 
           available =
             lib.attrs.filter
-            (name: package: package != null)
+            (name: package: builtins.elem system package.meta.platforms)
-            packages;
+            all;
+
+          packages =
+            builtins.mapAttrs
+            (name: package: package.package)
+            available;
         in
-          available
+          packages
       );
 
       available =

tidepool/src/lib/default.nix

@@ -19,4 +19,8 @@ in {
       apply = value: lib.extend (final: prev: prev.attrs.mergeRecursive prev value);
     };
   };
+
+  config = {
+    __module__.args.dynamic.lib' = config.lib;
+  };
 }

tidepool/src/lib/packages.nix

@@ -1,82 +1,65 @@
 {
   lib,
+  lib',
   config,
-}: let
+}: {
-  lib' = config.lib;
-in {
   config = {
     lib.packages = {
       dependencies = {
-        getPackages = path: dependencies: let
+        getPackages = dependencies: let
-          resolved =
+          available =
-            if builtins.isList path
+            builtins.filter
-            then path
+            (dependency: !(builtins.isNull dependency))
-            else lib.strings.split "." path;
+            (builtins.attrValues dependencies);
-
-          attrs = lib.attrs.select resolved {} dependencies;
         in
-          lib.attrs.mapToList (name: value: value.package) attrs;
+          builtins.map (dependency: dependency.package) available;
-
-        resolve = dependencies: system:
-          builtins.mapAttrs
-          # Note that this does not correspond to the "host" and "target" platforms, but rather
-          # where the code is used and where it is intended to end up.
-          (
-            host: platforms:
-              builtins.mapAttrs
-              (
-                target: deps:
-                  builtins.mapAttrs
-                  (
-                    name: dependency:
-                      assert lib.errors.trace (dependency.namespace != null) "Namespace unknown for dependency `${name}`."; let
-                        targeted = lib'.packages.export [dependency.namespace name] system;
-                      in
-                        if targeted == null
-                        then builtins.throw "Dependency `${dependency.namespace}.${name}` does not support system `${system}`."
-                        else targeted
-                  )
-                  deps
-              )
-              platforms
-          )
-          dependencies;
       };
 
-      ## Get a package from the package set by its path. The path can be either
+      getLatest = alias: let
-      ## a string or a list of strings that is used to access `config.packages.generic`.
+        versions = builtins.attrNames alias.versions;
-      ##
+        sorted = builtins.sort (builtins.compareVersions) versions;
-      ## @type String | List String -> Package
-      get = path: let
-        resolved =
-          if builtins.isList path
-          then path
-          else lib.strings.split "." path;
-
-        package = lib.attrs.selectOrThrow resolved config.packages.generic;
       in
-        assert lib.errors.trace (builtins.length resolved > 1) "Cannot get package without a namespace.";
+        builtins.head sorted;
-          package
+
-          // {
+      build = package: system: cross: let
-            namespace = lib.modules.override 99 (builtins.head resolved);
+        resolved =
+          if package ? versions
+          then package.versions.${config.preferences.packages.version} or (lib'.packages.getLatest package)
+          else package;
+
+        buildDependencies = builtins.mapAttrs (name: dep: lib'.packages.build dep system cross);
+
+        result = resolved.extend ({config}: {
+          config = {
+            platform = {
+              build = system;
+              host = cross;
+              target = cross;
             };
 
-      ## Export a package by its path. Use this function with the `config.exports.packages.*`
+            deps = {
-      ## options.
+              build = {
-      ##
+                only = buildDependencies resolved.deps.build.only;
-      ## @type String | List String -> String -> Package
+                build = buildDependencies resolved.deps.build.build;
-      export = path: system: let
+                host = buildDependencies resolved.deps.build.host;
-        resolved =
+                target = buildDependencies resolved.deps.build.target;
-          if builtins.isList path
+              };
-          then path
+              host = {
-          else lib.strings.split "." path;
+                only = buildDependencies resolved.deps.host.only;
+                host = buildDependencies resolved.deps.host.host;
+                target = buildDependencies resolved.deps.host.target;
+              };
+              target = {
+                only = buildDependencies resolved.deps.target.only;
+                target = buildDependencies resolved.deps.target.target;
+              };
+            };
 
-        package = lib'.packages.get resolved;
+            package = config.builder.build config;
-        targeted = lib.attrs.selectOrThrow resolved config.packages.targeted.${system};
+          };
+        });
       in
-        if builtins.elem system package.meta.platforms
+        result.config;
-        then targeted.package
-        else null;
     };
   };
 }

tidepool/src/lib/types.nix

@@ -1,9 +1,8 @@
 {
   lib,
+  lib',
   config,
-}: let
+}: {
-  lib' = config.lib;
-in {
   config = {
     lib.types = {
       license = let
@@ -51,8 +50,72 @@ in {
       in
         lib.types.either type (lib.types.list.of type);
 
-      meta = lib.types.submodule {
+      builder = lib.types.submodule {
+        freeform = lib.types.any;
+
         options = {
+          build = lib.options.create {
+            description = "The build function which takes a package definition and creates a derivation.";
+            type = lib.types.function lib.types.derivation;
+          };
+        };
+      };
+
+      packages = lib.types.attrs.of (lib'.types.alias);
+
+      alias = lib.types.attrs.of (lib.types.submodule {
+        options = {
+          versions = lib.options.create {
+            description = "All available package versions.";
+            type = lib.types.attrs.of lib'.types.package;
+          };
+        };
+      });
+
+      dependencies = lib.types.attrs.of (lib.types.nullish (lib.types.either lib'.types.alias lib'.types.package));
+
+      package = lib.types.submodule ({
+        config,
+        meta,
+      }: {
+        options = {
+          extend = lib.options.create {
+            description = "Extend the package's submodules with additional configuration.";
+            type = lib.types.function lib.types.raw;
+            default.value = value:
+              meta.extend {
+                modules =
+                  if builtins.isAttrs value
+                  then [{config = value;}]
+                  else lib.lists.from.any value;
+              };
+          };
+
+          name = lib.options.create {
+            description = "The name of the package.";
+            type = lib.types.string;
+            default = {
+              text = "\${config.pname}-\${config.version}";
+              value =
+                if config.pname != null && config.version != null
+                then "${config.pname}-${config.version}"
+                else "";
+            };
+          };
+
+          pname = lib.options.create {
+            description = "The program name for the package";
+            type = lib.types.nullish lib.types.string;
+            default.value = null;
+          };
+
+          version = lib.options.create {
+            description = "The version for the package.";
+            type = lib.types.nullish lib.types.version;
+            default.value = null;
+          };
+
+          meta = {
             description = lib.options.create {
               description = "The description for the package.";
               type = lib.types.nullish lib.types.string;
@@ -67,7 +130,7 @@ in {
 
             license = lib.options.create {
               description = "The license for the package.";
-            type = lib.types.nullish config.lib.types.license;
+              type = lib.types.nullish lib'.types.license;
               default.value = null;
             };
 
@@ -101,438 +164,29 @@ in {
               default.value = [];
             };
           };
-      };
-
-      builder = lib.types.submodule {
-        freeform = lib.types.any;
-
-        options = {
-          build = lib.options.create {
-            description = "The build function which takes a package definition and creates a derivation.";
-            type = lib.types.function lib.types.derivation;
-          };
-        };
-      };
-
-      packages = {
-        generic = lib.types.attrs.of (lib.types.submodule ({name}: {
-          freeform = lib.types.attrs.of (lib.types.submodule [
-            lib'.types.package.generic'
-          ]);
-        }));
-
-        versioned = lib.types.attrs.of (lib.types.submodule ({name}: {
-          freeform = lib.types.attrs.of (lib.types.submodule [
-            lib'.types.package.versioned'
-          ]);
-        }));
-
-        # packages.<system>
-        targeted = lib.types.attrs.of (lib.types.submodule ({name}: let
-          system = name;
-        in {
-          # packages.<system>.<namespace>
-          freeform = lib.types.attrs.of (lib.types.submodule ({name}: let
-            namespace = name;
-          in {
-            # packages.<system>.<namespace>.<name>
-            freeform = lib.types.attrs.of (lib.types.submodule [
-              lib'.types.package.targeted'
-              {
-                config = {
-                  namespace = lib.modules.override 99 namespace;
-
-                  platform = {
-                    build = system;
-                    host = lib.modules.overrides.default system;
-                    target = lib.modules.overrides.default system;
-                  };
-                };
-              }
-            ]);
-          }));
-
-          # packages.<system>.<cross>
-          options.cross = lib.attrs.generate lib'.systems.doubles.all (cross:
-            lib.options.create {
-              description = "A cross-compiling package set.";
-              default.value = {};
-              # packages.<system>.<cross>.<namespace>
-              type = lib.types.attrs.of (lib.types.submodule (
-                {name}: let
-                  namespace = name;
-                in {
-                  # packages.<system>.<cross>.<namespace>.<name>
-                  freeform = lib.types.attrs.of (lib.types.submodule [
-                    lib'.types.package.targeted'
-                    {
-                      config = {
-                        namespace = lib.modules.override 99 namespace;
-
-                        platform = {
-                          build = system;
-                          host = cross;
-                          target = lib.modules.overrides.default cross;
-                        };
-                      };
-                    }
-                  ]);
-                }
-              ));
-            });
-        }));
-      };
-
-      dependencies = {
-        generic = lib.types.attrs.of (lib.types.nullish lib'.types.package.generic);
-        targeted = lib.types.attrs.of (lib.types.nullish lib'.types.package.targeted);
-      };
-
-      package = {
-        generic = lib.types.submodule lib'.types.package.generic';
-
-        generic' = args @ {
-          name ? assert false; null,
-          config,
-        }: {
-          freeform = lib.types.any;
-
-          options = {
-            namespace = lib.options.create {
-              description = "The namespace for the package.";
-              type = lib.types.nullish lib.types.string;
-              default.value = null;
-            };
-
-            pname = lib.options.create {
-              description = "The program name for the package";
-              type = lib.types.string;
-              default = {
-                text = "<name> or \"unknown\"";
-                value =
-                  if args ? name
-                  then args.name
-                  else "unknown";
-              };
-            };
-
-            version = lib.options.create {
-              description = "The version for the package.";
-              type = lib.types.nullish lib.types.version;
-              default.value = null;
-            };
-
-            meta = lib.options.create {
-              description = "Metadata for the package.";
-              type = lib'.types.meta;
-              default.value = {
-                name = config.pname;
-              };
-            };
-
-            phases = lib.options.create {
-              description = "The phases for the package.";
-              type = lib.types.dag.of (
-                lib.types.either
-                lib.types.string
-                (lib.types.function lib.types.string)
-              );
-              default.value = {};
-            };
-
-            env = lib.options.create {
-              description = "The environment for the package.";
-              type = lib.types.attrs.of lib.types.string;
-              default.value = {};
-            };
-
-            builder = lib.options.create {
-              description = "The builder for the package.";
-              type = lib'.types.builder;
-            };
-
-            deps = {
-              build = {
-                only = lib.options.create {
-                  description = "Dependencies which are only used in the build environment.";
-                  type = lib'.types.dependencies.generic;
-                  default.value = {};
-                };
-
-                build = lib.options.create {
-                  description = "Dependencies which are created in the build environment and are executed in the build environment.";
-                  type = lib'.types.dependencies.generic;
-                  default.value = {};
-                };
-
-                host = lib.options.create {
-                  description = "Dependencies which are created in the build environment and are executed in the host environment.";
-                  type = lib'.types.dependencies.generic;
-                  default.value = {};
-                };
-
-                target = lib.options.create {
-                  description = "Dependencies which are created in the build environment and are executed in the target environment.";
-                  type = lib'.types.dependencies.generic;
-                  default.value = {};
-                };
-              };
-
-              host = {
-                only = lib.options.create {
-                  description = "Dependencies which are only used in the host environment.";
-                  type = lib'.types.dependencies.generic;
-                  default.value = {};
-                };
-
-                host = lib.options.create {
-                  description = "Dependencies which are executed in the host environment.";
-                  type = lib'.types.dependencies.generic;
-                  default.value = {};
-                };
-
-                target = lib.options.create {
-                  description = "Dependencies which are executed in the host environment which produces code for the target environment.";
-                  type = lib'.types.dependencies.generic;
-                  default.value = {};
-                };
-              };
-
-              target = {
-                only = lib.options.create {
-                  description = "Dependencies which are only used in the target environment.";
-                  type = lib'.types.dependencies.generic;
-                  default.value = {};
-                };
-
-                target = lib.options.create {
-                  description = "Dependencies which are executed in the target environment.";
-                  type = lib'.types.dependencies.generic;
-                  default.value = {};
-                };
-              };
-            };
-
-            versions = lib.options.create {
-              description = "Available package versions.";
-              type = lib.types.attrs.of lib'.types.package.versioned;
-              default.value = {};
-            };
-          };
-        };
-
-        versioned = lib.types.submodule lib'.types.package.versioned';
-
-        versioned' = args @ {
-          name ? assert false; null,
-          config,
-        }: {
-          freeform = lib.types.any;
-
-          options = {
-            namespace = lib.options.create {
-              description = "The namespace for the package.";
-              type = lib.types.nullish lib.types.string;
-              default.value = null;
-            };
-
-            pname = lib.options.create {
-              description = "The program name for the package";
-              type = lib.types.string;
-              default = {
-                text = "<name> or \"unknown\"";
-                value =
-                  if args ? name
-                  then args.name
-                  else "unknown";
-              };
-            };
-
-            version = lib.options.create {
-              description = "The version for the package.";
-              type = lib.types.nullish lib.types.version;
-              default.value = null;
-            };
-
-            meta = lib.options.create {
-              type = lib'.types.meta;
-              default.value = {
-                name = config.pname;
-              };
-            };
-
-            phases = lib.options.create {
-              description = "The phases for the package.";
-              type = lib.types.dag.of (
-                lib.types.either
-                lib.types.string
-                (lib.types.function lib.types.string)
-              );
-              default.value = {};
-            };
-
-            env = lib.options.create {
-              description = "The environment for the package.";
-              type = lib.types.attrs.of lib.types.string;
-              default.value = {};
-            };
-
-            builder = lib.options.create {
-              description = "The builder for the package.";
-              type = lib'.types.builder;
-            };
-
-            deps = {
-              build = {
-                only = lib.options.create {
-                  description = "Dependencies which are only used in the build environment.";
-                  type = lib'.types.dependencies.generic;
-                  default.value = {};
-                };
-
-                build = lib.options.create {
-                  description = "Dependencies which are created in the build environment and are executed in the build environment.";
-                  type = lib'.types.dependencies.generic;
-                  default.value = {};
-                };
-
-                host = lib.options.create {
-                  description = "Dependencies which are created in the build environment and are executed in the host environment.";
-                  type = lib'.types.dependencies.generic;
-                  default.value = {};
-                };
-
-                target = lib.options.create {
-                  description = "Dependencies which are created in the build environment and are executed in the target environment.";
-                  type = lib'.types.dependencies.generic;
-                  default.value = {};
-                };
-              };
-
-              host = {
-                only = lib.options.create {
-                  description = "Dependencies which are only used in the host environment.";
-                  type = lib'.types.dependencies.generic;
-                  default.value = {};
-                };
-
-                host = lib.options.create {
-                  description = "Dependencies which are executed in the host environment.";
-                  type = lib'.types.dependencies.generic;
-                  default.value = {};
-                };
-
-                target = lib.options.create {
-                  description = "Dependencies which are executed in the host environment which produces code for the target environment.";
-                  type = lib'.types.dependencies.generic;
-                  default.value = {};
-                };
-              };
-
-              target = {
-                only = lib.options.create {
-                  description = "Dependencies which are only used in the target environment.";
-                  type = lib'.types.dependencies.generic;
-                  default.value = {};
-                };
-
-                target = lib.options.create {
-                  description = "Dependencies which are executed in the target environment.";
-                  type = lib'.types.dependencies.generic;
-                  default.value = {};
-                };
-              };
-            };
-
-            versions = lib.options.create {
-              description = "Available package versions.";
-              type = lib.types.attrs.of lib'.types.package.versioned;
-              default.value = {};
-            };
-          };
-        };
-
-        targeted = lib.types.submodule lib'.types.package.targeted';
-
-        targeted' = args @ {
-          name ? assert false; null,
-          config,
-        }: {
-          options = {
-            freeform = lib.types.any;
-
-            name = lib.options.create {
-              description = "The name of the package.";
-              type = lib.types.string;
-              default = {
-                text = "\${namespace}-\${pname}-\${version} or \${pname}-\${version}";
-                value = let
-                  namespace =
-                    if config.namespace == null
-                    then ""
-                    else "${config.namespace}-";
-                  version =
-                    if config.version == null
-                    then ""
-                    else "-${config.version}";
-                in "${namespace}${config.pname}${version}";
-              };
-            };
-
-            namespace = lib.options.create {
-              description = "The namespace for the package.";
-              type = lib.types.nullish lib.types.string;
-              default.value = null;
-            };
-
-            pname = lib.options.create {
-              description = "The program name for the package.";
-              type = lib.types.string;
-              default = {
-                text = "<name> or \"unknown\"";
-                value =
-                  if args ? name
-                  then args.name
-                  else "unknown";
-              };
-            };
-
-            version = lib.options.create {
-              description = "The version for the package.";
-              type = lib.types.nullish lib.types.version;
-              default.value = null;
-            };
-
-            meta = lib.options.create {
-              description = "Metadata for the package.";
-              type = lib'.types.meta;
-              default.value = {
-                name = config.pname;
-              };
-            };
 
           platform = {
             build = lib.options.create {
               description = "The build platform for the package.";
-                type = lib.types.nullish lib.types.string;
+              type = lib.types.string;
-                default.value = null;
+              default.value = "unknown";
             };
 
             host = lib.options.create {
               description = "The host platform for the package.";
-                type = lib.types.nullish lib.types.string;
+              type = lib.types.string;
-                default.value = null;
+              default.value = "unknown";
             };
 
             target = lib.options.create {
               description = "The target platform for the package.";
-                type = lib.types.nullish lib.types.string;
+              type = lib.types.string;
-                default.value = null;
+              default.value = "unknown";
             };
           };
 
           phases = lib.options.create {
-              description = "Build phases for the package.";
+            description = "The phases for the package.";
             type = lib.types.dag.of (
               lib.types.either
               lib.types.string
@@ -552,85 +206,75 @@ in {
             type = lib'.types.builder;
           };
 
+          deps = {
+            build = {
+              only = lib.options.create {
+                description = "Dependencies which are only used in the build environment.";
+                type = lib'.types.dependencies;
+                default.value = {};
+              };
+
+              build = lib.options.create {
+                description = "Dependencies which are created in the build environment and are executed in the build environment.";
+                type = lib'.types.dependencies;
+                default.value = {};
+              };
+
+              host = lib.options.create {
+                description = "Dependencies which are created in the build environment and are executed in the host environment.";
+                type = lib'.types.dependencies;
+                default.value = {};
+              };
+
+              target = lib.options.create {
+                description = "Dependencies which are created in the build environment and are executed in the target environment.";
+                type = lib'.types.dependencies;
+                default.value = {};
+              };
+            };
+
+            host = {
+              only = lib.options.create {
+                description = "Dependencies which are only used in the host environment.";
+                type = lib'.types.dependencies;
+                default.value = {};
+              };
+
+              host = lib.options.create {
+                description = "Dependencies which are executed in the host environment.";
+                type = lib'.types.dependencies;
+                default.value = {};
+              };
+
+              target = lib.options.create {
+                description = "Dependencies which are executed in the host environment which produces code for the target environment.";
+                type = lib'.types.dependencies;
+                default.value = {};
+              };
+            };
+
+            target = {
+              only = lib.options.create {
+                description = "Dependencies which are only used in the target environment.";
+                type = lib'.types.dependencies;
+                default.value = {};
+              };
+
+              target = lib.options.create {
+                description = "Dependencies which are executed in the target environment.";
+                type = lib'.types.dependencies;
+                default.value = {};
+              };
+            };
+          };
+
           package = lib.options.create {
             description = "The built derivation.";
             type = lib.types.derivation;
-            };
+            default.value = config.builder.build config;
-
-            deps = {
-              build = {
-                only = lib.options.create {
-                  description = "Dependencies which are only used in the build environment.";
-                  type = lib'.types.dependencies.targeted;
-                  default.value = {};
-                };
-
-                build = lib.options.create {
-                  description = "Dependencies which are created in the build environment and are executed in the build environment.";
-                  type = lib'.types.dependencies.targeted;
-                  default.value = {};
-                };
-
-                host = lib.options.create {
-                  description = "Dependencies which are created in the build environment and are executed in the host environment.";
-                  type = lib'.types.dependencies.targeted;
-                  default.value = {};
-                };
-
-                target = lib.options.create {
-                  description = "Dependencies which are created in the build environment and are executed in the target environment.";
-                  type = lib'.types.dependencies.targeted;
-                  default.value = {};
-                };
-              };
-
-              host = {
-                only = lib.options.create {
-                  description = "Dependencies which are only used in the host environment.";
-                  type = lib'.types.dependencies.targeted;
-                  default.value = {};
-                };
-
-                host = lib.options.create {
-                  description = "Dependencies which are executed in the host environment.";
-                  type = lib'.types.dependencies.targeted;
-                  default.value = {};
-                };
-
-                target = lib.options.create {
-                  description = "Dependencies which are executed in the host environment which produces code for the target environment.";
-                  type = lib'.types.dependencies.targeted;
-                  default.value = {};
-                };
-              };
-
-              target = {
-                only = lib.options.create {
-                  description = "Dependencies which are only used in the target environment.";
-                  type = lib'.types.dependencies.targeted;
-                  default.value = {};
-                };
-
-                target = lib.options.create {
-                  description = "Dependencies which are executed in the target environment.";
-                  type = lib'.types.dependencies.targeted;
-                  default.value = {};
-                };
-              };
-            };
-
-            versions = lib.options.create {
-              description = "Available package versions.";
-              type = lib.types.attrs.of lib'.types.package.versioned;
-              default.value = {};
-            };
-          };
-
-          config = {
-            package = config.builder.build config;
-          };
           };
         };
+      });
     };
   };
 }

tidepool/src/packages/aux/foundation.nix

@@ -1,32 +1,37 @@
 {
   lib,
+  lib',
   config,
   options,
 }: let
-  lib' = config.lib;
+  builders = config.builders;
 in {
   config = {
     packages = {
-      generic = {
       example = {
         x = {
-            meta.platforms = ["i686-linux" "x86_64-linux"];
+          versions = {
+            "latest" = {config}: {
+              config = {
+                meta = {
+                  platforms = ["i686-linux" "x86_64-linux"];
+                };
+
+                pname = "x";
                 version = "1.0.0";
 
-            builder = config.builders.basic;
+                builder = builders.basic;
 
                 phases = {
-              build = package: ''
+                  build = ''
-                make --build ${package.platform.build} --host ${package.platform.host}
+                    make --build ${config.platform.build} --host ${config.platform.host}
                   '';
 
                   install = lib.dag.entry.after ["build"] ''
                     make install DESTDIR=$out
                   '';
                 };
-
+              };
-            versions = {
-              "latest" = config.packages.generic.example.x;
             };
           };
         };

tidepool/src/packages/default.nix

@@ -5,46 +5,23 @@
   lib' = config.lib;
 
   doubles = lib'.systems.doubles.all;
-
-  generic = config.packages.generic;
-
-  getPackages = system:
-    builtins.mapAttrs
-    (
-      namespace: packages:
-        lib.attrs.filter
-        (name: package: builtins.elem system package.meta.platforms)
-        packages
-    );
-
-  targeted = lib.attrs.generate lib'.systems.doubles.all (system:
-    getPackages system generic
-    // {
-      cross = lib.attrs.generate doubles (
-        host: getPackages host generic
-      );
-    });
 in {
   includes = [
     ./aux/foundation.nix
   ];
 
   options = {
-    packages = {
+    packages = lib.options.create {
-      generic = lib.options.create {
+      description = "The package set.";
-        type = lib'.types.packages.generic;
+      type = lib'.types.packages;
-        default.value = {};
     };
 
-      targeted = lib.options.create {
+    preferences.packages = {
-        type = lib'.types.packages.targeted;
+      version = lib.options.create {
+        description = "The preferred package version when using aliases.";
+        type = lib.types.enum ["latest" "stable"];
+        default.value = "latest";
       };
     };
   };
-
-  config = {
-    packages = {
-      inherit targeted;
-    };
-  };
 }