modules/frontmatter: init module interface as source of frontmatter

lib/constraints/interface.nix

@@ -13,6 +13,7 @@ in
     type = types.str;
     default = moduleName;
     readOnly = true;
+    visible = false;
   };
   options.roles = lib.mapAttrs (
     _name: _:
@@ -37,24 +38,9 @@ in
     }
   ) rolesAttrs;
 
-  options.instances = mkOption {
-    default = { };
-    type = types.submoduleWith {
-      modules = [
-        {
-          options = {
-            max = mkOption {
-              type = types.nullOr types.int;
-              default = null;
-            };
-          };
-        }
-      ];
-    };
-  };
-
   # The resulting assertions
   options.assertions = mkOption {
+    visible = false;
     default = { };
     type = types.attrsOf (
       types.submoduleWith {

lib/default.nix

@@ -5,16 +5,16 @@
   ...
 }:
 let
-  eval = import ./eval-clan-modules {
+  evalClan = import ./eval-clan-modules {
     inherit clan-core lib;
     pkgs = nixpkgs.legacyPackages.x86_64-linux;
   };
 in
 {
-  inherit (eval) evalClanModules evalClanModulesWithRoles;
+  inherit (evalClan) evalClanModules evalClanModulesWithRoles;
   buildClan = import ./build-clan { inherit lib nixpkgs clan-core; };
   facts = import ./facts.nix { inherit lib; };
   inventory = import ./inventory { inherit lib clan-core; };
   jsonschema = import ./jsonschema { inherit lib; };
-  modules = import ./description.nix { inherit clan-core lib; };
+  modules = import ./frontmatter { inherit clan-core lib; };
 }

lib/eval-clan-modules/default.nix

@@ -62,7 +62,7 @@ let
           roles =
             if builtins.elem "inventory" frontmatter.features or [ ] then
               assert lib.isPath module;
-              clan-core.lib.modules.getRoles' moduleName
+              clan-core.lib.modules.getRoles moduleName
             else
               [ ];
         in

lib/frontmatter/default.nix

@@ -1,8 +1,38 @@
 { clan-core, lib }:
 let
+  # Trim the .nix extension from a filename
   trimExtension = name: builtins.substring 0 (builtins.stringLength name - 4) name;
 
-  getRoles' =
+  evalFrontmatter =
+    {
+      moduleName,
+      instanceName,
+      resolvedRoles,
+    }:
+    lib.evalModules {
+      specialArgs = {
+        inherit moduleName resolvedRoles instanceName;
+        allRoles = getRoles moduleName;
+      };
+      modules = [
+        (getFrontmatter moduleName)
+        ./interface.nix
+      ];
+    };
+
+  frontmatterDocsOptions =
+    lib.optionAttrSetToDocList
+      (lib.evalModules {
+        specialArgs = {
+          moduleName = "{moduleName}";
+          allRoles = [ "{roleName}" ];
+        };
+        modules = [
+          ./interface.nix
+        ];
+      }).options;
+
+  getRoles =
     serviceName:
     lib.mapAttrsToList (name: _value: trimExtension name) (
       lib.filterAttrs (name: type: type == "regular" && lib.hasSuffix ".nix" name) (
@@ -15,46 +45,9 @@ let
       )
     );
 
-  getConstraints =
-    modulename:
-    let
-      eval = lib.evalModules {
-        specialArgs = {
-          allRoles = getRoles' modulename;
-        };
-        modules = [
-          ./constraints/interface.nix
-          (getFrontmatter modulename).constraints
-        ];
-      };
-    in
-    eval.config.roles;
+  getConstraints = modulename: (getFrontmatter modulename).constraints;
 
-  checkConstraints =
-    {
-      moduleName,
-      resolvedRoles,
-      instanceNames,
-      instanceName,
-    }:
-    let
-      eval = lib.evalModules {
-        specialArgs = {
-          inherit
-            moduleName
-            instanceNames
-            instanceName
-            resolvedRoles
-            ;
-          allRoles = getRoles' moduleName;
-        };
-        modules = [
-          ./constraints/default.nix
-          ((getFrontmatter moduleName).constraints or { })
-        ];
-      };
-    in
-    eval.config.assertions;
+  checkConstraints = args: (evalFrontmatter args).config.constraints.assertions;
 
   getReadme =
     modulename:
@@ -97,10 +90,13 @@ let
 in
 {
   inherit
+    evalFrontmatter
+    frontmatterDocsOptions
+
     getFrontmatter
     getReadme
-    getRoles'
     getConstraints
     checkConstraints
+    getRoles
     ;
 }

lib/frontmatter/interface.nix

@@ -0,0 +1,58 @@
+{
+  lib,
+  specialArgs,
+  ...
+}:
+let
+  inherit (lib) mkOption types;
+in
+{
+  options = {
+    description = mkOption {
+      type = types.str;
+      description = ''
+
+      '';
+    };
+    categories = mkOption {
+      default = [ "Uncategorized" ];
+      type = types.listOf (
+        types.enum [
+          "AudioVideo"
+          "Audio"
+          "Video"
+          "Development"
+          "Education"
+          "Game"
+          "Graphics"
+          "Social"
+          "Network"
+          "Office"
+          "Science"
+          "System"
+          "Settings"
+          "Utility"
+          "Uncategorized"
+        ]
+      );
+    };
+    features = mkOption {
+      default = [ ];
+      type = types.listOf (
+        types.enum [
+          "inventory"
+        ]
+      );
+    };
+
+    constraints = mkOption {
+      default = { };
+      type = types.submoduleWith {
+        inherit specialArgs;
+        modules = [
+          ../constraints
+        ];
+      };
+    };
+  };
+}

lib/inventory/build-inventory/default.nix

@@ -94,7 +94,7 @@ let
         acc2: instanceName: serviceConfig:
 
         let
-          roles = clan-core.lib.modules.getRoles' serviceName;
+          roles = clan-core.lib.modules.getRoles serviceName;
 
           resolvedRoles = lib.genAttrs roles (
             roleName:
@@ -152,7 +152,6 @@ let
           constraintAssertions = clan-core.lib.modules.checkConstraints {
             moduleName = serviceName;
             inherit resolvedRoles instanceName;
-            instanceNames = builtins.attrNames serviceConfigs;
           };
         in
         if (nonExistingRoles != [ ]) then