vars: init

- init eval tests
- init basic interface

nixosModules/clanCore/vars/flake-module.nix

@@ -0,0 +1,31 @@
+{
+  self,
+  inputs,
+  lib,
+  ...
+}:
+let
+  inputOverrides = builtins.concatStringsSep " " (
+    builtins.map (input: " --override-input ${input} ${inputs.${input}}") (builtins.attrNames inputs)
+  );
+in
+{
+  perSystem =
+    { system, pkgs, ... }:
+    {
+      legacyPackages.evalTests-module-clan-vars = import ./eval-tests {
+        inherit lib;
+        clan-core = self;
+      };
+      checks.module-clan-vars-eval = pkgs.runCommand "tests" { nativeBuildInputs = [ pkgs.nix-unit ]; } ''
+        export HOME="$(realpath .)"
+
+        nix-unit --eval-store "$HOME" \
+          --extra-experimental-features flakes \
+          ${inputOverrides} \
+          --flake ${self}#legacyPackages.${system}.evalTests-module-clan-vars
+
+        touch $out
+      '';
+    };
+}