modules/dependencies: init + add curl

modules/dependencies.nix

@@ -0,0 +1,30 @@
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}:
+let
+  cfg = config.dependencies;
+
+  packages = {
+    curl.default = "curl";
+  };
+
+  mkDependencyOption = name: properties: {
+    enable = lib.mkEnableOption "Add ${name} to dependencies.";
+
+    package = lib.mkPackageOption pkgs name properties;
+  };
+in
+{
+  options.dependencies = lib.mapAttrs mkDependencyOption packages;
+
+  config = {
+    extraPackages = lib.pipe cfg [
+      builtins.attrValues
+      (builtins.filter (p: p.enable))
+      (builtins.map (p: p.package))
+    ];
+  };
+}