add templates

flake.nix

@@ -91,7 +91,15 @@
                     };
 
                     setNixpkgsFlakeAlias = lib.mkOption {
-                      description = "Set nix path entry for `nixpkgs` to self";
+                      description = "Set flake registry entry for `nixpkgs` to self";
+                      type = lib.types.bool;
+                      default = true;
+                      defaultText = lib.literalExpression "true";
+                      example = lib.literalExpression "false";
+                    };
+
+                    setTemplatesFlakeAlias = lib.mkOption {
+                      description = "Set flake registry entry for `templates` to self";
                       type = lib.types.bool;
                       default = true;
                       defaultText = lib.literalExpression "true";
@@ -99,12 +107,19 @@
                     };
                   };
 
-                  config.nix.registry.dragnpkgs-unstable = lib.mkIf config.dragnpkgs.setFlakeRegistry self.meta.registry-entry;
+                  config.nix.registry.dragnpkgs-unstable =
+                    lib.mkIf config.dragnpkgs.setFlakeRegistry self.meta.registry-entry;
+
                   config.nix.registry.nixpkgs = lib.mkIf config.dragnpkgs.setNixpkgsFlakeAlias {
                     from = { id = "nixpkgs"; type = "indirect"; };
                     to = { id = "dragnpkgs-unstable"; type = "indirect"; };
                   };
 
+                  config.nix.registry.templates = lib.mkIf config.dragnpkgs.setTemplatesFlakeAlias {
+                    from = { id = "templates"; type = "indirect"; };
+                    to = { id = "dragnpkgs-unstable"; type = "indirect"; };
+                  };
+
                   config.nix.nixPath = lib.mkIf config.dragnpkgs.setNixPath [
                     self.meta.path-entry
                   ];
@@ -139,5 +154,14 @@
       );
 
       nixosModules = nixpkgs.nixosModules;
+
+      templates = {
+        default = {
+          path = ./templates/default;
+          description = "A very basic flake (with dragnpkgs)";
+        };
+      };
+
+      defaultTemplate = self.templates.default;
     };
 }

templates/default/flake.nix

@@ -0,0 +1,14 @@
+{
+  description = "A very basic flake";
+
+  outputs = { self, dragnpkgs } @ inputs: {
+    packages.hello = { stdenv }: stdenv.mkDerivation {
+      name = "hello";
+      src = self;
+
+      installPhase = ''
+        echo TODO
+      '';
+    };
+  };
+}