patch & packaging with nix

.gitignore

@@ -0,0 +1 @@
+result

cl-dates.asd

@@ -26,12 +26,12 @@
 
 (in-package :cl-user)
 
-(defpackage :cl-dates
-  (:use :cl :asdf))
+;; (defpackage :cl-dates
+;;   (:use :cl :asdf))
 
-(in-package :cl-dates)
+;; (in-package :cl-dates)
 
-(defsystem :cl-dates
+(asdf:defsystem :cl-dates
   :version "1.0"
   :description "Date arithmetic library for Common Lisp"
   :author "Sudhir Shenoy"
@@ -48,7 +48,7 @@
 	       (:file "calendar")
 	       (:file "bus-date-arith")))
 
-(defsystem :cl-dates-test
+(asdf:defsystem :cl-dates-test
   :description "Date arithmetic library tests"
   :author "Sudhir Shenoy"
   :license "BSD"
@@ -60,6 +60,6 @@
 			     (:file "test-parse-date")
 			     (:file "test-hols")))))
 
-(defmethod perform ((o test-op) (c (eql (find-system :cl-dates))))
-  (operate 'load-op :cl-dates-test)
+(defmethod asdf:perform ((o asdf:test-op) (c (eql (asdf:find-system :cl-dates))))
+  (asdf:operate 'asdf:load-op :cl-dates-test)
   (funcall (intern (symbol-name :run-all-tests) (find-package :cl-dates-test))))

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1765472234,
+        "narHash": "sha256-9VvC20PJPsleGMewwcWYKGzDIyjckEz8uWmT0vCDYK0=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "2fbfb1d73d239d2402a8fe03963e37aab15abe8b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,29 @@
+{
+  description = "A very basic flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    pkgs = import nixpkgs {system = "x86_64-linux";};
+    cl-dates = pkgs.sbcl.buildASDFSystem {
+      pname = "cl-dates";
+      version = "latest";
+      src = ./.;
+    };
+  in {
+    packages.x86_64-linux.default = cl-dates;
+
+    devShells.x86_64-linux.default = pkgs.mkShell {
+      buildInputs = [
+        (pkgs.sbcl.withPackages (ps: [
+          cl-dates
+        ]))
+      ];
+    };
+  };
+}