usage: init at 0.3.1

pkgs/by-name/us/usage/package.nix

@@ -0,0 +1,36 @@
+{
+  lib,
+  rustPlatform,
+  fetchFromGitHub,
+  nix-update-script,
+  usage,
+  testers,
+}:
+
+rustPlatform.buildRustPackage rec {
+  pname = "jdx";
+  version = "0.3.1";
+
+  src = fetchFromGitHub {
+    owner = "jdx";
+    repo = "usage";
+    rev = "v${version}";
+    hash = "sha256-9zQ+gkBVhzjqSIieGjxoD9vc7999lfRQ7awkvlEkseE=";
+  };
+
+  cargoHash = "sha256-4ebjD1Tf7F2YyNrF7eEi2yKonctprnyu4nMf+vE2whY=";
+
+  passthru = {
+    updateScript = nix-update-script { };
+    tests.version = testers.testVersion { package = usage; };
+  };
+
+  meta = {
+    homepage = "https://usage.jdx.dev";
+    description = "Specification for CLIs";
+    changelog = "https://github.com/jdx/usage/releases/tag/v${version}";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ konradmalik ];
+    mainProgram = "usage";
+  };
+}