initial commit

source/recipes/build/nixpkg/flake.nix

@@ -0,0 +1,42 @@
+{
+  description = "a very simple and friendly flake";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+      in
+      {
+        devShells = rec {
+          default = pkgs.mkShell {
+            packages = [ pkgs.cowsay ];
+          };
+        };
+
+        packages = rec {
+          hello = pkgs.writeShellApplication {
+            name = "hello-cow";
+
+            runtimeInputs = [
+              pkgs.cowsay
+            ];
+
+            text = ''
+              cowsay "hello";
+            '';
+          };
+          default = hello;
+        };
+
+        apps = rec {
+          hello = flake-utils.lib.mkApp { drv = self.packages.${system}.hello; };
+          default = hello;
+        };
+      }
+    );
+}