Make the trivial flake multi system

flake.nix

@@ -1,165 +1,171 @@
 {
   description = "A collection of flake templates";
 
-  outputs = { self }: {
-
-    templates = {
-
-      trivial = {
-        path = ./trivial;
-        description = "A very basic flake";
-      };
-
-      simpleContainer = {
-        path = ./simple-container;
-        description = "A NixOS container running apache-httpd";
-      };
-
-      python = {
-        path = ./python;
-        description = "Python template, using poetry2nix";
-        welcomeText = ''
-          # Getting started
-          - Run `nix develop`
-          - Run `poetry run python -m sample_package`
-        '';
-      };
-
-      rust = {
-        path = ./rust;
-        description = "Rust template, using Naersk";
-      };
-
-      bash-hello = {
-        path = ./bash-hello;
-        description = "An over-engineered Hello World in bash";
-      };
-
-      c-hello = {
-        path = ./c-hello;
-        description = "An over-engineered Hello World in C";
-      };
-
-      ruby = {
-        path = ./ruby;
-        description = "Flake for building ruby gems" ;
-        welcomeText = ''
-          # Simple Ruby Gem Template
-          ## Intended usage
-          The intended usage of this flake is to facilitate building ruby gems
-
-          ## More info
-          - [Ruby language](https://www.ruby-lang.org/)
-          - [Ruby in the NixOS manual](https://nixos.org/manual/nixpkgs/stable/#sec-language-ruby)
-        '';
-      };
-
-      rust-web-server = {
-        path = ./rust-web-server;
-        description = "A Rust web server including a NixOS module";
-      };
-
-      compat = {
-        path = ./compat;
-        description = "A default.nix and shell.nix for backward compatibility with Nix installations that don't support flakes";
-      };
-
-      haskell-hello = {
-        path = ./haskell-hello;
-        description = "A Hello World in Haskell with one dependency";
-      };
-
-      hercules-ci = {
-        path = ./hercules-ci;
-        description = "An example for Hercules-CI, containing only the necessary attributes for adding to your project.";
-      };
-
-      full = {
-        path = ./full;
-        description = "A template that shows all standard flake outputs";
-        welcomeText = ''
-          You just created a template that will show you all standard flake outputs.
-
-          Read more about it here:
-
-            https://github.com/NixOS/templates/tree/master/full
-        '';
-      };
-
-      pandoc-xelatex = {
-        path = ./pandoc-xelatex;
-        description = "A report built with Pandoc, XeLaTex and a custom font";
-      };
-
-      latexmk = {
-        path = ./latexmk;
-        description = "A simple LaTeX template for writing documents with latexmk";
-      };
-
-      go-hello = {
-        path = ./go-hello;
-        description = "A simple Go package";
-      };
-
-      empty = {
-        path = ./empty;
-        description = "A flake with no outputs";
-      };
-
-      haskell-nix = {
-        path = ./haskell.nix;
-        description = "An haskell.nix template using hix";
-        welcomeText = ''
-          You just created an haskell.nix template using hix. Read more about it here:
-          https://input-output-hk.github.io/haskell.nix/tutorials/getting-started-flakes.html
-        '';
-      };
-
-      haskell-flake = {
-        path = ./haskell-flake;
-        description = "A haskell-flake template";
-        welcomeText = ''
-          You just created a haskell-flake template.
-          See the README or https://github.com/srid/haskell-flake.
-        '';
-      };
-
-      utils-generic = {
-        path = ./utils-generic;
-        description = "Simple, all-rounder template with utils enabled and devShell populated";
-      };
-
-      dotnet = {
-        path = ./dotnet;
-        description = "A .NET application and test project";
-      };
-
-      typescript-pnpm = {
-        path = ./typescript/pnpm;
-        description = "A template combining a node webserver and a dev environment
-            for frontend typescript development";
-        welcomeText = ''
-          # Getting Started
-          - run `nix develop` to enter the development environment
-          - run `pnpm install` to install the packaged
-          - run `pnpm start` to open a live reloading website
-        '';
-      };
-
-      typescript-p5js = {
-        path = ./typescript/pnpm-p5js;
-        description = "A template combining a node webserver and a dev environment
-            for frontend typescript development";
-        welcomeText = ''
-          # Getting Started
-          - run `nix develop` to enter the development environment
-          - run `pnpm install` to install the packaged
-          - run `pnpm start` to open a live reloading website
-        '';
-      };
+  outputs =
+    { self }:
+    {
+      templates = {
+        default = self.templates.multi-system;
+
+        multi-system = {
+          path = ./multi-system;
+          description = "A multi-system flake";
+          welcomeText = ''
+            # Getting started
+            - Run `nix develop` to enter the default development environment
+            - Run `nix build` to build the `hello` package from Nixpkgs
+          '';
+        };
+
+        trivial = {
+          path = ./trivial;
+          description = "A very basic flake";
+        };
+
+        simpleContainer = {
+          path = ./simple-container;
+          description = "A NixOS container running apache-httpd";
+        };
+
+        python = {
+          path = ./python;
+          description = "Python template, using poetry2nix";
+          welcomeText = ''
+            # Getting started
+            - Run `nix develop`
+            - Run `poetry run python -m sample_package`
+          '';
+        };
+
+        rust = {
+          path = ./rust;
+          description = "Rust template, using Naersk";
+        };
+
+        bash-hello = {
+          path = ./bash-hello;
+          description = "An over-engineered Hello World in bash";
+        };
+
+        c-hello = {
+          path = ./c-hello;
+          description = "An over-engineered Hello World in C";
+        };
+
+        ruby = {
+          path = ./ruby;
+          description = "Flake for building ruby gems";
+          welcomeText = ''
+            # Simple Ruby Gem Template
+            ## Intended usage
+            The intended usage of this flake is to facilitate building ruby gems
+
+            ## More info
+            - [Ruby language](https://www.ruby-lang.org/)
+            - [Ruby in the NixOS manual](https://nixos.org/manual/nixpkgs/stable/#sec-language-ruby)
+          '';
+        };
+
+        rust-web-server = {
+          path = ./rust-web-server;
+          description = "A Rust web server including a NixOS module";
+        };
+
+        compat = {
+          path = ./compat;
+          description = "A default.nix and shell.nix for backward compatibility with Nix installations that don't support flakes";
+        };
+
+        haskell-hello = {
+          path = ./haskell-hello;
+          description = "A Hello World in Haskell with one dependency";
+        };
+
+        hercules-ci = {
+          path = ./hercules-ci;
+          description = "An example for Hercules-CI, containing only the necessary attributes for adding to your project.";
+        };
+
+        full = {
+          path = ./full;
+          description = "A template that shows all standard flake outputs";
+          welcomeText = ''
+            You just created a template that will show you all standard flake outputs.
+
+            Read more about it here:
+
+              https://github.com/NixOS/templates/tree/master/full
+          '';
+        };
+
+        pandoc-xelatex = {
+          path = ./pandoc-xelatex;
+          description = "A report built with Pandoc, XeLaTex and a custom font";
+        };
+
+        latexmk = {
+          path = ./latexmk;
+          description = "A simple LaTeX template for writing documents with latexmk";
+        };
+
+        go-hello = {
+          path = ./go-hello;
+          description = "A simple Go package";
+        };
+
+        empty = {
+          path = ./empty;
+          description = "A flake with no outputs";
+        };
+
+        haskell-nix = {
+          path = ./haskell.nix;
+          description = "An haskell.nix template using hix";
+          welcomeText = ''
+            You just created an haskell.nix template using hix. Read more about it here:
+            https://input-output-hk.github.io/haskell.nix/tutorials/getting-started-flakes.html
+          '';
+        };
+
+        haskell-flake = {
+          path = ./haskell-flake;
+          description = "A haskell-flake template";
+          welcomeText = ''
+            You just created a haskell-flake template.
+            See the README or https://github.com/srid/haskell-flake.
+          '';
+        };
+
+        utils-generic = self.templates.multi-system;
+
+        dotnet = {
+          path = ./dotnet;
+          description = "A .NET application and test project";
+        };
+
+        typescript-pnpm = {
+          path = ./typescript/pnpm;
+          description = "A template combining a Node.js webserver and a dev environment for frontend TypeScript development";
+          welcomeText = ''
+            # Getting Started
+            - run `nix develop` to enter the development environment
+            - run `pnpm install` to install the packaged
+            - run `pnpm start` to open a live reloading website
+          '';
+        };
+
+        typescript-p5js = {
+          path = ./typescript/pnpm-p5js;
+          description = "A template combining a Node.js webserver and a dev environment for frontend TypeScript development";
+          welcomeText = ''
+            # Getting Started
+            - run `nix develop` to enter the development environment
+            - run `pnpm install` to install the packaged
+            - run `pnpm start` to open a live reloading website
+          '';
+        };
+      };
+
+      defaultTemplate = self.templates.trivial;
     };
-
-    defaultTemplate = self.templates.trivial;
-
-  };
 }

multi-system/flake.nix

@@ -0,0 +1,50 @@
+{
+  description = "A very basic flake";
+
+  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+
+  outputs =
+    { self, nixpkgs }:
+    let
+      # Systems supported by this flake
+      supportedSystems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "aarch64-darwin"
+      ];
+      # A helper function for specifying per-system outputs
+      forEachSupportedSystem =
+        f:
+        nixpkgs.lib.genAttrs supportedSystems (
+          system:
+          f {
+            pkgs = import nixpkgs { inherit system; };
+          }
+        );
+    in
+    {
+      # Development environments
+      devShells = forEachSupportedSystem (
+        { pkgs }:
+        {
+          default = pkgs.mkShell {
+            packages = with pkgs; [
+              # Add development environment packages here
+            ];
+          };
+        }
+      );
+
+      # Package outputs
+      packages = forEachSupportedSystem (
+        { pkgs }:
+        {
+          # Build this by running `nix build`, `nix build .`, or `nix build .#default`
+          default = pkgs.hello;
+          # Build this by running `nix build .#hello`
+          hello = pkgs.hello;
+        }
+      );
+    };
+}