From f2e42edb608695f02822ad13ecc7bce2fa891e43 Mon Sep 17 00:00:00 2001
From: Robert Hensing <robert@roberthensing.nl>
Date: Wed, 11 May 2022 23:05:53 +0200
Subject: [PATCH] Add multi-module template

---
 flake.nix                                    | 18 ++++++++---
 template/multi-module/flake.nix              | 33 ++++++++++++++++++++
 template/multi-module/hello/flake-module.nix | 18 +++++++++++
 3 files changed, 64 insertions(+), 5 deletions(-)
 create mode 100644 template/multi-module/flake.nix
 create mode 100644 template/multi-module/hello/flake-module.nix

diff --git a/flake.nix b/flake.nix
index 81c2eda..f94577b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,11 +7,19 @@
 
   outputs = { self, nixpkgs, ... }: {
     lib = import ./lib.nix { inherit (nixpkgs) lib; };
-    defaultTemplate = {
-      path = ./template/default;
-      description = ''
-        A minimal flake using flake-modules-core.
-      '';
+    templates = {
+      default = {
+        path = ./template/default;
+        description = ''
+          A minimal flake using flake-modules-core.
+        '';
+      };
+      multi-module = {
+        path = ./template/multi-module;
+        description = ''
+          A minimal flake using flake-modules-core.
+        '';
+      };
     };
   };
 
diff --git a/template/multi-module/flake.nix b/template/multi-module/flake.nix
new file mode 100644
index 0000000..eba8a28
--- /dev/null
+++ b/template/multi-module/flake.nix
@@ -0,0 +1,33 @@
+{
+  description = "Description for the project";
+
+  inputs = {
+    flake-modules-core.url = "github:hercules-ci/flake-modules-core";
+    flake-modules-core.inputs.nixpkgs.follows = "nixpkgs";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, flake-modules-core, ... }:
+    (flake-modules-core.lib.evalFlakeModule
+      { inherit self; }
+      {
+        imports = [
+          ./hello/flake-module.nix
+        ];
+        systems = [ "x86_64-linux" "aarch64-darwin" ];
+        perSystem = system: { config, self', inputs', ... }: {
+          # Per-system attributes can be defined here. The self' and inputs'
+          # module parameters provide easy access to attributes of the same
+          # system.
+
+          packages.figlet = inputs'.nixpkgs.legacyPackages.figlet;
+        };
+        flake = {
+          # The usual flake attributes can be defined here, including system-
+          # agnostic ones like nixosModule and system-enumerating ones, although
+          # those are more easily expressed in perSystem.
+
+        };
+      }
+    ).config.flake;
+}
diff --git a/template/multi-module/hello/flake-module.nix b/template/multi-module/hello/flake-module.nix
new file mode 100644
index 0000000..e0cdbfe
--- /dev/null
+++ b/template/multi-module/hello/flake-module.nix
@@ -0,0 +1,18 @@
+
+# Definitions can be imported from a separate file like this one
+
+{ self, ... }: {
+  perSystem = system: { config, self', inputs', ... }: {
+    # Definitions like this are entirely equivalent to the ones
+    # you may have directly in flake.nix.
+    packages.hello = inputs'.nixpkgs.legacyPackages.hello;
+  };
+  flake = {
+    nixosModules.hello = { pkgs, ... }: {
+      environment.systemPackages = [
+        # or self.inputs.nixpkgs.legacyPackages.${pkgs.stdenv.hostPlatform.system}.hello
+        self.packages.${pkgs.stdenv.hostPlatform.system}.hello
+      ];
+    };
+  };
+}
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