Improve advanced example

- shows how to override which systems are exposed from the resulting flake.

- use a custom nixpkgs ref

Author: vic

lib/devshell-flake.nix

@@ -1,7 +1,11 @@
 {
-  inputs.devshell.url = "github:numtide/devshell";
+
+  inputs.nixpkgs.url = "github:cachix/devenv-nixpkgs/rolling";
   inputs.systems.url = "github:nix-systems/default";
 
+  inputs.devshell.url = "github:numtide/devshell";
+  inputs.devshell.inputs.nixpkgs.follows = "nixpkgs";
+
   inputs.source.url = "path:./source";
   inputs.source.flake = false;
 

templates/advanced/flake.toml

@@ -1,14 +1,29 @@
-[inputs.something]
-url = "path:./something"
+# Custom nixpkgs distribution
+[inputs.nixpkgs]
+url = "github:nixos/nixpkgs?ref=release-24.11"
+[inputs.devshell]
+url = "github:numtide/devshell"
+inputs.nixpkgs.follows = "nixpkgs"
+
+# Custom exposed systems
+[inputs.systems]
+url = "path:./systems.nix"
+flake = false
 
+# non-flake dependency read by bat.nix
 [inputs.file]
 url = "path:./file"
 flake = false
 
+# example flake exposing two overlays
+[inputs.something]
+url = "path:./something"
+
+# load overlays
 [[overlays]]
 something = "foo"
 [[overlays]]
 something = "moo"
 
 [nix-config]
-allowUnfree = true
+allowUnfree = true # because we want hello-unfree

templates/advanced/systems.nix

@@ -0,0 +1 @@
+[ "x86_64-linux" ]