add "init" template for an empty dev env

flake.nix

@@ -47,5 +47,10 @@
         path = ./templates/compiler-dev;
         description = "A development environment for Zig compiler development.";
       };
+
+      templates.init = {
+        path = ./templates/init;
+        description = "A basic, empty development environment.";
+      };
     };
 }

templates/init/.envrc

@@ -0,0 +1,5 @@
+# If we are a computer with nix-shell available, then use that to setup
+# the build environment with exactly what we need.
+if has nix; then
+  use nix
+fi

templates/init/flake.nix

@@ -0,0 +1,46 @@
+{
+  description = "An empty project that uses Zig.";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/release-22.05";
+    flake-utils.url = "github:numtide/flake-utils";
+    zig.url = "github:mitchellh/zig-overlay";
+
+    # Used for shell.nix
+    flake-compat = {
+      url = github:edolstra/flake-compat;
+      flake = false;
+    };
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+    ...
+  } @ inputs: let
+    overlays = [
+      # Other overlays
+      (final: prev: {
+        zigpkgs = inputs.zig.packages.${prev.system};
+      })
+    ];
+
+    # Our supported systems are the same supported systems as the Zig binaries
+    systems = builtins.attrNames inputs.zig.packages;
+  in
+    flake-utils.lib.eachSystem systems (
+      system: let
+        pkgs = import nixpkgs {inherit overlays system;};
+      in rec {
+        devShells.default = pkgs.mkShell {
+          nativeBuildInputs = with pkgs; [
+            zigpkgs.master
+          ];
+        };
+
+        # For compatibility with older versions of the `nix` binary
+        devShell = self.devShells.${system}.default;
+      }
+    );
+}

templates/init/shell.nix

@@ -0,0 +1,12 @@
+(import
+  (
+    let
+      flake-compat = (builtins.fromJSON (builtins.readFile ./flake.lock)).nodes.flake-compat;
+    in
+      fetchTarball {
+        url = "https://github.com/edolstra/flake-compat/archive/${flake-compat.locked.rev}.tar.gz";
+        sha256 = flake-compat.locked.narHash;
+      }
+  )
+  {src = ./.;})
+.shellNix