From 0d9c704c242615e26010f3f1a2af13d998f11675 Mon Sep 17 00:00:00 2001
From: Rose Hogenson <rosehogenson@posteo.net>
Date: Sun, 7 Sep 2025 09:46:09 -0700
Subject: Reapply "Flake"

This reverts commit 41065c5b868d7da1caf26ba88a29eb505a49f014.
---
 default.nix | 10 ----------
 flake.nix   | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+), 10 deletions(-)
 delete mode 100644 default.nix
 create mode 100644 flake.nix

diff --git a/default.nix b/default.nix
deleted file mode 100644
index 8a3b091..0000000
--- a/default.nix
+++ /dev/null
@@ -1,10 +0,0 @@
-{ pkgs ? import <nixpkgs> {} }:
-
-pkgs.buildGoPackage {
-  pname = "roseh.moe";
-  version = "1.0.0";
-
-  src = ./.;
-
-  goPackagePath = "gitlab.com/rhogenson/roseh.moe";
-}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..1b2ec43
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,60 @@
+{
+  description = "A simple Go package";
+
+  # Nixpkgs / NixOS version to use.
+  inputs.nixpkgs.url = "nixpkgs/nixos-unstable";
+
+  outputs = { self, nixpkgs }:
+    let
+
+      # to work with older version of flakes
+      lastModifiedDate = self.lastModifiedDate or self.lastModified or "19700101";
+
+      # Generate a user-friendly version number.
+      version = builtins.substring 0 8 lastModifiedDate;
+
+      # System types to support.
+      supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
+
+      # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+
+      # Nixpkgs instantiated for supported system types.
+      nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; });
+
+    in
+    {
+
+      # Provide some binary packages for selected system types.
+      packages = forAllSystems (system:
+        let
+          pkgs = nixpkgsFor.${system};
+        in
+        {
+          rosehdotmoe = pkgs.buildGoModule {
+            pname = "rosehdotmoe";
+            inherit version;
+            # In 'nix develop', we don't need a copy of the source tree
+            # in the Nix store.
+            src = ./.;
+
+            # This hash locks the dependencies of this package. It is
+            # necessary because of how Go requires network access to resolve
+            # VCS.  See https://www.tweag.io/blog/2021-03-04-gomod2nix/ for
+            # details. Normally one can build with a fake hash and rely on native Go
+            # mechanisms to tell you what the hash should be or determine what
+            # it should be "out-of-band" with other tooling (eg. gomod2nix).
+            # To begin with it is recommended to set this, but one must
+            # remember to bump this hash when your dependencies change.
+            # vendorHash = pkgs.lib.fakeHash;
+
+            vendorHash = pkgs.libs.fakeHash;
+          };
+        });
+
+      # The default package for 'nix build'. This makes sense if the
+      # flake provides only one package or there is a clear "main"
+      # package.
+      defaultPackage = forAllSystems (system: self.packages.${system}.rosehdotmoe);
+    };
+}
-- 
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