Add nix shell and note on how to release new versions

README.md

@@ -20,6 +20,13 @@ When generating documentation, it's best to set the version to the current one,
 
 That is, in sbt run: `set version := "0.5.0"`, before running `mdoc` in `docs`.
 
+## Releasing a new version
+
+```sh
+$ nix develop
+$ sbt ci-release
+```
+
 ## Copyright
 
 Copyright (C) 2019 SoftwareMill [https://softwaremill.com](https://softwaremill.com).

flake.nix

@@ -0,0 +1,31 @@
+{
+  inputs.nixpkgs.url = "github:nixos/nixpkgs";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs = { self, nixpkgs, flake-utils, ... }@inputs:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        shellPackages = [
+          "jre"
+          "sbt"
+          "nodejs"
+          "yarn"
+        ];
+      in
+      {
+        devShell = pkgs.mkShell {
+          buildInputs = map (pkgName: pkgs.${pkgName}) shellPackages;
+          welcomeMessage = ''
+            Welcome to the Diffx Nix shell! 👋
+            Available packages:
+            ${builtins.concatStringsSep "\n" (map (n : "- ${n}") shellPackages)}
+          '';
+
+          shellHook = ''
+            echo "$welcomeMessage"
+          '';
+        };
+      }
+    );
+}

shell.nix

@@ -0,0 +1,12 @@
+# For compatibility with non-flake-enabled Nix versions
+{ system ? builtins.currentSystem, ... }:
+(
+  import
+    (
+      fetchTarball {
+        url = "https://github.com/edolstra/flake-compat/archive/b7547d3eed6f32d06102ead8991ec52ab0a4f1a7.tar.gz";
+        sha256 = "09ln95rvvjxjsnmvzrvyc2ji2l5lz17s671z51f9z8cl4m23ndp2";
+      }
+    )
+    { src = ./.; }
+).shellNix