From afa811c9304b3059ffa4f149314c0254e590cda3 Mon Sep 17 00:00:00 2001
From: "Vlad P. Luchian" <cstmlcodes@gmail.com>
Date: Thu, 9 Mar 2023 10:00:27 +0000
Subject: [PATCH] new: add nix flake + instructions on how to use

---
 .gitignore |  6 +++++-
 README.md  | 22 +++++++++++++++++++---
 flake.nix  | 31 +++++++++++++++++++++++++++++++
 3 files changed, 55 insertions(+), 4 deletions(-)
 create mode 100644 flake.nix

diff --git a/.gitignore b/.gitignore
index 7e3e74b..9447bfa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -203,4 +203,8 @@ sftp-config.json
 
 # Vagrant
 .vagrant/
-ubuntu-xenial-16.04-cloudimg-console.log
\ No newline at end of file
+ubuntu-xenial-16.04-cloudimg-console.log
+
+
+# Direnv
+.direnv
diff --git a/README.md b/README.md
index da88f1c..8707d7e 100644
--- a/README.md
+++ b/README.md
@@ -14,9 +14,10 @@ completed.
 
 You have a few options for installation:
 
-- Install the dependencies for the koans (such as Clojure) on your machine
-- Use Vagrant and the configuration in this repository
-- Use Docker
+- Install the dependencies for the koans (such as Clojure) on your machine.
+- Use Vagrant and the configuration in this repository.
+- Use Docker.
+- Use Nix Develop environment.
 
 Instructions for each option are below!
 
@@ -69,6 +70,21 @@ To start up a REPL:
 docker run --rm -it -v $(pwd):/app -w /app clojure lein repl
 ```
 
+### Installation with Nix Develop Environment
+
+Make sure you have [nix](https://nixos.wiki/wiki/Nix_Installation_Guide) setup,
+then run: 
+
+```
+nix --experimental-features 'nix-command flakes' develop
+```
+
+This will drop you into a shell with all the required dependencies installed.
+To run koans, in the root of the repository run:
+
+```
+lein koan run
+```
 
 ## Running the Koans
 
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..dcbc936
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,31 @@
+{
+  description = "Clojure Koans";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = inputs@{ self, nixpkgs, flake-utils, ... }:
+  flake-utils.lib.eachDefaultSystem (system:
+  let
+    overlays = [ ];
+
+    pkgs = import nixpkgs {inherit system overlays;};
+
+    additionalPkgs = with pkgs; [  ];
+
+    buildPkgs = with pkgs; [ clojure leiningen ]; 
+
+    project = pkgs.stdenv.mkDerivation {
+      name = "koans-env";
+      root = self;
+      buildInputs = buildPkgs;
+      shellInputs = additionalPkgs;
+    };
+
+  in {
+  defaultPackage = project;
+  devShell = project;
+  });
+}