Add flake for supporting NixOs and nix systems

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -8,4 +8,8 @@ test*.sh
 flamegraph.svg
 
 # MacOS
-**/.DS_Store
+**/.DS_Store
+
+# Nixos
+.direnv
+result

README.md

@@ -15,6 +15,7 @@ Programming language that compiles to Bash. It's a high level programming langua
 Amber compiler currently works on:
 - Linux x86 and ARM
 - macOS x86 and ARM (Apple Silicon)
+- Nix (NixOs)
 
 ### macOS / Linux
 Make sure that the operating system meets the following prerequisites
@@ -37,6 +38,27 @@ Amber is packaged in the following distros:
 
 Arch (AUR) - `amber-bash-bin`
 
+#### Nix
+
+The package is already containing all the required install scripts and dependencies. You can use the flake as:
+
+```nix
+{
+    inputs = {
+        # ...
+        amber.url = "github:brumik/ytsum";
+    };
+
+    # outputs somewhere
+    amber = inputs.amber.defaultPackage."${pkgs.system}";
+
+    # then later with home manager for example
+    home.packages = [ amber ];
+}
+```
+
+While developing on Nixos the flake also defines all dependencies for `nix develop` (or `direnv` if used).
+
 ### Windows support
 As windows does not come with bash installed it makes no sense to support it. Please install WSL 2 on your windows machine and install Linux version of Amber compiler inside.
 

default.nix

@@ -0,0 +1,7 @@
+(import (
+  fetchTarball {
+    url = "https://github.com/edolstra/flake-compat/archive/99f1c2157fba4bfe6211a321fd0ee43199025dbf.tar.gz";
+    sha256 = "0x2jn3vrawwv9xp15674wjz9pixwjyj3j771izayl962zziivbx2"; }
+) {
+  src =  ./.;
+}).defaultNix

flake.nix

@@ -0,0 +1,30 @@
+{
+  inputs = {
+    naersk.url = "github:nix-community/naersk/master";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, utils, naersk }:
+    utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        naersk-lib = pkgs.callPackage naersk { };
+      in
+      {
+        defaultPackage = naersk-lib.buildPackage {
+          src = ./.;
+          postInsall = ''
+            wrapProgram "$out/bin/amber" --set PATH ${nixpkgs.lib.makeBinPath [
+              pkgs.bash
+              pkgs.bc
+            ]}
+          '';
+        };
+        devShell = with pkgs; mkShell {
+          buildInputs = [ bc bash cargo rustc rustfmt pre-commit rustPackages.clippy ];
+          RUST_SRC_PATH = rustPlatform.rustLibSrc;
+        };
+      }
+    );
+}

shell.nix

@@ -0,0 +1,7 @@
+(import (
+  fetchTarball {
+    url = "https://github.com/edolstra/flake-compat/archive/99f1c2157fba4bfe6211a321fd0ee43199025dbf.tar.gz";
+    sha256 = "0x2jn3vrawwv9xp15674wjz9pixwjyj3j771izayl962zziivbx2"; }
+) {
+  src =  ./.;
+}).shellNix

src/compiler.rs

@@ -119,7 +119,7 @@ impl AmberCompiler {
 
     pub fn execute(code: String, flags: &[String]) {
         let code = format!("set -- {};\n\n{}", flags.join(" "), code);
-        Command::new("/bin/bash").arg("-c").arg(code).spawn().unwrap().wait().unwrap();
+        Command::new("/usr/bin/env").arg("bash").arg("-c").arg(code).spawn().unwrap().wait().unwrap();
     }
 
     #[allow(dead_code)]
@@ -137,4 +137,4 @@ impl AmberCompiler {
             include_str!("std/main.ab")
         ].join("\n")
     }
-}
+}