Add flake for supporting NixOs and nix systems

.envrc

@@ -0,0 +1,3 @@
+if has nix_direnv_version; then
+  use flake
+fi

.gitignore

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

NIX.md

@@ -0,0 +1,19 @@
+# NixOS and Flakes
+
+The package contains all the required install scripts and dependencies. You can use the flake as:
+
+```nix
+{
+    inputs = {
+        # ...
+        amber.url = "github:Ph0enixKM/Amber";
+    };
+
+    # then later with home manager for example
+    home.packages = [ inputs.amber.packages.${pkgs.system}.default ];
+}
+```
+
+The package is avaiable as `amber-lang` on [nixpkgs](https://github.com/NixOS/nixpkgs/pull/313774).
+
+While developing with Nix, the flake defines all dependencies for `nix develop` (or `direnv` if used).

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 +38,10 @@ Amber is packaged in the following distros:
 
 Arch (AUR) - `amber-bash-bin`
 
+#### Nix
+
+See [NIX.md](./NIX.md)
+
 ### 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.
 

flake.nix

@@ -0,0 +1,29 @@
+{
+  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
+      {
+        packages.default = naersk-lib.buildPackage {
+          src = ./.;
+          postInsall = ''
+            wrapProgram "$out/bin/amber" --set PATH ${nixpkgs.lib.makeBinPath [
+              pkgs.bc
+            ]}
+          '';
+        };
+        devShells.default = with pkgs; mkShell {
+          buildInputs = [ bc cargo rustc rustfmt pre-commit rustPackages.clippy ];
+          RUST_SRC_PATH = rustPlatform.rustLibSrc;
+        };
+      }
+    );
+}

src/compiler.rs

@@ -119,13 +119,13 @@ 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)]
     pub fn test_eval(&mut self) -> Result<String, Message> {
         self.compile().map_or_else(Err, |(_, code)| {
-            let child = Command::new("/bin/bash")
+            let child = Command::new("/usr/bin/env").arg("bash")
                 .arg("-c").arg::<&str>(code.as_ref())
                 .output().unwrap();
             Ok(String::from_utf8_lossy(&child.stdout).to_string())
@@ -137,4 +137,4 @@ impl AmberCompiler {
             include_str!("std/main.ab")
         ].join("\n")
     }
-}
+}