Add Nix flake (#73)

README.md

@@ -43,6 +43,12 @@ On Arch Linux a package is available in the Arch User Repositories (AUR). To ins
 paru iamb-git
 ```
 
+### Nix / NixOS (flake)
+
+```
+nix profile install "github:ulyssa/iamb"
+```
+
 ## Configuration
 
 You can create a basic configuration in `$CONFIG_DIR/iamb/config.json` that looks like:

flake.nix

@@ -0,0 +1,39 @@
+{
+  description = "iamb";
+  nixConfig.bash-prompt = "\[nix-develop\]$ ";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, rust-overlay, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        # We only need the nightly overlay in the devShell because .rs files are formatted with nightly.
+        overlays = [ (import rust-overlay) ];
+        pkgs = import nixpkgs { inherit system overlays; };
+        rustNightly = pkgs.rust-bin.nightly."2023-03-17".default;
+      in 
+      with pkgs;
+      {
+        packages.default = pkgs.rustPlatform.buildRustPackage {
+          pname = "iamb";
+          version = "0.0.7";
+          src = ./.;
+          cargoLock.lockFile = ./Cargo.lock;
+          nativeBuildInputs = [ pkgs.openssl pkgs.pkgconfig ];
+          buildInputs = [ pkgs.openssl ];
+        };
+        devShell = mkShell {
+          buildInputs = [
+            (rustNightly.override { extensions = [ "rust-src" ]; })
+            pkg-config
+            cargo-tarpaulin
+            rust-analyzer
+            rustfmt
+          ];
+        };
+      });
+}