Adding nix flake (#547)

* adding flake

* fix README

* README: fix grammar

* README: add nix profile example

* README: make linter happy

* README: remove multiple blank lines

* Update README.md

Co-authored-by: Pavel Ivanov <[email protected]>

* Update README.md

Co-authored-by: Pavel Ivanov <[email protected]>

* READMDE: align nix-flake section

---------

Co-authored-by: Pavel Ivanov <[email protected]>

.envrc

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

.gitignore

@@ -5,3 +5,6 @@
 /*.log.xz
 /*.log.zst
 /target
+
+# devenv
+.direnv

README.md

@@ -65,6 +65,51 @@ High performance and convenient features are the main goals.
     cargo install --locked --git https://github.com/pamburus/hl.git
     ```
 
+* Run using [nix](https://nixos.org/download/)
+
+  ```sh
+  nix run github:pamburus/hl
+  ```
+
+  or install with [nix profile](https://nix.dev/manual/nix/2.22/command-ref/new-cli/nix3-profile-install):
+
+  ```sh
+  nix profile install github:pamburus/hl
+  ```
+
+* Install the package using [nix-flakes](https://wiki.nixos.org/wiki/Flakes)
+
+  <details>
+  <summary>Example how to update nix configuration</summary>
+
+  ```nix
+  {
+      inputs = {
+          nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+          hl.url = "github:pamburus/hl";
+      };
+      outputs = {nixpkgs, hl, ...}:
+      let
+          system = "x86_64-linux";
+      in
+      {
+          # this is just an example!
+          nixosConfigurations.yourHost = nixpkgs.lib.nixosSystem {
+              inherit system;
+              modules = [
+                  ({...}: {
+                    environment.systemPackages = [
+                      hl.packages.${system}
+                    ];
+                  })
+              ];
+          };
+      };
+  }
+  ```
+
+  </details>
+
 * Download latest release from [download page](https://github.com/pamburus/hl/releases/latest)
 
 ## Examples

flake.nix

@@ -0,0 +1,32 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+  };
+
+  outputs = inputs@{ flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; }
+      {
+        systems = [
+          "x86_64-linux"
+          "aarch64-linux"
+          "x86_64-darwin"
+          "aarch64-darwin"
+        ];
+
+        perSystem = { self', lib, system, pkgs, config, ... }: {
+          _module.args.pkgs = import inputs.nixpkgs {
+            inherit system;
+
+            overlays = with inputs; [
+              rust-overlay.overlays.default
+            ];
+          };
+
+          packages.default = pkgs.callPackage ./nix/package.nix { };
+
+          devShells.default = self'.packages.default;
+        };
+      };
+}

nix/package.nix

@@ -0,0 +1,30 @@
+{ lib
+, rustPlatform
+,
+}:
+let
+  cargoToml = builtins.fromTOML (builtins.readFile ../Cargo.toml);
+in
+rustPlatform.buildRustPackage {
+  pname = cargoToml.package.name;
+  version = cargoToml.workspace.package.version;
+
+  src = builtins.path {
+    path = ../.;
+  };
+
+  cargoLock = {
+    lockFile = ../Cargo.lock;
+    outputHashes = {
+      "htp-0.4.2" = "sha256-oYLN0aCLIeTST+Ib6OgWqEgu9qyI0n5BDtIUIIThLiQ=";
+      "wildflower-0.3.0" = "sha256-vv+ppiCrtEkCWab53eutfjHKrHZj+BEAprV5by8plzE=";
+    };
+  };
+
+  meta = {
+    description = cargoToml.package.description;
+    homepage = cargoToml.workspace.package.repository;
+    license = lib.licenses.mit;
+    mainProgram = cargoToml.package.name;
+  };
+}