chore(nix): flake (#206)

Closes #205

.github/workflows/release.yaml

@@ -22,6 +22,8 @@ jobs:
         with:
           release-type: elixir
           package-name: next_ls
+          extra-files: |
+            flake.nix
 
       # - uses: actions/checkout@v3
       #   if: ${{ steps.release.outputs.release_created }}

.gitignore

@@ -25,6 +25,7 @@ next_ls-*.tar
 # Temporary files, for example, from tests.
 /tmp/
 burrito_out
+result
 
 # Ignore dialyzer plt files
 /priv/plts/*.plt

flake.nix

@@ -0,0 +1,102 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      # Systems supported
+      allSystems = [
+        "x86_64-linux" # 64-bit Intel/AMD Linux
+        "aarch64-linux" # 64-bit ARM Linux
+        "x86_64-darwin" # 64-bit Intel macOS
+        "aarch64-darwin" # 64-bit ARM macOS
+      ];
+
+      pname = "next-ls";
+      version = "0.10.4"; # x-release-please-version
+      src = ./.;
+
+      # Helper to provide system-specific attributes
+      forAllSystems = f: nixpkgs.lib.genAttrs allSystems (system: f {
+        pkgs = import nixpkgs { inherit system; };
+        system = system;
+      });
+
+      burritoExe = system:
+          if system == "aarch64-darwin" then
+            "darwin_arm64"
+          else if system == "x86_64-darwin" then
+            "darwin_amd64"
+          else if system == "x86_64-linux" then
+            "linux_amd64"
+          else if system == "aarch64-linux" then
+            "linux_arm64"
+          else
+            "";
+    in
+    {
+      packages = forAllSystems ({ pkgs, system }:
+        let
+          beamPackages = pkgs.beam.packages.erlang_26;
+          build = type: beamPackages.mixRelease {
+            inherit pname version src;
+            erlang = beamPackages.erlang;
+            elixir = beamPackages.elixir_1_15;
+
+            nativeBuildInputs = [ pkgs.xz pkgs.zig_0_10 pkgs._7zz ];
+
+            mixFodDeps = beamPackages.fetchMixDeps {
+              inherit src version;
+              pname = "${pname}-deps";
+              hash = "sha256-wweJ9+YuI+2ZdrWDgnMplAE7e538m1YoYRu8wKEPltQ=";
+            };
+
+            preConfigure = ''
+              bindir="$(pwd)/bin"
+              mkdir -p "$bindir"
+              echo '#!/usr/bin/env bash
+              7zz "$@"' > "$bindir/7z"
+              chmod +x "$bindir/7z"
+
+              export HOME="$(pwd)"
+              export PATH="$bindir:$PATH"
+            '';
+
+            preInstall = if type == "local" then ''
+              export BURRITO_TARGET="${burritoExe(system)}"
+            ''
+            else "";
+
+            postInstall = ''
+              cp -r ./burrito_out "$out"
+            '';
+          };
+        in
+        {
+          default = build("local");
+          ci = build("ci");
+        });
+
+      apps = forAllSystems ({ pkgs, system }: {
+        default = {
+          type = "app";
+          program = "${self.packages.${system}.default}/burrito_out/next_ls_${burritoExe(system)}";
+        };
+      });
+
+      devShells = forAllSystems ({ pkgs, ... }:
+        let
+          beamPackages = pkgs.beam.packages.erlang_26;
+        in
+        {
+          default = pkgs.mkShell {
+            # The Nix packages provided in the environment
+            packages = [
+              beamPackages.erlang
+              beamPackages.elixir_1_15
+            ];
+          };
+        });
+    };
+}