feat: add flake.nix

.direnv/bin/nix-direnv-reload

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -e
+if [[ ! -d "/home/xeon0x/Projects/ClientServer" ]]; then
+  echo "Cannot find source directory; Did you move it?"
+  echo "(Looking for "/home/xeon0x/Projects/ClientServer")"
+  echo 'Cannot force reload with this script - use "direnv reload" manually and then try again'
+  exit 1
+fi
+
+# rebuild the cache forcefully
+_nix_direnv_force_reload=1 direnv exec "/home/xeon0x/Projects/ClientServer" true
+
+# Update the mtime for .envrc.
+# This will cause direnv to reload again - but without re-building.
+touch "/home/xeon0x/Projects/ClientServer/.envrc"
+
+# Also update the timestamp of whatever profile_rc we have.
+# This makes sure that we know we are up to date.
+touch -r "/home/xeon0x/Projects/ClientServer/.envrc" "/home/xeon0x/Projects/ClientServer/.direnv"/*.rc

.direnv/flake-inputs/64wh73gawgn91x4mdp92dxazdy2v0v05-source

@@ -0,0 +1 @@
+/nix/store/64wh73gawgn91x4mdp92dxazdy2v0v05-source

.direnv/flake-inputs/s1fbk6a410xn8vcaj54iqv22agyn0ria-source

@@ -0,0 +1 @@
+/nix/store/s1fbk6a410xn8vcaj54iqv22agyn0ria-source

.direnv/flake-profile-a5d5b61aa8a61b7d9d765e1daf971a9a578f1cfa

@@ -0,0 +1 @@
+/nix/store/n7xw4vhgmr3is6kljqb8g8z37gg9339m-nix-shell-env

.envrc

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

flake.lock

@@ -0,0 +1,25 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1739736696,
+        "narHash": "sha256-zON2GNBkzsIyALlOCFiEBcIjI4w38GYOb+P+R4S8Jsw=",
+        "rev": "d74a2335ac9c133d6bbec9fc98d91a77f1604c1f",
+        "revCount": 754461,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.754461%2Brev-d74a2335ac9c133d6bbec9fc98d91a77f1604c1f/01951426-5a87-7b75-8413-1a0d9ec5ff04/source.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/0.1.%2A.tar.gz"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,51 @@
+{
+  description = "A Nix-flake-based Java development environment";
+
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+
+  outputs = { self, nixpkgs }:
+    let
+      javaVersion = 21; # Change this value to update the whole stack
+
+      supportedSystems = [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
+        pkgs = import nixpkgs { inherit system; overlays = [ self.overlays.default ]; };
+      });
+    in
+    {
+      overlays.default =
+        final: prev:
+        let
+          jdk = prev."jdk${toString javaVersion}";
+        in
+        {
+          inherit jdk;
+          maven = prev.maven.override { jdk_headless = jdk; };
+          gradle = prev.gradle.override { java = jdk; };
+          lombok = prev.lombok.override { inherit jdk; };
+        };
+
+      devShells = forEachSupportedSystem ({ pkgs }: {
+        default = pkgs.mkShell {
+          packages = with pkgs; [
+            gcc
+            gradle
+            jdk
+            maven
+            ncurses
+            patchelf
+            zlib
+          ];
+
+          shellHook =
+            let
+              loadLombok = "-javaagent:${pkgs.lombok}/share/java/lombok.jar";
+              prev = "\${JAVA_TOOL_OPTIONS:+ $JAVA_TOOL_OPTIONS}";
+            in
+            ''
+              export JAVA_TOOL_OPTIONS="${loadLombok}${prev}"
+            '';
+        };
+      });
+    };
+}