feat: add flake

.gitignore

@@ -30,6 +30,9 @@ target
 # Temporary data folder
 tmp
 
+# Nix build output symlink
+result
+
 .DS_Store
 
 # Generated C headers (produced by `make` in examples/c-ffi; do not commit)

flake.lock

@@ -0,0 +1,48 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1775710090,
+        "narHash": "sha256-ar3rofg+awPB8QXDaFJhJ2jJhu+KqN/PRCXeyuXR76E=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "4c1018dae018162ec878d42fec712642d214fdfa",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1775877051,
+        "narHash": "sha256-wpSQm2PD/w4uRo2wb8utk0b5hOBkkg/CZ1xICY+qB7M=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "08b4f3633471874c8894632ade1b78d75dbda002",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,91 @@
+{
+  description = "libchat - Logos Chat cryptographic library";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = { self, nixpkgs, rust-overlay }:
+    let
+      systems = [ "aarch64-darwin" "x86_64-darwin" "aarch64-linux" "x86_64-linux" ];
+      forAllSystems = f: nixpkgs.lib.genAttrs systems (system: f {
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ rust-overlay.overlays.default ];
+        };
+      });
+    in
+    {
+      packages = forAllSystems ({ pkgs }:
+        let
+          rustToolchain = pkgs.rust-bin.fromRustupToolchainFile ./rust_toolchain.toml;
+          rustPlatform = pkgs.makeRustPlatform {
+            cargo = rustToolchain;
+            rustc = rustToolchain;
+          };
+        in
+        {
+          default = rustPlatform.buildRustPackage {
+            pname = "libchat";
+            version = "0.1.0";
+            src = pkgs.lib.cleanSourceWith {
+              src = ./.;
+              filter = path: type:
+                let base = builtins.baseNameOf path;
+                in !(builtins.elem base [ "target" "nim-bindings" ".git" ".github" "tmp" ]);
+            };
+
+            cargoLock = {
+              lockFile = ./Cargo.lock;
+              outputHashes = {
+                "chat-proto-0.1.0" = "sha256-aCl80VOIkd/GK3gnmRuFoSAvPBfeE/FKCaNlLt5AbUU=";
+              };
+            };
+
+            nativeBuildInputs = [ pkgs.perl pkgs.pkg-config pkgs.cmake ];
+            buildType = "release";
+            # Override panic=abort from workspace Cargo.toml — incompatible with buildRustPackage
+            CARGO_PROFILE_RELEASE_PANIC = "unwind";
+            # Tests run in CI; some require network access unavailable in the Nix sandbox
+            doCheck = false;
+
+            postBuild = ''
+              cargo run --frozen --release --bin generate-headers --features headers -p client-ffi -- crates/client-ffi/client_ffi.h
+            '';
+
+            installPhase = ''
+              runHook preInstall
+              mkdir -p $out/lib $out/include
+              cp target/${pkgs.stdenv.hostPlatform.rust.rustcTarget}/release/libclient_ffi.a $out/lib/
+              cp crates/client-ffi/client_ffi.h $out/include/
+              runHook postInstall
+            '';
+
+            meta = with pkgs.lib; {
+              description = "Logos Chat library (C FFI)";
+              platforms = platforms.unix;
+            };
+          };
+        }
+      );
+
+      devShells = forAllSystems ({ pkgs }:
+        let
+          rustToolchain = pkgs.rust-bin.fromRustupToolchainFile ./rust_toolchain.toml;
+        in
+        {
+          default = pkgs.mkShell {
+            nativeBuildInputs = [
+              rustToolchain
+              pkgs.pkg-config
+              pkgs.cmake
+            ];
+          };
+        }
+      );
+    };
+}