build(nix): add a Nix flake providing the dev shell and formatters

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

1 files changed, 72 insertions, 0 deletions

diff --git a/flake.nix b/flake.nix
new file mode 100644
index 00000000..57955bc2
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,72 @@
+{
+  description = "Port of Composer, the dependency manager for PHP, written in Rust";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+    systems.url = "github:nix-systems/x86_64-linux";
+
+    flake-utils = {
+      url = "github:numtide/flake-utils";
+      inputs.systems.follows = "systems";
+    };
+
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    treefmt-nix = {
+      url = "github:numtide/treefmt-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs =
+    {
+      nixpkgs,
+      flake-utils,
+      rust-overlay,
+      treefmt-nix,
+      ...
+    }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ rust-overlay.overlays.default ];
+        };
+        rustToolchain = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+        treefmt = treefmt-nix.lib.evalModule pkgs {
+          imports = [ ./treefmt.nix ];
+          programs.rustfmt.package = rustToolchain;
+        };
+      in
+      {
+        formatter = treefmt.config.build.wrapper;
+
+        devShells.default = pkgs.mkShell {
+          packages = [
+            rustToolchain
+            pkgs.php85
+
+            # The following softwares are used for testing.
+            # VCSs
+            pkgs.fossil
+            pkgs.git
+            pkgs.mercurial
+            pkgs.subversion
+            # Archivers
+            pkgs.bzip2
+            pkgs.gnutar
+            pkgs.gzip
+            pkgs.p7zip
+            pkgs.unzip
+            pkgs.xz
+            pkgs.zip
+          ];
+        };
+      }
+    );
+}