init

flake.nix

@@ -0,0 +1,58 @@
+{
+  description = "Description for the project";
+
+  inputs = {
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.11";
+    devshell.url = "github:numtide/devshell";
+  };
+
+  outputs =
+    inputs@{
+      flake-parts,
+      nixpkgs,
+      ...
+    }:
+
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      imports = [
+        inputs.devshell.flakeModule
+      ];
+      systems = nixpkgs.lib.systems.flakeExposed;
+      perSystem =
+        {
+          self',
+          pkgs,
+          system,
+          lib,
+          ...
+        }:
+        {
+          packages.parser = pkgs.stdenv.mkDerivation {
+            pname = "feng parser";
+            version = "1.0";
+            src = ./grammar;
+            buildInputs = with pkgs; [
+              clang
+              peg
+            ];
+            buildPhase = ''
+              peg -o peg.c grammar.peg
+              clang parser.c -o parser
+            '';
+
+            installPhase = ''
+              mkdir -p $out/bin
+              install parser $out/bin/parser
+            '';
+          };
+          devShells.default = pkgs.mkShell {
+            buildInputs = [
+              self'.packages.parser
+            ];
+          };
+        };
+      flake = {
+      };
+    };
+}