flake for rust

flake.nix

@@ -0,0 +1,49 @@
+{
+  description = "Komp AC - Kompress Accounting";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            mermaid-cli
+            # Rust toolchain
+            rustc
+            cargo
+            rustfmt
+            clippy
+            cargo-watch
+	    rust-analyzer
+	    cargo-tarpaulin
+	    cargo-flamegraph
+	    rust-code-analysis
+
+            # C build tools (for your linker issue)
+            gcc
+            binutils
+            pkg-config
+            
+            # OpenSSL for crypto dependencies
+            openssl
+            openssl.dev
+          ];
+
+          shellHook = ''
+            export PKG_CONFIG_PATH="${pkgs.openssl.dev}/lib/pkgconfig:$PKG_CONFIG_PATH"
+            export OPENSSL_DIR="${pkgs.openssl.dev}"
+            export OPENSSL_LIB_DIR="${pkgs.openssl.out}/lib"
+            export OPENSSL_INCLUDE_DIR="${pkgs.openssl.dev}/include"
+            echo "🦀 Rust development environment loaded"
+          '';
+        };
+      }
+    );
+}