enable development using nix

Signed-off-by: Falk Werner <falk.werner@gmx.net>

.envrc

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

.gitignore

@@ -1,4 +1,5 @@
 /build/
 /out/
 /.vscode/
+/.direnv/
 *.pem

flake.lock

@@ -0,0 +1,25 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1739866667,
+        "narHash": "sha256-EO1ygNKZlsAC9avfcwHkKGMsmipUk1Uc0TbrEZpkn64=",
+        "rev": "73cf49b8ad837ade2de76f87eb53fc85ed5d4680",
+        "revCount": 755230,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.1.755230%2Brev-73cf49b8ad837ade2de76f87eb53fc85ed5d4680/01951ca9-35fa-70f2-b972-630b0cd93c65/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 +1,35 @@
+{
+  description = "A Nix-flake-based C/C++ development environment";
+
+  inputs.nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/0.1.*.tar.gz";
+
+  outputs = { self, nixpkgs }:
+    let
+      supportedSystems = [ "x86_64-linux" ];
+      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
+        pkgs = import nixpkgs { inherit system; };
+      });
+    in
+    {
+      devShells = forEachSupportedSystem ({ pkgs }: {
+        default = pkgs.mkShell.override
+          {
+            # Override stdenv in order to change compiler:
+            # stdenv = pkgs.clangStdenv;
+          }
+          {
+            packages = with pkgs; [
+              pkg-config
+              cmake              
+              gtest
+              valgrind
+              gdb
+              clang-tools
+              openssl
+              fuse3
+              libwebsockets
+            ];
+          };
+      });
+    };
+}