build(nix): adding the flake for nix

.envrc

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

.gitignore

@@ -1,5 +1,9 @@
 .clangd
+.direnv/
+.DS_Store
 build/
+flake.lock
+
 *.pdf
 *.d
 *.o
@@ -8,8 +12,8 @@ build/
 *_shrubbery
 *.csv
 *.tgz
+
 phonebook
-.DS_Store
 megaphone
 job_of_dream
 BraiiiiiiinnnzzzZ

flake.lock

@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1746328495,
+        "narHash": "sha256-uKCfuDs7ZM3QpCE/jnfubTg459CnKnJG/LwqEVEdEiw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "979daf34c8cacebcd917d540070b52a3c2b9b16e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,28 @@
+{
+	description = "Shell for 42 cpp";
+
+	inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+	inputs.flake-utils.url = "github:numtide/flake-utils";
+
+	outputs = { self, nixpkgs, flake-utils }:
+		flake-utils.lib.eachDefaultSystem (system:
+			let
+				pkgs = import nixpkgs {
+					inherit system;
+				};
+			in {
+				devShells.default = pkgs.mkShell {
+					name = "cpp-42";
+					buildInputs = with pkgs; [
+						clang
+						clang-tools
+					];
+					
+					shellHook = ''
+						export CXX=clang++
+						export CC=clang
+					'';
+					};
+				}
+		);
+}