Add flake.nix.

flake.lock

@@ -0,0 +1,111 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1644229661,
+        "narHash": "sha256-1YdnJAsNy69bpcjuoKdOYQX0YxZBiCYZo4Twxerqv7k=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "3cecb5b042f7f209c56ffd8371b2711a290ec797",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "foundry": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1733217107,
+        "narHash": "sha256-T5rE+F85pRWkG7efabISw7ZNLgCBhnAg6egu5uGT4Bg=",
+        "owner": "shazow",
+        "repo": "foundry.nix",
+        "rev": "b0534fca03a058756b4a405aacd5f5059a879673",
+        "type": "github"
+      },
+      "original": {
+        "owner": "shazow",
+        "ref": "monthly",
+        "repo": "foundry.nix",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1666753130,
+        "narHash": "sha256-Wff1dGPFSneXJLI2c0kkdWTgxnQ416KE6X4KnFkgPYQ=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "f540aeda6f677354f1e7144ab04352f61aaa0118",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1734435836,
+        "narHash": "sha256-kMBQ5PRiFLagltK0sH+08aiNt3zGERC2297iB6vrvlU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "4989a246d7a390a859852baddb1013f825435cee",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "foundry": "foundry",
+        "nixpkgs": "nixpkgs_2",
+        "utils": "utils"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "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"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,34 @@
+# flake.nix
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    utils.url = "github:numtide/flake-utils";
+    foundry.url = "github:shazow/foundry.nix/monthly"; # Use monthly branch for permanent releases
+  };
+
+  outputs = { self, nixpkgs, utils, foundry }:
+    utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [ foundry.overlay ];
+        };
+      in {
+
+        devShell = with pkgs; mkShell {
+          buildInputs = [
+            # From the foundry overlay
+            # Note: Can also be referenced without overlaying as: foundry.defaultPackage.${system}
+            foundry-bin
+
+            # ... any other dependencies we need
+            solc
+          ];
+
+          # Decorative prompt override so we know when we're in a dev shell
+          shellHook = ''
+            export PS1="[dev] $PS1"
+          '';
+        };
+      });
+}