nix: add flake

flake.lock

@@ -0,0 +1,43 @@
+{
+  "nodes": {
+    "futils": {
+      "locked": {
+        "lastModified": 1614513358,
+        "narHash": "sha256-LakhOx3S1dRjnh0b5Dg3mbZyH0ToC9I8Y2wKSkBaTzU=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5466c5bbece17adaab2d82fae80b46e807611bf3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1614815769,
+        "narHash": "sha256-Rdy37Ioof5FlMlc+YC9PniSIJW/EsdImG+wZPP5VWvo=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "d496205cf22c3079461d868ea3198d42ded59287",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "futils": "futils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,25 @@
+{
+  description = "Ambroisie's random scripts";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    futils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, futils } @ inputs:
+    futils.lib.eachSystem futils.lib.allSystems (system:
+      let
+        inherit (nixpkgs) lib;
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      {
+        devShell = pkgs.mkShell {
+          name = "scripts";
+          buildInputs = with pkgs; [
+            gitAndTools.pre-commit
+            shellcheck
+          ];
+        };
+      }
+    );
+}