Initial commit

.envrc

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+watch_file flake.nix flake.lock *.nix **/*.nix
+
+eval "$(nix print-dev-env)"

.gitignore

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+/result*

checks/default.nix

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+{ pkgs }:
+
+{
+  nixpkgs-fmt = pkgs.callPackage ./nixpkgs-fmt.nix { };
+}

checks/nixpkgs-fmt.nix

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+{ lib
+, nixpkgs-fmt
+, runCommand
+}:
+
+let
+  cleaned = lib.cleanSource ./..;
+  nixOnly = lib.sourceFilesBySuffices cleaned [ ".nix" ];
+in
+runCommand "nixpkgs-fmt"
+{
+  nativeBuildInputs = [ nixpkgs-fmt ];
+} ''
+  nixpkgs-fmt --check ${nixOnly}
+  touch $out # it worked!
+''

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1640269308,
+        "narHash": "sha256-vBVwv3+kPrxbNyfo48cB5cc5/4tq5zlJGas/qw8XNBE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "0c408a087b4751c887e463e3848512c12017be25",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "utils": "utils"
+      }
+    },
+    "utils": {
+      "locked": {
+        "lastModified": 1638122382,
+        "narHash": "sha256-sQzZzAbvKEqN9s0bzWuYmRaA03v40gaJ4+iL1LXjaeI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "74f7e4319258e287b0f9cb95426c9853b282730b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    utils = {
+      url = "github:numtide/flake-utils";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = inputs@{ self, nixpkgs, utils, ... }: utils.lib.eachDefaultSystem (system:
+    let
+      pkgs = import nixpkgs {
+        inherit system;
+      };
+
+      lib = import ./lib {
+        inherit pkgs;
+      };
+
+      checks = import ./checks {
+        inherit pkgs;
+      };
+    in
+    {
+      inherit checks lib;
+
+      devShell = pkgs.mkShell {
+        inputsFrom = builtins.attrValues checks;
+      };
+    });
+}

lib/default.nix

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+{ pkgs }:
+
+{ }