Added nix check and pre commit hook for formatting (#220)

* Added nix check and pre commit hook for formatting

* Removed nix fmt check from CI

.envrc

@@ -0,0 +1,7 @@
+use_flake() {
+  watch_file flake.nix
+  watch_file flake.lock
+  eval "$(nix print-dev-env --profile "$(direnv_layout_dir)/flake-profile")"
+}
+
+use flake

.github/workflows/check.yml

@@ -12,4 +12,3 @@ jobs:
         with:
           github_access_token: ${{ secrets.GITHUB_TOKEN }}
       - run: nix flake check
-      - run: nix fmt -- -c .

.gitignore

@@ -1,2 +1,3 @@
 .tmp
 result
+.pre-commit-config.yaml

flake.lock

@@ -22,6 +22,22 @@
         "type": "github"
       }
     },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1673956053,
+        "narHash": "sha256-4gtG9iQuiKITOjNQQeQIpoIB6b16fm+504Ch3sNKLd8=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "35bb57c0c8d8b62bbfd284272c928ceb64ddbde9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
     "flake-utils": {
       "locked": {
         "lastModified": 1676283394,
@@ -37,6 +53,42 @@
         "type": "github"
       }
     },
+    "flake-utils_2": {
+      "locked": {
+        "lastModified": 1667395993,
+        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "pre-commit-hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1660459072,
+        "narHash": "sha256-8DFJjXG8zqoONA1vXtgeKXy68KdJL5UaXR8NtVMUbx8=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "a20de23b925fd8264fd7fad6454652e142fd7f73",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1677342105,
@@ -53,6 +105,22 @@
         "type": "github"
       }
     },
+    "nixpkgs-stable": {
+      "locked": {
+        "lastModified": 1673800717,
+        "narHash": "sha256-SFHraUqLSu5cC6IxTprex/nTsI81ZQAtDvlBvGDWfnA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "2f9fd351ec37f5d479556cd48be4ca340da59b8f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-22.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "poetry2nix": {
       "inputs": {
         "flake-utils": [
@@ -78,11 +146,36 @@
         "type": "github"
       }
     },
+    "pre-commit-hooks": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "flake-utils": "flake-utils_2",
+        "gitignore": "gitignore",
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "nixpkgs-stable": "nixpkgs-stable"
+      },
+      "locked": {
+        "lastModified": 1677722096,
+        "narHash": "sha256-7mjVMvCs9InnrRybBfr5ohqcOz+pyEX8m22C1XsDilg=",
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "rev": "61a3511668891c68ebd19d40122150b98dc2fe3b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "beautysh": "beautysh",
         "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "pre-commit-hooks": "pre-commit-hooks"
       }
     },
     "utils": {

flake.nix

@@ -7,10 +7,14 @@
   inputs.beautysh.url = "github:lovesegfault/beautysh";
   inputs.beautysh.inputs.nixpkgs.follows = "nixpkgs";
 
+  inputs.pre-commit-hooks.url = "github:cachix/pre-commit-hooks.nix";
+  inputs.pre-commit-hooks.inputs.nixpkgs.follows = "nixpkgs";
+
   outputs = {
     self,
     nixpkgs,
     flake-utils,
+    pre-commit-hooks,
     ...
   } @ inputs:
     with nixpkgs.lib;
@@ -62,9 +66,23 @@
             };
           extractRustAnalyzerPkg = pkgs.callPackage extractRustAnalyzer {};
         in {
-          checks = import ./tests/checks.nix {
-            inherit pkgs;
-            makeNixvim = self.legacyPackages."${system}".makeNixvim;
+          checks =
+            (import ./tests/checks.nix {
+              inherit pkgs;
+              makeNixvim = self.legacyPackages."${system}".makeNixvim;
+            })
+            // {
+              pre-commit-check = pre-commit-hooks.lib.${system}.run {
+                src = ./.;
+                hooks = {
+                  alejandra.enable = true;
+                };
+              };
+            };
+          devShells = {
+            default = pkgs.mkShell {
+              inherit (self.checks.${system}.pre-commit-check) shellHook;
+            };
           };
           packages = {
             docs = pkgs.callPackage (import ./docs.nix) {