Add formatter to project.

flake.lock

@@ -1,5 +1,28 @@
 {
   "nodes": {
+    "alejandra": {
+      "inputs": {
+        "fenix": "fenix",
+        "flakeCompat": "flakeCompat",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1660510326,
+        "narHash": "sha256-xFumnivtVwu5fFBOrTxrv6fv3geHKF04RGP23EsDVaI=",
+        "owner": "kamadorueda",
+        "repo": "alejandra",
+        "rev": "ef03f7ef74ec97fd91a016a51c9c9667fb315652",
+        "type": "github"
+      },
+      "original": {
+        "owner": "kamadorueda",
+        "ref": "3.0.0",
+        "repo": "alejandra",
+        "type": "github"
+      }
+    },
     "blobs": {
       "flake": false,
       "locked": {
@@ -16,6 +39,28 @@
         "type": "gitlab"
       }
     },
+    "fenix": {
+      "inputs": {
+        "nixpkgs": [
+          "alejandra",
+          "nixpkgs"
+        ],
+        "rust-analyzer-src": "rust-analyzer-src"
+      },
+      "locked": {
+        "lastModified": 1657607339,
+        "narHash": "sha256-HaqoAwlbVVZH2n4P3jN2FFPMpVuhxDy1poNOR7kzODc=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "b814c83d9e6aa5a28d0cf356ecfdafb2505ad37d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
     "flake-compat": {
       "flake": false,
       "locked": {
@@ -32,6 +77,22 @@
         "type": "github"
       }
     },
+    "flakeCompat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1650374568,
+        "narHash": "sha256-Z+s0J8/r907g149rllvwhb4pKi8Wam5ij0st8PwAh+E=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "b4a34015c698c7793d592d66adbab377907a2be8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
     "mailserver": {
       "inputs": {
         "blobs": "blobs",
@@ -181,6 +242,7 @@
     },
     "root": {
       "inputs": {
+        "alejandra": "alejandra",
         "mailserver": "mailserver",
         "nixpkgs": "nixpkgs_2",
         "nixpkgs-git": "nixpkgs-git",
@@ -189,6 +251,23 @@
         "sops-nix": "sops-nix"
       }
     },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1657557289,
+        "narHash": "sha256-PRW+nUwuqNTRAEa83SfX+7g+g8nQ+2MMbasQ9nt6+UM=",
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "caf23f29144b371035b864a1017dbc32573ad56d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
+    },
     "sops-nix": {
       "inputs": {
         "nixpkgs": [

flake.nix

@@ -5,15 +5,20 @@
     nixpkgs-stable.url = "github:/NixOS/nixpkgs/nixos-22.11";
     nixpkgs-unstable.url = "github:/NixOS/nixpkgs/nixos-unstable";
     nixpkgs.url = "github:/NixOS/nixpkgs/nixos-unstable";
+    alejandra = {
+      url = github:kamadorueda/alejandra/3.0.0;
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
     mailserver.url = "gitlab:/simple-nixos-mailserver/nixos-mailserver";
     sops-nix = {
       url = github:Mic92/sops-nix;
       inputs.nixpkgs.follows = "nixpkgs";
     };
   };
-  outputs = { self, nixpkgs, sops-nix, mailserver, ... }@attrs: let
+  outputs = { self, nixpkgs, alejandra, mailserver, sops-nix, ... }@attrs: let
     lib = nixpkgs.lib;
     fn = import ./fn.nix { inherit lib; };
+    mappedFormatter = builtins.mapAttrs (arch: packages: packages.default) alejandra.packages;
     system = "x86_64-linux";
     machineList = fn.lst { p = (toString ./machines); t = "directory"; b = false; };
     configFiles = fn.lst { p = (toString ./config); b = true; };
@@ -37,6 +42,7 @@
       };
     };
   in {
+    formatter = mappedFormatter;
     nixosConfigurations = lib.listToAttrs (map nixosSystemFor machineList);
   };
 }