style(treewide): Switch to nixfmt

nix/checks/default.nix

@@ -1,9 +1,8 @@
+{ pkgs, self }:
+let
+  callPackage = pkgs.lib.callPackageWith (pkgs // { inherit self; });
+in
 {
-  pkgs,
-  self,
-}: let
-  callPackage = pkgs.lib.callPackageWith (pkgs // {inherit self;});
-in {
-  lintNix = callPackage ./lint-nix.nix {};
-  openHomepage = callPackage ./open-homepage.nix {};
+  lintNix = callPackage ./lint-nix.nix { };
+  openHomepage = callPackage ./open-homepage.nix { };
 }

nix/checks/lint-nix.nix

@@ -2,26 +2,31 @@
   self,
   lib,
   stdenv,
-  alejandra,
+  nixfmt-rfc-style,
   deadnix,
   statix,
-}: let
+}:
+let
   inherit (lib) sourceFilesBySuffices;
 in
-  stdenv.mkDerivation {
-    dontPatch = true;
-    dontConfigure = true;
-    dontBuild = true;
-    dontInstall = true;
-    doCheck = true;
+stdenv.mkDerivation {
+  dontPatch = true;
+  dontConfigure = true;
+  dontBuild = true;
+  dontInstall = true;
+  doCheck = true;
 
-    name = "lint-nix";
-    src = sourceFilesBySuffices self [".nix"];
-    checkInputs = [alejandra deadnix statix];
-    checkPhase = ''
-      mkdir -p $out
-      alejandra --check . | tee $out/alejandra.log
-      deadnix --fail | tee $out/deadnix.log
-      statix check | tee $out/statix.log
-    '';
-  }
+  name = "lint-nix";
+  src = sourceFilesBySuffices self [ ".nix" ];
+  checkInputs = [
+    nixfmt-rfc-style
+    deadnix
+    statix
+  ];
+  checkPhase = ''
+    mkdir -p $out
+    nixfmt --strict --check . | tee $out/nixfmt.log
+    deadnix --fail | tee $out/deadnix.log
+    statix check | tee $out/statix.log
+  '';
+}

nix/checks/open-homepage.nix

@@ -1,19 +1,16 @@
-{
-  self,
-  nixosTest,
-}:
+{ self, nixosTest }:
 nixosTest {
   name = "open-homepage";
 
   nodes = {
     # Host with just the default configuration
     defaults = {
-      imports = [self.nixosModules.default];
+      imports = [ self.nixosModules.default ];
       services.tlaternet-webserver.enable = true;
     };
 
     host = {
-      imports = [self.nixosModules.default];
+      imports = [ self.nixosModules.default ];
 
       services.tlaternet-webserver = {
         enable = true;
@@ -23,10 +20,10 @@ nixosTest {
         };
       };
 
-      networking.firewall.allowedTCPPorts = [8080];
+      networking.firewall.allowedTCPPorts = [ 8080 ];
     };
 
-    client = {};
+    client = { };
   };
 
   testScript = ''