configs/nixos/guests/copyparty.nix

@@ -109,12 +109,16 @@ in
           inherit (cfg.reverseProxy) trustedSources;
         };
         volumes = lib.mapAttrs (_urlPath: volume: {
-          inherit (volume) path access flags readOnly;
+          inherit (volume)
+            path
+            access
+            flags
+            readOnly
+            ;
         }) cfg.volumes;
       };
 
-      mounts =
+      mounts = {
-        {
         ${cfg.stateDir} = {
           directory = cfg.statePath;
           owner = config.registry."stable-uid".${config.networking.hostName}.copyparty;
@@ -126,7 +130,8 @@ in
           readOnly = true;
         };
       }
-        // lib.mapAttrs' (_urlPath: volume:
+      // lib.mapAttrs' (
+        _urlPath: volume:
         lib.nameValuePair volume.path {
           directory = volume.hostPath;
           owner = "root";

configs/nixos/guests/palworld.nix

@@ -88,14 +88,18 @@ in
     guests.palworld = {
       interior.modules.services.games.palworld = {
         enable = true;
-        inherit (cfg) serverName port publicIP autoStart;
+        inherit (cfg)
+          serverName
+          port
+          publicIP
+          autoStart
+          ;
         inherit steamDir installDir stateDir;
         passwordFile = "/run/secrets/${cfg.passwordSecret}";
         adminPasswordFile = "/run/secrets/${cfg.adminPasswordSecret}";
       };
 
-      mounts =
+      mounts = {
-        {
         ${steamDir} = {
           directory = cfg.steamPath;
           owner = config.registry."stable-uid".${config.networking.hostName}.steamcmd;
@@ -133,8 +137,7 @@ in
       };
     };
 
-    sops.secrets =
+    sops.secrets = {
-      {
       ${cfg.passwordSecret} = {
         owner = "root";
         group = "storage";

configs/nixos/hosts/neogaia/default.nix

@@ -34,7 +34,7 @@
 
   registry.shell-shortcut.neogaia = {
     vpn-on = "sudo systemctl start wireguard-wg-home.target";
-    vpn-off = ''sudo systemctl stop 'wireguard-wg-home*.service' wireguard-wg-home.target'';
+    vpn-off = "sudo systemctl stop 'wireguard-wg-home*.service' wireguard-wg-home.target";
   };
 
   modules.monorepo.enable = true;

configs/nixos/hosts/neogaia/disk.nix

@@ -1,4 +1,4 @@
-{ ... }:
+_:
 # neogaia's disk layout for disko: one NVMe disk, GPT, with an EFI system
 # partition and a LUKS container holding btrfs subvolumes.
 # No swap partition, since swap is zram.

configs/nixos/hosts/pikachu/disk.nix

@@ -1,4 +1,4 @@
-{ ... }:
+_:
 # pikachu's install layout for disko: one NVMe boot disk with an EFI system partition and ext4 root.
 # The existing 8 TB ZFS mirror is imported by name and is never declared here.
 {

configs/nixos/hosts/zeus/default.nix

@@ -8,7 +8,10 @@
 # Disk layout is in ./disk.nix.
 # `fileSystems` are derived from it, none declared here.
 {
-  imports = [ ./disk.nix ] ++ lib.optional (builtins.pathExists ./hardware-configuration.nix) ./hardware-configuration.nix;
+  imports = [
+    ./disk.nix
+  ]
+  ++ lib.optional (builtins.pathExists ./hardware-configuration.nix) ./hardware-configuration.nix;
 
   nixpkgs.hostPlatform = "x86_64-linux";
 

configs/nixos/hosts/zeus/disk.nix

@@ -1,4 +1,4 @@
-{ ... }:
+_:
 # zeus's disk layout for disko: two NVMe disks with one EFI system partition
 # and two LUKS containers joined into one btrfs filesystem.
 # No swap partition, since swap is zram.

configs/nixos/modules/desktop/apps/alacritty.nix

@@ -10,7 +10,8 @@ let
   user = config.user.name;
 in
 {
-  options.modules.desktop.apps.alacritty.enable = lib.mkEnableOption "Alacritty as the desktop terminal";
+  options.modules.desktop.apps.alacritty.enable =
+    lib.mkEnableOption "Alacritty as the desktop terminal";
 
   config = lib.mkIf cfg.enable {
     home-manager.users.${user}.home.packages = [ pkgs.alacritty ];

configs/nixos/modules/desktop/apps/obsidian.nix

@@ -10,7 +10,8 @@ let
   user = config.user.name;
 in
 {
-  options.modules.desktop.apps.obsidian.enable = lib.mkEnableOption "Obsidian as the desktop note-taking vault";
+  options.modules.desktop.apps.obsidian.enable =
+    lib.mkEnableOption "Obsidian as the desktop note-taking vault";
 
   config = lib.mkIf cfg.enable {
     home-manager.users.${user}.home.packages = [ pkgs.obsidian ];

configs/nixos/modules/desktop/apps/vencord.nix

@@ -10,7 +10,8 @@ let
   user = config.user.name;
 in
 {
-  options.modules.desktop.apps.vencord.enable = lib.mkEnableOption "Vesktop, a Discord client with Vencord built in";
+  options.modules.desktop.apps.vencord.enable =
+    lib.mkEnableOption "Vesktop, a Discord client with Vencord built in";
 
   config = lib.mkIf cfg.enable {
     home-manager.users.${user}.home.packages = [ pkgs.vesktop ];

configs/nixos/modules/desktop/session/hyprland/default.nix

@@ -67,8 +67,7 @@ in
         # UWSM launches the session without the shell profile that would carry
         # them, so a variable the compositor or its children must see is set
         # here rather than through home-manager's sessionVariables.
-        env =
+        env = [
-          [
           # Chromium and Electron apps read this to select native Wayland;
           # nixpkgs wrappers (Obsidian's included) gate their Wayland flags on
           # it, so without it they run under XWayland and blur at this DPI.

configs/nixos/modules/desktop/session/hyprland/hyprlock.nix

@@ -45,7 +45,8 @@ let
   '';
 in
 {
-  options.modules.desktop.session.hyprland.hyprlock.enable = lib.mkEnableOption "the hyprlock lock screen";
+  options.modules.desktop.session.hyprland.hyprlock.enable =
+    lib.mkEnableOption "the hyprlock lock screen";
 
   config = lib.mkIf cfg.enable {
     home-manager.users.${user} = {

configs/nixos/modules/desktop/session/login.nix

@@ -10,7 +10,8 @@ let
   cfg = config.modules.desktop.session.login;
 in
 {
-  options.modules.desktop.session.login.enable = lib.mkEnableOption "greetd with the tuigreet text greeter";
+  options.modules.desktop.session.login.enable =
+    lib.mkEnableOption "greetd with the tuigreet text greeter";
 
   config = lib.mkIf cfg.enable {
     services.greetd = {

configs/nixos/modules/desktop/utilities/clipboard.nix

@@ -25,7 +25,8 @@ let
   '';
 in
 {
-  options.modules.desktop.utilities.clipboard.enable = lib.mkEnableOption "cliphist clipboard history";
+  options.modules.desktop.utilities.clipboard.enable =
+    lib.mkEnableOption "cliphist clipboard history";
 
   config = lib.mkIf cfg.enable {
     home-manager.users.${user} = {

configs/nixos/modules/desktop/utilities/osd.nix

@@ -10,7 +10,8 @@ let
   user = config.user.name;
 in
 {
-  options.modules.desktop.utilities.osd.enable = lib.mkEnableOption "the SwayOSD volume and brightness popup";
+  options.modules.desktop.utilities.osd.enable =
+    lib.mkEnableOption "the SwayOSD volume and brightness popup";
 
   config = lib.mkIf cfg.enable {
     environment.systemPackages = [ pkgs.swayosd ];

configs/nixos/modules/desktop/utilities/recording.nix

@@ -41,7 +41,8 @@ let
   '';
 in
 {
-  options.modules.desktop.utilities.recording.enable = lib.mkEnableOption "wf-recorder screen recording";
+  options.modules.desktop.utilities.recording.enable =
+    lib.mkEnableOption "wf-recorder screen recording";
 
   config = lib.mkIf cfg.enable {
     home-manager.users.${user} = {

configs/nixos/modules/desktop/utilities/screenshot.nix

@@ -32,7 +32,8 @@ let
     '';
 in
 {
-  options.modules.desktop.utilities.screenshot.enable = lib.mkEnableOption "screenshots via grimblast and satty";
+  options.modules.desktop.utilities.screenshot.enable =
+    lib.mkEnableOption "screenshots via grimblast and satty";
 
   config = lib.mkIf cfg.enable {
     home-manager.users.${user} = {

configs/nixos/modules/host.nix

@@ -5,7 +5,7 @@
 }:
 let
   cfg = config.modules.host;
-  user = config.user;
+  inherit (config) user;
   hostSecrets = ../secrets + "/${config.networking.hostName}.yaml";
   passwordSecret = "${user.name}-password";
 in

configs/nixos/modules/network/ssh.nix

@@ -104,8 +104,7 @@ let
   isWorkstation = elem currentHost cfg.hosts.workstations;
 
   defaultAuthorizedKeys = lib.flatten (
-    clientKeysFor workstationNames
+    clientKeysFor workstationNames ++ optional isServer (clientKeysFor serverNames)
-    ++ optional isServer (clientKeysFor serverNames)
   );
 
   outboundTargetNames =
@@ -120,7 +119,8 @@ let
     in
     filter (name: name != currentHost) (targetNamesIn groupTargets);
 
-  sshSettingsFor = name:
+  sshSettingsFor =
+    name:
     let
       target = cfg.targets.${name};
     in
@@ -131,7 +131,8 @@ let
     }
     // optionalAttrs (target.port != 22) { Port = target.port; };
 
-  knownHostNamesFor = target:
+  knownHostNamesFor =
+    target:
     let
       names = unique (target.aliases ++ [ target.hostName ]);
       withPort = name: if target.port == 22 then name else "[${name}]:${toString target.port}";
@@ -142,7 +143,8 @@ let
     concatLists (
       mapAttrsToList (
         targetName: target:
-        imap0 (i: key:
+        imap0 (
+          i: key:
           nameValuePair "${targetName}-${toString i}" {
             hostNames = knownHostNamesFor target;
             publicKey = keyWithoutComment key;
@@ -290,8 +292,7 @@ in
     };
   };
 
-  config = mkIf cfg.enable (
+  config = mkIf cfg.enable (mkMerge [
-    mkMerge [
     {
       services.openssh.enable = true;
 
@@ -342,6 +343,5 @@ in
       home-manager.users.${user}.programs.ssh.settings."*".IdentityFile =
         config.sops.secrets.${userKeySecret}.path;
     })
-    ]
+  ]);
-  );
 }

configs/nixos/modules/network/vlans.nix

@@ -75,8 +75,9 @@ in
     ];
 
     # networkd owns these interfaces so NetworkManager does not contend for them.
-    networking.networkmanager.unmanaged =
+    networking.networkmanager.unmanaged = [
-      [ "interface-name:${cfg.trunk}" ]
+      "interface-name:${cfg.trunk}"
+    ]
     ++ map (id: "interface-name:${bridgeName id}") cfg.ids
     ++ map (id: "interface-name:${vlanName id}") cfg.ids;
 

configs/nixos/modules/network/vpn-client.nix

@@ -88,16 +88,18 @@ in
 
     networking.wireguard.interfaces.${cfg.interface} = {
       ips = [ cfg.address ];
-      mtu = cfg.mtu;
+      inherit (cfg) mtu;
       privateKeyFile = config.sops.secrets.${cfg.privateKeySecret}.path;
 
       peers = [
-        ({
+        (
+          {
             inherit (cfg.peer) publicKey endpoint allowedIPs;
           }
           // lib.optionalAttrs (cfg.peer.persistentKeepalive != null) {
             inherit (cfg.peer) persistentKeepalive;
-        })
+          }
+        )
       ];
     };
   };

configs/nixos/modules/services/actualbudget.nix

@@ -45,14 +45,14 @@ in
       users.users.${cfg.user} = {
         isSystemUser = true;
         uid = config.registry."stable-uid".${config.networking.hostName}.actualbudget;
-        group = cfg.group;
+        inherit (cfg) group;
       };
 
       services.actual = {
         enable = true;
         openFirewall = true;
-        user = cfg.user;
+        inherit (cfg) user;
-        group = cfg.group;
+        inherit (cfg) group;
         settings = {
           inherit (cfg) port dataDir;
         };

configs/nixos/modules/services/copyparty.nix

@@ -40,13 +40,16 @@ let
 
   renderAccess = permission: accounts: "    ${permission}: ${lib.concatStringsSep ", " accounts}";
 
-  hasFlag = name: flags: lib.any (flag: lib.hasPrefix "${name}:" flag || lib.hasPrefix "${name}=" flag) flags;
+  hasFlag =
+    name: flags: lib.any (flag: lib.hasPrefix "${name}:" flag || lib.hasPrefix "${name}=" flag) flags;
 
-  defaultPermissionFlags = flags:
+  defaultPermissionFlags =
+    flags:
     lib.optionals (!(hasFlag "chmod_d" flags)) [ "chmod_d: 2770" ]
     ++ lib.optionals (!(hasFlag "chmod_f" flags)) [ "chmod_f: 660" ];
 
-  renderFlags = flags: lib.concatMapStringsSep "\n" (flag: "    ${flag}") (flags ++ defaultPermissionFlags flags);
+  renderFlags =
+    flags: lib.concatMapStringsSep "\n" (flag: "    ${flag}") (flags ++ defaultPermissionFlags flags);
 
   renderVolume = urlPath: volume: ''
     [${urlPath}]
@@ -173,7 +176,7 @@ in
       users.users.${cfg.user} = {
         isSystemUser = true;
         uid = config.registry."stable-uid".${config.networking.hostName}.copyparty;
-        group = cfg.group;
+        inherit (cfg) group;
         home = cfg.stateDir;
       };
 
@@ -202,7 +205,10 @@ in
           PrivateTmp = true;
           ProtectSystem = "strict";
           ProtectHome = true;
-          ReadWritePaths = [ cfg.stateDir ] ++ map (volume: volume.path) (lib.filter (volume: !volume.readOnly) (lib.attrValues cfg.volumes));
+          ReadWritePaths = [
+            cfg.stateDir
+          ]
+          ++ map (volume: volume.path) (lib.filter (volume: !volume.readOnly) (lib.attrValues cfg.volumes));
         };
       };
 

configs/nixos/modules/services/games/palworld.nix

@@ -134,8 +134,7 @@
         appId = 2394010;
         inherit (service) autoStart;
         executable = "${startScript}";
-        arguments =
+        arguments = [
-          [
           "-useperfthreads"
           "-NoAsyncLoadingThread"
           "-UseMultithreadForDS"

configs/nixos/modules/services/homepage.nix

@@ -7,7 +7,9 @@
 let
   cfg = config.modules.services.homepage;
 
-  mkRegistryPath = registryName: host: entry: "registry.${registryName}.${host}.${entry}";
+  mkRegistryPath =
+    registryName: host: entry:
+    "registry.${registryName}.${host}.${entry}";
 
   homepageEntries = lib.concatLists (
     lib.mapAttrsToList (
@@ -19,7 +21,8 @@ let
     ) registry.homepage
   );
 
-  mkHref = item:
+  mkHref =
+    item:
     if item.homepage.href != null then
       item.homepage.href
     else if (item.composite.route or null) != null then
@@ -32,7 +35,8 @@ let
     else
       throw "${mkRegistryPath "homepage" item.host item.entry} needs href or a matching route entry";
 
-  mkServiceAttrs = item:
+  mkServiceAttrs =
+    item:
     lib.filterAttrs (_: value: value != null) {
       href = mkHref item;
       inherit (item.homepage) description icon;
@@ -40,11 +44,11 @@ let
 
   sortedEntries = lib.sort (left: right: left.homepage.name < right.homepage.name) homepageEntries;
 
-  insertEntry = acc: item:
+  insertEntry =
+    acc: item:
     acc
     // {
-      ${item.homepage.tab} = (acc.${item.homepage.tab} or { })
+      ${item.homepage.tab} = (acc.${item.homepage.tab} or { }) // {
-        // {
         ${item.homepage.section} = (acc.${item.homepage.tab}.${item.homepage.section} or [ ]) ++ [
           { ${item.homepage.name} = mkServiceAttrs item; }
         ];
@@ -80,13 +84,15 @@ let
     ];
   };
 
-  orderedSections = tab: sections:
+  orderedSections =
+    tab: sections:
     let
       sectionOrder = sectionOrderByTab.${tab} or [ ];
     in
     sectionOrder ++ lib.filter (section: !lib.elem section sectionOrder) (lib.attrNames sections);
 
-  mkTab = tab:
+  mkTab =
+    tab:
     let
       sections = entriesByTab.${tab};
     in
@@ -148,7 +154,9 @@ in
       openFirewall = true;
       inherit (cfg) listenPort;
       environmentFiles = [ cfg.environmentFile ];
-      allowedHosts = lib.concatStringsSep "," (if cfg.allowedHosts == null then derivedAllowedHosts else cfg.allowedHosts);
+      allowedHosts = lib.concatStringsSep "," (
+        if cfg.allowedHosts == null then derivedAllowedHosts else cfg.allowedHosts
+      );
       services = homepageServices;
       widgets = [
         {

configs/nixos/modules/services/navidrome.nix

@@ -50,7 +50,7 @@ in
         user = "navidrome";
         group = "storage";
         openFirewall = true;
-        environmentFile = cfg.environmentFile;
+        inherit (cfg) environmentFile;
         settings = {
           Address = "0.0.0.0";
           Port = 4533;

configs/nixos/modules/services/reverse-proxy.nix

@@ -7,15 +7,20 @@
 let
   cfg = config.modules.services.reverse-proxy;
 
-  mkRegistryPath = registryName: host: entry: "registry.${registryName}.${host}.${entry}";
+  mkRegistryPath =
+    registryName: host: entry:
+    "registry.${registryName}.${host}.${entry}";
 
   mkBackend = address: port: "http://${address}:${toString port}";
 
-  mkVirtualHost = host: entry: mode:
+  mkVirtualHost =
+    host: entry: mode:
     let
       compositeEntry = registry.join host entry;
-      route = compositeEntry.route;
+      inherit (compositeEntry) route;
-      address = compositeEntry.address or (throw "no matching entry in registry.address for ${mkRegistryPath "route" host entry}");
+      address =
+        compositeEntry.address
+          or (throw "no matching entry in registry.address for ${mkRegistryPath "route" host entry}");
       isHttp = mode == "http";
       port = if isHttp then route.http.port else route.port;
     in
@@ -63,7 +68,11 @@ let
       domain: virtualHosts:
       if lib.length virtualHosts > 1 then
         [
-          "duplicate route domain ${domain} in ${lib.concatMapStringsSep " and " (virtualHost: mkRegistryPath virtualHost.registryName virtualHost.host virtualHost.entry) virtualHosts}"
+          "duplicate route domain ${domain} in ${
+            lib.concatMapStringsSep " and " (
+              virtualHost: mkRegistryPath virtualHost.registryName virtualHost.host virtualHost.entry
+            ) virtualHosts
+          }"
         ]
       else
         [ ]
@@ -76,13 +85,21 @@ let
     else
       lib.listToAttrs generatedVirtualHostList;
 
-  mkUdpStream = host: entry: port:
+  mkUdpStream =
+    host: entry: port:
     let
       compositeEntry = registry.join host entry;
-      address = compositeEntry.address or (throw "no matching entry in registry.address for ${mkRegistryPath "route" host entry}");
+      address =
+        compositeEntry.address
+          or (throw "no matching entry in registry.address for ${mkRegistryPath "route" host entry}");
     in
     {
-      inherit host entry port address;
+      inherit
+        host
+        entry
+        port
+        address
+        ;
     };
 
   generatedUdpStreams = lib.concatLists (

configs/nixos/modules/shell/bazel.nix

@@ -10,7 +10,8 @@ let
   user = config.user.name;
 in
 {
-  options.modules.shell.bazel.enable = lib.mkEnableOption "Bazel for the primary user's shell environment";
+  options.modules.shell.bazel.enable =
+    lib.mkEnableOption "Bazel for the primary user's shell environment";
 
   config = lib.mkIf cfg.enable {
     home-manager.users.${user}.home.packages = [ pkgs.bazel ];

configs/nixos/modules/shell/fish/default.nix

@@ -107,8 +107,7 @@ in
 
         # Rendered by home-manager into ~/.config/fish/config.fish.
         interactiveShellInit = lib.concatStringsSep "\n" (
-          (lib.mapAttrsToList exportEnvVar envVars)
+          (lib.mapAttrsToList exportEnvVar envVars) ++ [ (builtins.readFile ./config.fish) ]
-          ++ [ (builtins.readFile ./config.fish) ]
         );
       };
     };

configs/nixos/modules/shell/herdr.nix

@@ -10,7 +10,8 @@ let
   user = config.user.name;
 in
 {
-  options.modules.shell.herdr.enable = lib.mkEnableOption "Herdr, a terminal multiplexer for coding agents";
+  options.modules.shell.herdr.enable =
+    lib.mkEnableOption "Herdr, a terminal multiplexer for coding agents";
 
   config = lib.mkIf cfg.enable {
     registry.shell-shortcut.${config.networking.hostName}.hs = "herdr --session";

configs/nixos/modules/shell/nvim/default.nix

@@ -11,7 +11,8 @@ let
   user = config.user.name;
 in
 {
-  options.modules.shell.nvim.enable = lib.mkEnableOption "Neovim, configured declaratively via nixvim";
+  options.modules.shell.nvim.enable =
+    lib.mkEnableOption "Neovim, configured declaratively via nixvim";
 
   config = lib.mkIf cfg.enable {
     registry.shell-shortcut.${config.networking.hostName} = {

configs/nixos/modules/shell/pi/default.nix

@@ -18,8 +18,7 @@ let
 in
 {
   options.modules.shell.pi = {
-    enable = lib.mkEnableOption ''
+    enable = lib.mkEnableOption "Pi, a terminal coding agent, configured through home-manager";
-      Pi, a terminal coding agent, configured through home-manager'';
   };
 
   config = lib.mkIf cfg.enable {

configs/nixos/modules/shell/python.nix

@@ -10,7 +10,8 @@ let
   user = config.user.name;
 in
 {
-  options.modules.shell.python.enable = lib.mkEnableOption "Python tools for the primary user's shell environment";
+  options.modules.shell.python.enable =
+    lib.mkEnableOption "Python tools for the primary user's shell environment";
 
   config = lib.mkIf cfg.enable {
     registry.env-var.${config.networking.hostName}.PYTHON_TOOLCHAIN_ROOT = "${pkgs.python3}";

configs/nixos/modules/shell/rust.nix

@@ -20,7 +20,8 @@ let
   };
 in
 {
-  options.modules.shell.rust.enable = lib.mkEnableOption "Rust tools for the primary user's shell environment";
+  options.modules.shell.rust.enable =
+    lib.mkEnableOption "Rust tools for the primary user's shell environment";
 
   config = lib.mkIf cfg.enable {
     registry.env-var.${config.networking.hostName}.RUST_TOOLCHAIN_ROOT = "${toolchain}";

configs/nixos/registry/route.nix

@@ -6,14 +6,16 @@
       message = "Route domains must be unique.";
     }
     {
-      assertion = entries:
+      assertion =
+        entries:
         lib.registry.predicates.uniqueValue (entry: entry.value) (
           lib.concatMap (entry: map (port: entry // { value = port; }) entry.value.udp.ports) entries
         );
       message = "Route UDP ports must be unique.";
     }
     {
-      assertion = entries: lib.all (entry: entry.value.port == null || entry.value.http.port == null) entries;
+      assertion =
+        entries: lib.all (entry: entry.value.port == null || entry.value.http.port == null) entries;
       message = "Route entries must not set both port and http.port.";
     }
   ];

configs/nixos/registry/stable-uid.nix

@@ -7,12 +7,14 @@ let
     unique
     ;
 
-  serviceNamesByUid = entries:
+  serviceNamesByUid =
+    entries:
     mapAttrs (_uid: uidEntries: unique (map (entry: entry.entry) uidEntries)) (
       groupBy (entry: toString entry.value) entries
     );
 
-  duplicateUids = entries:
+  duplicateUids =
+    entries:
     filterAttrs (_uid: serviceNames: builtins.length serviceNames > 1) (serviceNamesByUid entries);
 
 in

flake.nix

@@ -78,7 +78,7 @@
     { self, nixpkgs, ... }@inputs:
     import ./src/dotfiles {
       inherit inputs self;
-      lib = nixpkgs.lib;
+      inherit (nixpkgs) lib;
       root = ./configs/nixos;
       system = "x86_64-linux";
     };

src/dotfiles/apps.nix

@@ -10,7 +10,8 @@ in
 {
   fix = {
     type = "app";
-    program = lib.getExe (pkgs.writeShellApplication {
+    program = lib.getExe (
+      pkgs.writeShellApplication {
         name = "fix";
         runtimeInputs = [
           formatter.config.build.wrapper
@@ -23,6 +24,7 @@ in
           deadnix --edit --exclude configs/nixos/hosts/*/hardware-configuration.nix -- .
           treefmt
         '';
-    });
+      }
+    );
   };
 }

src/dotfiles/guests.nix

@@ -17,16 +17,13 @@ let
       directoryMounts = lib.filterAttrs (_: mount: mount.directory != null) cfg.mounts;
 
       directoryScript = lib.concatStringsSep "\n" (
-        lib.mapAttrsToList (
+        lib.mapAttrsToList (_: mount: ''
-          _: mount:
-          ''
           ${config.system.path}/bin/install -d \
             ${lib.optionalString (mount.owner != null) "-o ${lib.escapeShellArg (toString mount.owner)}"} \
             ${lib.optionalString (mount.group != null) "-g ${lib.escapeShellArg mount.group}"} \
             ${lib.optionalString (mount.mode != null) "-m ${lib.escapeShellArg mount.mode}"} \
             ${lib.escapeShellArg mount.directory}
-          ''
+        '') directoryMounts
-        ) directoryMounts
       );
     in
     {
@@ -171,14 +168,20 @@ let
         assertions =
           let
             hasDirectorySettings = mount: mount.owner != null || mount.group != null || mount.mode != null;
-            hasCompleteDirectorySettings = mount: mount.owner != null && mount.group != null && mount.mode != null;
+            hasCompleteDirectorySettings =
+              mount: mount.owner != null && mount.group != null && mount.mode != null;
             hasOneSource = mount: (mount.directory != null) != (mount.file != null);
-            mountsWithInvalidSource = lib.attrNames (lib.filterAttrs (_: mount: !hasOneSource mount) cfg.mounts);
+            mountsWithInvalidSource = lib.attrNames (
+              lib.filterAttrs (_: mount: !hasOneSource mount) cfg.mounts
+            );
             fileMountsWithHostSettings = lib.attrNames (
               lib.filterAttrs (_: mount: mount.file != null && hasDirectorySettings mount) cfg.mounts
             );
             directoryMountsWithPartialHostSettings = lib.attrNames (
-              lib.filterAttrs (_: mount: mount.directory != null && hasDirectorySettings mount && !hasCompleteDirectorySettings mount) cfg.mounts
+              lib.filterAttrs (
+                _: mount:
+                mount.directory != null && hasDirectorySettings mount && !hasCompleteDirectorySettings mount
+              ) cfg.mounts
             );
           in
           [
@@ -203,20 +206,23 @@ let
             {
               assertion = lib.elem cfg.vlan config.modules.network.vlans.ids;
               message = ''
-                guests.${name}.vlan = ${toString cfg.vlan} is not among its host's modules.network.vlans.ids (${lib.concatMapStringsSep ", " toString config.modules.network.vlans.ids}). Declare the VLAN on the host or correct the guest's placement.
+                guests.${name}.vlan = ${toString cfg.vlan} is not among its host's modules.network.vlans.ids (${
+                  lib.concatMapStringsSep ", " toString config.modules.network.vlans.ids
+                }). Declare the VLAN on the host or correct the guest's placement.
               '';
             }
           ];
 
-        registry.address.${config.networking.hostName}.${name} =
+        registry.address.${config.networking.hostName}.${name} = lib.mkIf (cfg.address != null) cfg.address;
-          lib.mkIf (cfg.address != null) cfg.address;
 
         registry.route.${config.networking.hostName}.${name} =
           lib.mkIf cfg.reverseProxy.enable cfg.reverseProxy.route;
 
         systemd.services."container@${name}" =
           let
-            bridgeDevice = "sys-subsystem-net-devices-${lib.replaceStrings [ "-" ] [ "\\x2d" ] (util.bridgeName cfg.vlan)}.device";
+            bridgeDevice = "sys-subsystem-net-devices-${
+              lib.replaceStrings [ "-" ] [ "\\x2d" ] (util.bridgeName cfg.vlan)
+            }.device";
           in
           {
             after = [ bridgeDevice ];
@@ -268,10 +274,11 @@ let
         };
       };
     };
-in
+
-let
   files = util.collectNixFiles root;
-  guestFiles = lib.filterAttrs (file: type: type == "regular" && lib.hasSuffix ".nix" file) (builtins.readDir root);
+  guestFiles = lib.filterAttrs (file: type: type == "regular" && lib.hasSuffix ".nix" file) (
+    builtins.readDir root
+  );
   names = map (file: lib.removeSuffix ".nix" file) (lib.attrNames guestFiles);
 in
 {

src/dotfiles/hosts.nix

@@ -26,7 +26,8 @@ let
         guestModules
 
         # TODO: refactor
-        registryModule (root + "/${name}")
+        registryModule
+        (root + "/${name}")
 
         {
           networking.hostName = name;
@@ -34,12 +35,8 @@ let
         }
       ];
     };
-in
+
-let
   directories = lib.filterAttrs (_name: type: type == "directory") (builtins.readDir root);
   names = lib.attrNames directories;
 in
-lib.genAttrs names (
+lib.genAttrs names (name: mkHost { inherit root name; })
-  name:
-  mkHost { inherit root name; }
-)

src/dotfiles/registry.nix

@@ -1,4 +1,8 @@
-{ hosts, lib, root }:
+{
+  hosts,
+  lib,
+  root,
+}:
 let
   checkType = lib.types.submodule {
     options = {
@@ -19,7 +23,8 @@ let
   };
 
   predicates = {
-    uniqueValue = value: entries: builtins.length (lib.unique (map value entries)) == builtins.length entries;
+    uniqueValue =
+      value: entries: builtins.length (lib.unique (map value entries)) == builtins.length entries;
   };
 
   registryLib = lib // {
@@ -57,7 +62,9 @@ let
 
   registryName = fileName: lib.removeSuffix ".nix" fileName;
 
-  registryOption = registry: lib.mkOption {
+  registryOption =
+    registry:
+    lib.mkOption {
       type = lib.types.attrsOf (lib.types.attrsOf registry.type);
       default = { };
       description = ''
@@ -65,7 +72,8 @@ let
       '';
     };
 
-  mkRegistry = path:
+  mkRegistry =
+    path:
     let
       evaluated = lib.evalModules {
         specialArgs.lib = registryLib;
@@ -79,15 +87,21 @@ let
       inherit (evaluated.config) type replicate checks;
     };
 
-  definitions = lib.mapAttrs' (
+  definitions =
-    name: type:
+    lib.mapAttrs'
+      (
+        name: _type:
         let
           path = root + "/${name}";
         in
         lib.nameValuePair (registryName name) (mkRegistry path)
-  ) (lib.filterAttrs (name: type: type == "regular" && lib.hasSuffix ".nix" name) (builtins.readDir root));
+      )
+      (
+        lib.filterAttrs (name: type: type == "regular" && lib.hasSuffix ".nix" name) (builtins.readDir root)
+      );
 
-  flattenRegistryEntries = registryName: data:
+  flattenRegistryEntries =
+    registryName: data:
     lib.concatLists (
       lib.mapAttrsToList (
         host: entries:
@@ -98,10 +112,12 @@ let
       ) data
     );
 
-  rawDeclarations = registryName: hosts:
+  rawDeclarations =
+    registryName: hosts:
     lib.mapAttrs (_hostName: host: host.config.registry.${registryName} or { }) hosts;
 
-  replicatedEntries = registryName: raw:
+  replicatedEntries =
+    registryName: raw:
     let
       entries = lib.concatLists (
         lib.concatLists (
@@ -126,18 +142,21 @@ let
         else
           throw "conflicting replicated registry entry ${entry.path} does not match ${acc.${entry.entryName}.path}"
       else
-        acc // {
+        acc
+        // {
           ${entry.entryName} = entry;
         }
     ) { } entries;
 
-  replicatedData = registryName: hosts: raw:
+  replicatedData =
+    registryName: hosts: raw:
     let
       entries = lib.mapAttrs (_entryName: entry: entry.value) (replicatedEntries registryName raw);
     in
     lib.mapAttrs (_hostName: _host: entries) hosts;
 
-  validationAssertions = data:
+  validationAssertions =
+    data:
     lib.concatLists (
       lib.mapAttrsToList (
         registryName: registry:
@@ -151,7 +170,8 @@ let
       ) definitions
     );
 
-  assertValid = data:
+  assertValid =
+    data:
     let
       assertions = validationAssertions data;
       failures = lib.filter (assertion: !assertion.assertion) assertions;
@@ -161,9 +181,12 @@ let
     );
     data;
 
-  join = registry: host: entry:
+  join =
+    registry: host: entry:
     lib.filterAttrs (_name: value: value != null) (
-      lib.mapAttrs (registryName: _registry: (registry.${registryName}.${host} or { }).${entry} or null) definitions
+      lib.mapAttrs (
+        registryName: _registry: (registry.${registryName}.${host} or { }).${entry} or null
+      ) definitions
     );
 
   collectData =
@@ -180,7 +203,8 @@ let
     in
     assertValid data;
 
-  withOperations = registry:
+  withOperations =
+    registry:
     registry
     // {
       join = host: entry: join registry host entry;
@@ -190,8 +214,10 @@ in
   types = lib.mapAttrs (_name: definition: definition.type) definitions;
 
   module = {
-    options.registry = lib.mapAttrs (_name: registry: registryOption registry) definitions;
+    options.registry = lib.mapAttrs (_name: registryOption) definitions;
   };
 
-  collected = withOperations (collectData { inherit hosts; });
+  collected = withOperations (collectData {
+    inherit hosts;
+  });
 }

src/dotfiles/util.nix

@@ -28,5 +28,14 @@ in
       hash = builtins.hashString "sha256" name;
       octet = i: builtins.substring (i * 2) 2 hash;
     in
-    lib.concatStringsSep ":" ([ "02" ] ++ map octet [ 0 1 2 3 4 ]);
+    lib.concatStringsSep ":" (
+      [ "02" ]
+      ++ map octet [
+        0
+        1
+        2
+        3
+        4
+      ]
+    );
 }