diff --git a/default.nix b/default.nix
index 6ef5f0b..c5c2096 100644
--- a/default.nix
+++ b/default.nix
@@ -1,48 +1,85 @@
-{ pkgs ? import <nixpkgs> {}, ... }: let
-  inherit (builtins) genericClosure hasAttr length map;
+{
+  pkgs ? import <nixpkgs> { },
+  ...
+}:
+let
+  inherit (builtins)
+    genericClosure
+    hasAttr
+    length
+    map
+    ;
   inherit (pkgs) runCommandLocal writeText;
-  inherit (pkgs.lib) concatLines concatLists concatMap filter isDerivation isList mapAttrsToList;
-in rec {
+  inherit (pkgs.lib)
+    concatLines
+    concatLists
+    concatMap
+    filter
+    isDerivation
+    isList
+    mapAttrsToList
+    ;
+in
+rec {
   drvOutputs = drv: if hasAttr "outputs" drv then map (out: drv.${out}) drv.outputs else [ drv ];
-  drvDeps = drv:
-    mapAttrsToList (k: v:
-      if isDerivation v then (drvOutputs v)
-      else if isList v then concatMap drvOutputs (filter isDerivation v)
-      else []
+  drvDeps =
+    drv:
+    mapAttrsToList (
+      k: v:
+      if isDerivation v then
+        (drvOutputs v)
+      else if isList v then
+        concatMap drvOutputs (filter isDerivation v)
+      else
+        [ ]
     ) drv;
-  drvClosure = let
-    wrap = drv: { key = drv.outPath; inherit drv; };
-  in drv: map (obj: obj.drv) (genericClosure {
-    startSet = map wrap (drvOutputs drv);
-    operator = obj: map wrap (concatLists (drvDeps obj.drv.drvAttrs));
-  });
-  drvMaintainers = drv:
-    if ! hasAttr "meta" drv then []
-    else if ! hasAttr "maintainers" drv.meta then []
-    else drv.meta.maintainers;
-  nobodyMaintains = drv:
-    hasAttr "meta" drv &&
-    hasAttr "maintainers" drv.meta &&
-    (length drv.meta.maintainers) == 0;
+  drvClosure =
+    let
+      wrap = drv: {
+        key = drv.outPath;
+        inherit drv;
+      };
+    in
+    drv:
+    map (obj: obj.drv) (genericClosure {
+      startSet = map wrap (drvOutputs drv);
+      operator = obj: map wrap (concatLists (drvDeps obj.drv.drvAttrs));
+    });
+  drvMaintainers =
+    drv:
+    if !hasAttr "meta" drv then
+      [ ]
+    else if !hasAttr "maintainers" drv.meta then
+      [ ]
+    else
+      drv.meta.maintainers;
+  nobodyMaintains =
+    drv: hasAttr "meta" drv && hasAttr "maintainers" drv.meta && (length drv.meta.maintainers) == 0;
   stringJoin = objToString: objs: writeText "txt" (concatLines (map objToString objs));
 
-  allMaintainers = drv: let
-    closure = drvClosure drv;
-    maintainers = concatMap drvMaintainers closure;
-    mainToString = m: "${m.name} (${m.email})";
-  in runCommandLocal "uniq-maintainers.txt" {} ''
-    <${stringJoin mainToString maintainers} sort | uniq -c > $out
-  '';
+  allMaintainers =
+    drv:
+    let
+      closure = drvClosure drv;
+      maintainers = concatMap drvMaintainers closure;
+      mainToString = m: "${m.name} (${m.email})";
+    in
+    runCommandLocal "uniq-maintainers.txt" { } ''
+      <${stringJoin mainToString maintainers} sort | uniq -c > $out
+    '';
 
-  noMaintainers = drv: let
-    closure = drvClosure drv;
-    unmaintained = filter nobodyMaintains closure;
-    drvToString = drv: "${drv.name} ${drv.meta.position}";
-  in runCommandLocal "no-maintainers.txt" {} ''
-    <${stringJoin drvToString unmaintained} sort -u \
-      | sed 's/\/nix\/store\/[^/]*/https:\/\/github.com\/NixOS\/nixpkgs\/blob\/master/' \
-      | sed 's/.nix:\(.*\)$/#L\1/' \
-      | ${pkgs.unixtools.column}/bin/column -t \
-      > $out
-  '';
+  noMaintainers =
+    drv:
+    let
+      closure = drvClosure drv;
+      unmaintained = filter nobodyMaintains closure;
+      drvToString = drv: "${drv.name} ${drv.meta.position}";
+    in
+    runCommandLocal "no-maintainers.txt" { } ''
+      <${stringJoin drvToString unmaintained} sort -u \
+        | sed 's/\/nix\/store\/[^/]*/https:\/\/github.com\/NixOS\/nixpkgs\/blob\/master/' \
+        | sed 's/.nix:\(.*\)$/#L\1/' \
+        | ${pkgs.unixtools.column}/bin/column -t \
+        > $out
+    '';
 }
diff --git a/flake.nix b/flake.nix
index 88b49e5..3c961d1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,13 +1,18 @@
 {
-  outputs = { self, nixpkgs, ... }: let
-    system = "x86_64-linux";
-    pkgs = nixpkgs.legacyPackages.${system};
-    lib = import ./default.nix { inherit pkgs; };
-  in {
-    bundlers."x86_64-linux" = rec {
-      default = adopt;
-      maintainers = lib.allMaintainers;
-      adopt = lib.noMaintainers;
+  outputs =
+    { self, nixpkgs, ... }:
+    let
+      system = "x86_64-linux";
+      pkgs = nixpkgs.legacyPackages.${system};
+      lib = import ./default.nix { inherit pkgs; };
+    in
+    {
+      bundlers."x86_64-linux" = rec {
+        default = adopt;
+        maintainers = lib.allMaintainers;
+        adopt = lib.noMaintainers;
+      };
+
+      formatter."x86_64-linux" = pkgs.nixfmt-rfc-style;
     };
-  };
 }