diff --git a/.plan.nix/avh4-lib.nix b/.plan.nix/avh4-lib.nix
new file mode 100644
index 000000000..be80b457b
--- /dev/null
+++ b/.plan.nix/avh4-lib.nix
@@ -0,0 +1,74 @@
+{ system
+  , compiler
+  , flags
+  , pkgs
+  , hsPkgs
+  , pkgconfPkgs
+  , errorHandler
+  , config
+  , ... }:
+  {
+    flags = {};
+    package = {
+      specVersion = "2.4";
+      identifier = { name = "avh4-lib"; version = "0.0.0.1"; };
+      license = "BSD-3-Clause";
+      copyright = "See https://github.com/avh4/elm-format/blob/master/LICENSE";
+      maintainer = "gruen0aermel@gmail.com";
+      author = "Aaron VonderHaar";
+      homepage = "";
+      url = "";
+      synopsis = "Common code for haskell projects";
+      description = "";
+      buildType = "Simple";
+      isLocal = true;
+      };
+    components = {
+      "library" = {
+        depends = [
+          (hsPkgs."ansi-terminal" or (errorHandler.buildDepError "ansi-terminal"))
+          (hsPkgs."ansi-wl-pprint" or (errorHandler.buildDepError "ansi-wl-pprint"))
+          (hsPkgs."array" or (errorHandler.buildDepError "array"))
+          (hsPkgs."base" or (errorHandler.buildDepError "base"))
+          (hsPkgs."bimap" or (errorHandler.buildDepError "bimap"))
+          (hsPkgs."binary" or (errorHandler.buildDepError "binary"))
+          (hsPkgs."bytestring" or (errorHandler.buildDepError "bytestring"))
+          (hsPkgs."containers" or (errorHandler.buildDepError "containers"))
+          (hsPkgs."directory" or (errorHandler.buildDepError "directory"))
+          (hsPkgs."filepath" or (errorHandler.buildDepError "filepath"))
+          (hsPkgs."mtl" or (errorHandler.buildDepError "mtl"))
+          (hsPkgs."process" or (errorHandler.buildDepError "process"))
+          (hsPkgs."relude" or (errorHandler.buildDepError "relude"))
+          (hsPkgs."text" or (errorHandler.buildDepError "text"))
+          ];
+        buildable = true;
+        };
+      tests = {
+        "al-tests" = {
+          depends = [
+            (hsPkgs."ansi-terminal" or (errorHandler.buildDepError "ansi-terminal"))
+            (hsPkgs."ansi-wl-pprint" or (errorHandler.buildDepError "ansi-wl-pprint"))
+            (hsPkgs."array" or (errorHandler.buildDepError "array"))
+            (hsPkgs."base" or (errorHandler.buildDepError "base"))
+            (hsPkgs."bimap" or (errorHandler.buildDepError "bimap"))
+            (hsPkgs."binary" or (errorHandler.buildDepError "binary"))
+            (hsPkgs."bytestring" or (errorHandler.buildDepError "bytestring"))
+            (hsPkgs."containers" or (errorHandler.buildDepError "containers"))
+            (hsPkgs."directory" or (errorHandler.buildDepError "directory"))
+            (hsPkgs."filepath" or (errorHandler.buildDepError "filepath"))
+            (hsPkgs."mtl" or (errorHandler.buildDepError "mtl"))
+            (hsPkgs."process" or (errorHandler.buildDepError "process"))
+            (hsPkgs."relude" or (errorHandler.buildDepError "relude"))
+            (hsPkgs."text" or (errorHandler.buildDepError "text"))
+            (hsPkgs."tasty" or (errorHandler.buildDepError "tasty"))
+            (hsPkgs."tasty-hspec" or (errorHandler.buildDepError "tasty-hspec"))
+            (hsPkgs."tasty-hunit" or (errorHandler.buildDepError "tasty-hunit"))
+            ];
+          build-tools = [
+            (hsPkgs.buildPackages.tasty-discover.components.exes.tasty-discover or (pkgs.buildPackages.tasty-discover or (errorHandler.buildToolDepError "tasty-discover:tasty-discover")))
+            ];
+          buildable = true;
+          };
+        };
+      };
+    } // rec { src = (pkgs.lib).mkDefault ../avh4-lib; }
diff --git a/.plan.nix/elm-format-lib.nix b/.plan.nix/elm-format-lib.nix
new file mode 100644
index 000000000..fec2929e7
--- /dev/null
+++ b/.plan.nix/elm-format-lib.nix
@@ -0,0 +1,86 @@
+{ system
+  , compiler
+  , flags
+  , pkgs
+  , hsPkgs
+  , pkgconfPkgs
+  , errorHandler
+  , config
+  , ... }:
+  {
+    flags = {};
+    package = {
+      specVersion = "2.4";
+      identifier = { name = "elm-format-lib"; version = "0.0.0.1"; };
+      license = "BSD-3-Clause";
+      copyright = "See https://github.com/avh4/elm-format/blob/master/LICENSE";
+      maintainer = "gruen0aermel@gmail.com";
+      author = "Aaron VonderHaar";
+      homepage = "";
+      url = "";
+      synopsis = "Common code used by elm-format and elm-refactor";
+      description = "";
+      buildType = "Simple";
+      isLocal = true;
+      };
+    components = {
+      "library" = {
+        depends = [
+          (hsPkgs."aeson" or (errorHandler.buildDepError "aeson"))
+          (hsPkgs."ansi-terminal" or (errorHandler.buildDepError "ansi-terminal"))
+          (hsPkgs."ansi-wl-pprint" or (errorHandler.buildDepError "ansi-wl-pprint"))
+          (hsPkgs."array" or (errorHandler.buildDepError "array"))
+          (hsPkgs."base" or (errorHandler.buildDepError "base"))
+          (hsPkgs."bimap" or (errorHandler.buildDepError "bimap"))
+          (hsPkgs."binary" or (errorHandler.buildDepError "binary"))
+          (hsPkgs."bytestring" or (errorHandler.buildDepError "bytestring"))
+          (hsPkgs."containers" or (errorHandler.buildDepError "containers"))
+          (hsPkgs."directory" or (errorHandler.buildDepError "directory"))
+          (hsPkgs."filepath" or (errorHandler.buildDepError "filepath"))
+          (hsPkgs."ghc-prim" or (errorHandler.buildDepError "ghc-prim"))
+          (hsPkgs."mtl" or (errorHandler.buildDepError "mtl"))
+          (hsPkgs."optparse-applicative" or (errorHandler.buildDepError "optparse-applicative"))
+          (hsPkgs."process" or (errorHandler.buildDepError "process"))
+          (hsPkgs."relude" or (errorHandler.buildDepError "relude"))
+          (hsPkgs."text" or (errorHandler.buildDepError "text"))
+          (hsPkgs."avh4-lib" or (errorHandler.buildDepError "avh4-lib"))
+          (hsPkgs."elm-format-markdown" or (errorHandler.buildDepError "elm-format-markdown"))
+          ];
+        buildable = true;
+        };
+      tests = {
+        "efl-tests" = {
+          depends = [
+            (hsPkgs."aeson" or (errorHandler.buildDepError "aeson"))
+            (hsPkgs."ansi-terminal" or (errorHandler.buildDepError "ansi-terminal"))
+            (hsPkgs."ansi-wl-pprint" or (errorHandler.buildDepError "ansi-wl-pprint"))
+            (hsPkgs."array" or (errorHandler.buildDepError "array"))
+            (hsPkgs."base" or (errorHandler.buildDepError "base"))
+            (hsPkgs."bimap" or (errorHandler.buildDepError "bimap"))
+            (hsPkgs."binary" or (errorHandler.buildDepError "binary"))
+            (hsPkgs."bytestring" or (errorHandler.buildDepError "bytestring"))
+            (hsPkgs."containers" or (errorHandler.buildDepError "containers"))
+            (hsPkgs."directory" or (errorHandler.buildDepError "directory"))
+            (hsPkgs."filepath" or (errorHandler.buildDepError "filepath"))
+            (hsPkgs."ghc-prim" or (errorHandler.buildDepError "ghc-prim"))
+            (hsPkgs."mtl" or (errorHandler.buildDepError "mtl"))
+            (hsPkgs."optparse-applicative" or (errorHandler.buildDepError "optparse-applicative"))
+            (hsPkgs."process" or (errorHandler.buildDepError "process"))
+            (hsPkgs."relude" or (errorHandler.buildDepError "relude"))
+            (hsPkgs."text" or (errorHandler.buildDepError "text"))
+            (hsPkgs."avh4-lib" or (errorHandler.buildDepError "avh4-lib"))
+            (hsPkgs."elm-format-markdown" or (errorHandler.buildDepError "elm-format-markdown"))
+            (hsPkgs."split" or (errorHandler.buildDepError "split"))
+            (hsPkgs."tasty" or (errorHandler.buildDepError "tasty"))
+            (hsPkgs."tasty-hspec" or (errorHandler.buildDepError "tasty-hspec"))
+            (hsPkgs."tasty-hunit" or (errorHandler.buildDepError "tasty-hunit"))
+            (hsPkgs."elm-format-test-lib" or (errorHandler.buildDepError "elm-format-test-lib"))
+            ];
+          build-tools = [
+            (hsPkgs.buildPackages.tasty-discover.components.exes.tasty-discover or (pkgs.buildPackages.tasty-discover or (errorHandler.buildToolDepError "tasty-discover:tasty-discover")))
+            ];
+          buildable = true;
+          };
+        };
+      };
+    } // rec { src = (pkgs.lib).mkDefault ../elm-format-lib; }
diff --git a/.plan.nix/elm-format-markdown.nix b/.plan.nix/elm-format-markdown.nix
new file mode 100644
index 000000000..5c4e3ff0d
--- /dev/null
+++ b/.plan.nix/elm-format-markdown.nix
@@ -0,0 +1,37 @@
+{ system
+  , compiler
+  , flags
+  , pkgs
+  , hsPkgs
+  , pkgconfPkgs
+  , errorHandler
+  , config
+  , ... }:
+  {
+    flags = {};
+    package = {
+      specVersion = "2.4";
+      identifier = { name = "elm-format-markdown"; version = "0.0.0.1"; };
+      license = "BSD-3-Clause";
+      copyright = "See https://github.com/avh4/elm-format/blob/master/LICENSE";
+      maintainer = "gruen0aermel@gmail.com";
+      author = "Aaron VonderHaar";
+      homepage = "";
+      url = "";
+      synopsis = "Markdown parsing for Elm documentation comments";
+      description = "";
+      buildType = "Simple";
+      isLocal = true;
+      };
+    components = {
+      "library" = {
+        depends = [
+          (hsPkgs."base" or (errorHandler.buildDepError "base"))
+          (hsPkgs."containers" or (errorHandler.buildDepError "containers"))
+          (hsPkgs."mtl" or (errorHandler.buildDepError "mtl"))
+          (hsPkgs."text" or (errorHandler.buildDepError "text"))
+          ];
+        buildable = true;
+        };
+      };
+    } // rec { src = (pkgs.lib).mkDefault ../elm-format-markdown; }
diff --git a/.plan.nix/elm-format-test-lib.nix b/.plan.nix/elm-format-test-lib.nix
new file mode 100644
index 000000000..d716a4e41
--- /dev/null
+++ b/.plan.nix/elm-format-test-lib.nix
@@ -0,0 +1,67 @@
+{ system
+  , compiler
+  , flags
+  , pkgs
+  , hsPkgs
+  , pkgconfPkgs
+  , errorHandler
+  , config
+  , ... }:
+  {
+    flags = {};
+    package = {
+      specVersion = "2.4";
+      identifier = { name = "elm-format-test-lib"; version = "0.0.0.1"; };
+      license = "BSD-3-Clause";
+      copyright = "See https://github.com/avh4/elm-format/blob/master/LICENSE";
+      maintainer = "gruen0aermel@gmail.com";
+      author = "Aaron VonderHaar";
+      homepage = "";
+      url = "";
+      synopsis = "Test helpers used by elm-format-tests and elm-refactor-tests";
+      description = "";
+      buildType = "Simple";
+      isLocal = true;
+      };
+    components = {
+      "library" = {
+        depends = [
+          (hsPkgs."base" or (errorHandler.buildDepError "base"))
+          (hsPkgs."containers" or (errorHandler.buildDepError "containers"))
+          (hsPkgs."filepath" or (errorHandler.buildDepError "filepath"))
+          (hsPkgs."hspec-core" or (errorHandler.buildDepError "hspec-core"))
+          (hsPkgs."hspec-golden" or (errorHandler.buildDepError "hspec-golden"))
+          (hsPkgs."mtl" or (errorHandler.buildDepError "mtl"))
+          (hsPkgs."split" or (errorHandler.buildDepError "split"))
+          (hsPkgs."tasty" or (errorHandler.buildDepError "tasty"))
+          (hsPkgs."tasty-hspec" or (errorHandler.buildDepError "tasty-hspec"))
+          (hsPkgs."tasty-hunit" or (errorHandler.buildDepError "tasty-hunit"))
+          (hsPkgs."text" or (errorHandler.buildDepError "text"))
+          (hsPkgs."avh4-lib" or (errorHandler.buildDepError "avh4-lib"))
+          ];
+        buildable = true;
+        };
+      tests = {
+        "elm-format-test-lib-tests" = {
+          depends = [
+            (hsPkgs."base" or (errorHandler.buildDepError "base"))
+            (hsPkgs."containers" or (errorHandler.buildDepError "containers"))
+            (hsPkgs."filepath" or (errorHandler.buildDepError "filepath"))
+            (hsPkgs."hspec-core" or (errorHandler.buildDepError "hspec-core"))
+            (hsPkgs."hspec-golden" or (errorHandler.buildDepError "hspec-golden"))
+            (hsPkgs."mtl" or (errorHandler.buildDepError "mtl"))
+            (hsPkgs."split" or (errorHandler.buildDepError "split"))
+            (hsPkgs."tasty" or (errorHandler.buildDepError "tasty"))
+            (hsPkgs."tasty-hspec" or (errorHandler.buildDepError "tasty-hspec"))
+            (hsPkgs."tasty-hunit" or (errorHandler.buildDepError "tasty-hunit"))
+            (hsPkgs."text" or (errorHandler.buildDepError "text"))
+            (hsPkgs."avh4-lib" or (errorHandler.buildDepError "avh4-lib"))
+            ];
+          build-tools = [
+            (hsPkgs.buildPackages.tasty-discover.components.exes.tasty-discover or (pkgs.buildPackages.tasty-discover or (errorHandler.buildToolDepError "tasty-discover:tasty-discover")))
+            ];
+          buildable = true;
+          };
+        };
+      };
+    } // rec { src = (pkgs.lib).mkDefault .././.././elm-format-test-lib; }
\ No newline at end of file
diff --git a/.plan.nix/elm-format.nix b/.plan.nix/elm-format.nix
new file mode 100644
index 000000000..8e1eea5fd
--- /dev/null
+++ b/.plan.nix/elm-format.nix
@@ -0,0 +1,72 @@
+{ system
+  , compiler
+  , flags
+  , pkgs
+  , hsPkgs
+  , pkgconfPkgs
+  , errorHandler
+  , config
+  , ... }:
+  {
+    flags = {};
+    package = {
+      specVersion = "2.4";
+      identifier = { name = "elm-format"; version = "0.8.5"; };
+      license = "BSD-3-Clause";
+      copyright = "See https://github.com/avh4/elm-format/blob/master/LICENSE";
+      maintainer = "gruen0aermel@gmail.com";
+      author = "Aaron VonderHaar";
+      homepage = "https://elm-lang.org";
+      url = "";
+      synopsis = "A source code formatter for Elm";
+      description = "A simple way to format your Elm code according to the official\nstyle guide.";
+      buildType = "Simple";
+      isLocal = true;
+      };
+    components = {
+      exes = {
+        "elm-format" = {
+          depends = [
+            (hsPkgs."aeson" or (errorHandler.buildDepError "aeson"))
+            (hsPkgs."ansi-wl-pprint" or (errorHandler.buildDepError "ansi-wl-pprint"))
+            (hsPkgs."base" or (errorHandler.buildDepError "base"))
+            (hsPkgs."bytestring" or (errorHandler.buildDepError "bytestring"))
+            (hsPkgs."containers" or (errorHandler.buildDepError "containers"))
+            (hsPkgs."optparse-applicative" or (errorHandler.buildDepError "optparse-applicative"))
+            (hsPkgs."relude" or (errorHandler.buildDepError "relude"))
+            (hsPkgs."text" or (errorHandler.buildDepError "text"))
+            (hsPkgs."avh4-lib" or (errorHandler.buildDepError "avh4-lib"))
+            (hsPkgs."elm-format-lib" or (errorHandler.buildDepError "elm-format-lib"))
+            ];
+          buildable = true;
+          };
+        };
+      tests = {
+        "elm-format-tests" = {
+          depends = [
+            (hsPkgs."aeson" or (errorHandler.buildDepError "aeson"))
+            (hsPkgs."ansi-wl-pprint" or (errorHandler.buildDepError "ansi-wl-pprint"))
+            (hsPkgs."base" or (errorHandler.buildDepError "base"))
+            (hsPkgs."bytestring" or (errorHandler.buildDepError "bytestring"))
+            (hsPkgs."containers" or (errorHandler.buildDepError "containers"))
+            (hsPkgs."optparse-applicative" or (errorHandler.buildDepError "optparse-applicative"))
+            (hsPkgs."relude" or (errorHandler.buildDepError "relude"))
+            (hsPkgs."text" or (errorHandler.buildDepError "text"))
+            (hsPkgs."avh4-lib" or (errorHandler.buildDepError "avh4-lib"))
+            (hsPkgs."elm-format-lib" or (errorHandler.buildDepError "elm-format-lib"))
+            (hsPkgs."mtl" or (errorHandler.buildDepError "mtl"))
+            (hsPkgs."tasty" or (errorHandler.buildDepError "tasty"))
+            (hsPkgs."tasty-hspec" or (errorHandler.buildDepError "tasty-hspec"))
+            (hsPkgs."tasty-hunit" or (errorHandler.buildDepError "tasty-hunit"))
+            (hsPkgs."tasty-quickcheck" or (errorHandler.buildDepError "tasty-quickcheck"))
+            (hsPkgs."QuickCheck" or (errorHandler.buildDepError "QuickCheck"))
+            (hsPkgs."quickcheck-io" or (errorHandler.buildDepError "quickcheck-io"))
+            (hsPkgs."bimap" or (errorHandler.buildDepError "bimap"))
+            (hsPkgs."cmark" or (errorHandler.buildDepError "cmark"))
+            (hsPkgs."elm-format-test-lib" or (errorHandler.buildDepError "elm-format-test-lib"))
+            ];
+          buildable = true;
+          };
+        };
+      };
+    } // rec { src = (pkgs.lib).mkDefault ../.; }
diff --git a/avh4-lib/LICENSE b/avh4-lib/LICENSE
new file mode 100644
index 000000000..afffc9b91
--- /dev/null
+++ b/avh4-lib/LICENSE
@@ -0,0 +1,46 @@
+Copyright (c) 2015-2019, Aaron VonderHaar
+Copyright (c) 2012-2015, Evan Czaplicki (Elm parser forked from elm-lang/elm-compiler)
+Copyright (c) 2015, Martin Janiczek
+Copyright (c) 2015, Noah Hall
+Copyright (c) 2016, Marica Odagaki
+Copyright (c) 2016, Max Goldstein
+Copyright (c) 2016, Daniel Bachler
+Copyright (c) 2016, Fedor Nezhivoi
+Copyright (c) 2013, John MacFarlane (Markdown parser forked from jgm/cheapskate)
+Copyright (c) 2017, Michael Maloney
+Copyright (c) 1999-2000, Daan Leijen. (part of Text.Parsec.Token)
+Copyright (c) 2007, Paolo Martini. (part of Text.Parsec.Token)
+Copyright (c) 2018, Andreas Scharf
+Copyright (c) 2018, Matthias Devlamynck
+Copyright (c) 2018, Juliano Bortolozzo Solanho
+Copyright (c) 2020, Flavio Corpa
+
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of the copyright holder nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/avh4-lib/avh4-lib.cabal b/avh4-lib/avh4-lib.cabal
index ed6c388b1..e45217034 100644
--- a/avh4-lib/avh4-lib.cabal
+++ b/avh4-lib/avh4-lib.cabal
@@ -7,7 +7,7 @@ Synopsis:
     Common code for haskell projects
 
 License: BSD-3-Clause
-License-file: ../LICENSE
+License-file: LICENSE
 
 Author:     Aaron VonderHaar
 Maintainer: gruen0aermel@gmail.com
diff --git a/default.nix b/default.nix
new file mode 100644
index 000000000..97ab8e8be
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,21 @@
+{ sources ? import ./nix/sources.nix { }, pkgs ? null }:
+
+let
+  haskell-nix = if pkgs == null then
+    let
+      haskellNix = import sources.haskellNix { };
+      finalPkgs =
+        import haskellNix.sources.nixpkgs-unstable haskellNix.nixpkgsArgs;
+    in finalPkgs.haskell-nix
+
+  else
+    let haskellNix = import sources.haskellNix { inherit pkgs; };
+    in haskellNix.pkgs.haskell-nix;
+
+  pkgSet = haskell-nix.mkCabalProjectPkgSet {
+    plan-pkgs = import ./pkgs.nix;
+    pkg-def-extras = [ ];
+    modules = [ ];
+  };
+
+in pkgSet.config.hsPkgs
diff --git a/elm-format-lib/LICENSE b/elm-format-lib/LICENSE
new file mode 100644
index 000000000..afffc9b91
--- /dev/null
+++ b/elm-format-lib/LICENSE
@@ -0,0 +1,46 @@
+Copyright (c) 2015-2019, Aaron VonderHaar
+Copyright (c) 2012-2015, Evan Czaplicki (Elm parser forked from elm-lang/elm-compiler)
+Copyright (c) 2015, Martin Janiczek
+Copyright (c) 2015, Noah Hall
+Copyright (c) 2016, Marica Odagaki
+Copyright (c) 2016, Max Goldstein
+Copyright (c) 2016, Daniel Bachler
+Copyright (c) 2016, Fedor Nezhivoi
+Copyright (c) 2013, John MacFarlane (Markdown parser forked from jgm/cheapskate)
+Copyright (c) 2017, Michael Maloney
+Copyright (c) 1999-2000, Daan Leijen. (part of Text.Parsec.Token)
+Copyright (c) 2007, Paolo Martini. (part of Text.Parsec.Token)
+Copyright (c) 2018, Andreas Scharf
+Copyright (c) 2018, Matthias Devlamynck
+Copyright (c) 2018, Juliano Bortolozzo Solanho
+Copyright (c) 2020, Flavio Corpa
+
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of the copyright holder nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/elm-format-lib/elm-format-lib.cabal b/elm-format-lib/elm-format-lib.cabal
index 2be21921c..a3aa96241 100644
--- a/elm-format-lib/elm-format-lib.cabal
+++ b/elm-format-lib/elm-format-lib.cabal
@@ -7,7 +7,7 @@ Synopsis:
     Common code used by elm-format and elm-refactor
 
 License: BSD-3-Clause
-License-file: ../LICENSE
+License-file: LICENSE
 
 Author:     Aaron VonderHaar
 Maintainer: gruen0aermel@gmail.com
diff --git a/elm-format-test-lib/LICENSE b/elm-format-test-lib/LICENSE
new file mode 100644
index 000000000..afffc9b91
--- /dev/null
+++ b/elm-format-test-lib/LICENSE
@@ -0,0 +1,46 @@
+Copyright (c) 2015-2019, Aaron VonderHaar
+Copyright (c) 2012-2015, Evan Czaplicki (Elm parser forked from elm-lang/elm-compiler)
+Copyright (c) 2015, Martin Janiczek
+Copyright (c) 2015, Noah Hall
+Copyright (c) 2016, Marica Odagaki
+Copyright (c) 2016, Max Goldstein
+Copyright (c) 2016, Daniel Bachler
+Copyright (c) 2016, Fedor Nezhivoi
+Copyright (c) 2013, John MacFarlane (Markdown parser forked from jgm/cheapskate)
+Copyright (c) 2017, Michael Maloney
+Copyright (c) 1999-2000, Daan Leijen. (part of Text.Parsec.Token)
+Copyright (c) 2007, Paolo Martini. (part of Text.Parsec.Token)
+Copyright (c) 2018, Andreas Scharf
+Copyright (c) 2018, Matthias Devlamynck
+Copyright (c) 2018, Juliano Bortolozzo Solanho
+Copyright (c) 2020, Flavio Corpa
+
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of the copyright holder nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/elm-format-test-lib/elm-format-test-lib.cabal b/elm-format-test-lib/elm-format-test-lib.cabal
index 8a3c31eb2..15a0ea095 100644
--- a/elm-format-test-lib/elm-format-test-lib.cabal
+++ b/elm-format-test-lib/elm-format-test-lib.cabal
@@ -7,7 +7,7 @@ Synopsis:
     Test helpers used by elm-format-tests and elm-refactor-tests
 
 License: BSD-3-Clause
-License-file: ../LICENSE
+License-file: LICENSE
 
 Author:     Aaron VonderHaar
 Maintainer: gruen0aermel@gmail.com
diff --git a/nix/sources.json b/nix/sources.json
index 92664088e..efb0e573e 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -1,4 +1,16 @@
 {
+    "haskellNix": {
+        "branch": "master",
+        "description": "Alternative Haskell Infrastructure for Nixpkgs",
+        "homepage": "https://input-output-hk.github.io/haskell.nix",
+        "owner": "input-output-hk",
+        "repo": "haskell.nix",
+        "rev": "b87bc95b041e322ab00e136bb34ac526839536fc",
+        "sha256": "1c7rj110anz69110mygx5xr9g5rx93xwgn9yx1ak5755i9hpxj6p",
+        "type": "tarball",
+        "url": "https://github.com/input-output-hk/haskell.nix/archive/b87bc95b041e322ab00e136bb34ac526839536fc.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
     "niv": {
         "branch": "master",
         "description": "Easy dependency management for Nix projects",
diff --git a/nix/sources.nix b/nix/sources.nix
index 1938409dd..feb353843 100644
--- a/nix/sources.nix
+++ b/nix/sources.nix
@@ -31,8 +31,10 @@ let
           if spec ? branch then "refs/heads/${spec.branch}" else
             if spec ? tag then "refs/tags/${spec.tag}" else
               abort "In git source '${name}': Please specify `ref`, `tag` or `branch`!";
+      submodules = if spec ? submodules then spec.submodules else false;
     in
-      builtins.fetchGit { url = spec.repo; inherit (spec) rev; inherit ref; };
+      builtins.fetchGit { url = spec.repo; inherit (spec) rev; inherit ref; }
+      // (if builtins.compareVersions builtins.nixVersion "2.4" >= 0 then { inherit submodules; } else { });
 
   fetch_local = spec: spec.path;
 
diff --git a/pkgs.nix b/pkgs.nix
new file mode 100644
index 000000000..ea75476f5
--- /dev/null
+++ b/pkgs.nix
@@ -0,0 +1,289 @@
+{
+  pkgs = hackage:
+    {
+      packages = {
+        "wcwidth".revision = (((hackage."wcwidth")."0.0.2").revisions).default;
+        "wcwidth".flags.split-base = true;
+        "wcwidth".flags.cli = false;
+        "tasty-smallcheck".revision = (((hackage."tasty-smallcheck")."0.8.2").revisions).default;
+        "tf-random".revision = (((hackage."tf-random")."0.5").revisions).default;
+        "pretty".revision = (((hackage."pretty")."1.1.3.6").revisions).default;
+        "unordered-containers".revision = (((hackage."unordered-containers")."0.2.16.0").revisions).default;
+        "unordered-containers".flags.debug = false;
+        "integer-logarithms".revision = (((hackage."integer-logarithms")."1.0.3.1").revisions).default;
+        "HUnit".revision = (((hackage."HUnit")."1.6.2.0").revisions).default;
+        "dlist".revision = (((hackage."dlist")."1.0").revisions).default;
+        "text".revision = (((hackage."text")."1.2.5.0").revisions).default;
+        "text".flags.developer = false;
+        "array".revision = (((hackage."array")."0.5.4.0").revisions).default;
+        "vector".revision = (((hackage."vector")."0.12.3.1").revisions).default;
+        "comonad".revision = (((hackage."comonad")."5.0.8").revisions).default;
+        "comonad".flags.containers = true;
+        "comonad".flags.distributive = true;
+        "comonad".flags.indexed-traversable = true;
+        "base-compat".revision = (((hackage."base-compat")."0.12.1").revisions).default;
+        "contravariant".revision = (((hackage."contravariant")."1.5.5").revisions).default;
+        "base-compat-batteries".revision = (((hackage."base-compat-batteries")."0.12.1").revisions).default;
+        "tasty-quickcheck".revision = (((hackage."tasty-quickcheck")."0.10.2").revisions).default;
+        "assoc".revision = (((hackage."assoc")."1.0.2").revisions).default;
+        "data-fix".revision = (((hackage."data-fix")."0.3.2").revisions).default;
+        "quickcheck-io".revision = (((hackage."quickcheck-io")."0.2.0").revisions).default;
+        "smallcheck".revision = (((hackage."smallcheck")."1.2.1").revisions).default;
+        "tasty".revision = (((hackage."tasty")."1.4.2.1").revisions).default;
+        "tasty".flags.clock = true;
+        "tasty".flags.unix = true;
+        "mtl".revision = (((hackage."mtl")."2.2.2").revisions).default;
+        "OneTuple".revision = (((hackage."OneTuple")."0.3.1").revisions).default;
+        "bytestring".revision = (((hackage."bytestring")."0.11.1.0").revisions).default;
+        "bytestring".flags.integer-simple = false;
+        "hspec-discover".revision = (((hackage."hspec-discover")."2.7.10").revisions).default;
+        "strict".revision = (((hackage."strict")."0.4.0.1").revisions).default;
+        "strict".flags.assoc = true;
+        "aeson".revision = (((hackage."aeson")."2.0.2.0").revisions).default;
+        "aeson".flags.bytestring-builder = false;
+        "aeson".flags.ordered-keymap = true;
+        "aeson".flags.cffi = false;
+        "tagged".revision = (((hackage."tagged")."0.8.6.1").revisions).default;
+        "splitmix".revision = (((hackage."splitmix")."0.1.0.4").revisions).default;
+        "attoparsec".revision = (((hackage."attoparsec")."0.14.3").revisions).default;
+        "attoparsec".flags.developer = false;
+        "filepath".revision = (((hackage."filepath")."1.4.2.1").revisions).default;
+        "stm".revision = (((hackage."stm")."2.5.0.0").revisions).default;
+        "tasty-hspec".revision = (((hackage."tasty-hspec")."1.1.6").revisions).default;
+        "call-stack".revision = (((hackage."call-stack")."0.4.0").revisions).default;
+        "hspec-golden".revision = (((hackage."hspec-golden")."0.1.0.3").revisions).default;
+        "ghc-prim".revision = (((hackage."ghc-prim")."0.7.0").revisions).default;
+        "ghc-boot-th".revision = (((hackage."ghc-boot-th")."9.0.1").revisions).default;
+        "indexed-traversable".revision = (((hackage."indexed-traversable")."0.1.2").revisions).default;
+        "distributive".revision = (((hackage."distributive")."0.6.2.1").revisions).default;
+        "text-short".revision = (((hackage."text-short")."0.1.4").revisions).default;
+        "text-short".flags.asserts = false;
+        "bifunctors".revision = (((hackage."bifunctors")."5.5.11").revisions).default;
+        "bifunctors".flags.tagged = true;
+        "bifunctors".flags.semigroups = true;
+        "base".revision = (((hackage."base")."4.15.0.0").revisions).default;
+        "time".revision = (((hackage."time")."1.9.3").revisions).default;
+        "random".revision = (((hackage."random")."1.2.1").revisions).default;
+        "process".revision = (((hackage."process")."1.6.13.2").revisions).default;
+        "unbounded-delays".revision = (((hackage."unbounded-delays")."0.1.1.1").revisions).default;
+        "th-abstraction".revision = (((hackage."th-abstraction")."0.4.3.0").revisions).default;
+        "semigroupoids".revision = (((hackage."semigroupoids")."5.3.6").revisions).default;
+        "semigroupoids".flags.tagged = true;
+        "semigroupoids".flags.containers = true;
+        "semigroupoids".flags.distributive = true;
+        "semigroupoids".flags.unordered-containers = true;
+        "semigroupoids".flags.contravariant = true;
+        "semigroupoids".flags.comonad = true;
+        "bimap".revision = (((hackage."bimap")."0.4.0").revisions).default;
+        "logict".revision = (((hackage."logict")."0.7.0.3").revisions).default;
+        "these".revision = (((hackage."these")."1.1.1.1").revisions).default;
+        "these".flags.assoc = true;
+        "split".revision = (((hackage."split")."0.2.3.4").revisions).default;
+        "base-orphans".revision = (((hackage."base-orphans")."0.8.6").revisions).default;
+        "ghc-bignum".revision = (((hackage."ghc-bignum")."1.0").revisions).default;
+        "hspec-core".revision = (((hackage."hspec-core")."2.7.10").revisions).default;
+        "time-compat".revision = (((hackage."time-compat")."1.9.6.1").revisions).default;
+        "time-compat".flags.old-locale = false;
+        "setenv".revision = (((hackage."setenv")."0.1.1.3").revisions).default;
+        "hspec".revision = (((hackage."hspec")."2.7.10").revisions).default;
+        "primitive".revision = (((hackage."primitive")."0.7.3.0").revisions).default;
+        "directory".revision = (((hackage."directory")."1.3.7.0").revisions).default;
+        "exceptions".revision = (((hackage."exceptions")."0.10.4").revisions).default;
+        "optparse-applicative".revision = (((hackage."optparse-applicative")."0.16.1.0").revisions).default;
+        "optparse-applicative".flags.process = true;
+        "clock".revision = (((hackage."clock")."0.8.2").revisions).default;
+        "hspec-expectations".revision = (((hackage."hspec-expectations")."0.8.2").revisions).default;
+        "rts".revision = (((hackage."rts")."1.0").revisions).default;
+        "semialign".revision = (((hackage."semialign")."1.2.0.1").revisions).default;
+        "semialign".flags.semigroupoids = true;
+        "transformers".revision = (((hackage."transformers")."0.5.6.2").revisions).default;
+        "template-haskell".revision = (((hackage."template-haskell")."2.17.0.0").revisions).default;
+        "witherable".revision = (((hackage."witherable")."0.4.2").revisions).default;
+        "tasty-hunit".revision = (((hackage."tasty-hunit")."0.10.0.3").revisions).default;
+        "deepseq".revision = (((hackage."deepseq")."1.4.5.0").revisions).default;
+        "unix".revision = (((hackage."unix")."2.7.2.2").revisions).default;
+        "ansi-terminal".revision = (((hackage."ansi-terminal")."0.11").revisions).default;
+        "hashable".revision = (((hackage."hashable")."1.3.5.0").revisions).default;
+        "hashable".flags.random-initial-seed = false;
+        "hashable".flags.integer-gmp = true;
+        "transformers-compat".revision = (((hackage."transformers-compat")."0.7.1").revisions).default;
+        "indexed-traversable-instances".revision = (((hackage."indexed-traversable-instances")."0.1.1").revisions).default;
+        "relude".revision = (((hackage."relude")."1.0.0.1").revisions).default;
+        "scientific".revision = (((hackage."scientific")."0.3.7.0").revisions).default;
+        "scientific".flags.bytestring-builder = false;
+        "scientific".flags.integer-simple = false;
+        "binary".revision = (((hackage."binary")."0.8.9.0").revisions).default;
+        "ansi-wl-pprint".revision = (((hackage."ansi-wl-pprint")."0.6.9").revisions).default;
+        "QuickCheck".revision = (((hackage."QuickCheck")."2.14.2").revisions).default;
+        "QuickCheck".flags.old-random = false;
+        "QuickCheck".flags.templatehaskell = true;
+        "uuid-types".revision = (((hackage."uuid-types")."1.0.5").revisions).default;
+        "containers".revision = (((hackage."containers")."0.6.5.1").revisions).default;
+        "StateVar".revision = (((hackage."StateVar")."1.2.2").revisions).default;
+        "colour".revision = (((hackage."colour")."2.3.6").revisions).default;
+        };
+      compiler = {
+        version = "9.0.1";
+        nix-name = "ghc901";
+        packages = {
+          "pretty" = "1.1.3.6";
+          "integer-logarithms" = "1.0.3.1";
+          "HUnit" = "1.6.2.0";
+          "dlist" = "1.0";
+          "array" = "0.5.4.0";
+          "vector" = "0.12.3.1";
+          "contravariant" = "1.5.5";
+          "smallcheck" = "1.2.1";
+          "mtl" = "2.2.2";
+          "OneTuple" = "0.3.1";
+          "tagged" = "0.8.6.1";
+          "splitmix" = "0.1.0.4";
+          "filepath" = "1.4.2.1";
+          "stm" = "2.5.0.0";
+          "call-stack" = "0.4.0";
+          "ghc-prim" = "0.7.0";
+          "ghc-boot-th" = "9.0.1";
+          "distributive" = "0.6.2.1";
+          "base" = "4.15.0.0";
+          "time" = "1.9.3";
+          "unbounded-delays" = "0.1.1.1";
+          "logict" = "0.7.0.3";
+          "split" = "0.2.3.4";
+          "base-orphans" = "0.8.6";
+          "ghc-bignum" = "1.0";
+          "primitive" = "0.7.3.0";
+          "exceptions" = "0.10.4";
+          "clock" = "0.8.2";
+          "hspec-expectations" = "0.8.2";
+          "rts" = "1.0";
+          "transformers" = "0.5.6.2";
+          "template-haskell" = "2.17.0.0";
+          "deepseq" = "1.4.5.0";
+          "ansi-terminal" = "0.11";
+          "transformers-compat" = "0.7.1";
+          "ansi-wl-pprint" = "0.6.9";
+          "StateVar" = "1.2.2";
+          "colour" = "2.3.6";
+          };
+        };
+      };
+  extras = hackage:
+    {
+      packages = {
+        elm-format-markdown = ./.plan.nix/elm-format-markdown.nix;
+        elm-format-test-lib = ./.plan.nix/elm-format-test-lib.nix;
+        elm-format-lib = ./.plan.nix/elm-format-lib.nix;
+        avh4-lib = ./.plan.nix/avh4-lib.nix;
+        elm-format = ./.plan.nix/elm-format.nix;
+        };
+      };
+  modules = [
+    ({ lib, ... }:
+      {
+        packages = {
+          "elm-format-markdown" = { flags = {}; };
+          "elm-format-test-lib" = { flags = {}; };
+          "elm-format-lib" = { flags = {}; };
+          "avh4-lib" = { flags = {}; };
+          "elm-format" = { flags = {}; };
+          };
+        })
+    ({ lib, ... }:
+      {
+        packages = {
+          "hspec-core".components.library.planned = lib.mkOverride 900 true;
+          "ansi-terminal".components.library.planned = lib.mkOverride 900 true;
+          "tasty-quickcheck".components.library.planned = lib.mkOverride 900 true;
+          "base-orphans".components.library.planned = lib.mkOverride 900 true;
+          "bimap".components.library.planned = lib.mkOverride 900 true;
+          "these".components.library.planned = lib.mkOverride 900 true;
+          "filepath".components.library.planned = lib.mkOverride 900 true;
+          "distributive".components.library.planned = lib.mkOverride 900 true;
+          "pretty".components.library.planned = lib.mkOverride 900 true;
+          "hspec-golden".components.exes."hgold".planned = lib.mkOverride 900 true;
+          "quickcheck-io".components.library.planned = lib.mkOverride 900 true;
+          "bytestring".components.library.planned = lib.mkOverride 900 true;
+          "strict".components.library.planned = lib.mkOverride 900 true;
+          "comonad".components.library.planned = lib.mkOverride 900 true;
+          "data-fix".components.library.planned = lib.mkOverride 900 true;
+          "exceptions".components.library.planned = lib.mkOverride 900 true;
+          "call-stack".components.library.planned = lib.mkOverride 900 true;
+          "tasty-smallcheck".components.library.planned = lib.mkOverride 900 true;
+          "dlist".components.library.planned = lib.mkOverride 900 true;
+          "hspec-golden".components.library.planned = lib.mkOverride 900 true;
+          "ghc-prim".components.library.planned = lib.mkOverride 900 true;
+          "HUnit".components.library.planned = lib.mkOverride 900 true;
+          "elm-format-test-lib".components.library.planned = lib.mkOverride 900 true;
+          "array".components.library.planned = lib.mkOverride 900 true;
+          "binary".components.library.planned = lib.mkOverride 900 true;
+          "ghc-boot-th".components.library.planned = lib.mkOverride 900 true;
+          "scientific".components.library.planned = lib.mkOverride 900 true;
+          "relude".components.library.planned = lib.mkOverride 900 true;
+          "hspec-discover".components.exes."hspec-discover".planned = lib.mkOverride 900 true;
+          "splitmix".components.library.planned = lib.mkOverride 900 true;
+          "rts".components.library.planned = lib.mkOverride 900 true;
+          "tagged".components.library.planned = lib.mkOverride 900 true;
+          "unix".components.library.planned = lib.mkOverride 900 true;
+          "vector".components.library.planned = lib.mkOverride 900 true;
+          "indexed-traversable-instances".components.library.planned = lib.mkOverride 900 true;
+          "elm-format-markdown".components.library.planned = lib.mkOverride 900 true;
+          "directory".components.library.planned = lib.mkOverride 900 true;
+          "time".components.library.planned = lib.mkOverride 900 true;
+          "StateVar".components.library.planned = lib.mkOverride 900 true;
+          "smallcheck".components.library.planned = lib.mkOverride 900 true;
+          "setenv".components.library.planned = lib.mkOverride 900 true;
+          "ghc-bignum".components.library.planned = lib.mkOverride 900 true;
+          "indexed-traversable".components.library.planned = lib.mkOverride 900 true;
+          "base-compat-batteries".components.library.planned = lib.mkOverride 900 true;
+          "tasty-hunit".components.library.planned = lib.mkOverride 900 true;
+          "split".components.library.planned = lib.mkOverride 900 true;
+          "contravariant".components.library.planned = lib.mkOverride 900 true;
+          "hspec".components.library.planned = lib.mkOverride 900 true;
+          "text-short".components.library.planned = lib.mkOverride 900 true;
+          "assoc".components.library.planned = lib.mkOverride 900 true;
+          "process".components.library.planned = lib.mkOverride 900 true;
+          "hspec-discover".components.library.planned = lib.mkOverride 900 true;
+          "tf-random".components.library.planned = lib.mkOverride 900 true;
+          "clock".components.library.planned = lib.mkOverride 900 true;
+          "template-haskell".components.library.planned = lib.mkOverride 900 true;
+          "stm".components.library.planned = lib.mkOverride 900 true;
+          "witherable".components.library.planned = lib.mkOverride 900 true;
+          "elm-format-lib".components.library.planned = lib.mkOverride 900 true;
+          "semialign".components.library.planned = lib.mkOverride 900 true;
+          "logict".components.library.planned = lib.mkOverride 900 true;
+          "wcwidth".components.library.planned = lib.mkOverride 900 true;
+          "QuickCheck".components.library.planned = lib.mkOverride 900 true;
+          "ansi-wl-pprint".components.library.planned = lib.mkOverride 900 true;
+          "uuid-types".components.library.planned = lib.mkOverride 900 true;
+          "semigroupoids".components.library.planned = lib.mkOverride 900 true;
+          "attoparsec".components.library.planned = lib.mkOverride 900 true;
+          "elm-format".components.exes."elm-format".planned = lib.mkOverride 900 true;
+          "mtl".components.library.planned = lib.mkOverride 900 true;
+          "unbounded-delays".components.library.planned = lib.mkOverride 900 true;
+          "th-abstraction".components.library.planned = lib.mkOverride 900 true;
+          "transformers".components.library.planned = lib.mkOverride 900 true;
+          "OneTuple".components.library.planned = lib.mkOverride 900 true;
+          "deepseq".components.library.planned = lib.mkOverride 900 true;
+          "primitive".components.library.planned = lib.mkOverride 900 true;
+          "text".components.library.planned = lib.mkOverride 900 true;
+          "avh4-lib".components.library.planned = lib.mkOverride 900 true;
+          "bifunctors".components.library.planned = lib.mkOverride 900 true;
+          "unordered-containers".components.library.planned = lib.mkOverride 900 true;
+          "random".components.library.planned = lib.mkOverride 900 true;
+          "base".components.library.planned = lib.mkOverride 900 true;
+          "integer-logarithms".components.library.planned = lib.mkOverride 900 true;
+          "tasty".components.library.planned = lib.mkOverride 900 true;
+          "transformers-compat".components.library.planned = lib.mkOverride 900 true;
+          "colour".components.library.planned = lib.mkOverride 900 true;
+          "containers".components.library.planned = lib.mkOverride 900 true;
+          "time-compat".components.library.planned = lib.mkOverride 900 true;
+          "optparse-applicative".components.library.planned = lib.mkOverride 900 true;
+          "aeson".components.library.planned = lib.mkOverride 900 true;
+          "hspec-expectations".components.library.planned = lib.mkOverride 900 true;
+          "base-compat".components.library.planned = lib.mkOverride 900 true;
+          "hashable".components.library.planned = lib.mkOverride 900 true;
+          "tasty-hspec".components.library.planned = lib.mkOverride 900 true;
+          };
+        })
+    ];
+  }
\ No newline at end of file
diff --git a/release.nix b/release.nix
new file mode 100644
index 000000000..f1958245d
--- /dev/null
+++ b/release.nix
@@ -0,0 +1,27 @@
+{ sources ? import ./nix/sources.nix { } }:
+let
+  project = import ./default.nix;
+  pkgsNative = import sources.nixpkgs { };
+
+  pkgsLinux = pkgsNative;
+  pkgsMac = import sources.nixpkgs {
+    crossSystem = pkgsNative.lib.systems.examples.x86_64-darwin;
+  };
+  pkgsWin = import sources.nixpkgs {
+    crossSystem = pkgsNative.lib.systems.examples.mingw32;
+  };
+
+  pkgsTest = import sources.nixpkgs {
+    crossSystem = pkgsNative.lib.systems.examples.aarch64-multiplatform;
+  };
+
+  linux = project { pkgs = pkgsLinux; };
+  mac = project { pkgs = pkgsMac; };
+  win = project { pkgs = pkgsWin; };
+  test = project { pkgs = pkgsTest; };
+in {
+  elm-format-linux = linux.elm-format.components.exes.elm-format;
+  #elm-format-mac = mac.elm-format.components.exes.elm-format;
+  #elm-format-win = win.elm-format.components.exes.elm-format;
+  elm-format-test = test.elm-format.components.exes.elm-format;
+}
diff --git a/shell.nix b/shell.nix
index 6ea788c34..bd583a4cd 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,13 +1,16 @@
 { sources ? import nix/sources.nix, pkgs ? import sources.nixpkgs { } }:
 let
+  project = import ./default.nix { sources = sources; };
   niv = import sources.niv { };
+  haskellNix = import sources.haskellNix { };
+in project.shellFor {
+  # packages = p: [ ];
+
+  tools = { cabal = "latest"; };
+  #exactDeps = true;
 
-  haskellPackages = pkgs.haskell.packages.ghc901;
-in haskellPackages.shellFor {
-  packages = p: [ ];
   buildInputs = with pkgs; [
     # Tools required to build elm-format
-    cabal-install
     git
     python3
     jq
@@ -17,5 +20,6 @@ in haskellPackages.shellFor {
     cabal2nix
     niv.niv
     nixfmt
+    haskellNix.pkgs.haskell-nix.nix-tools.ghc901
   ];
 }