purty: drop the purty hook

purty has been removed from nixpkgs due to lack of maintenance.
Consider using `purs-tidy` instead.

Author: sandydoo

README.md

@@ -415,7 +415,6 @@ use nix
 ### Purescript
 
 - [purs-tidy](https://github.com/natefaubion/purescript-tidy)
-- [purty](https://gitlab.com/joneshf/purty)
 
 ### Python
 

modules/hooks.nix

@@ -3773,14 +3773,6 @@ lib.escapeShellArgs (lib.concatMap (ext: [ "--ghc-opt" "-X${ext}" ]) hooks.fourm
           entry = "${hooks.purs-tidy.package}/bin/purs-tidy format-in-place";
           files = "\\.purs$";
         };
-      purty =
-        {
-          name = "purty";
-          description = "Format purescript files.";
-          package = tools.purty;
-          entry = "${hooks.purty.package}/bin/purty";
-          files = "\\.purs$";
-        };
       pylint =
         {
           name = "pylint";

modules/pre-commit.nix

@@ -431,6 +431,13 @@ in
     };
 
   config = lib.mkIf cfg.enable {
+    # Hook removal notices should be defined here
+    assertions = [
+      {
+        assertion = !(cfg.hooks ? purty);
+        message = "The `purty` hook has been removed because the project is unmaintained. Consider using `purs-tidy` instead.";
+      }
+    ];
 
     rawConfig =
       {

nix/purty/default.nix

@@ -232,7 +232,6 @@ in
   cabal2nix-dir = callPackage ./cabal2nix-dir { };
   hpack-dir = callPackage ./hpack-dir { };
   hunspell = callPackage ./hunspell { };
-  purty = callPackage ./purty { purty = nodePackages.purty; };
   terraform-validate = callPackage ./terraform-validate { };
   tflint = callPackage ./tflint { };
   dune-build-opam-files = callPackage ./dune-build-opam-files {