Add keep-sorted (#631)

Co-authored-by: sander <hey@sandydoo.me>

Author: dwoffinden

README.md

@@ -504,6 +504,7 @@ use nix
 - [fix-byte-order-marker](https://github.com/pre-commit/pre-commit-hooks/blob/main/pre_commit_hooks/fix_byte_order_marker.py)
 - [headache](https://github.com/frama-c/headache)
 - [hledger-fmt](https://github.com/mondeja/hledger-fmt)
+- [keep-sorted](https://github.com/google/keep-sorted)
 - [mixed-line-endings](https://github.com/pre-commit/pre-commit-hooks/blob/main/pre_commit_hooks/mixed_line_ending.py)
 - [mkdocs-linkcheck](https://github.com/byrnereese/linkchecker-mkdocs)
 - [openapi-spec-validator](https://github.com/python-openapi/openapi-spec-validator)

modules/hooks.nix

@@ -3209,6 +3209,14 @@ lib.escapeShellArgs (lib.concatMap (ext: [ "--ghc-opt" "-X${ext}" ]) hooks.fourm
             end'
           '';
         };
+      keep-sorted =
+        {
+          name = "keep-sorted";
+          description = "Language-agnostic formatter that sorts lines between two markers in a larger file.";
+          types = [ "text" ];
+          package = tools.keep-sorted;
+          entry = "${hooks.keep-sorted.package}/bin/keep-sorted";
+        };
       latexindent =
         {
           name = "latexindent";

nix/tools.nix

@@ -44,6 +44,7 @@
 , hlint
 , hpack
 , html-tidy
+, keep-sorted
 , luaPackages
 , lua-language-server
 , lychee
@@ -154,6 +155,7 @@ in
     hlint
     hpack
     html-tidy
+    keep-sorted
     lychee
     mdformat
     mdl