From 9834eb33242e7c24b35e15877fc7ef1ac0e6e90f Mon Sep 17 00:00:00 2001
From: Snoweuph <snow@euph.email>
Date: Sun, 1 Feb 2026 08:59:16 +0100
Subject: [PATCH] lsp/harper-ls: add config option for filetypes

---
 docs/manual/release-notes/rl-0.9.md         |  3 ++
 modules/plugins/lsp/harper-ls/config.nix    |  3 +-
 modules/plugins/lsp/harper-ls/harper-ls.nix | 43 ++++++++++++++++++++-
 3 files changed, 47 insertions(+), 2 deletions(-)

diff --git a/docs/manual/release-notes/rl-0.9.md b/docs/manual/release-notes/rl-0.9.md
index 651f9f4e..42e708d4 100644
--- a/docs/manual/release-notes/rl-0.9.md
+++ b/docs/manual/release-notes/rl-0.9.md
@@ -174,6 +174,9 @@
 
 - Added Makefile support via `languages.make`.
 
+- Added config option to [harper-ls](https://github.com/Automattic/harper) to
+  limit it to supported filetypes.
+
 [vagahbond](https://github.com/vagahbond): [codewindow.nvim]:
 https://github.com/gorbit99/codewindow.nvim
 
diff --git a/modules/plugins/lsp/harper-ls/config.nix b/modules/plugins/lsp/harper-ls/config.nix
index d6e27bfc..2f12bea3 100644
--- a/modules/plugins/lsp/harper-ls/config.nix
+++ b/modules/plugins/lsp/harper-ls/config.nix
@@ -11,9 +11,10 @@
 in {
   config = mkIf (cfg.enable && cfg.harper-ls.enable) {
     vim.lsp.servers.harper-ls = {
-      root_markers = [".git"];
+      root_markers = [".git" ".harper-dictionary.txt"];
       cmd = [(getExe pkgs.harper) "--stdio"];
       settings = {harper-ls = cfg.harper-ls.settings;};
+      filetypes = cfg.harper-ls.filetypes;
     };
   };
 }
diff --git a/modules/plugins/lsp/harper-ls/harper-ls.nix b/modules/plugins/lsp/harper-ls/harper-ls.nix
index 9fab45fe..4522fea6 100644
--- a/modules/plugins/lsp/harper-ls/harper-ls.nix
+++ b/modules/plugins/lsp/harper-ls/harper-ls.nix
@@ -1,6 +1,6 @@
 {lib, ...}: let
   inherit (lib.options) mkOption mkEnableOption;
-  inherit (lib.types) anything attrsOf;
+  inherit (lib.types) anything attrsOf nullOr listOf str;
 in {
   options.vim.lsp.harper-ls = {
     enable = mkEnableOption "Harper grammar checking LSP";
@@ -31,5 +31,46 @@ in {
       };
       description = "Settings to pass to harper-ls";
     };
+    filetypes = mkOption {
+      type = nullOr (listOf str);
+      # <https://writewithharper.com/docs/integrations/language-server#Supported-Languages>
+      default = [
+        "asciidoc"
+        "c"
+        "clojure"
+        "cmake"
+        "cpp"
+        "cs"
+        "daml"
+        "dart"
+        "gitcommit"
+        "go"
+        "haskell"
+        "html"
+        "ink"
+        "java"
+        "javascript"
+        "javascriptreact"
+        "kotlin"
+        "lhaskell"
+        "lua"
+        "mail"
+        "markdown"
+        "nix"
+        "php"
+        "python"
+        "ruby"
+        "rust"
+        "scala"
+        "sh"
+        "swift"
+        "text"
+        "toml"
+        "typescript"
+        "typescriptreact"
+        "typst"
+      ];
+      description = "Filetypes to auto-attach LSP server in";
+    };
   };
 }