From f4423f18abc94efb8a95a4bb06b8e2773d0404e9 Mon Sep 17 00:00:00 2001
From: CaueAnjos <141049846+CaueAnjos@users.noreply.github.com>
Date: Fri, 17 Apr 2026 13:32:47 -0300
Subject: [PATCH] lsp/presets/csharp_ls: int

---
 modules/plugins/lsp/presets/csharp_ls.nix | 51 +++++++++++++++++++++++
 modules/plugins/lsp/presets/default.nix   |  1 +
 2 files changed, 52 insertions(+)
 create mode 100644 modules/plugins/lsp/presets/csharp_ls.nix

diff --git a/modules/plugins/lsp/presets/csharp_ls.nix b/modules/plugins/lsp/presets/csharp_ls.nix
new file mode 100644
index 00000000..ba0238f5
--- /dev/null
+++ b/modules/plugins/lsp/presets/csharp_ls.nix
@@ -0,0 +1,51 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  inherit (lib.meta) getExe;
+  inherit (lib.modules) mkIf;
+  inherit (lib.nvim.types) mkLspPresetEnableOption;
+  inherit (lib.generators) mkLuaInline;
+
+  cfg = config.vim.lsp.presets.csharp_ls;
+in {
+  # HACK: this server should be named `csharp-ls`, but the extension `csharpls-extended-lsp-nvim` only works if it is named `csharp_ls`
+  options.vim.lsp.presets.csharp_ls = {
+    enable = mkLspPresetEnableOption "csharp_ls" "C#" [];
+  };
+
+  config = mkIf cfg.enable {
+    vim.lsp.servers.csharp_ls = {
+      cmd = mkLuaInline ''
+        function(dispatchers, config)
+           return vim.lsp.rpc.start({ '${getExe pkgs.csharp-ls}', '--features', 'razor-support' , '--features', 'metadata-uris'}, dispatchers, {
+            -- csharp-ls attempt to locate sln, slnx or csproj files from cwd, so set cwd to root directory.
+            -- If cmd_cwd is provided, use it instead.
+            cwd = config.cmd_cwd or config.root_dir,
+            env = config.cmd_env,
+            detached = config.detached,
+          })
+        end
+      '';
+      root_dir = mkLuaInline ''
+        function(bufnr, on_dir)
+           local fname = vim.api.nvim_buf_get_name(bufnr)
+           on_dir(util.root_pattern '*.sln'(fname) or util.root_pattern '*.slnx'(fname) or util.root_pattern '*.csproj'(fname))
+         end
+      '';
+      init_options = {
+        AutomaticWorkspaceInit = true;
+      };
+      get_language_id = mkLuaInline ''
+        function(_, ft)
+            if ft == 'cs' then
+              return 'csharp'
+            end
+            return ft
+          end
+      '';
+    };
+  };
+}
diff --git a/modules/plugins/lsp/presets/default.nix b/modules/plugins/lsp/presets/default.nix
index d3b0bed7..abd8346d 100644
--- a/modules/plugins/lsp/presets/default.nix
+++ b/modules/plugins/lsp/presets/default.nix
@@ -9,6 +9,7 @@
     ./ccls.nix
     ./clangd.nix
     ./clojure-lsp.nix
+    ./csharp_ls.nix
     ./cue.nix
     ./dart.nix
     ./deno.nix