plugins/roslyn: init module

https://github.com/seblyng/roslyn.nvim

plugins/by-name/roslyn/default.nix

@@ -0,0 +1,28 @@
+{ config, lib, ... }:
+lib.nixvim.plugins.mkNeovimPlugin {
+  name = "roslyn";
+  package = "roslyn-nvim";
+
+  dependencies = [
+    "roslyn_ls"
+  ];
+
+  maintainers = [ lib.maintainers.khaneliman ];
+
+  extraConfig = {
+    warnings = lib.nixvim.mkWarnings "plugins.roslyn" {
+      when = config.lsp.servers.roslyn_ls.enable;
+
+      message = ''
+        You have enabled both `lsp.servers.roslyn_ls` and `plugins.roslyn`.
+        This causes duplicate lsps to attach to the buffer. It is recommended to disable one.
+      '';
+    };
+  };
+
+  settingsExample = {
+    broad_search = true;
+    lock_target = true;
+    silent = true;
+  };
+}

tests/test-sources/plugins/by-name/roslyn/default.nix

@@ -0,0 +1,27 @@
+{
+  empty = {
+    # TODO: 2025-10-03
+    # Transient dependency `vmr` has a build failure
+    # https://github.com/NixOS/nixpkgs/issues/431811
+    dependencies.roslyn_ls.enable = false;
+    plugins.roslyn.enable = true;
+  };
+
+  defaults = {
+    # TODO: 2025-10-03
+    # Transient dependency `vmr` has a build failure
+    # https://github.com/NixOS/nixpkgs/issues/431811
+    dependencies.roslyn_ls.enable = false;
+    plugins.roslyn = {
+      enable = true;
+      settings = {
+        filewatching = "auto";
+        choose_target = null;
+        ignore_target = null;
+        broad_search = false;
+        lock_target = false;
+        silent = false;
+      };
+    };
+  };
+}