plugins/lsp: add vls language server

plugins/lsp/language-servers/default.nix

@@ -510,6 +510,13 @@ with lib; let
       description = "Enable typst-lsp for typst";
       package = pkgs.typst-lsp;
     }
+    {
+      name = "vls";
+      description = "Enable vls for v";
+      # The v language server has to be installed from v and thus is not packaged "as is" in
+      # nixpkgs.
+      package = null;
+    }
     {
       name = "vuels";
       description = "Enable vuels, for Vue";
@@ -540,5 +547,6 @@ in {
       ./pylsp.nix
       ./rust-analyzer.nix
       ./svelte.nix
+      ./vls.nix
     ];
 }

plugins/lsp/language-servers/vls.nix

@@ -0,0 +1,28 @@
+{
+  lib,
+  config,
+  ...
+}:
+with lib; let
+  cfg = config.plugins.lsp.servers.vls;
+in {
+  options.plugins.lsp.servers.vls = {
+    autoSetFiletype = mkOption {
+      type = types.bool;
+      description = ''
+        Files with the `.v` extension are not automatically detected as vlang files.
+        If this option is enabled, Nixvim will automatically set  the filetype accordingly.
+      '';
+      default = true;
+      example = false;
+    };
+  };
+
+  config =
+    mkIf cfg.enable
+    {
+      filetype.extension =
+        mkIf cfg.autoSetFiletype
+        {v = "vlang";};
+    };
+}

tests/test-sources/plugins/lsp/nvim-lsp.nix

@@ -131,6 +131,7 @@
         texlab.enable = true;
         tsserver.enable = true;
         typst-lsp.enable = true;
+        vls.enable = true;
         vuels.enable = true;
         yamlls.enable = true;
         zls.enable = true;