plugins.lsp: automatically remove unsupported servers

A new update script will check which "old" files do not have an
equivalent "new" file, then the plugins.lsp module will create a
removal assertion for any servers that are listed in the generated
file.

ci/generate.nix

@@ -51,6 +51,7 @@ writeShellApplication {
 
     generate_json "${conform-formatters}" "conform-formatters"
     generate_json "${lspconfig-servers}" "lspconfig-servers"
+    generate_json "${lspconfig-servers.unsupported}" "unsupported-lspconfig-servers"
 
     if [ -n "$commit" ]; then
       cd "$generated_dir"

ci/nvim-lspconfig/default.nix

@@ -1,5 +1,6 @@
 {
   lib,
+  callPackage,
   vimPlugins,
   neovimUtils,
   wrapNeovimUnstable,
@@ -31,6 +32,7 @@ runCommand "lspconfig-servers"
       pandoc
       python3
     ];
+    passthru.unsupported = callPackage ./unsupported.nix { };
   }
   ''
     export HOME=$(realpath .)

ci/nvim-lspconfig/unsupported.nix

@@ -0,0 +1,24 @@
+{
+  runCommand,
+  jq,
+  vimPlugins,
+}:
+/**
+  Produces a JSON array of all nvim-lspconfig server configs that don't yet
+  support the new system.
+
+  I.e., files in the old `lua/lspconfig/configs/` directory, that aren't
+  present in the new `lsp/` directory.
+*/
+runCommand "unsupported-lspconfig-servers"
+  {
+    nativeBuildInputs = [ jq ];
+    lspconfig = vimPlugins.nvim-lspconfig;
+  }
+  ''
+    for file in "$lspconfig"/lua/lspconfig/configs/*.lua
+    do
+      name=$(basename --suffix=.lua "$file")
+      [ -f "$lspconfig"/lsp/"$name".lua ] || echo "$name"
+    done | jq --raw-input . | jq --slurp [.] > "$out"
+  ''

generated/unsupported-lspconfig-servers.json

@@ -0,0 +1,16 @@
+[
+  "bitbake_ls",
+  "bqnlsp",
+  "cadence",
+  "clarity_lsp",
+  "codeqlls",
+  "delphi_ls",
+  "drools_lsp",
+  "haxe_language_server",
+  "openedge_ls",
+  "pkgbuild_language_server",
+  "relay_lsp",
+  "sourcery",
+  "vdmj",
+  "vuels"
+]

plugins/lsp/language-servers/default.nix

@@ -212,7 +212,26 @@ in
   imports =
     let
       mkLsp = import ./_mk-lsp.nix;
-      lspModules = map mkLsp generatedServers;
+      mkUnsupportedLsp =
+        {
+          name,
+          serverName ? name,
+          ...
+        }:
+        lib.mkRemovedOptionModule [ "plugins" "lsp" "servers" name ] ''
+          nvim-lspconfig has switched from its own LSP configuration API to neovim's built-in LSP API.
+          '${serverName}' has not been updated to support neovim's built-in LSP API.
+          See https://github.com/neovim/nvim-lspconfig/issues/3705
+        '';
+      unsupported = lib.importJSON ../../../generated/unsupported-lspconfig-servers.json;
+      lspModules = map (
+        {
+          name,
+          serverName ? name,
+          ...
+        }@lsp:
+        (if lib.elem serverName unsupported then mkUnsupportedLsp else mkLsp) lsp
+      ) generatedServers;
       baseLspPath = [
         "plugins"
         "lsp"

tests/lsp-servers.nix

@@ -1,11 +1,14 @@
 {
+  lib,
   nixvimConfiguration,
   name ? "lsp-all-servers",
 }:
 let
   _file = ./lsp-servers.nix;
 
-  renamed = builtins.attrNames (import ../plugins/lsp/language-servers/_renamed.nix);
+  unsupported =
+    builtins.attrNames (import ../plugins/lsp/language-servers/_renamed.nix)
+    ++ lib.importJSON ../generated/unsupported-lspconfig-servers.json;
 
   enable-lsp-module = {
     inherit _file;
@@ -63,7 +66,7 @@ let
             package = null;
           }
         ))
-        (lib.filterAttrs (server: _: !(lib.elem server renamed)))
+        (lib.filterAttrs (server: _: !(lib.elem server unsupported)))
       ];
 
       # TODO 2025-10-01