fix(lsp): return config table from after/lsp specs (Neovim 0.12)

On Neovim 0.12 the `vim.lsp.config[name]` getter re-sources
after/lsp/<name>.lua and requires it to RETURN a table. The files used the
imperative setter form `vim.lsp.config('name', {...})` (which returns nil),
so mason-lspconfig automatic_enable -> vim.lsp.enable -> vim.lsp.config[name]
threw ".../after/lsp/ansiblels.lua: not a table" and aborted startup.

Convert all eight after/lsp specs to the declarative `return { ... }` form.
eslint keeps its EslintFixAll-on-save autocmd, now registered under a
clear=true augroup so re-sourcing during config resolution stays idempotent.

Fixes #36.

Author: Venkata Subramani Renduchintala

after/lsp/ansiblels.lua

@@ -1,4 +1,4 @@
-vim.lsp.config('ansiblels', {
+return {
   settings = {
     ansible = {
       ansible = {
@@ -19,4 +19,4 @@ vim.lsp.config('ansiblels', {
       },
     },
   },
-})
+}

after/lsp/eslint.lua

@@ -1,11 +1,9 @@
-vim.lsp.config('eslint', {
-  settings = {
-    packageManager = "npm",
-  },
-})
-
--- EslintFixAll on save, scoped to eslint-attached buffers only
+-- EslintFixAll on save, scoped to eslint-attached buffers only.
+-- Registered as a side effect when this config file is sourced; the augroup's
+-- clear = true keeps it idempotent if the file is sourced more than once.
+local group = vim.api.nvim_create_augroup("EslintFixOnSave", { clear = true })
 vim.api.nvim_create_autocmd("LspAttach", {
+  group = group,
   callback = function(args)
     local client = vim.lsp.get_client_by_id(args.data.client_id)
     if client and client.name == "eslint" then
@@ -16,3 +14,9 @@ vim.api.nvim_create_autocmd("LspAttach", {
     end
   end,
 })
+
+return {
+  settings = {
+    packageManager = "npm",
+  },
+}

after/lsp/gopls.lua

@@ -1,4 +1,5 @@
-vim.lsp.config('gopls', {
+-- Merged into the gopls config resolved by vim.lsp (Neovim 0.11+ native API).
+return {
   settings = {
     gopls = {
       analyses = {
@@ -9,4 +10,4 @@ vim.lsp.config('gopls', {
       gofumpt = true,
     },
   },
-})
+}

after/lsp/helm_ls.lua

@@ -1,4 +1,4 @@
-vim.lsp.config('helm_ls', {
+return {
   settings = {
     ['helm-ls'] = {
       logLevel = "info",
@@ -22,4 +22,4 @@ vim.lsp.config('helm_ls', {
       },
     },
   },
-})
+}

after/lsp/jsonnet_ls.lua

@@ -1,4 +1,4 @@
-vim.lsp.config('jsonnet_ls', {
+return {
   cmd = { "jsonnet-language-server", "-t" },
   settings = {
     ext_vars = {},
@@ -11,4 +11,4 @@ vim.lsp.config('jsonnet_ls', {
       SortImports = true,
     },
   },
-})
+}

after/lsp/lua_ls.lua

@@ -1,4 +1,4 @@
-vim.lsp.config('lua_ls', {
+return {
   settings = {
     Lua = {
       runtime = { version = "LuaJIT" },
@@ -7,4 +7,4 @@ vim.lsp.config('lua_ls', {
       telemetry = { enable = false },
     },
   },
-})
+}

after/lsp/rust_analyzer.lua

@@ -1,4 +1,4 @@
-vim.lsp.config('rust_analyzer', {
+return {
   settings = {
     ["rust-analyzer"] = {
       diagnostics = { enable = true },
@@ -10,4 +10,4 @@ vim.lsp.config('rust_analyzer', {
       procMacro = { enable = true },
     },
   },
-})
+}

after/lsp/yamlls.lua

@@ -1,4 +1,4 @@
-vim.lsp.config('yamlls', {
+return {
   settings = {
     yaml = {
       validate = true,
@@ -20,4 +20,4 @@ vim.lsp.config('yamlls', {
       },
     },
   },
-})
+}