feat(rust) add bacon-ls and improve debugging

lua/lazyvim/plugins/extras/lang/rust.lua

@@ -1,3 +1,13 @@
+if lazyvim_docs then
+  -- LSP Server to use for Rust.
+  -- Set to "bacon-ls" to use bacon-ls instead of rust-analyzer.
+  -- only for diagnostics. The rest of LSP support will still be
+  -- provided by rust-analyzer.
+  vim.g.lazyvim_rust_diagnostics = "rust-analyzer"
+end
+
+local diagnostics = vim.g.lazyvim_rust_diagnostics or "rust-analyzer"
+
 return {
   recommended = function()
     return LazyVim.extras.wants({
@@ -37,7 +47,13 @@ return {
   {
     "williamboman/mason.nvim",
     optional = true,
-    opts = { ensure_installed = { "codelldb" } },
+    opts = function(_, opts)
+      opts.ensure_installed = opts.ensure_installed or {}
+      vim.list_extend(opts.ensure_installed, { "codelldb" })
+      if diagnostics == "bacon-ls" then
+        vim.list_extend(opts.ensure_installed, { "bacon", "bacon-ls" })
+      end
+    end
   },
 
   {
@@ -64,8 +80,14 @@ return {
                 enable = true,
               },
             },
-            -- Add clippy lints for Rust.
+            -- Add clippy lints for Rust if using rust-analyzer
-            checkOnSave = true,
+            checkOnSave = {
+              enable = diagnostics == "rust-analyzer",
+            },
+            -- Enable diagnostics if using rust-analyzer
+            diagnostics = {
+              enable = diagnostics == "rust-analyzer",
+            },
             procMacro = {
               enable = true,
               ignored = {
@@ -79,6 +101,14 @@ return {
       },
     },
     config = function(_, opts)
+      -- Configure dap with codelldb
+      local package_path = require("mason-registry").get_package("codelldb"):get_install_path()
+      opts.dap = {
+        adapter = require("rustaceanvim.config").get_codelldb_adapter(
+          package_path .. "/codelldb",
+          package_path .. "/extension/lldb/lib/liblldb.dylib"
+        ),
+      }
       vim.g.rustaceanvim = vim.tbl_deep_extend("keep", vim.g.rustaceanvim or {}, opts or {})
       if vim.fn.executable("rust-analyzer") == 0 then
         LazyVim.error(
@@ -94,6 +124,9 @@ return {
     "neovim/nvim-lspconfig",
     opts = {
       servers = {
+        bacon_ls = {
+          enabled = diagnostics == "bacon-ls",
+        },
         taplo = {
           keys = {
             {