Major lsp overhaul. Use new 0.11+ apis, remove lspconfig, remove lots of

mason/lspconfig util plugins. Currently supports following lsps: gopls,
clangd, lua-language-server, cmake-language-server

home/.config/nvim/lua/language_servers/clangd.lua

@@ -1,9 +1,9 @@
-local util = require "lspconfig.util"
+local utils = require("utils")
 
 -- https://clangd.llvm.org/extensions.html#switch-between-sourceheader
 local function switch_source_header(bufnr)
-    bufnr = util.validate_bufnr(bufnr)
-    local clangd_client = util.get_active_client_by_name(bufnr, "clangd")
+    bufnr = utils.validate_bufnr(bufnr)
+    local clangd_client = vim.lsp.get_clients({ bufnr = bufnr, name = "clangd" })[1]
     local params = { uri = vim.uri_from_bufnr(bufnr) }
     if clangd_client then
         clangd_client.request("textDocument/switchSourceHeader", params, function(err, result)
@@ -21,66 +21,6 @@ local function switch_source_header(bufnr)
     end
 end
 
-local function symbol_info()
-    local bufnr = vim.api.nvim_get_current_buf()
-    local clangd_client = util.get_active_client_by_name(bufnr, "clangd")
-    if not clangd_client or not clangd_client.supports_method "textDocument/symbolInfo" then
-        return vim.notify("Clangd client not found", vim.log.levels.ERROR)
-    end
-    local params = vim.lsp.util.make_position_params()
-    clangd_client.request("textDocument/symbolInfo", params, function(err, res)
-        if err or #res == 0 then
-            -- Clangd always returns an error, there is not reason to parse it
-            return
-        end
-        local container = string.format("container: %s", res[1].containerName) ---@type string
-        local name = string.format("name: %s", res[1].name) ---@type string
-        vim.lsp.util.open_floating_preview({ name, container }, "", {
-            height = 2,
-            width = math.max(string.len(name), string.len(container)),
-            focusable = false,
-            focus = false,
-            border = require("lspconfig.ui.windows").default_options.border or "single",
-            title = "Symbol Info",
-        })
-    end, bufnr)
-end
-
-local lsp_maps = {
-    {
-        "<leader>ko",
-        function() switch_source_header(0) end,
-    },
-    {
-        "K",
-        symbol_info,
-    }
-}
-local keymaps = { n = {} }
-for i, _ in ipairs(lsp_maps) do
-    local binding, cmd = unpack(lsp_maps[i])
-    keymaps.n[binding] = { cmd = cmd }
-end
-require("utils").add_keymaps(keymaps)
-
-local root_files = {
-    ".clangd",
-    ".clang-tidy",
-    ".clang-format",
-    "compile_commands.json",
-    "compile_flags.txt",
-    "configure.ac", -- AutoTools
-}
-
-local default_capabilities = {
-    textDocument = {
-        completion = {
-            editsNearCursor = true,
-        },
-    },
-    offsetEncoding = { "utf-16" },
-}
-
 return {
     cmd = {
         "clangd",
@@ -96,26 +36,27 @@ return {
         "--log=error",                -- Log only errors
     },
     filetypes = { "c", "cpp", "objc", "objcpp", "cuda", "proto" },
-    root_dir = function(fname)
-        return util.root_pattern(unpack(root_files))(fname) or util.find_git_ancestor(fname)
-    end,
-    single_file_support = true,
-    capabilities = default_capabilities,
-    docs = {
-        description = [[
-https://clangd.llvm.org/installation.html
-
-- **NOTE:** Clang >= 11 is recommended! See [#23](https://github.com/neovim/nvim-lsp/issues/23).
-- If `compile_commands.json` lives in a build directory, you should
-  symlink it to the root of your source tree.
-    ln -s /path/to/myproject/build/compile_commands.json /path/to/myproject/
-- clangd relies on a [JSON compilation database](https://clang.llvm.org/docs/JSONCompilationDatabase.html)
-specified as compile_commands.json, see https://clangd.llvm.org/installation#compile_commandsjson
-]],
-        default_config = {
-            root_dir =
-            [[      root_pattern(        ".clangd",        ".clang-tidy",        ".clang-format",        "compile_commands.json",        "compile_flags.txt",        "configure.ac",        ".git"      )    ]],
-            capabilities = [[default capabilities, with offsetEncoding utf-8]],
-        },
+    root_markers = {
+        ".clangd",
+        ".clang-tidy",
+        ".clang-format",
+        "compile_commands.json",
+        "compile_flags.txt",
+        "configure.ac",
     },
+    on_attach = function(_, bufnr)
+        local lsp_maps = {
+            {
+                "<leader>ko",
+                function() switch_source_header(0) end,
+            },
+        }
+
+        local keymaps = { n = {} }
+        for i, _ in ipairs(lsp_maps) do
+            local binding, cmd = unpack(lsp_maps[i])
+            keymaps.n[binding] = { cmd = cmd, opts = { buffer = bufnr } }
+        end
+        utils.add_keymaps(keymaps)
+    end,
 }