feat(LazyVim): introduce global clang-format config

I use the .clang-format file of the linux kernel repo, and put it
directly into home.
This affects both clang-format and clangd. It affects the lazyvim
lang.clangd extra and my user level lang.opencl extra.
Though for OpenCl I explicitly specified the the format file with the
--style flag.

home/.chezmoiexternals/global_clang-format_config.json

@@ -0,0 +1,7 @@
+{
+  ".clang-format": {
+    "type": "file",
+    "url": "https://raw.githubusercontent.com/torvalds/linux/master/.clang-format",
+    "refreshPeriod": "168h"
+  }
+}

home/dot_config/nvim/lua/plugins/extras/lang/opencl.lua

@@ -1,36 +1,47 @@
-return {
-	{
-		"brgmnn/vim-opencl",
-	}, -- NOTE: Contains OpenCL file detection autocommand
-	{
-		"neovim/nvim-lspconfig",
-		opts = {
-			setup = {
-				opencl_ls = function()
-					require("lspconfig").opencl_ls.setup({})
-				end,
+if not vim.g.vscode then
+	local psep = package.config:sub(1, 1) -- Directory path separator on platform
+
+	return {
+		{
+			"brgmnn/vim-opencl", -- For syntax highlighting
+			lazy = false,
+		}, -- NOTE: Contains OpenCL file detection autocommand
+		{
+			"neovim/nvim-lspconfig",
+			opts = {
+				setup = {
+					opencl_ls = function()
+						require("lspconfig").opencl_ls.setup({})
+					end,
+				},
 			},
 		},
-	},
-	{
-		"williamboman/mason.nvim",
-		opts = function(_, opts)
-			table.insert(opts.ensure_installed, "clang-format")
-		end,
-	},
-	{
-		"stevearc/conform.nvim",
-		opts = {
-			formatters_by_ft = {
-				["opencl"] = { "clang-format" },
-			},
-			formatters = {
-				["clang-format"] = {
-					args = {
-						"--style={BasedOnStyle: chromium, IndentWidth: 8}",
+		{
+			"williamboman/mason.nvim",
+			opts = function(_, opts)
+				table.insert(opts.ensure_installed, "clang-format")
+			end,
+		},
+		{
+			"stevearc/conform.nvim",
+			opts = {
+				formatters_by_ft = {
+					["opencl"] = { "clang-format" },
+				},
+				formatters = {
+					["clang-format"] = {
+						args = {
+							"--fallback-style=Chromium",
+							"--style=file:"
+								.. vim.env.HOME
+								.. psep
+								.. ".clang-format",
+						},
 					},
 				},
 			},
 		},
-	},
-}
+	}
+else
+	return {}
+end