dkelly-neovim/lua/dkelly/plugins/lsp/lspconfig.lua

return {
	"neovim/nvim-lspconfig",
	event = { "BufReadPre", "BufNewFile" },
	dependencies = {
		"hrsh7th/cmp-nvim-lsp",
		{ "antosha417/nvim-lsp-file-operations", config = true },
		{ "folke/neodev.nvim", opts = {} },
	},
	config = function()
		-- import lspconfig plugin
		local lspconfig = require("lspconfig")
		lspconfig.util.default_config = vim.tbl_extend("force", lspconfig.util.default_config, {
			capabilities = vim.tbl_deep_extend(
				"force",
				vim.lsp.protocol.make_client_capabilities(),
				require("lsp-file-operations").default_capabilities()
			),
		})
		lspconfig.dartls.setup({})
		-- import cmp-nvim-lsp plugin
		local cmp_nvim_lsp = require("cmp_nvim_lsp")

		local keymap = vim.keymap -- for conciseness

		vim.api.nvim_create_autocmd("LspAttach", {
			group = vim.api.nvim_create_augroup("UserLspConfig", {}),
			callback = function(ev)
				-- Buffer local mappings.
				-- See `:help vim.lsp.*` for documentation on any of the below functions
				local opts = { buffer = ev.buf, silent = true }

				-- set keybinds
				opts.desc = "Show LSP references"
				keymap.set("n", "gR", "<cmd>Telescope lsp_references<CR>", opts) -- show definition, references

				opts.desc = "Go to declaration"
				keymap.set("n", "gD", vim.lsp.buf.declaration, opts) -- go to declaration

				opts.desc = "Show LSP definitions"
				keymap.set("n", "gd", "<cmd>Telescope lsp_definitions<CR>", opts) -- show lsp definitions

				opts.desc = "Show LSP implementations"
				keymap.set("n", "gi", "<cmd>Telescope lsp_implementations<CR>", opts) -- show lsp implementations

				opts.desc = "Show LSP type definitions"
				keymap.set("n", "gt", "<cmd>Telescope lsp_type_definitions<CR>", opts) -- show lsp type definitions

				opts.desc = "See available code actions"
				keymap.set({ "n", "v" }, "<leader>cz", vim.lsp.buf.code_action, opts) -- see available code actions, in visual mode will apply to selection

				opts.desc = "Smart rename"
				keymap.set("n", "<leader>rn", vim.lsp.buf.rename, opts) -- smart rename

				opts.desc = "Show buffer diagnostics"
				keymap.set("n", "<leader>D", "<cmd>Telescope diagnostics bufnr=0<CR>", opts) -- show  diagnostics for file

				opts.desc = "Show line diagnostics"
				keymap.set("n", "<leader>d", vim.diagnostic.open_float, opts) -- show diagnostics for line

				opts.desc = "Go to previous diagnostic"
				keymap.set("n", "[d", vim.diagnostic.goto_prev, opts) -- jump to previous diagnostic in buffer

				opts.desc = "Go to next diagnostic"
				keymap.set("n", "]d", vim.diagnostic.goto_next, opts) -- jump to next diagnostic in buffer

				opts.desc = "Show documentation for what is under cursor"
				keymap.set("n", "K", vim.lsp.buf.hover, opts) -- show documentation for what is under cursor

				opts.desc = "Restart LSP"
				keymap.set("n", "<leader>rs", ":LspRestart<CR>", opts) -- mapping to restart lsp if necessary
			end,
		})

		local capabilities = vim.tbl_deep_extend(
			"force",
			cmp_nvim_lsp.default_capabilities(),
			require("lsp-file-operations").default_capabilities()
		)
		local on_attach = function(client, bufnr)
			-- Enable completion triggered by <C-x><C-o>
			vim.bo[bufnr].omnifunc = "v:lua.vim.lsp.omnifunc"

			-- Define key mappings for LSP functionality
			local opts = { noremap = true, silent = true, buffer = bufnr }
			vim.keymap.set("n", "gd", vim.lsp.buf.definition, opts)
			vim.keymap.set("n", "K", vim.lsp.buf.hover, opts)
			vim.keymap.set("n", "gi", vim.lsp.buf.implementation, opts)
			vim.keymap.set("n", "<C-k>", vim.lsp.buf.signature_help, opts)
			vim.keymap.set("n", "<leader>rn", vim.lsp.buf.rename, opts)
			vim.keymap.set("n", "<leader>ca", vim.lsp.buf.code_action, opts)
			vim.keymap.set("n", "gr", vim.lsp.buf.references, opts)
			vim.keymap.set("n", "<leader>fr", function()
				vim.lsp.buf.format({ async = true })
			end, opts)

			-- Additional client-specific setup
			if client.server_capabilities.document_highlight then
				vim.api.nvim_create_augroup("LspDocumentHighlight", { clear = true })
				vim.api.nvim_create_autocmd("CursorHold", {
					group = "LspDocumentHighlight",
					buffer = bufnr,
					callback = vim.lsp.buf.document_highlight,
				})
				vim.api.nvim_create_autocmd("CursorMoved", {
					group = "LspDocumentHighlight",
					buffer = bufnr,
					callback = vim.lsp.buf.clear_references,
				})
			end
		end
		-- Change the Diagnostic symbols in the sign column (gutter)
		-- (not in youtube nvim video)
		local signs = { Error = " ", Warn = " ", Hint = "󰠠 ", Info = " " }
		for type, icon in pairs(signs) do
			local hl = "DiagnosticSign" .. type
			vim.fn.sign_define(hl, { text = icon, texthl = hl, numhl = "" })
		end

		require("mason-lspconfig").setup({
			ensure_installed = {
				"lua_ls",
				"rust_analyzer",
				"gopls",
			},
			handlers = {
				function(server_name) -- default handler (optional)
					require("lspconfig")[server_name].setup({
						capabilities = capabilities,
					})
				end,

				zls = function()
					local lspconfig = require("lspconfig")
					lspconfig.zls.setup({
						root_dir = lspconfig.util.root_pattern(".git", "build.zig", "zls.json"),
						settings = {
							zls = {
								enable_inlay_hints = true,
								enable_snippets = true,
								warn_style = true,
							},
						},
					})
					vim.g.zig_fmt_parse_errors = 0
					vim.g.zig_fmt_autosave = 0
				end,
				["lua_ls"] = function()
					local lspconfig = require("lspconfig")
					lspconfig.lua_ls.setup({
						capabilities = capabilities,
						settings = {
							Lua = {
								format = {
									enable = true,
									-- Put format options here
									-- NOTE: the value should be STRING!!
									defaultConfig = {
										indent_style = "space",
										indent_size = "2",
									},
								},
							},
						},
					})
				end,
				["gopls"] = function()
					lspconfig.gopls.setup({
						on_attach = on_attach,
						capabilities = capabilities,
						cmd = { "gopls" },
						filetypes = { "go", "gomod", "gowork", "gotmpl" },
						root_dir = lspconfig.util.root_pattern("go.work", "go.mod", ".git"),
						settings = {
							gopls = {
								completeUnimported = true,
								usePlaceholder = true,
								analyses = {
									unusedparams = true,
								},
							},
						},
					})
				end,
			},
		})
	end,
}