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")

		-- import mason_lspconfig plugin
		local mason_lspconfig = require("mason-lspconfig")

		-- 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,
		})

		-- used to enable autocompletion (assign to every lsp server config)
		local capabilities = cmp_nvim_lsp.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>f", 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

		mason_lspconfig.setup_handlers({
			-- default handler for installed servers
			function(server_name)
				lspconfig[server_name].setup({
					capabilities = capabilities,
				})
			end,
			["lua_ls"] = function()
				-- configure lua server (with special settings)
				lspconfig["lua_ls"].setup({
					capabilities = capabilities,
					settings = {
						Lua = {
							-- make the language server recognize "vim" global
							diagnostics = {
								globals = { "vim" },
							},
							completion = {
								callSnippet = "Replace",
							},
						},
					},
				})
			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,
}