config.nvim/lua/plugins/lsp.lua

-- Global mappings.
-- See `:help vim.diagnostic.*` for documentation on any of the below functions
vim.keymap.set('n', '<space>e', vim.diagnostic.open_float)
vim.keymap.set('n', '[d', vim.diagnostic.goto_prev)
vim.keymap.set('n', ']d', vim.diagnostic.goto_next)

-- Use LspAttach autocommand to only map the following keys
-- after the language server attaches to the current buffer
vim.api.nvim_create_autocmd('LspAttach', {
	group = vim.api.nvim_create_augroup('UserLspConfig', {}),
	callback = function(ev)
		-- Enable completion triggered by <c-x><c-o>
		vim.bo[ev.buf].omnifunc = 'v:lua.vim.lsp.omnifunc'

		-- Buffer local mappings.
		-- See `:help vim.lsp.*` for documentation on any of the below functions
		local opts = { buffer = ev.buf }
		vim.keymap.set('n', 'gD', vim.lsp.buf.declaration, opts)
		vim.keymap.set('n', '<leader>K', vim.lsp.buf.hover, opts)
		vim.keymap.set({ 'n', 'i' }, '<C-k>', vim.lsp.buf.signature_help, opts)
		vim.keymap.set('n', '<leader>wa', vim.lsp.buf.add_workspace_folder, opts)
		vim.keymap.set('n', '<leader>wr', vim.lsp.buf.remove_workspace_folder, opts)
		vim.keymap.set('n', '<leader>wl', function()
			print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
		end, opts)
		vim.keymap.set('n', '<leader>rn', vim.lsp.buf.rename, opts)
		vim.keymap.set({ 'n', 'v' }, '<leader>ca', vim.lsp.buf.code_action, opts)
		vim.keymap.set('n', '<leader>fm', function()
			vim.lsp.buf.format { async = true }
		end, opts)
		vim.keymap.set("n", "<leader>gr", vim.lsp.buf.references, opts)
		vim.keymap.set('n', '<leader>D', vim.lsp.buf.type_definition, opts)
		vim.keymap.set('n', 'gd', vim.lsp.buf.definition, opts)
		vim.keymap.set('n', '<leader>gi', vim.lsp.buf.implementation, opts)
	end,
})

require("mason").setup { ui = { icons = { package_installed = "✓" } } }
require("mason-lspconfig").setup {}
-- Dynamic loading of lsp servers
require("mason-lspconfig").setup_handlers {
	-- The first entry (without a key) will be the default handler
	-- and will be called for each installed server that doesn't have
	-- a dedicated handler.
	function(server_name) -- default handler (optional)
		require("lspconfig")[server_name].setup {}
	end,
	-- Next, you can provide targeted overrides for specific servers.
	-- For example, a handler override for the `rust_analyzer`:
	["rust_analyzer"] = function() require("rust-tools").setup {} end
}

-- customize lsp symbols
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 = nil })
end