return {
	{
		"neovim/nvim-lspconfig",
		lazy = true,
		config = function ()
			local lsp = require("lspconfig")
			lsp.pyright.setup{}
			-- lsp.jedi_language_server.setup{}
			lsp.rust_analyzer.setup({
				settings = {
					["rust-analyzer"] = {
						assist = {
							importGranularity = "module",
							importPrefix = "by_self",
						},
						cargo = {
							loadOutDirsFromCheck = true
						},
						procMacro = {
							enable = true
						},
					}
				}
			})
		end,
	},
	{
		"hrsh7th/nvim-cmp",
		dependencies = {
			"hrsh7th/cmp-nvim-lsp",
			"hrsh7th/cmp-buffer",
			"hrsh7th/cmp-path",
			"hrsh7th/cmp-cmdline",
		},
		config = function ()
			-- From vimrc, may need clean up
			local cmp = require("cmp")

			local has_words_before = function()
				local line, col = unpack(vim.api.nvim_win_get_cursor(0))
				return col ~= 0 and vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:sub(col, col):match("%s") == nil
			end

			cmp.setup({
				snippet = {
					-- REQUIRED - you must specify a snippet engine
					expand = function(args)
					-- vim.fn["vsnip#anonymous"](args.body) -- For `vsnip` users.
					-- require("luasnip").lsp_expand(args.body) -- For `luasnip` users.
					-- require("snippy").expand_snippet(args.body) -- For `snippy` users.
					-- vim.fn["UltiSnips#Anon"](args.body) -- For `ultisnips` users.
					end,
				},
				window = {
					-- completion = cmp.config.window.bordered(),
					-- documentation = cmp.config.window.bordered(),
				},
				mapping = cmp.mapping.preset.insert({
					["<C-b>"] = cmp.mapping.scroll_docs(-4),
					["<C-f>"] = cmp.mapping.scroll_docs(4),
					["<C-Space>"] = cmp.mapping.complete(),
					["<C-e>"] = cmp.mapping.abort(),
					["<CR>"] = cmp.mapping(function(fallback)
						if cmp.visible() and not cmp.confirm() then
							cmp.abort()
						else
							fallback()
						end
					end, {"i", "s"}),
					["<Tab>"] = cmp.mapping(function(fallback)
						if cmp.visible() then
							cmp.select_next_item()
							-- elseif has_words_before() then
							--   cmp.complete()
						else
							fallback() -- The fallback function sends a already mapped key. In this case, it"s probably `<Tab>`.
						end
					end, { "i", "s" }),
					["<S-Tab>"] = cmp.mapping(function()
						if cmp.visible() then
							cmp.select_prev_item()
						end
					end, { "i", "s" }),
				}),
				sources = cmp.config.sources({
					{ name = "nvim_lsp" },
					-- { name = "vsnip" }, -- For vsnip users.
					-- { name = "luasnip" }, -- For luasnip users.
					-- { name = "ultisnips" }, -- For ultisnips users.
					-- { name = "snippy" }, -- For snippy users.
					}, {
					{ name = "buffer" },
				})
			})

			-- Set configuration for specific filetype.
			cmp.setup.filetype("gitcommit", {
				sources = cmp.config.sources({
					{ name = "cmp_git" }, -- You can specify the `cmp_git` source if you were installed it.
					}, {
					{ name = "buffer" },
				})
			})

			-- Use buffer source for `/` (if you enabled `native_menu`, this won"t work anymore).
			cmp.setup.cmdline("/", {
				mapping = cmp.mapping.preset.cmdline(),
				sources = {
					{ name = "buffer" }
				}
			})

			-- Use cmdline & path source for ":" (if you enabled `native_menu`, this won"t work anymore).
			cmp.setup.cmdline(":", {
				mapping = cmp.mapping.preset.cmdline(),
				sources = cmp.config.sources({
					{ name = "path" }
				}, {
					{ name = "cmdline" }
				})
			})

			-- Setup lspconfig.
			local capabilities = require("cmp_nvim_lsp").default_capabilities()
			require("lspconfig")["pyright"].setup {
				capabilities = capabilities
			}
		end,
	},
}