Refactor vim LSP configuration

vim/lua/on_lsp_attach.lua

@@ -1,6 +1,6 @@
 local opts = { noremap=true, silent=true }
 
-return function(client, bufnr)
+return function(_, bufnr)
 	-- Enable completion triggered by <c-x><c-o>
 	vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')
 
@@ -23,5 +23,5 @@ return function(client, bufnr)
 	vim.keymap.set('n', '<leader>r', vim.lsp.buf.rename, bufopts)
 	vim.keymap.set('n', '<leader>ca', vim.lsp.buf.code_action, bufopts)
 	vim.keymap.set('n', 'gr', vim.lsp.buf.references, bufopts)
-	vim.keymap.set('n', '<leader>f', vim.lsp.buf.formatting, bufopts)
+	--vim.keymap.set('n', '<leader>f', vim.lsp.buf.formatting, bufopts)
 end

vim/lua/sumneko.lua

@@ -1,4 +0,0 @@
-local lsp_flags = require('lspconfig').sumneko_lua.setup{
-	on_attach = require 'on_lsp_attach',
-}
-vim.api.nvim_command("LspStart")

vim/plugin/lsp.vim

@@ -0,0 +1,2 @@
+lua require('lspconfig').lua_ls.setup{ on_attach = require 'on_lsp_attach' }
+lua require('lspconfig').zls.setup{ on_attach = require 'on_lsp_attach' }