fix cmp, modularise lua plugin settings

lua/init-cmp.lua

@@ -0,0 +1,55 @@
+local cmp = require'cmp'
+cmp.setup({
+	formatting = {
+		format = function(entry, vim_item)
+			-- set a name for each source
+			vim_item.menu = ({
+				nvim_lsp = "[LSP]",
+				path = "[Path]",
+				buffer = "[Buffer]",
+				dictionary = "[Dict]",
+				ultisnips = "[UltiSnips]",
+			})[entry.source.name]
+			return vim_item
+		end,
+	},
+	completion = {
+		keyword_length = 4,
+		-- autocomplete = false
+	},
+	snippet = {
+	  expand = function(args)
+	    vim.fn["UltiSnips#Anon"](args.body)
+	  end,
+	},
+	mapping = {
+		['<C-n>'] = cmp.mapping.complete(),
+		['<C-y>'] = cmp.mapping.confirm({ select = true }),
+		-- ['<C-e>'] = cmp.mapping.close(),
+		['<C-e>'] = cmp.mapping.abort(),
+		['<C-d>'] = cmp.mapping.scroll_docs(-4),
+		['<C-u>'] = cmp.mapping.scroll_docs(4),
+	},
+	sources = {
+		{
+			name = 'nvim_lsp',
+			max_item_count = 20,
+		},
+		{ name = 'path' },
+		{
+			name = 'buffer',
+			max_item_count = 20,
+		},
+		{
+			name = 'dictionary',
+			keyword_length = 4,
+			max_item_count = 20,
+		},
+		{
+			name = 'ultisnips',
+			priority_weight = 10,
+			keyword_length = 2,
+		},
+		...
+	}
+})