add new completion plugins

nvim/lua/cmp_config.lua

@@ -13,7 +13,9 @@ cmp.setup({
   },
   mapping = {
     ['<C-k>'] = cmp.mapping.select_prev_item(),
+    ['<C-p>'] = cmp.mapping.select_prev_item(),
     ['<C-j>'] = cmp.mapping.select_next_item(),
+    ['<C-n>'] = cmp.mapping.select_next_item(),
     ['<C-d>'] = cmp.mapping(cmp.mapping.scroll_docs(-4), { 'i', 'c' }),
     ['<C-f>'] = cmp.mapping(cmp.mapping.scroll_docs(4), { 'i', 'c' }),
     ['<C-Space>'] = cmp.mapping(cmp.mapping.complete(), { 'i', 'c' }),
@@ -45,11 +47,29 @@ cmp.setup({
     end, { "i", "s" })
   },
   sources = cmp.config.sources({
-      { name = 'nvim_lsp' },
+    { name = 'path' },
-      { name = 'luasnip' }, -- For luasnip users.
+    { name = 'nvim_lsp', keyword_length = 3 },
-    }, {
+    { name = 'nvim_lsp_signature_help' },
+    { name = 'nvim_lua', keyword_length = 2 },
+    { name = 'nvim_lua', keyword_length = 2 },
     { name = 'buffer' },
-    })
+    { name = 'luasnip' }, -- For luasnip users.
+  }),
+  window = {
+    completion = cmp.config.window.bordered(),
+    documentation = cmp.config.window.bordered(),
+  },
+  formatting = {
+    fields = { 'menu', 'abbr', 'kind' },
+    format = function(entry, item)
+      local menu_icon = {
+        nvim_lsp = 'λ',
+        buffer = 'Ω'
+      }
+      item.menu = menu_icon[entry.source.name]
+      return item
+    end
+  }
 })
 
 cmp.setup.cmdline('/', {

nvim/lua/plugins.lua

@@ -25,8 +25,12 @@ require("packer").startup(function(use)
     "kosayoda/nvim-lightbulb",
   })
   use("hrsh7th/cmp-nvim-lsp")
+  use("hrsh7th/cmp-nvim-lsp-signature-help")
+  use("hrsh7th/cmp-nvim-lua")
   use("hrsh7th/cmp-buffer")
   use("hrsh7th/cmp-path")
+  use("hrsh7th/cmp-vsnip")
+  use("hrsh7th/vim-vsnip")
   use("hrsh7th/nvim-cmp")
   use("hrsh7th/cmp-cmdline")
   use("saadparwaiz1/cmp_luasnip")