[NeoVim] Install nvim-cmp

.config/nvim/lua/lspconfig/settings.lua

@@ -1,3 +1,5 @@
+local servers = { 'pyright', 'sumneko_lua', 'eslint', 'tsserver' }
+
 -- Mappings.
 -- See `:help vim.diagnostic.*` for documentation on any of the below functions
 local opts = { noremap=true, silent=true }
@@ -32,15 +34,62 @@ local on_attach = function(client, bufnr)
   vim.keymap.set('n', '<space>f', vim.lsp.buf.formatting, bufopts)
 end
 
+local capabilities = vim.lsp.protocol.make_client_capabilities()
+capabilities = require('cmp_nvim_lsp').update_capabilities(capabilities)
+
 -- Use a loop to conveniently call 'setup' on multiple servers and
 -- map buffer local keybindings when the language server attaches
-local servers = { 'pyright', 'sumneko_lua' }
 for _, lsp in pairs(servers) do
   require('lspconfig')[lsp].setup {
     on_attach = on_attach,
+    capabilities = capabilities,
     flags = {
       -- This will be the default in neovim 0.7+
       debounce_text_changes = 150,
     }
   }
 end
+
+-- luasnip setup
+local luasnip = require 'luasnip'
+
+-- nvim-cmp setup
+local cmp = require 'cmp'
+cmp.setup {
+  snippet = {
+    expand = function(args)
+      luasnip.lsp_expand(args.body)
+    end,
+  },
+  mapping = cmp.mapping.preset.insert({
+    ['<C-d>'] = cmp.mapping.scroll_docs(-4),
+    ['<C-f>'] = cmp.mapping.scroll_docs(4),
+    ['<C-Space>'] = cmp.mapping.complete(),
+    ['<CR>'] = cmp.mapping.confirm {
+      behavior = cmp.ConfirmBehavior.Replace,
+      select = true,
+    },
+    ['<Tab>'] = cmp.mapping(function(fallback)
+      if cmp.visible() then
+        cmp.select_next_item()
+      elseif luasnip.expand_or_jumpable() then
+        luasnip.expand_or_jump()
+      else
+        fallback()
+      end
+    end, { 'i', 's' }),
+    ['<S-Tab>'] = cmp.mapping(function(fallback)
+      if cmp.visible() then
+        cmp.select_prev_item()
+      elseif luasnip.jumpable(-1) then
+        luasnip.jump(-1)
+      else
+        fallback()
+      end
+    end, { 'i', 's' }),
+  }),
+  sources = {
+    { name = 'nvim_lsp' },
+    { name = 'luasnip' },
+  },
+}

.config/nvim/lua/plugins.lua

@@ -46,4 +46,11 @@ return require('packer').startup(function()
 
   use { 'sindrets/diffview.nvim', requires = 'nvim-lua/plenary.nvim' }
 
+  use {
+    'hrsh7th/nvim-cmp',
+    'hrsh7th/cmp-nvim-lsp',
+    'saadparwaiz1/cmp_luasnip',
+    'L3MON4D3/LuaSnip'
+  }
+
 end)