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lua/plugins/nvim-cmp.lua

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+-- Auto-completion / Snippets
+return {
+  -- https://github.com/hrsh7th/nvim-cmp
+  'hrsh7th/nvim-cmp',
+  event = 'InsertEnter',
+  dependencies = {
+    -- Snippet engine & associated nvim-cmp source
+    -- https://github.com/L3MON4D3/LuaSnip
+    'L3MON4D3/LuaSnip',
+    -- https://github.com/saadparwaiz1/cmp_luasnip
+    'saadparwaiz1/cmp_luasnip',
+
+    -- LSP completion capabilities
+    -- https://github.com/hrsh7th/cmp-nvim-lsp
+    'hrsh7th/cmp-nvim-lsp',
+
+    -- Additional user-friendly snippets
+    -- https://github.com/rafamadriz/friendly-snippets
+    'rafamadriz/friendly-snippets',
+    -- https://github.com/hrsh7th/cmp-buffer
+    'hrsh7th/cmp-buffer',
+    -- https://github.com/hrsh7th/cmp-path
+    'hrsh7th/cmp-path',
+    -- https://github.com/hrsh7th/cmp-cmdline
+    'hrsh7th/cmp-cmdline',
+  },
+  config = function()
+    local cmp = require('cmp')
+    local luasnip = require('luasnip')
+    require('luasnip.loaders.from_vscode').lazy_load()
+    luasnip.config.setup({})
+
+    cmp.setup({
+      snippet = {
+        expand = function(args)
+          luasnip.lsp_expand(args.body)
+        end,
+      },
+      completion = {
+        completeopt = 'menu,menuone,noinsert',
+      },
+      mapping = cmp.mapping.preset.insert {
+        ['<C-j>'] = cmp.mapping.select_next_item(), -- next suggestion
+        ['<C-k>'] = cmp.mapping.select_prev_item(), -- previous suggestion
+        ['<C-b>'] = cmp.mapping.scroll_docs(-4), -- scroll backward
+        ['<C-f>'] = cmp.mapping.scroll_docs(4), -- scroll forward
+        ['<C-Space>'] = cmp.mapping.complete {}, -- show completion suggestions
+        ['<CR>'] = cmp.mapping.confirm {
+          behavior = cmp.ConfirmBehavior.Replace,
+          select = true,
+        },
+	-- Tab through suggestions or when a snippet is active, tab to the next argument
+        ['<Tab>'] = cmp.mapping(function(fallback)
+          if cmp.visible() then
+            cmp.select_next_item()
+          elseif luasnip.expand_or_locally_jumpable() then
+            luasnip.expand_or_jump()
+          else
+            fallback()
+          end
+        end, { 'i', 's' }),
+	-- Tab backwards through suggestions or when a snippet is active, tab to the next argument
+        ['<S-Tab>'] = cmp.mapping(function(fallback)
+          if cmp.visible() then
+            cmp.select_prev_item()
+          elseif luasnip.locally_jumpable(-1) then
+            luasnip.jump(-1)
+          else
+            fallback()
+          end
+        end, { 'i', 's' }),
+      },
+      sources = cmp.config.sources({
+        { name = "nvim_lsp" }, -- lsp 
+        { name = "luasnip" }, -- snippets
+        { name = "buffer" }, -- text within current buffer
+        { name = "path" }, -- file system paths
+      }),
+      window = {
+        -- Add borders to completions popups
+        completion = cmp.config.window.bordered(),
+        documentation = cmp.config.window.bordered(),
+      },
+    })
+  end,
+ }
+