my demo first config lua

lua/plugins/cmp.lua

@@ -0,0 +1,75 @@
+return {
+  {
+    "L3MON4D3/LuaSnip",
+    keys = function()
+      return {}
+    end,
+  },
+  {
+    "hrsh7th/nvim-cmp",
+    dependencies = {
+      "hrsh7th/cmp-emoji",
+      config = function()
+        local cmp = require("cmp")
+
+        -- cmp.setup.cmdline(":", {
+        --   mapping = cmp.mapping.preset.cmdline(),
+        --   sources = cmp.config.sources({
+        --     { name = "path" },
+        --   }, {
+        --     {
+        --       name = "cmdline",
+        --       option = {
+        --         ignore_cmds = { "Man", "!" },
+        --       },
+        --     },
+        --   }),
+        -- })
+
+      end,
+    },
+    -- @param opts cmp.ConfigSchema
+    opts = function(_, opts)
+      local cmp = require("cmp")
+
+      opts.preselect = cmp.PreselectMode.None
+      opts.completion = {
+        completeopt = "noselect",
+      }
+
+      local has_words_before = function()
+        unpack = unpack or table.unpack
+        local line, col = unpack(vim.api.nvim_win_get_cursor(0))
+        return col ~= 0 and vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:sub(col, col):match("%s") == nil
+      end
+
+      local luasnip = require("luasnip")
+
+      opts.mapping = vim.tbl_extend("force", opts.mapping, {
+        ["<CR>"] = cmp.mapping.confirm({ select = false }),
+        ["<Tab>"] = cmp.mapping(function(fallback)
+          if cmp.visible() then
+            cmp.select_next_item()
+          -- You could replace the expand_or_jumpable() calls with expand_or_locally_jumpable()
+          -- this way you will only jump inside the snippet region
+          elseif luasnip.expand_or_jumpable() then
+            luasnip.expand_or_jump()
+          elseif has_words_before() then
+            cmp.complete()
+          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" }),
+      })
+    end,
+  },
+}