refactor(nvim): steal `cmp` from LazyVim

dot_config/nvim/lua/plugins/cmp.lua

@@ -1,11 +1,40 @@
-local has_words_before = function()
-  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 has_words_before = function()
+--   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
+--
 return {
+  -- snippets
+  {
+    "L3MON4D3/LuaSnip",
+    dependencies = {
+      "rafamadriz/friendly-snippets",
+      config = function()
+        require("luasnip.loaders.from_vscode").lazy_load()
+      end,
+    },
+    opts = {
+      history = true,
+      delete_check_events = "TextChanged",
+    },
+    -- stylua: ignore
+    keys = {
+      {
+        "<tab>",
+        function()
+          return require("luasnip").jumpable(1) and "<Plug>luasnip-jump-next" or "<tab>"
+        end,
+        expr = true, silent = true, mode = "i",
+      },
+      { "<tab>", function() require("luasnip").jump(1) end, mode = "s" },
+      { "<s-tab>", function() require("luasnip").jump(-1) end, mode = { "i", "s" } },
+    },
+  },
+
   {
     "hrsh7th/nvim-cmp",
+    version = false,
+    event = "InsertEnter",
     config = function()
       local cmp = require("cmp")
       local cmp_under_comparator = require("cmp-under-comparator")
@@ -30,30 +59,31 @@ return {
           ["<C-Space>"] = cmp.mapping.complete({}),
           ["<C-e>"] = cmp.mapping.abort(),
           ["<CR>"] = cmp.mapping.confirm({ 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()
-            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" }),
+          --   ["<Tab>"] = cmp.mapping(function(fallback)
+          --     if cmp.visible() then
+          --       cmp.select_next_item()
+          --     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" }),
         }),
         sources = cmp.config.sources({
           { name = "nvim_lsp" },
+          { name = "nvim_lua" },
           { name = "luasnip" },
         }, {
           { name = "buffer" },
@@ -103,7 +133,6 @@ return {
       "hrsh7th/cmp-nvim-lua",
       "hrsh7th/cmp-cmdline",
       "saadparwaiz1/cmp_luasnip",
-      "L3MON4D3/LuaSnip",
       "lukas-reineke/cmp-under-comparator",
     },
   },