better movement while using cmp

after/plugin/cmp.lua

@@ -38,6 +38,12 @@ local has_words_before = function()
   [1]:sub(col, col):match("%s") == nil
 end
 
+-- insert '(' after completing a function
+cmp.event:on(
+  'confirm_done',
+  require('nvim-autopairs.completion.cmp').on_confirm_done()
+)
+
 local luasnip = require('luasnip')
 require("luasnip.loaders.from_vscode").lazy_load()
 
@@ -81,11 +87,13 @@ cmp.setup {
       return vim_item
     end
   },
+
+  -- mappings -----------------------------------------------------------------
   mapping = cmp.mapping.preset.insert({
     ["<Tab>"] = cmp.mapping(function(fallback)
       if cmp.visible() then
         cmp.select_next_item()
-      elseif luasnip.expand_or_jumpable() then
+      elseif luasnip.expand_or_locally_jumpable() then
         luasnip.expand_or_jump()
       elseif has_words_before() then
         cmp.complete()
@@ -102,9 +110,20 @@ cmp.setup {
         fallback()
       end
     end, { "i", "s" }),
-    ['<CR>'] = cmp.mapping.confirm({ select = true }),
+    ['<CR>'] = cmp.mapping({
+      i = function(fallback)
+        if cmp.visible() and cmp.get_active_entry() then
+          cmp.confirm({ behavior = cmp.ConfirmBehavior.Replace, select = false })
+        else
+          fallback()
+        end
+      end,
+      s = cmp.mapping.confirm({ select = true }),
+      c = cmp.mapping.confirm({ behavior = cmp.ConfirmBehavior.Replace, select = true }),
+    }),
     ['<ESC>'] = cmp.mapping.close(),
   }),
+
   sorting = {
     comparators = {
       cmp.config.compare.offset,