Fix vsnip

nvim/.config/nvim/init.vim

@@ -66,6 +66,24 @@ cmp.setup({
             c = cmp.mapping.close(),
         }),
         ['<CR>'] = cmp.mapping.confirm({ select = true }),
+        ['<Tab>'] = cmp.mapping(function(fallback)
+            if cmp.visible() then
+                cmp.select_next_item()
+            elseif vim.fn["vsnip#available"](1) == 1 then
+                feedkey("<Plug>(vsnip-expand-or-jump)", "")
+            elseif has_words_before() then
+                cmp.complete()
+            else
+                fallback() -- The fallback function sends a already mapped key. In this case, it's probably `<Tab>`.
+            end
+        end, { "i", "s" }),
+        ['<S-Tab>'] = cmp.mapping(function()
+          if cmp.visible() then
+            cmp.select_prev_item()
+          elseif vim.fn["vsnip#jumpable"](-1) == 1 then
+            feedkey("<Plug>(vsnip-jump-prev)", "")
+          end
+        end, { "i", "s" }),
     },
     sources = cmp.config.sources({
         { name = 'nvim_lsp' },