feat(cmp): better tab behavior for cmp and luasnip

lua/lazyvim/plugins/coding.lua

@@ -36,6 +36,26 @@ return {
           ["<C-Space>"] = cmp.mapping.complete(),
           ["<C-e>"] = cmp.mapping.abort(),
           ["<CR>"] = cmp.mapping.confirm({ select = true }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
+          ["<Tab>"] = cmp.mapping(function(fallback)
+            local luasnip = require("luasnip")
+            if cmp.visible() then
+              cmp.select_next_item()
+            elseif luasnip.expand_or_jumpable() then
+              luasnip.expand_or_jump()
+            else
+              fallback()
+            end
+          end, { "i", "s" }),
+          ["<S-Tab>"] = cmp.mapping(function(fallback)
+            local luasnip = require("luasnip")
+            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" },