nvim/cmp: add simple luasnip binding to nvim-cmp

.config/nvim/plugin/cmp.lua

@@ -7,14 +7,29 @@ cmp.setup {
     snippet = {
         expand = function(args) luasnip.lsp_expand(args.body) end,
     },
-    mapping = cmp.mapping.preset.insert(),
+    mapping = cmp.mapping.preset.insert {
+        ["<Tab>"] = cmp.mapping(function(fallback)
+            if luasnip.locally_jumpable(1) then
+                luasnip.jump(1)
+            else
+                fallback()
+            end
+        end, { "i", "s" }),
+
+        ["<S-Tab>"] = cmp.mapping(function(fallback)
+            if luasnip.locally_jumpable(-1) then
+                luasnip.jump(-1)
+            else
+                fallback()
+            end
+        end, { "i", "s" }),
+    },
     sources = cmp.config.sources({
         { name = "luasnip" },
         { name = "nvim_lsp" },
         { name = "path" },
-        },
+    }, {
-        {
         { name = "buffer" },
-            { name = "spell", },
+        { name = "spell" },
     }),
 }