tpl/debug: Add debug.Timer

Closes #11580

tpl/debug/integration_test.go

@@ -0,0 +1,45 @@
+// Copyright 2023 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless requiredF by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package debug_test
+
+import (
+	"testing"
+
+	"github.com/bep/logg"
+	"github.com/gohugoio/hugo/hugolib"
+)
+
+func TestTimer(t *testing.T) {
+	files := `
+-- hugo.toml --
+baseURL = "https://example.org/"
+disableKinds = ["taxonomy", "term"]
+-- layouts/index.html --
+{{ range seq 2 }}
+{{ $t := debug.Timer "foo" }}
+{{ seq 1 1000 }}
+{{ $t.Stop }}
+{{ end }}
+
+`
+	b := hugolib.NewIntegrationTestBuilder(
+		hugolib.IntegrationTestConfig{
+			T:           t,
+			TxtarString: files,
+			LogLevel:    logg.LevelInfo,
+		},
+	).Build()
+
+	b.AssertLogContains("imer:  name \"foo\" count '\\x02' duration")
+}