Replace the old log setup, with structured logging etc.

Fixes #11124

common/loggers/loggerglobal.go

@@ -0,0 +1,53 @@
+// Copyright 2023 The Hugo Authors. All rights reserved.
+// Some functions in this file (see comments) is based on the Go source code,
+// copyright The Go Authors and  governed by a BSD-style license.
+//
+// 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 required 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 loggers
+
+import (
+	"sync"
+
+	"github.com/bep/logg"
+)
+
+func InitGlobalLogger(panicOnWarnings bool) {
+	logMu.Lock()
+	defer logMu.Unlock()
+	var logHookLast func(e *logg.Entry) error
+	if panicOnWarnings {
+		logHookLast = PanicOnWarningHook
+	}
+
+	log = New(
+		Options{
+			Distinct:    true,
+			HandlerPost: logHookLast,
+		},
+	)
+}
+
+var logMu sync.Mutex
+
+func Log() Logger {
+	logMu.Lock()
+	defer logMu.Unlock()
+	return log
+}
+
+// The global logger.
+var log Logger
+
+func init() {
+	InitGlobalLogger(false)
+}