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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package slog_test
import (
"log"
"log/slog"
"log/slog/internal/slogtest"
"os"
)
// This example shows how to use slog.SetLogLoggerLevel to change the minimal level
// of the internal default handler for slog package before calling slog.SetDefault.
func ExampleSetLogLoggerLevel_log() {
defer log.SetFlags(log.Flags()) // revert changes after the example
log.SetFlags(0)
defer log.SetOutput(log.Writer()) // revert changes after the example
log.SetOutput(os.Stdout)
// Default logging level is slog.LevelInfo.
log.Print("log debug") // log debug
slog.Debug("debug") // no output
slog.Info("info") // INFO info
// Set the default logging level to slog.LevelDebug.
currentLogLevel := slog.SetLogLoggerLevel(slog.LevelDebug)
defer slog.SetLogLoggerLevel(currentLogLevel) // revert changes after the example
log.Print("log debug") // log debug
slog.Debug("debug") // DEBUG debug
slog.Info("info") // INFO info
// Output:
// log debug
// INFO info
// log debug
// DEBUG debug
// INFO info
}
// This example shows how to use slog.SetLogLoggerLevel to change the minimal level
// of the internal writer that uses the custom handler for log package after
// calling slog.SetDefault.
func ExampleSetLogLoggerLevel_slog() {
// Set the default logging level to slog.LevelError.
currentLogLevel := slog.SetLogLoggerLevel(slog.LevelError)
defer slog.SetLogLoggerLevel(currentLogLevel) // revert changes after the example
defer slog.SetDefault(slog.Default()) // revert changes after the example
slog.SetDefault(slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{ReplaceAttr: slogtest.RemoveTime})))
log.Print("error") // level=ERROR msg=error
// Output:
// level=ERROR msg=error
}