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toylog.go
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toylog.go
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// package toylog provides simple leveled logging.
package toylog
import (
golog "log"
"os"
)
type logLevel int
const (
LevelDebug logLevel = iota
LevelInfo
LevelError
LevelFatal
)
var levels = map[logLevel]string{
LevelDebug: "D",
LevelInfo: "I",
LevelError: "E",
LevelFatal: "F",
}
func levelPrefix(level logLevel, space bool) string {
l := levels[level] + ":"
if space {
l = l + " "
}
return l
}
func rawPrintLn(level logLevel, msgs ...interface{}) {
m := append([]interface{}{levelPrefix(level, false)}, msgs...)
golog.Println(m...)
}
func rawPrintF(level logLevel, msg string, args ...interface{}) {
msg = levelPrefix(level, true) + msg
golog.Printf(msg, args...)
}
type logger struct {
level logLevel
}
func (l *logger) Set(level logLevel) {
l.level = level
}
func (l *logger) Debugln(v ...interface{}) {
if l.level == LevelDebug {
rawPrintLn(LevelDebug, v...)
}
}
func (l *logger) Debugf(format string, v ...interface{}) {
if l.level == LevelDebug {
rawPrintF(LevelDebug, format, v...)
}
}
func (l *logger) Infoln(v ...interface{}) {
rawPrintLn(LevelInfo, v...)
}
func (l *logger) Infof(format string, v ...interface{}) {
rawPrintF(LevelInfo, format, v...)
}
func (l *logger) Errorln(v ...interface{}) {
rawPrintLn(LevelError, v...)
}
func (l *logger) Errorf(format string, v ...interface{}) {
rawPrintF(LevelError, format, v...)
}
func (l *logger) Fatalln(v ...interface{}) {
m := append([]interface{}{levelPrefix(LevelFatal, false)}, v...)
golog.Fatalln(m...)
}
func (l *logger) Fatalf(format string, v ...interface{}) {
format = levelPrefix(LevelFatal, true) + format
golog.Fatalf(format, v...)
}
func Set(level logLevel) {
defaultLog.level = level
}
func Verbose() {
Set(LevelDebug)
}
func Debugf(format string, v ...interface{}) {
defaultLog.Debugf(format, v...)
}
func Debugln(v ...interface{}) {
defaultLog.Debugln(v...)
}
func Infof(format string, v ...interface{}) {
defaultLog.Infof(format, v...)
}
func Infoln(v ...interface{}) {
defaultLog.Infoln(v...)
}
func Errorf(format string, v ...interface{}) {
defaultLog.Errorf(format, v...)
}
func Errorln(v ...interface{}) {
defaultLog.Errorln(v...)
}
func Fatalf(format string, v ...interface{}) {
defaultLog.Fatalf(format, v...)
}
func Fatalln(v ...interface{}) {
defaultLog.Fatalln(v...)
}
func Stdout() {
golog.SetOutput(os.Stdout)
}
var defaultLog = logger{level: LevelInfo}
func init() {
golog.SetFlags(0)
}