Added TRACE level logging.

.gitignore

@@ -1 +1,2 @@
 logrus
+vendor

entry.go

@@ -168,6 +168,12 @@ func (entry *Entry) Debug(args ...interface{}) {
 	}
 }
 
+func (entry *Entry) Trace(args ...interface{}) {
+	if entry.Logger.IsLevelEnabled(TraceLevel) {
+		entry.log(TraceLevel, fmt.Sprint(args...))
+	}
+}
+
 func (entry *Entry) Print(args ...interface{}) {
 	entry.Info(args...)
 }
@@ -216,6 +222,12 @@ func (entry *Entry) Debugf(format string, args ...interface{}) {
 	}
 }
 
+func (entry *Entry) Tracef(format string, args ...interface{}) {
+	if entry.Logger.IsLevelEnabled(TraceLevel) {
+		entry.Trace(fmt.Sprintf(format, args...))
+	}
+}
+
 func (entry *Entry) Infof(format string, args ...interface{}) {
 	if entry.Logger.IsLevelEnabled(InfoLevel) {
 		entry.Info(fmt.Sprintf(format, args...))
@@ -257,6 +269,12 @@ func (entry *Entry) Panicf(format string, args ...interface{}) {
 
 // Entry Println family functions
 
+func (entry *Entry) Traceln(args ...interface{}) {
+	if entry.Logger.IsLevelEnabled(TraceLevel) {
+		entry.Trace(entry.sprintlnn(args...))
+	}
+}
+
 func (entry *Entry) Debugln(args ...interface{}) {
 	if entry.Logger.IsLevelEnabled(DebugLevel) {
 		entry.Debug(entry.sprintlnn(args...))

example_basic_test.go

@@ -12,7 +12,7 @@ func Example_basic() {
 	log.Formatter = new(logrus.TextFormatter)                     //default
 	log.Formatter.(*logrus.TextFormatter).DisableColors = true    // remove colors
 	log.Formatter.(*logrus.TextFormatter).DisableTimestamp = true // remove timestamp from test output
-	log.Level = logrus.DebugLevel
+	log.Level = logrus.TraceLevel
 	log.Out = os.Stdout
 
 	// file, err := os.OpenFile("logrus.log", os.O_CREATE|os.O_WRONLY, 0666)
@@ -37,6 +37,11 @@ func Example_basic() {
 		}
 	}()
 
+	log.WithFields(logrus.Fields{
+		"animal": "walrus",
+		"number": 0,
+	}).Trace("Went to the beach")
+
 	log.WithFields(logrus.Fields{
 		"animal": "walrus",
 		"number": 8,
@@ -62,6 +67,7 @@ func Example_basic() {
 	}).Panic("It's over 9000!")
 
 	// Output:
+	// level=trace msg="Went to the beach" animal=walrus number=0
 	// level=debug msg="Started observing beach" animal=walrus number=8
 	// level=info msg="A group of walrus emerges from the ocean" animal=walrus size=10
 	// level=warning msg="The group's number increased tremendously!" number=122 omg=true

exported.go

@@ -77,6 +77,11 @@ func WithTime(t time.Time) *Entry {
 	return std.WithTime(t)
 }
 
+// Trace logs a message at level Trace on the standard logger.
+func Trace(args ...interface{}) {
+	std.Trace(args...)
+}
+
 // Debug logs a message at level Debug on the standard logger.
 func Debug(args ...interface{}) {
 	std.Debug(args...)
@@ -117,6 +122,11 @@ func Fatal(args ...interface{}) {
 	std.Fatal(args...)
 }
 
+// Tracef logs a message at level Debug on the standard logger.
+func Tracef(format string, args ...interface{}) {
+	std.Tracef(format, args...)
+}
+
 // Debugf logs a message at level Debug on the standard logger.
 func Debugf(format string, args ...interface{}) {
 	std.Debugf(format, args...)
@@ -157,6 +167,11 @@ func Fatalf(format string, args ...interface{}) {
 	std.Fatalf(format, args...)
 }
 
+// Traceln logs a message at level Debug on the standard logger.
+func Traceln(args ...interface{}) {
+	std.Traceln(args...)
+}
+
 // Debugln logs a message at level Debug on the standard logger.
 func Debugln(args ...interface{}) {
 	std.Debugln(args...)

hook_test.go

@@ -21,6 +21,7 @@ func (hook *TestHook) Fire(entry *Entry) error {
 
 func (hook *TestHook) Levels() []Level {
 	return []Level{
+		TraceLevel,
 		DebugLevel,
 		InfoLevel,
 		WarnLevel,
@@ -53,6 +54,7 @@ func (hook *ModifyHook) Fire(entry *Entry) error {
 
 func (hook *ModifyHook) Levels() []Level {
 	return []Level{
+		TraceLevel,
 		DebugLevel,
 		InfoLevel,
 		WarnLevel,

hooks/syslog/syslog.go

@@ -43,7 +43,7 @@ func (hook *SyslogHook) Fire(entry *logrus.Entry) error {
 		return hook.Writer.Warning(line)
 	case logrus.InfoLevel:
 		return hook.Writer.Info(line)
-	case logrus.DebugLevel:
+	case logrus.DebugLevel, logrus.TraceLevel:
 		return hook.Writer.Debug(line)
 	default:
 		return nil

logger.go

@@ -126,6 +126,14 @@ func (logger *Logger) WithTime(t time.Time) *Entry {
 	return entry.WithTime(t)
 }
 
+func (logger *Logger) Tracef(format string, args ...interface{}) {
+	if logger.IsLevelEnabled(TraceLevel) {
+		entry := logger.newEntry()
+		entry.Tracef(format, args...)
+		logger.releaseEntry(entry)
+	}
+}
+
 func (logger *Logger) Debugf(format string, args ...interface{}) {
 	if logger.IsLevelEnabled(DebugLevel) {
 		entry := logger.newEntry()
@@ -189,6 +197,14 @@ func (logger *Logger) Panicf(format string, args ...interface{}) {
 	}
 }
 
+func (logger *Logger) Trace(args ...interface{}) {
+	if logger.IsLevelEnabled(TraceLevel) {
+		entry := logger.newEntry()
+		entry.Trace(args...)
+		logger.releaseEntry(entry)
+	}
+}
+
 func (logger *Logger) Debug(args ...interface{}) {
 	if logger.IsLevelEnabled(DebugLevel) {
 		entry := logger.newEntry()
@@ -252,6 +268,14 @@ func (logger *Logger) Panic(args ...interface{}) {
 	}
 }
 
+func (logger *Logger) Traceln(args ...interface{}) {
+	if logger.IsLevelEnabled(TraceLevel) {
+		entry := logger.newEntry()
+		entry.Traceln(args...)
+		logger.releaseEntry(entry)
+	}
+}
+
 func (logger *Logger) Debugln(args ...interface{}) {
 	if logger.IsLevelEnabled(DebugLevel) {
 		entry := logger.newEntry()

logrus.go

@@ -15,6 +15,8 @@ type Level uint32
 // Convert the Level to a string. E.g. PanicLevel becomes "panic".
 func (level Level) String() string {
 	switch level {
+	case TraceLevel:
+		return "trace"
 	case DebugLevel:
 		return "debug"
 	case InfoLevel:
@@ -47,6 +49,8 @@ func ParseLevel(lvl string) (Level, error) {
 		return InfoLevel, nil
 	case "debug":
 		return DebugLevel, nil
+	case "trace":
+		return TraceLevel, nil
 	}
 
 	var l Level
@@ -61,6 +65,7 @@ var AllLevels = []Level{
 	WarnLevel,
 	InfoLevel,
 	DebugLevel,
+	TraceLevel,
 }
 
 // These are the different logging levels. You can set the logging level to log
@@ -82,6 +87,8 @@ const (
 	InfoLevel
 	// DebugLevel level. Usually only enabled when debugging. Very verbose logging.
 	DebugLevel
+	// TraceLevel level. Usually only enabled when debugging. Very verbose logging.  Usually reserved for message traces
+	TraceLevel
 )
 
 // Won't compile if StdLogger can't be realized by a log.Logger
@@ -114,6 +121,7 @@ type FieldLogger interface {
 	WithFields(fields Fields) *Entry
 	WithError(err error) *Entry
 
+	Tracef(format string, args ...interface{})
 	Debugf(format string, args ...interface{})
 	Infof(format string, args ...interface{})
 	Printf(format string, args ...interface{})
@@ -123,6 +131,7 @@ type FieldLogger interface {
 	Fatalf(format string, args ...interface{})
 	Panicf(format string, args ...interface{})
 
+	Trace(args ...interface{})
 	Debug(args ...interface{})
 	Info(args ...interface{})
 	Print(args ...interface{})
@@ -132,6 +141,7 @@ type FieldLogger interface {
 	Fatal(args ...interface{})
 	Panic(args ...interface{})
 
+	Traceln(args ...interface{})
 	Debugln(args ...interface{})
 	Infoln(args ...interface{})
 	Println(args ...interface{})

text_formatter.go

@@ -183,7 +183,7 @@ func (f *TextFormatter) Format(entry *Entry) ([]byte, error) {
 func (f *TextFormatter) printColored(b *bytes.Buffer, entry *Entry, keys []string, timestampFormat string) {
 	var levelColor int
 	switch entry.Level {
-	case DebugLevel:
+	case DebugLevel, TraceLevel:
 		levelColor = gray
 	case WarnLevel:
 		levelColor = yellow

writer.go

@@ -24,6 +24,8 @@ func (entry *Entry) WriterLevel(level Level) *io.PipeWriter {
 	var printFunc func(args ...interface{})
 
 	switch level {
+	case TraceLevel:
+		printFunc = entry.Trace
 	case DebugLevel:
 		printFunc = entry.Debug
 	case InfoLevel: