feat: add trace level support (#83)

logger.go

@@ -27,6 +27,7 @@ const (
 	Warn
 	Info
 	Debug
+	Trace
 )
 
 // Level represents the predefined log level.
@@ -35,6 +36,8 @@ type Level int
 // LevelFromString converts a string to Level.
 func LevelFromString(lvl string) (Level, error) {
 	switch lvl {
+	case "trace", "trce":
+		return Trace, nil
 	case "debug", "dbug":
 		return Debug, nil
 	case "info":
@@ -53,6 +56,8 @@ func LevelFromString(lvl string) (Level, error) {
 // String returns the string representation of the level.
 func (l Level) String() string {
 	switch l {
+	case Trace:
+		return "trce"
 	case Debug:
 		return "dbug"
 	case Info:
@@ -153,6 +158,11 @@ func (l *Logger) With(ctx ...Field) *Logger {
 	}
 }
 
+// Trace logs a trace message, intended for fine grained debug messages.
+func (l *Logger) Trace(msg string, ctx ...Field) {
+	l.write(msg, Trace, ctx)
+}
+
 // Debug logs a debug message.
 func (l *Logger) Debug(msg string, ctx ...Field) {
 	l.write(msg, Debug, ctx)

logger_test.go

@@ -22,6 +22,16 @@ func TestLevelFromString(t *testing.T) {
 		want      logger.Level
 		wantError bool
 	}{
+		{
+			lvl:       "trce",
+			want:      logger.Trace,
+			wantError: false,
+		},
+		{
+			lvl:       "trace",
+			want:      logger.Trace,
+			wantError: false,
+		},
 		{
 			lvl:       "dbug",
 			want:      logger.Debug,
@@ -127,6 +137,11 @@ func TestLogger(t *testing.T) {
 		fn   func(l *logger.Logger)
 		want string
 	}{
+		{
+			name: "Trace",
+			fn:   func(l *logger.Logger) { l.Trace("debug", ctx.Str("level", "trace")) },
+			want: "lvl=trce msg=debug level=trace\n",
+		},
 		{
 			name: "Debug",
 			fn:   func(l *logger.Logger) { l.Debug("debug", ctx.Str("level", "debug")) },
@@ -161,7 +176,7 @@ func TestLogger(t *testing.T) {
 			t.Parallel()
 
 			var buf bytes.Buffer
-			log := logger.New(&buf, logger.LogfmtFormat(), logger.Debug)
+			log := logger.New(&buf, logger.LogfmtFormat(), logger.Trace)
 
 			test.fn(log)
 
@@ -229,7 +244,7 @@ func TestLogger_Stack(t *testing.T) {
 
 	log.Info("some message", ctx.Stack("stack"))
 
-	want := `lvl=info msg="some message" stack=[github.com/hamba/logger/logger/logger_test.go:230]` + "\n"
+	want := `lvl=info msg="some message" stack=[github.com/hamba/logger/logger/logger_test.go:245]` + "\n"
 	assert.Equal(t, want, buf.String())
 }