feat: add a new single-line formatter for console_exporter

Closes #7

example/main.go

@@ -26,8 +26,11 @@ func main() {
 
 	envFilter := "OBSERVER_CONSOLE"
 
+	singlelineFmt := console_exporter.NewSimpleSinglelineFormatter()
+
 	exps = append(exps, exporters.DevConsoleExporter(console_exporter.ProcessorOptions{
 		FilterFromEnvVar: &envFilter,
+		TraceFormatter:   &singlelineFmt,
 	}))
 
 	gelfExp, err := exporters.GelfExporter()

pkg/exporters/console_exporter/singleline_formatter.go

@@ -0,0 +1,102 @@
+package console_exporter
+
+import (
+	"fmt"
+	"slices"
+	"time"
+
+	"git.ma-al.com/maal-libraries/observer/pkg/console_fmt"
+	"git.ma-al.com/maal-libraries/observer/pkg/level"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/sdk/trace"
+)
+
+func NewSimpleSinglelineFormatter() TraceFormatter {
+	return &SimpleSinglelineFormatter{}
+}
+
+// A simple formatter that will print only events using a single line per entry
+type SimpleSinglelineFormatter struct{}
+
+func (f *SimpleSinglelineFormatter) FormatSpanStart(span trace.ReadOnlySpan, selectedAttrs []attribute.KeyValue, lvl level.SeverityLevel) (string, error) {
+	attrs := ""
+	slices.SortFunc(selectedAttrs, func(a, b attribute.KeyValue) int {
+		if a.Key > b.Key {
+			return 1
+		} else {
+			return -1
+		}
+	})
+
+	if len(selectedAttrs) > 0 {
+		attrs += " |"
+		for _, kv := range selectedAttrs {
+			if len(kv.Key) > 0 {
+				attrs += fmt.Sprintf(" %s=%s", string(kv.Key), AttrValueToString(kv.Value))
+			}
+		}
+	}
+
+	formattedSpanString := fmt.Sprintf(
+		"%s%s\n",
+		console_fmt.Bold(console_fmt.SeverityLevelToColor(lvl)+fmt.Sprintf("%s %s [SpanStart] - ", time.Now().Format("2006-01-02 15:04:05"), lvl.String())+span.Name()),
+		attrs,
+	)
+
+	return formattedSpanString, nil
+}
+func (f *SimpleSinglelineFormatter) FormatSpanEnd(span trace.ReadOnlySpan, selectedAttrs []attribute.KeyValue, lvl level.SeverityLevel) (string, error) {
+	attrs := ""
+	slices.SortFunc(selectedAttrs, func(a, b attribute.KeyValue) int {
+		if a.Key > b.Key {
+			return 1
+		} else {
+			return -1
+		}
+	})
+
+	if len(selectedAttrs) > 0 {
+		attrs += " |"
+		for _, kv := range selectedAttrs {
+			if len(kv.Key) > 0 {
+				attrs += fmt.Sprintf(" %s=%s", string(kv.Key), AttrValueToString(kv.Value))
+			}
+		}
+	}
+
+	formattedSpanString := fmt.Sprintf(
+		"%s%s\n",
+		console_fmt.Bold(console_fmt.SeverityLevelToColor(lvl)+fmt.Sprintf("%s %s [SpanEnd] - ", time.Now().Format("2006-01-02 15:04:05"), lvl.String())+span.Name()),
+		attrs,
+	)
+
+	return formattedSpanString, nil
+
+}
+func (f *SimpleSinglelineFormatter) FormatEvent(event trace.Event, span trace.ReadOnlySpan, selectedAttrs []attribute.KeyValue, lvl level.SeverityLevel) (string, error) {
+	attrs := ""
+	slices.SortFunc(selectedAttrs, func(a, b attribute.KeyValue) int {
+		if a.Key > b.Key {
+			return 1
+		} else {
+			return -1
+		}
+	})
+
+	if len(selectedAttrs) > 0 {
+		attrs += " |"
+		for _, kv := range selectedAttrs {
+			if len(kv.Key) > 0 {
+				attrs += fmt.Sprintf(" %s=%s", string(kv.Key), AttrValueToString(kv.Value))
+			}
+		}
+	}
+
+	formattedSpanString := fmt.Sprintf(
+		"%s%s\n",
+		console_fmt.Bold(console_fmt.SeverityLevelToColor(lvl)+fmt.Sprintf("%s %s [Event] - ", time.Now().Format("2006-01-02 15:04:05"), lvl.String())+event.Name),
+		attrs,
+	)
+
+	return formattedSpanString, nil
+}