Merge pull request #7 from thockin/with-call-depth

Add logr.Logger.WithCallDepth() support

example/main.go

@@ -20,6 +20,7 @@ import (
 	stdlog "log"
 	"os"
 
+	"github.com/go-logr/logr"
 	"github.com/go-logr/stdr"
 )
 
@@ -31,6 +32,14 @@ func (e E) Error() string {
 	return e.str
 }
 
+func Helper(log logr.Logger, msg string) {
+	helper2(log, msg)
+}
+
+func helper2(log logr.Logger, msg string) {
+	logr.WithCallDepth(log, 2).Info(msg)
+}
+
 func main() {
 	stdr.SetVerbosity(1)
 	log := stdr.NewWithOptions(stdlog.New(os.Stderr, "", stdlog.LstdFlags), stdr.Options{LogCaller: stdr.All})
@@ -40,4 +49,5 @@ func main() {
 	log.V(1).V(1).Info("you should NOT see this")
 	log.Error(nil, "uh oh", "trouble", true, "reasons", []float64{0.1, 0.11, 3.14})
 	log.Error(E{"an error occurred"}, "goodbye", "code", -1)
+	Helper(log, "thru a helper")
 }

stdr.go

@@ -263,7 +263,14 @@ func (l logger) WithValues(kvList ...interface{}) logr.Logger {
 	return new
 }
 
+func (l logger) WithCallDepth(depth int) logr.Logger {
+	new := l.clone()
+	new.depth += depth
+	return new
+}
+
 var _ logr.Logger = logger{}
+var _ logr.CallDepthLogger = logger{}
 
 // Underlier exposes access to the underlying logging implementation.  Since
 // callers only have a logr.Logger, they have to know which implementation is