1 files changed, 15 insertions, 1 deletions
diff --git a/logger.go b/logger.go
index 9ac23c8..5cdc1a5 100644
--- a/logger.go
+++ b/logger.go
@@ -3,6 +3,7 @@ package logger
 import (
 	"fmt"
 	"os"
+	"runtime"
 	"strings"
 	"sync"
 	"time"
@@ -90,11 +91,24 @@ func (l *Logger) Info(args ...interface{}) *Logger {
 // Debug logs a debug message.
 func (l *Logger) Debug(args ...interface{}) *Logger {
 	if l.debug {
-		return l.log(args...)
+		return l.WithSource().log(args...)
 	}
 	return l
 }
 
+// WithSource annotates the log message with the source that called logger.
+func (l *Logger) WithSource() *Logger {
+	_, file, line, ok := runtime.Caller(2)
+	if !ok {
+		file = "<???>"
+		line = 1
+	} else {
+		slash := strings.LastIndex(file, "/")
+		file = file[slash+1:]
+	}
+	return l.Field("source", fmt.Sprintf("%s:%d", file, line))
+}
+
 // IsDebug determines the debug status for a logger instance.
 // Use this to conditionally execute blocks of code depending on the log verbosity.
 func (l *Logger) IsDebug() bool { return l.debug }