Merge pull request #147 from pressly/stdlogger

Improve custom logger: Use stdlib's existing logger variable by default

log.go

@@ -2,10 +2,9 @@ package goose
 
 import (
 	std "log"
-	"os"
 )
 
-var log Logger = std.New(os.Stderr, "", std.LstdFlags)
+var log Logger = &stdLogger{}
 
 // Logger is standart logger interface
 type Logger interface {
@@ -20,3 +19,12 @@ type Logger interface {
 func SetLogger(l Logger) {
 	log = l
 }
+
+// stdLogger is a default logger that outputs to a stdlib's log.std logger.
+type stdLogger struct{}
+
+func (*stdLogger) Fatal(v ...interface{})                 { std.Fatal(v...) }
+func (*stdLogger) Fatalf(format string, v ...interface{}) { std.Fatalf(format, v...) }
+func (*stdLogger) Print(v ...interface{})                 { std.Print(v...) }
+func (*stdLogger) Println(v ...interface{})               { std.Println(v...) }
+func (*stdLogger) Printf(format string, v ...interface{}) { std.Printf(format, v...) }