1package goose
 2
 3import (
 4	std "log"
 5)
 6
 7var log Logger = &stdLogger{}
 8
 9// Logger is standard logger interface
10type Logger interface {
11	Fatalf(format string, v ...interface{})
12	Printf(format string, v ...interface{})
13}
14
15// SetLogger sets the logger for package output
16func SetLogger(l Logger) {
17	log = l
18}
19
20// stdLogger is a default logger that outputs to a stdlib's log.std logger.
21type stdLogger struct{}
22
23func (*stdLogger) Fatalf(format string, v ...interface{}) { std.Fatalf(format, v...) }
24func (*stdLogger) Printf(format string, v ...interface{}) { std.Printf(format, v...) }
25
26// NopLogger returns a logger that discards all logged output.
27func NopLogger() Logger {
28	return &nopLogger{}
29}
30
31type nopLogger struct{}
32
33var _ Logger = (*nopLogger)(nil)
34
35func (*nopLogger) Fatalf(format string, v ...interface{}) {}
36func (*nopLogger) Printf(format string, v ...interface{}) {}