package tlog import ( "encoding/json" "fmt" "log" "os" "golang.org/x/crypto/ssh/terminal" ) const ( ProgramName = "gocryptfs" wpanicMsg = "-wpanic turns this warning into a panic: " ) // Escape sequences for terminal colors. These will be empty strings if stdout // is not a terminal. var ColorReset, ColorGrey, ColorRed, ColorGreen, ColorYellow string func JSONDump(obj interface{}) string { b, err := json.MarshalIndent(obj, "", "\t") if err != nil { return err.Error() } else { return string(b) } } // toggledLogger - a Logger than can be enabled and disabled type toggledLogger struct { // Enable or disable output Enabled bool // Panic after logging a message, useful in regression tests Wpanic bool // Private prefix and postfix are used for coloring prefix string postfix string *log.Logger } func (l *toggledLogger) Printf(format string, v ...interface{}) { if !l.Enabled { return } l.Logger.Printf(l.prefix + fmt.Sprintf(format, v...) + l.postfix) if l.Wpanic { l.Logger.Panic(wpanicMsg + fmt.Sprintf(format, v...)) } } func (l *toggledLogger) Println(v ...interface{}) { if !l.Enabled { return } l.Logger.Println(l.prefix + fmt.Sprint(v...) + l.postfix) if l.Wpanic { l.Logger.Panic(wpanicMsg + fmt.Sprint(v...)) } } // Debug messages // Can be enabled by passing "-d" var Debug *toggledLogger // Informational message // Can be disabled by passing "-q" var Info *toggledLogger // A warning, meaning nothing serious by itself but might indicate problems. // Passing "-wpanic" will make this function panic after printing the message. var Warn *toggledLogger // Fatal error, we are about to exit var Fatal *toggledLogger func init() { if terminal.IsTerminal(int(os.Stdout.Fd())) { ColorReset = "\033[0m" ColorGrey = "\033[2m" ColorRed = "\033[31m" ColorGreen = "\033[32m" ColorYellow = "\033[33m" } Debug = &toggledLogger{ Logger: log.New(os.Stdout, "", 0), } Info = &toggledLogger{ Enabled: true, Logger: log.New(os.Stdout, "", 0), } Warn = &toggledLogger{ Enabled: true, Logger: log.New(os.Stderr, "", 0), } Fatal = &toggledLogger{ Enabled: true, Logger: log.New(os.Stderr, "", 0), prefix: ColorRed, postfix: ColorReset, } }