Redo log level flags

* -vv or --log-level DEBUG
  * -v or --log-level INFO
  * --log-level NOTICE (default)
  * -q --log-level ERROR

Replace Config.Verbose and Config.Quiet with Config.LogLevel

Fixes #739 Fixes #1108 Fixes #1000

fs/log.go

@@ -11,9 +11,11 @@ import (
 // LogLevel describes rclone's logs.  These are a subset of the syslog log levels.
 type LogLevel byte
 
+//go:generate stringer -type=LogLevel
+
 // Log levels - a subset of the syslog logs
 const (
-	LogLevelEmergency = iota
+	LogLevelEmergency LogLevel = iota
 	LogLevelAlert
 	LogLevelCritical
 	LogLevelError // Error - can't be suppressed
@@ -38,30 +40,37 @@ func makeLog(o interface{}, text string, args ...interface{}) string {
 }
 
 // Errorf writes error log output for this Object or Fs.  It
-// unconditionally logs a message regardless of Config.Quiet or
-// Config.Verbose.
+// unconditionally logs a message regardless of Config.LogLevel
 func Errorf(o interface{}, text string, args ...interface{}) {
-	log.Print(makeLog(o, text, args...))
-}
-
-// Logf writes log output for this Object or Fs.  This should be
-// considered to be Info level logging.
-func Logf(o interface{}, text string, args ...interface{}) {
-	if !Config.Quiet {
+	if Config.LogLevel >= LogLevelError {
 		log.Print(makeLog(o, text, args...))
 	}
 }
 
-// Infof writes info on transfers for this Object or Fs
+// Logf writes log output for this Object or Fs.  This should be
+// considered to be Info level logging.  It is the default level.  By
+// default rclone should not log very much so only use this for
+// important things the user should see.  The user can filter these
+// out with the -q flag.
+func Logf(o interface{}, text string, args ...interface{}) {
+	if Config.LogLevel >= LogLevelNotice {
+		log.Print(makeLog(o, text, args...))
+	}
+}
+
+// Infof writes info on transfers for this Object or Fs.  Use this
+// level for logging transfers, deletions and things which should
+// appear with the -v flag.
 func Infof(o interface{}, text string, args ...interface{}) {
-	if Config.Verbose {
+	if Config.LogLevel >= LogLevelInfo {
 		DebugLogger.Print(makeLog(o, text, args...))
 	}
 }
 
-// Debugf writes debugging output for this Object or Fs
+// Debugf writes debugging output for this Object or Fs.  Use this for
+// debug only.  The user must have to specify -vv to see this.
 func Debugf(o interface{}, text string, args ...interface{}) {
-	if Config.Verbose {
+	if Config.LogLevel >= LogLevelDebug {
 		DebugLogger.Print(makeLog(o, text, args...))
 	}
 }