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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
// Author: arnej
package trace
import (
"fmt"
"os"
)
// handling of informational output
type outputLevel int
const (
levelWarning outputLevel = iota - 1
levelNone
levelInfo
levelTrace
levelDebug
levelSpam
)
var currentOutputLevel outputLevel = levelInfo
func AdjustVerbosity(howMuch int) {
currentOutputLevel = (outputLevel)(howMuch + int(currentOutputLevel))
}
func Silent() {
currentOutputLevel = levelNone
}
func outputStderr(l outputLevel, n string, v ...interface{}) {
if l > currentOutputLevel {
return
}
w := make([]interface{}, len(v)+1)
w[0] = n
for idx, arg := range v {
w[idx+1] = arg
}
fmt.Fprintln(os.Stderr, w...)
}
func Info(v ...interface{}) {
outputStderr(levelInfo, "[info]", v...)
}
func Trace(v ...interface{}) {
outputStderr(levelTrace, "[trace]", v...)
}
func Debug(v ...interface{}) {
outputStderr(levelDebug, "[debug]", v...)
}
func Warning(v ...interface{}) {
outputStderr(levelWarning, "[warning]", v...)
}
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