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debug: add an mtree.Debugf and -debug flag

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Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
This commit is contained in:
Vincent Batts 2016-07-20 13:28:08 -04:00
parent 39f68f5be2
commit ed6b293839
4 changed files with 26 additions and 3 deletions
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18
debug.go Normal file
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@ -0,0 +1,18 @@
package mtree
import (
"fmt"
"os"
"time"
)
// DebugOutput is the where DEBUG output is written
var DebugOutput = os.Stderr
// Debugf does formatted output to DebugOutput, only if DEBUG environment variable is set
func Debugf(format string, a ...interface{}) (n int, err error) {
if os.Getenv("DEBUG") != "" {
return fmt.Fprintf(DebugOutput, "[%d] [DEBUG] %s\n", time.Now().UnixNano(), fmt.Sprintf(format, a...))
}
return 0, nil
}