Allow devs to change the width of the logging level column in consolewriter (#87)

* Allow user to change the width of the logging level column
* Change default level width to 0 (no dynamic width)

console.go

@@ -31,6 +31,10 @@ var consoleBufPool = sync.Pool{
 	},
 }
 
+// LevelWidth defines the desired character width of the log level column.
+// Default 0 does not trim or pad (variable width based level text, e.g. "INFO" or "ERROR")
+var LevelWidth = 0
+
 // ConsoleWriter reads a JSON object per write operation and output an
 // optionally colored human readable version on the Out writer.
 type ConsoleWriter struct {
@@ -55,7 +59,14 @@ func (w ConsoleWriter) Write(p []byte) (n int, err error) {
 		if !w.NoColor {
 			lvlColor = levelColor(l)
 		}
-		level = strings.ToUpper(l)[0:4]
+		level = strings.ToUpper(l)
+		if LevelWidth > 0 {
+			if padding := LevelWidth - len(level); padding > 0 {
+				level += strings.Repeat(" ", padding)
+			} else {
+				level = level[0:LevelWidth]
+			}
+		}
 	}
 	fmt.Fprintf(buf, "%s |%s| %s",
 		colorize(formatTime(event[TimestampFieldName]), cDarkGray, !w.NoColor),