Interface Formatter

formatter.go:26–28

The Formatter interface is used to implement a custom Formatter. It takes an `Entry`. It exposes all the fields, including the default ones: * `entry.Data["msg"]`. The message passed from Info, Warn, Error .. * `entry.Data["time"]`. The timestamp. * `entry.Data["level"]. The level the entry was log

// `entry.Data`. Format is expected to return an array of bytes which are then
// logged to `logger.Out`.
type Formatter interface {
	Format(*Entry) ([]byte, error)
}

// This is to not silently overwrite `time`, `msg`, `func` and `level` fields when
// dumping it. If this code wasn't there doing: