RenderPattern

RenderString implementation that interprets a string pattern of tokens specifying log event fields to show.

Pattern syntax is modelled after pattern layouts from Log4j and Logback.

Token format is %[WIDTH]X[{FORMAT}] where:

WIDTH is an optional integer width. If the field is wider than the specified width, it is truncated to that width. If the field is narrower, it is padded with spaces to that width: left-aligned if width is positive and right-aligned if it is negative.
X specifies the log event field to render:
t ->LogEvent.timestamp in ISO8601 format. Use the format LOCAL_TIME to output local time.
h ->LogEvent.host.
l ->LogEvent.logger.
c ->LogEvent.context, if present.
v ->LogEvent.level. Use the format COLOUR or COLOR to output different colours for different levels.
m ->LogEvent.message after evaluating it as a message template.
s ->LogEvent.stackTrace if present, preceded by a newline. If WIDTH is specified, limit the number of lines output.
i ->LogEvent.items, if there are any.
n -> output a newline.

Constructors

constructor(pattern: String = "%m%n")

open operator override fun invoke(event: LogEvent): String

Render a log event into a string.