Provides functions for adding and removing appenders.
Arguments
...
Used internally by lambda.r
Usage
# Get the appender for the given logger
flog.appender(name) %::% character : Function
flog.appender(name='ROOT')
# Set the appender for the given logger
flog.appender(fn, name='ROOT')
# Print log messages to the console appender.console()
# Write log messages to a file appender.file(file)
# Write log messages to console and a file
appender.tee(file)
Details
Appenders do the actual work of writing log messages to
some target. To use an appender in a logger, you must
register it to a given logger. Use flog.appender
to both access and set appenders.
The ROOT logger by default uses appender.console.
appender.console is a function that writes to the
console. No additional arguments are necessary when
registering the appender via flog.appender.
appender.file writes to a file, so you must pass
an additional file argument to the function. To change
the file name, just call
flog.appender(appender.file(file)) again with a
new file name.
To use your own appender create a function that takes a
single argument, which represents the log message. You
need to pass a function reference to
flog.appender.
appender.tee writes to both the console and file.
Value
When getting the appender, flog.appender returns
the appender function. When setting an appender,
flog.appender has no return value.
Author(s)
Brian Lee Yung Rowe
See Also
flog.loggerflog.layout
Examples
## Not run:
flog.appender(appender.console(), name='my.logger')
# Set an appender to the logger named 'my.package'. Any log operations from
# this package will now use this appender.
flog.appender(appender.file('my.package.out'), 'my.package')
## End(Not run)