Ruby

#

# logger.error "Argument #{ @foo } mismatch."

#

#

# logger.info('initialize') { "Initializing..." }

#

#

# logger.add(Logger::FATAL) { 'Fatal error!' }

#

# logger.info "Waiting for input from user"

# # ...

# logger.info { "User typed #{input}" }

#

# You'll probably stick to the second form above, unless you want to provide a

# program name (which you can do with <tt>Logger#progname=</tt> as well).

case msg

when ::String

msg

when ::Exception

"#{ msg.message } (#{ msg.class })\n" <<

(msg.backtrace || []).join("\n")