Yell - Your Extensible Logging Library
Yell works and is tested with ruby 1.8.7, 1.9.x, jruby 1.8 and 1.9 mode, rubinius 1.8 and 1.9 as well as ree.
gem install yell
Or in your Gemfile:
On the basics, you can use Yell just like any other logging library with a more sophisticated message formatter.
logger = . STDOUT logger.info "Hello World" #=> "2012-02-29T09:30:00+01:00 [ INFO] 65784 : Hello World" # ^ ^ ^ ^ # ISO8601 Timestamp Level Pid Message
The strength of Yell, however, comes when using multiple adapters. The already built-in ones are IO-based and require no further configuration. Also, there are additional ones available as separate gems. Please consult the wiki on that - they are listed there.
The standard adapters are:
:stdout : Messages will be written to STDOUT
:stderr : Messages will be written to STDERR
:file : Messages will be written to a file
:datefile : Messages will be written to a timestamped file
Here are some short examples on how to combine them:
Example: Notice messages go into
STDOUT and error messages into
logger = . do |l| l.adapter STDOUT, :level => [:debug, :info, :warn] l.adapter STDERR, :level => [:error, :fatal] end
Example: Typical production Logger
We setup a logger that starts passing messages at the
:info level. Severities
:error go into the 'production.log', whereas anything higher is written
into the 'error.log'.
logger = . do |l| l.level = :info # will only pass :info and above to the adapters l.adapter :datefile, 'production.log', :level => ..(:warn) l.adapter :datefile, 'error.log', :level => ..(:error) end
You can find further examples and additional adapters in the wiki. or have a look into the examples folder.
Copyright © 2011-2012 Rudolf Schmidt, released under the MIT license