method_extensions
Adds the following method to the Method/UnboundMethod objects
-
source- finds method source based onsource_locationandRipperparser -
doc- returns the comment preceding method definition -
super- returns method which will be called if givenMethod/UnboundMethodwould callsuper. Chainable. Available only after yourequire "method_extensions/method/super"
And some sugar
-
source_with_doc-source+doc -
full_inspect-inspect+source_location+source_with_doc
Installation
gem install method_extensions
Usage
See how method_extensions can be used to look under the hood of a few Rails 3 core methods at my blog post Travel To The Core Rails 3 Methods Without Leaving IRB Prompt.
> irb
ruby-1.9.2-head > require "method_extensions"
ruby-1.9.2-head > require "fileutils"
ruby-1.9.2-head > puts FileUtils.method(:mkdir).source_with_doc
#
# Options: mode noop verbose
#
# Creates one or more directories.
#
# FileUtils.mkdir 'test'
# FileUtils.mkdir %w( tmp data )
# FileUtils.mkdir 'notexist', :noop => true # Does not really create.
# FileUtils.mkdir 'tmp', :mode => 0700
#
def mkdir(list, options = {})
fu_check_options options, OPT_TABLE['mkdir']
list = fu_list(list)
fu_output_message "mkdir #{options[:mode] ? ('-m %03o ' % options[:mode]) : ''}#{list.join ' '}" if options[:verbose]
return if options[:noop]
list.each do |dir|
fu_mkdir dir, options[:mode]
end
end
ruby-1.9.2-head > eval <<-CODE
class Base
def meth; end
end
class Derived < Base
def meth; end
end
CODE
ruby-1.9.2-head > Derived.instance_method(:meth)
=> #<UnboundMethod: Derived#meth>
ruby-1.9.2-head > Derived.instance_method(:meth).super
=> #<UnboundMethod: Base#meth>