Easily find and view Ruby standard library source code

vsrcrb.rb

#!/usr/bin/env ruby
# vsrcrb.rb by Ryan Kulla (http://rkulla.com).
# Note that it only works on a *nix OS (OSX, Linux, etc). Not Windows.
# Command-line program to output standard library module source
# Install: $ mkdir ~/bin ; mv -i vsrcrb.rb ~/bin/vsrcrb ; chmod u+x ~/bin/vsrcrb
# Usage: $ vsrcrb <module-name-without-extension>
# Example: View socket.rb's source code: $ vsrcrb socket | less
# To view a gem's src: $ less $(gem which <gem>)

def get_source_paths(target_file)
  $LOAD_PATH.each do |dir_path| 
    Dir.chdir(dir_path) do 
      file_path = %x[#{"find `pwd` -iname #{target_file}.rb"}]
      return file_path.split unless file_path == ''
    end
  end
end

def view_source(file_path)
  File.foreach(file_path.chomp) do |line|
    puts line
  end
end

if $0 == __FILE__
  found_paths = get_source_paths(ARGV[0])
  puts 'Found:'
  puts found_paths
  puts
  shortest_path = found_paths.min_by(&:length)
  puts "Opening: #{shortest_path}\n\n"
  40.times { print '=' }
  puts
  view_source(shortest_path)
end