all my tools installed on this box?

gistfile1.rb

#!/usr/bin/env ruby
# What's missing from my toolbox?
require "rubygems"

begin
  require "term/ansicolor"
rescue LoadError
  nil
end

class String
  include Term::ANSIColor if defined? Term
  def first_line
    self.split(/\n/).delete_if{|s| s.empty?}.first
  end

  unless defined? Term
    %w[red green].each do |color|
      define_method "#{color}" do self end
    end
  end
end

tools = %w[rvm git brew node vi ruby rails]

tools.each do |tool|
  (!`which #{tool}`.empty?) ? puts((tool + "\t=>\t" + `#{tool} --version`.first_line).green) : puts("#{tool} MISSING".first_line.red)
end

Tell me if there is a better way to optionally require/include a library!