module LCSDiff

def diff_lcs_loaded? #:nodoc:

:nodoc:
for diff.
Check if Diff::LCS is loaded. If it is, use it to create pretty output 
def diff_lcs_loaded? #:nodoc:
  return true if defined?(Diff::LCS)
  return @diff_lcs_loaded unless @diff_lcs_loaded.nil?
  @diff_lcs_loaded = begin
    require "diff/lcs"
    true
  rescue LoadError
    false
  end
end

def output_diff_line(diff) #:nodoc:

:nodoc: 
def output_diff_line(diff) #:nodoc:
  case diff.action
  when "-"
    say "- #{diff.old_element.chomp}", :red, true
  when "+"
    say "+ #{diff.new_element.chomp}", :green, true
  when "!"
    say "- #{diff.old_element.chomp}", :red, true
    say "+ #{diff.new_element.chomp}", :green, true
  else
    say "  #{diff.old_element.chomp}", nil, true
  end
end

def show_diff(destination, content) #:nodoc:

:nodoc:
available.
Overwrite show_diff to show diff with colors if Diff::LCS is 
def show_diff(destination, content) #:nodoc:
  if diff_lcs_loaded? && ENV["THOR_DIFF"].nil? && ENV["RAILS_DIFF"].nil?
    actual  = File.binread(destination).to_s.split("\n")
    content = content.to_s.split("\n")
    Diff::LCS.sdiff(actual, content).each do |diff|
      output_diff_line(diff)
    end
  else
    super
  end
end