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module LCSDiff
protected
# Overwrite show_diff to show diff with colors if Diff::LCS is
# available.
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
private
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
# Check if Diff::LCS is loaded. If it is, use it to create pretty output
# for diff.
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
end
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