differ.rb

# Very simple Ruby diff for strings.
# It works only on strings with the same number of lines, but it was perfect
# for my usecase where I was modifying templates saved in the database and I
# wanted to be sure that I am changing only what needs to be changed.

def differ(str_a, str_b)
  str_a.lines.zip(str_b.lines) do |line_a, line_b|
    if line_a != line_b
      puts "< #{line_a}"
      puts "> #{line_b}"
    end
  end
end

# example output
# < {{ order.item_name }}                            {{ order.total }}
# > {{ order.item_name }}                            {{ order.item_price }}