class RSpec::Support::HunkGenerator

def actual_lines
  @actual.split("\n").map! { |e| e.chomp }
end

def build_hunk(piece)
  Diff::LCS::Hunk.new(
    expected_lines, actual_lines, piece, context_lines, @file_length_difference
  ).tap do |h|
    @file_length_difference = h.file_length_difference
  end
end

def context_lines
  3
end

def diffs
  Diff::LCS.diff(expected_lines, actual_lines)
end

def expected_lines
  @expected.split("\n").map! { |e| e.chomp }
end

def hunks
  @file_length_difference = 0
  @hunks ||= diffs.map do |piece|
    build_hunk(piece)
  end
end

def initialize(actual, expected)
  @actual = actual
  @expected = expected
end