Annotate failing Cucumber scenarios with @broken

annotate-failures.rb

failures = {}
ARGF.read.split(/\n/).each do |line|
  matches = line.match(/\Acucumber ([^:]+):(\d+)/) or next
  (failures[matches[1]] ||= []) << matches[2].to_i - 1
end

failures.each do |file, indices|
  lines = File.readlines(file)
  indices.reverse.each do |index|
    indentation = lines[index][/\A\s+/]
    lines = lines.take(index) + ["#{indentation}@broken\n"] + lines.drop(index)
  end
  File.open(file, 'w') do |io|
    io << lines.join('')
  end
end