FindBreaks - find and list all spec files that broke due to your world-changing one-liner just now.

findbreaks.rb

#!/usr/bin/env ruby

# findbreaks 0.9
# Script to find all spec files in an `rspec` run that report errors and produce
# a list of all failed spec filenames, with each such listed once. Useful if you
# have numerous specs that break due to a world-changing edit you've just made,
# and you want a nice list of the broken specs without having to read through
# hundreds of lines of RSpec bleeding on your terminal. Pick one; fix it; run
# this again; repeat.
#
# Written 27 May 2013 by jdickey at seven-sigma dot com and released under the
# MIT license. Forks and bug reports welcome.

def findbreaks
  tmpf = "/tmp/breaks#{rand 1000}"
  system 'rspec --no-colour >' + tmpf
  lines = []
  File.open(tmpf, 'r') do |file|
    while line = file.gets
      lines << line
    end
  end
  File.unlink tmpf
  lines.
    drop_while {|line| !line.match /Failed examples:/}.
    reject{|line| !line.match /\Arspec \./}.
    collect{|line| line.match(/rspec (.+?)\:\d+? /)[1]}.
    uniq.
    sort
end

unless ARGV.nil?
  puts findbreaks
end