Extracts RSpec failed examples from a CircleCI build so you can run them locally

circleci-to-rspec.rb

require "open-uri"
require "json"

if ARGV.length < 3
  puts "Usage: ruby circle-to-rspec.rb CIRCLE_CI_TOKEN RSPEC_STEP_NAME BUILD_URL"
  puts "You can get your CircleCI token at https://circleci.com/account/api"
  exit(0)
end

circle_token = ARGV[0]
rspec_step_name = ARGV[1]
build_url = ARGV[2]

api_url = build_url.split("?").first.gsub("circleci.com/gh", "circleci.com/api/v1.1/project/github").concat("?circle-token=#{circle_token}")

json = JSON.parse(open(api_url).read)
rspec_step = json["steps"].find {|step| step["name"] == rspec_step_name }

unless rspec_step
  puts "Can't find rspec step with name #{rspec_step_name}"
  exit(1)
end

failures = rspec_step["actions"].flat_map do |action|
  output_url = action["output_url"]
  content = open(output_url).read
  content.split("\\r\\n").select { |line|
    line.include?("rspec ")
  }.map { |line|
    match_data = line.match(/rspec ('?\.\/[^#\\]*)/)
    match_data[1] if match_data
  }.compact
end

puts failures.join(" ").prepend("rspec ")