Adds a spec:lint rake task to detect debugging code in specs, such as logging or rspec tags

spec.rake

require 'English'

FOUND_RESULTS = 0
NO_RESULTS = 1
ERROR = 2

DEBUGGING_CODE = [
  '"puts "',
  '" p "',
  '"focus: true"'
].freeze

def green(str)
  "\e[32m#{str}\e[0m"
end

def red(str)
  "\e[31m#{str}\e[0m"
end

namespace :spec do
  desc 'Lint specs for debugging code'
  task :lint do
    puts 'Linting specs...'

    patterns = "-e #{DEBUGGING_CODE.join(' -e ')}"
    command = "grep -nr #{patterns} spec/**/**/* --color=always"

    output = `#{command}`
    status = $CHILD_STATUS.exitstatus

    if status == FOUND_RESULTS
      puts red("\nFound #{output.split("\n").size} errors:")
      puts output
      puts "\n"

      abort red('Done, with errors')
    elsif status == ERROR
      puts command
      puts output
      puts "\n"

      abort red('Grep error occurred')
    end

    puts green('Done without errors!')
  end
end