syntax_check.rake

desc "Checks ruby syntax on all files"
task :syntax_check do
  puts "#{Dir.pwd}"
  current_dir = Dir.pwd
  files = []
  ["app", "config", "lib", "experiments", "spec"].each do |dir|
    files = files + Dir.glob("#{current_dir}/#{dir}/**/*.rb")
  end

  puts "Testing #{files.length} files:"

  success = 0
  failed = 0

  puts "--------"

  files.each do |path|
    out = `ruby -c #{path}`.strip
    if !out.include?("Syntax OK")
      puts "- #{path.remove(current_dir)}: #{out}"
      failed += 1
    else
      success += 1
    end
  end

  puts "--------"
  puts "#{success} Successful, #{failed} Failed"
end

I ran into an issue where I was getting a stack trace way farther down than the actual error with rspec. So, I wrote this thing to syntax check every file that matters in a Rails app. It only prints files that fail, but will give you a total of successful checks.