module RSpec::Support::ShellOut

def filter(output)
  output.each_line.reject do |line|
    line.include?("lib/ruby/shared/rubygems")
  end.join($/)
end

def filter(output)
  output
end

def run_ruby_with_current_load_path(ruby_command, *flags)
  command = [
    FileUtils::RUBY,
    "-I#{$LOAD_PATH.map(&:shellescape).join(File::PATH_SEPARATOR)}",
    "-e", ruby_command, *flags
  ]
  # Unset these env vars because `ruby -w` will issue warnings whenever
  # they are set to non-default values.
  with_env 'RUBY_GC_HEAP_FREE_SLOTS' => nil, 'RUBY_GC_MALLOC_LIMIT' => nil,
           'RUBY_FREE_MIN' => nil do
    shell_out(*command)
  end
end

def shell_out(*command)
  stdout, stderr, status = Open3.capture3(*command)
  return stdout, filter(stderr), status
end

def shell_out(*command)
  stdout = stderr = nil
  Open3.popen3(*command) do |_in, out, err|
    stdout = out.read
    stderr = err.read
  end
  status = FakeProcessStatus.new(0)
  return stdout, filter(stderr), status
end

def strip_known_warnings(input)
  input.split("\n").reject do |l|
    LINES_TO_IGNORE.any? { |to_ignore| l =~ to_ignore } ||
    # Remove blank lines
    l == "" || l.nil?
  end.join("\n")
end

def with_env(vars)
  original = ENV.to_hash
  vars.each { |k, v| ENV[k] = v }
  begin
    yield
  ensure
    ENV.replace(original)
  end
end