class MiniMagick::Shell

def execute(command, stdin: "", timeout: MiniMagick.timeout)
  env = MiniMagick.restricted_env ? ENV.to_h.slice("HOME", "PATH", "LANG") : {} # Using #to_h for Ruby 2.5 compatibility.
  env.merge!(MiniMagick.cli_env)
  env["MAGICK_TIME_LIMIT"] = timeout.to_s if timeout
  stdout, stderr, status = log(command.join(" ")) do
    Open3.capture3(env, *command, stdin_data: stdin, unsetenv_others: MiniMagick.restricted_env)
  end
  [stdout, stderr, status&.exitstatus]
rescue Errno::ENOENT, IOError
  ["", "executable not found: \"#{command.first}\"", 127]
end

def log(command, &block)
  time_start = Process.clock_gettime(Process::CLOCK_MONOTONIC)
  value = block.call
  duration = Process.clock_gettime(Process::CLOCK_MONOTONIC) - time_start
  MiniMagick.logger.debug "[%.2fs] %s" % [duration, command]
  value
end

def run(command, errors: MiniMagick.errors, warnings: MiniMagick.warnings, **options)
  stdout, stderr, status = execute(command, **options)
  if status != 0
    if stderr.include?("time limit exceeded")
      fail MiniMagick::TimeoutError, "`#{command.join(" ")}` has timed out"
    elsif errors
      fail MiniMagick::Error, "`#{command.join(" ")}` failed with status: #{status.inspect} and error:\n#{stderr}"
    end
  end
  $stderr.print(stderr) if warnings
  [stdout, stderr, status]
end