class Terrapin::CommandLine::ProcessRunner

def self.available?
  Process.respond_to?(:spawn)
end

def self.supported?
  available? && !OS.java?
end

def call(command, env = {}, options = {})
  pipe = MultiPipe.new
  pid = spawn(env, command, options.merge(pipe.pipe_options))
  pipe.read_and_then do
    waitpid(pid)
  end
  pipe.output
end

def spawn(*args)
  Process.spawn(*args)
end

def supported?
  self.class.supported?
end

def waitpid(pid)
  Process.waitpid(pid)
rescue Errno::ECHILD
  # In JRuby, waiting on a finished pid raises.
end